SI5335B-B07735-GM

Si5335 W EB -C USTOMIZABLE , A NY - F REQUENCY, A NY - O U TP U T Q UAD C LOCK G ENERATOR /B U FF E R Features LVPECL/LVDS/CML: 1 to 350 MHz 1 to 250 MHz 1 to 200 MHz SSTL/HSTL: 1 to 350 MHz    HCSL: 45 CMOS: 12  mA (PLL mode) mA (Buffer mode) Wide temperature range: –40 to +85 °C Applications 24 Top View P2 Independently configurable outputs support any frequency or format: Pin Assignments VDDO0    23 22 21 20 19 XA/CLKIN 1 18 CLK1A XB/CLKINB 2 17 CLK1B P3 3 GND 4 Processor and FPGA clocking MSAN/DSLAM/PON Fibre Channel, SAN Telecom line cards 1 GbE and 10 GbE P5 15 VDDO2 5 14 CLK2A P6 6 13 CLK2B 7 8 9 CLK3B      VDD Ethernet switch/router PCI Express Gen 1/2/3/4 PCIe jitter attenuation DSL jitter attenuation Broadcast video/audio timing LOS      16 VDDO1 GND GND Pad 10 11 12 P1 crystal: 25 or 27 MHz input: 10 to 200 MHz SSTL/HSTL input: 10 to 350 MHz Differential input: 10 to 350 MHz CMOS CLK0B External CLK3A   Ordering Information: See page 41. VDDO3  RSVD_GND  Independent output voltage per driver: 1.5, 1.8, 2.5, or 3.3 V Single supply core with excellent PSRR: 1.8, 2.5, 3.3 V Up to five user-assignable pin functions simplify system design: SSENB (spread spectrum control), RESET, Master OEB or OEB per pin, and Frequency plan select (FS1, FS0) Loss of signal alarm PCIe Gen 1/2/3/4 common clock compliant PCIe Gen 3 SRNS Compliant Two selectable loop bandwidth settings: 1.6 MHz or 475 kHz Easy to customize with web-based utility Small size: 4 x 4 mm, 24-QFN Low power (core): CLK0A   Low power MultiSynth™ technology enables independent, any-frequency synthesis of four frequencies  Configurable as a clock generator or clock buffer device  Three independent, user-assignable, pinselectable device configurations Highly-configurable output drivers with up to four differential outputs, eight single-ended clock outputs, or a combination of both  Low phase jitter of 0.7 ps RMS  Flexible input reference: VDD  Description The Si5335 is a highly flexible clock generator capable of synthesizing four completely non-integer-related frequencies up to 350 MHz. The device has four banks of outputs with each bank supporting one differential pair or two single-ended outputs. Using Silicon Laboratories' patented MultiSynth fractional divider technology, all outputs are guaranteed to have 0 ppm frequency synthesis error regardless of configuration, enabling the replacement of multiple clock ICs and crystal oscillators with a single device. The Si5335 supports up to three independent, pin-selectable device configurations, enabling one device to replace three separate clock generators or buffer ICs. To ease system design, up to five user-assignable and pin-selectable control pins are provided, supporting PCIe-compliant spread spectrum control, master and/or individual output enables, frequency plan selection, and device reset. Two selectable PLL loop bandwidths support jitter attenuation in applications, such as PCIe and DSL. Through its flexible ClockBuilder™ (www.silabs.com/ClockBuilder) web configuration utility, factory-customized, pin-controlled devices are available in two weeks without minimum order quantity restrictions. Measuring PCIe clock jitter is quick and easy with the Silicon Labs PCIe Clock Jitter Tool. Download it for free at www.silabs.com/pcie-learningcenter. Rev. 1.4 12/15 Copyright © 2015 by Silicon Laboratories Si5335 Si5335 Functional Block Diagram Osc VDDO0 PLL Bypass CLK0A ÷MultiSynth0 XA / CLKIN XB / CLKINB CLK0B PLL PLL Bypass OEB0 CLKIN VDDO1 CLK1A ÷MultiSynth1 CLK1B P1 P2 P3 P5 P6 Programmable Pin Function Options: PLL Bypass OEB1 VDDO2 CLK2A ÷MultiSynth2 OEB0/1/2/3 OEB_all SSENB FS[1:0] RESET Control PLL Bypass CLK2B OEB2 VDDO3 CLK3A ÷MultiSynth3 CLK3B LOS 2 OEB3 Rev. 1.4 Si5335 TABLE O F C ONTENTS Section Page 1. Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2. Typical PCIe System Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 3. Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 3.1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 3.2. MultiSynth Technology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 3.3. ClockBuilder Web-Customization Utility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 3.4. Input Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 3.5. Input and Output Frequency Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 3.6. Multi-Function Control Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 3.7. Output Enable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 3.8. Frequency Select/Device Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 3.9. Loss-of-Signal Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 3.10. Output Stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 4. Power Consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 5. Spread Spectrum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 6. Jitter Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 7. Power Supply Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 8. Loop Bandwidth Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 9. Applications of the Si5335 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 9.1. Free-Running Clock Generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 9.2. Synchronous Frequency Translation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 9.3. Configurable Universal Buffer and Level Translator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 10. Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 11. Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 12. Package Outline: 24-Lead QFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 13. Recommended PCB Land Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 14. Top Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 14.1. Si5335 Top Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 14.2. Top Marking Explanation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 15. Device Errata . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 Document Change List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 Rev. 1.4 3 Si5335 1. Electrical Specifications Table 1. Recommended Operating Conditions (VDD = 1.8 V –5% to +10%, 2.5 V ±10%, or 3.3 V ±10%, TA = –40 to 85 °C) Parameter Symbol Ambient Temperature Core Supply Voltage Output Buffer Supply Voltage Test Condition TA VDD VDDOn Min Typ Max Unit –40 25 85 °C 2.97 3.3 3.63 V 2.25 2.5 2.75 V 1.71 1.8 1.98 V 1.4 — 3.63 V Note: All minimum and maximum specifications are guaranteed and apply across the recommended operating conditions. Typical values apply at nominal supply voltages and an operating temperature of 25 °C unless otherwise noted. Table 2. DC Characteristics (VDD = 1.8 V –5% to +10%, 2.5 V ±10%, or 3.3 V ±10%, TA = –40 to 85 °C) Parameter Core Supply Current (Clock Generator Mode) Core Supply Current (Buffer Mode) Output Buffer Supply Current Symbol Test Condition Min Typ Max Unit IDDCG 100 MHz on all outputs, 25 MHz refclk, clock generator mode — 45 60 mA IDDB 50 MHz refclk — 12 — mA LVPECL, 350 MHz — — 30 mA CML, 350 MHz — 12 — mA LVDS, 350 MHz — — 8 mA HCSL, 250 MHz 2 pF load — — 20 mA SSTL, 350 MHz — — 19 mA CMOS, 50 MHz 15 pF load1 — 6 9 mA CMOS, 200 MHz1,2 3.3 V VDD0 — 13 18 mA CMOS, 200 MHz1,2 2.5 V — 10 14 mA CMOS, 200 MHz1,2 1.8 V — 7 10 mA HSTL, 350 MHz — — 19 mA IDDOx Notes: 1. Single CMOS driver active. 2. Measured into a 5” 50  trace with 2 pF load. 4 Rev. 1.4 Si5335 Table 3. Performance Characteristics (VDD = 1.8 V –5% to +10%, 2.5 V ±10%, or 3.3 V ±10%, TA = –40 to 85 °C) Parameter Symbol Test Condition Min Typ Max Unit PLL Acquisition Time tACQ 1.6 MHz loop bandwidth — — 25 ms PLL Tracking Range fTRACK 475 kHz or 1.6 MHz loop bandwidth 5000 20000 — ppm fBW1 High bandwidth option — 1.6 — MHz fBW2 Low bandwidth option — 475 — kHz MultiSynth Frequency Synthesis Resolution fRES Output frequency < Fvco/8 0 0 1 ppb CLKIN Loss of Signal Detect Time tLOS — 2.6 5 µs tLOSRLS 0.01 0.2 1 µs POR to Output Clock Valid tRDY — — 2 ms Input-to-Output Propagation Delay tPROP — 2.5 4 ns Reset Minimum Pulse Width tRESET — — 200 ns Output-Output Skew1 tDSKEW FOUT > 5 MHz — — 100 ps Spread Spectrum PP Frequency Deviation2 SSDEV FOUT = 100 MHz — –0.45 –0.5 % Spread Spectrum Modulation Rate3 SSDEV FOUT = 100 MHz 30 31.5 33 kHz PLL Loop Bandwidth CLKIN Loss of Signal Release Time Buffer Mode (PLL Bypass) Notes: 1. Outputs at integer-related frequencies and using the same driver format. 2. Default value is 0.5% down spread. 3. Default value is 31.5 kHz for PCI compliance. Rev. 1.4 5 Si5335 Table 4. Input and Output Clock Characteristics (VDD = 1.8 V –5% to +10%, 2.5 V ±10%, or 3.3 V ±10%, TA = –40 to 85 °C) Parameter Symbol Test Condition Min Typ Max Unit Input Clock (AC Coupled Differential Input Clocks on Pins 1 and 2)1 fIN LVDS, LVPECL, HCSL, CML 102 — 350 Differential Voltage Swing VPP 350 MHz input 0.4 — 2.4 Rise/Fall Time3 tR/tF 20%–80% — — 1.0 ns DC (PLL mode) < 1 ns tR/tF 40 — 60 % DC (PLL bypass mode) < 1 ns tR/tF 45 — 55 % Frequency Duty Cycle3 MHz VPP Input Impedance1 RIN 10 — — k Input Capacitance CIN — 3.5 — pF Input Clock (AC-Coupled Single-Ended Input Clock on Pin 1) Frequency fIN CMOS, HSTL, SSTL 102 — 200 MHz CMOS Input Voltage Swing VI 200 MHz 0.8 — 1.2 Vpp CMOS Rise/Fall Time tR/tF 10%–90% — — 4 ns CMOS Rise/Fall Time tR/tF 20%–80% — — 2.3 ns VI(HSTL/ 200 MHz 0.4 — 1.2 VPP 10%–90% — — 1.4 ns HSTL/SSTL Input Voltage HSTL/SSTL Rise/Fall Time SSTL) tR/tF Notes: 1. Use an external 100  resistor to provide load termination for a differential clock. See "3.4.2. Differential Input Clocks" on page 19. 2. Minimum input frequency in clock buffer mode (PLL bypass) is 5 MHz. Operation to 1 MHz is also supported in buffer mode, but loss-of-signal (LOS) status is not functional. 3. Applies to differential inputs. For best jitter performance, keep the midpoint peak-to-peak differential input slew rate on pins 1 and 2 faster than 0.3 V/ns. 4. CML output format requires ac-coupling of the differential outputs to a differential 100  load at the receiver. See "3.10.6. CML Outputs" on page 31. 5. Includes effect of internal series 22  resistor. 6 Rev. 1.4 Si5335 Table 4. Input and Output Clock Characteristics (Continued) (VDD = 1.8 V –5% to +10%, 2.5 V ±10%, or 3.3 V ±10%, TA = –40 to 85 °C) Parameter Duty Cycle Input Capacitance Symbol Test Condition Min Typ Max Unit DC (PLL mode) < 1 ns tR/tF 40 — 60 % DC (PLL bypass mode) < 1 ns tR/tF 45 — 55 % — 3.5 — pF LVPECL, LVDS, CML 1 — 350 MHz HCSL 1 — 250 MHz VOC common mode — VDDO– 1.45 V — V VSEPP peak-to-peak singleended swing 0.55 0.8 0.96 VPP VOC common mode 1.125 1.2 1.275 V VSEPP peak-to-peak singleended swing 0.25 0.35 0.45 VPP VOC common mode 0.8 0.875 0.95 V VSEPP peak-to-peak singleended swing 0.25 0.35 0.45 VPP VOC common mode 0.35 0.375 0.400 V VSEPP peak-to-peak singleended swing 0.575 0.725 0.85 VPP VOC Common Mode — See Note 4 — V VSEPP Peak-to-Peak Singleended Swing 0.67 0.860 1.07 VPP tR/tF 20% to 80% LVPECL, LVDS, HCSL, CML — — 450 ps CIN Output Clocks (Differential) Frequency LVPECL Output Voltage LVDS Output Voltage (2.5/3.3 V) LVDS Output Voltage (1.8 V) HCSL Output Voltage CML Output Voltage Rise/Fall Time fOUT Notes: 1. Use an external 100  resistor to provide load termination for a differential clock. See "3.4.2. Differential Input Clocks" on page 19. 2. Minimum input frequency in clock buffer mode (PLL bypass) is 5 MHz. Operation to 1 MHz is also supported in buffer mode, but loss-of-signal (LOS) status is not functional. 3. Applies to differential inputs. For best jitter performance, keep the midpoint peak-to-peak differential input slew rate on pins 1 and 2 faster than 0.3 V/ns. 4. CML output format requires ac-coupling of the differential outputs to a differential 100  load at the receiver. See "3.10.6. CML Outputs" on page 31. 5. Includes effect of internal series 22  resistor. Rev. 1.4 7 Si5335 Table 4. Input and Output Clock Characteristics (Continued) (VDD = 1.8 V –5% to +10%, 2.5 V ±10%, or 3.3 V ±10%, TA = –40 to 85 °C) Parameter Duty Cycle Symbol Test Condition Min Typ Max Unit DC LVPECL, LVDS, HCSL, CML 45 — 55 % CMOS 1 — 200 MHz SSTL, HSTL 1 — 350 MHz Output Clocks (Single-Ended) Frequency fOUT CMOS 20%–80% Rise/Fall Time tR/tF 2 pF load — 0.45 0.85 ns CMOS 20%–80% Rise/Fall Time tR/tF 15 pF load — — 2.0 ns VOH 4 mA load VDDO – 0.3 — VOL 4 mA load CMOS Output Voltage5 — 0.3 V — 50 —  — 0.35 — ns 0.5xVDDO+0.3 — — V — — 0.5xVDDO –0.3 V SSTL-3 VDDOx = 2.97 to 3.63 V 0.45xVDDO+0.41 — — V — — 0.45xVDDO–0.41 V SSTL-2 VDDOx = 2.25 to 2.75 V 0.5xVDDO+0.41 — — V — — 0.5xVDDO–0.41 V SSTL-18 VDDOx = 1.71 to 1.98 V 0.5xVDDO+0.34 — — — 0.5xVDDO–0.34 V — 50 —  45 — 55 % CMOS Output Resistance5 HSTL, SSTL 20%–80% Rise/Fall Time HSTL Output Voltage tR/tF VOH VOL VOH VOL SSTL Output Voltage VOH VOL VOH VOL See Figure 16. VDDO = 1.4 to 1.6 V HSTL, SSTL Output Resistance Duty Cycle V DC V Notes: 1. Use an external 100  resistor to provide load termination for a differential clock. See "3.4.2. Differential Input Clocks" on page 19. 2. Minimum input frequency in clock buffer mode (PLL bypass) is 5 MHz. Operation to 1 MHz is also supported in buffer mode, but loss-of-signal (LOS) status is not functional. 3. Applies to differential inputs. For best jitter performance, keep the midpoint peak-to-peak differential input slew rate on pins 1 and 2 faster than 0.3 V/ns. 4. CML output format requires ac-coupling of the differential outputs to a differential 100  load at the receiver. See "3.10.6. CML Outputs" on page 31. 5. Includes effect of internal series 22  resistor. 8 Rev. 1.4 Si5335 Table 5. Control Pins* (VDD = 1.8 V –5% to +10%, 2.5 V ±10%, or 3.3 V ±10%, TA = –40 to 85 °C) Parameter Symbol Condition Min Typ Max Unit Pins P1, P2, P3 –0.1 — 0.3 x VDD V Pins P5 and P6 — — 0.3 V Pins P1, P2, P3 0.7 x VDD — 3.73 V Pins P5* and P6* 0.85 — 1.2 V Input Control Pins (P1, P2, P3, P5*, P6*) Input Voltage Low VIL Input Voltage High VIH Input Capacitance CIN — — 4 pF Input Resistance RIN — 20 — k Output Control Pins (LOS, Pin 8) Output Voltage Low VOL ISINK = 3 mA 0 — 0.4 V Rise/Fall Time 20–80% tR/tF CL < 10 pf, pull up  1 k — — 10 ns *Note: For more information, see "3.6.1. P5 and P6 Input Control" on page 24. Table 6. Crystal Specifications for 25 MHz Parameter Symbol Min Typ Max Unit fXTAL — 25 — MHz Load Capacitance (on-chip differential) cL — 18 — pF Crystal Output Capacitance cO — — 5 pF rESR — — 100  dL 100 — — µW Symbol Min Typ Max Unit fXTAL — 27 — MHz Load Capacitance (on-chip differential) cL — 18 — pF Crystal Output Capacitance cO — — 5 pF rESR — — 75  dL 100 — — µW Crystal Frequency Equivalent Series Resistance Crystal Max Drive Level Table 7. Crystal Specifications for 27 MHz Parameter Crystal Frequency Equivalent Series Resistance Crystal Max Drive Level Rev. 1.4 9 Si5335 Table 8. Jitter Specifications, Clock Generator Mode (Loop Bandwidth = 1.6 MHz)1,2,3 (VDD = 1.8 V –5% to +10%, 2.5 V ±10%, or 3.3 V ±10%, TA = –40 to 85 °C) Parameter Symbol Test Condition Min Typ Max Unit GbE Random Jitter (12 kHz–20 MHz)4 JGbE CLKIN = 25 MHz All CLKn at 125 MHz5 — 0.7 1 ps RMS GbE Random Jitter (1.875–20 MHz) RJGbE CLKIN = 25 MHz All CLKn at 125 MHz5 — 0.38 0.79 ps RMS OC-12 Random Jitter (12 kHz–5 MHz) JOC12 CLKIN = 19.44 MHz All CLKn at 155.52 MHz5 — 0.7 1 ps RMS Total Jitter6 — 20.1 33.6 ps pk-pk RMS Jitter6, 10 kHz to 1.5 MHz — 0.15 1.47 ps RMS RMS Jitter6, 1.5 MHz to 50 MHz — 0.58 0.75 ps RMS RMS Jitter6 — 0.15 0.45 ps RMS PCIe Gen 3 Separate Reference No Spread, SRNS PLL BW of 2–4 or 2–5 MHz, CDR = 10 MHz — 0.11 0.32 ps RMS PCIe Gen 4, Common Clock PLL BW of 2–4 or 2–5 MHz, CDR = 10 MHz — 0.15 0.45 ps RMS — 10 30 ps pk-pk PCI Express 1.1 Common Clocked (with spread spectrum) PCI Express 2.1 Common Clocked (no spread spectrum) PCI Express 3.0 Common Clocked (no spread spectrum) Period Jitter JPER N = 10,000 cycles7 Notes: 1. All jitter measurements apply for LVDS/HCSL/LVPECL/CML output format with a low noise differential input clock and are made with an Agilent 90804 oscilloscope. All RJ measurements use RJ/DJ separation. 2. All jitter data in this table is based upon all output formats being differential. When single-ended outputs are used, there is the potential that the output jitter may increase due to the nature of single-ended outputs. If your configuration implements any single-ended output and any output is required to have jitter less than 2 ps rms, contact Silicon Labs for support to validate your configuration and ensure the best jitter performance. In many configurations, CMOS outputs have little to no effect upon jitter. 3. For best jitter performance, keep the single-ended clock input slew rates at pins 1 and 2 greater that 1.0 V/ns and the differential clock input slew rates greater than 0.3 V/ns. 4. DJ for PCI and GbE is < 5 ps pp 5. Output MultiSynth in Integer mode. 6. All output clocks 100 MHz HCSL format. Jitter is from the PCIE jitter filter combination that produces the highest jitter. See AN562 for details. Jitter is mesured with the Intel Clock Jitter Tool, Ver.1.6.4. 7. For any output frequency > 10 MHz. 8. Measured in accordance with JEDEC standard 65. 9. Rj is multiplied by 14; estimate the pp jitter from Rj over 212 rising edges. 10. Gen 4 specifications based on the PCI-Express Base Specification 4.0 rev. 0.5. 11. Download the Silicon Labs PCIe Clock Jitter Tool at www.silabs.com/pcie-learningcenter. 10 Rev. 1.4 Si5335 Table 8. Jitter Specifications, Clock Generator Mode (Loop Bandwidth = 1.6 MHz)1,2,3 (Continued) (VDD = 1.8 V –5% to +10%, 2.5 V ±10%, or 3.3 V ±10%, TA = –40 to 85 °C) Parameter Symbol Test Condition Min Typ Max Unit — 9 29 ps pk8 — 0.7 1.5 ps RMS — 3 15 ps pk-pk — 2 10 ps pk-pk Output MultiSynth operated in fractional mode7 — 13 36 ps pk-pk Output MultiSynth operated in integer mode7 — 12 20 ps pk-pk Cycle-Cycle Jitter JCC N = 10,000 cycles Output MultiSynth operated in integer or fractional mode7 Random Jitter (12 kHz–20 MHz) RJ Output and feedback MultiSynth in integer or fractional mode7 Output MultiSynth operated in fractional Deterministic Jitter DJ mode7 Output MultiSynth operated in integer mode7 Total Jitter (12 kHz–20 MHz) TJ = DJ+14xRJ (See Note 9) Notes: 1. All jitter measurements apply for LVDS/HCSL/LVPECL/CML output format with a low noise differential input clock and are made with an Agilent 90804 oscilloscope. All RJ measurements use RJ/DJ separation. 2. All jitter data in this table is based upon all output formats being differential. When single-ended outputs are used, there is the potential that the output jitter may increase due to the nature of single-ended outputs. If your configuration implements any single-ended output and any output is required to have jitter less than 2 ps rms, contact Silicon Labs for support to validate your configuration and ensure the best jitter performance. In many configurations, CMOS outputs have little to no effect upon jitter. 3. For best jitter performance, keep the single-ended clock input slew rates at pins 1 and 2 greater that 1.0 V/ns and the differential clock input slew rates greater than 0.3 V/ns. 4. DJ for PCI and GbE is < 5 ps pp 5. Output MultiSynth in Integer mode. 6. All output clocks 100 MHz HCSL format. Jitter is from the PCIE jitter filter combination that produces the highest jitter. See AN562 for details. Jitter is mesured with the Intel Clock Jitter Tool, Ver.1.6.4. 7. For any output frequency > 10 MHz. 8. Measured in accordance with JEDEC standard 65. 9. Rj is multiplied by 14; estimate the pp jitter from Rj over 212 rising edges. 10. Gen 4 specifications based on the PCI-Express Base Specification 4.0 rev. 0.5. 11. Download the Silicon Labs PCIe Clock Jitter Tool at www.silabs.com/pcie-learningcenter. Rev. 1.4 11 Si5335 Table 9. Jitter Specifications, Clock Generator Mode (Loop Bandwidth = 475 kHz)1,2 (VDD = 1.8 V –5% to +10%, 2.5 V ±10%, or 3.3 V ±10%, TA = –40 to 85 °C) Parameter Symbol DSL Random Jitter (10 kHz–400 kHz) RJDSL1 DSL Random Jitter (100 kHz–10 MHz) DSL Random Jitter (10 Hz–30 MHz) Min Typ Max Unit CLKIN = 70.656 MHz All CLKn at 70.656 MHz4 — 0.8 2 ps RMS RJDSL2 CLKIN = 70.656 MHz All CLKn at 70.656 MHz4 — 0.9 2 ps RMS RJDSL3 CLKIN = 70.656 MHz All CLKn at 70.656 MHz4 — 1.95 2.2 ps RMS Total Jitter5 — 20 34 ps pk-pk RMS Jitter5, 10 kHz to 1.5 MHz — 0.3 0.5 ps RMS RMS Jitter5, 1.5 MHz to 50 MHz — 0.5 1.0 ps RMS PCI Express 3.0 Common Clocked (no spread spectrum) RMS Jitter5 — 0.15 0.45 ps RMS PCIe Gen 3 Separate Reference No Spread, SRNS PLL BW of 2–4 or 2–5 MHz, CDR = 10 MHz — 0.11 0.32 ps RMS PCIe Gen 4, Common Clock PLL BW of 2–4 or 2–5 MHz, CDR = 10 MHz — 0.15 0.45 ps RMS — 10 30 ps pk-pk PCI Express 1.1 Common Clocked (with spread spectrum) PCI Express 2.1 Common Clocked (no spread spectrum) Period Jitter JPER Test Condition N = 10,000 cycles6 Notes: 1. All jitter measurements apply for LVDS/HCSL/LVPECL/CML output format with a low noise differential input clock and are made with an Agilent 90804 oscilloscope. All RJ measurements use RJ/DJ separation. 2. All jitter data in this table is based upon all output formats being differential. When single-ended outputs are used, there is the potential that the output jitter may increase due to the nature of single-ended outputs. If your configuration implements any single-ended output and any output is required to have jitter less than 2 ps rms, contact Silicon Labs for support to validate your configuration and ensure the best jitter performance. In many configurations, CMOS outputs have little to no effect upon jitter. 3. DJ for PCI and GbE is < 5 ps pp 4. Output MultiSynth in Integer mode. 5. All output clocks 100 MHz HCSL format. Jitter is from the PCIE jitter filter combination that produces the highest jitter. See AN562 for details. Jitter is mesured with the Intel Clock Jitter Tool, Ver.1.6.4. 6. For any output frequency > 5 MHz. 7. Measured in accordance with JEDEC standard 65. 8. Rj is multiplied by 14; estimate the pp jitter from Rj over 212 rising edges. 9. Gen 4 specifications based on the PCI-Express Base Specification 4.0 rev. 0.5. 10. Download the Silicon Labs PCIe Clock Jitter Tool at www.silabs.com/pcie-learningcenter. 12 Rev. 1.4 Si5335 Table 9. Jitter Specifications, Clock Generator Mode (Loop Bandwidth = 475 kHz)1,2 (Continued) (VDD = 1.8 V –5% to +10%, 2.5 V ±10%, or 3.3 V ±10%, TA = –40 to 85 °C) Parameter Symbol Test Condition Min Typ Max Unit — 9 29 ps pk7 — 1 2.5 ps RMS — 3 15 ps pk-pk — 2 10 ps pk-pk Output MultiSynth operated in fractional mode6 — 13 36 ps pk-pk Output MultiSynth operated in integer mode6 — 15 30 ps pk-pk Cycle-Cycle Jitter JCC N = 10,000 cycles Output MultiSynth operated in integer or fractional mode6 Random Jitter (12 kHz–20 MHz) RJ Output and feedback MultiSynth in integer or fractional mode6 Output MultiSynth operated in fractional 6 Deterministic Jitter DJ mode Output MultiSynth operated in integer 6 mode Total Jitter (12 kHz–20 MHz) TJ = DJ+14xRJ (See Note 8) Notes: 1. All jitter measurements apply for LVDS/HCSL/LVPECL/CML output format with a low noise differential input clock and are made with an Agilent 90804 oscilloscope. All RJ measurements use RJ/DJ separation. 2. All jitter data in this table is based upon all output formats being differential. When single-ended outputs are used, there is the potential that the output jitter may increase due to the nature of single-ended outputs. If your configuration implements any single-ended output and any output is required to have jitter less than 2 ps rms, contact Silicon Labs for support to validate your configuration and ensure the best jitter performance. In many configurations, CMOS outputs have little to no effect upon jitter. 3. DJ for PCI and GbE is < 5 ps pp 4. Output MultiSynth in Integer mode. 5. All output clocks 100 MHz HCSL format. Jitter is from the PCIE jitter filter combination that produces the highest jitter. See AN562 for details. Jitter is mesured with the Intel Clock Jitter Tool, Ver.1.6.4. 6. For any output frequency > 5 MHz. 7. Measured in accordance with JEDEC standard 65. 8. Rj is multiplied by 14; estimate the pp jitter from Rj over 212 rising edges. 9. Gen 4 specifications based on the PCI-Express Base Specification 4.0 rev. 0.5. 10. Download the Silicon Labs PCIe Clock Jitter Tool at www.silabs.com/pcie-learningcenter. Rev. 1.4 13 Si5335 Table 10. itter Specifications, Clock Buffer Mode (PLL Bypass)* (VDD = 1.8 V –5% to +10%, 2.5 V ±10%, or 3.3 V ±10%, TA = –40 to 85°C) Parameter Symbol Test Condition Min Typ Max Unit Additive Phase Jitter (12 kHz–20 MHz) tRPHASE 0.7 V pk-pk differential input clock at 350 MHz with 70 ps rise/fall time — 0.165 — ps RMS 0.7 V pk-pk differential input clock at 350 MHz with tRPHASEWB 70 ps rise/fall time — 0.225 — ps RMS Additive Phase Jitter (50 kHz–80 MHz) *Note: All outputs are in Clock Buffer mode (PLL Bypass). Table 11. Typical Phase Noise Performance Offset Frequency 100 Hz 1 kHz 10 kHz 100 kHz 1 MHz 10 MHz Loop Bandwidth 25 MHz XTAL to 156.25 MHz 27 MHz Ref In 19.44 MHz Ref In to 148.3517 MHz to 155.52 MHz 100 MHz Ref In to 100 MHz Units 1.6 MHz –90 –87 –110 –115 dBc/Hz 475 kHz N/A* –91 –91 –113 dBc/Hz 1.6 MHz –120 –117 –116 –122 dBc/Hz 475 kHz N/A* –112 –111 –122 dBc/Hz 1.6 MHz –126 –123 –123 –128 dBc/Hz 475 kHz N/A* –124 –122 –127 dBc/Hz 1.6 MHz –132 –130 –128 –136 dBc/Hz 475 kHz N/A* –122 –121 –124 dBc/Hz 1.6 MHz –132 –132 –128 –136 dBc/Hz 475 kHz N/A* –133 –131 –135 dBc/Hz 1.6 MHz –145 –145 –145 –152 dBc/Hz 475 kHz N/A* –152 –153 –152 dBc/Hz *Note: XTAL input mode does not support the 475 kHz loop bandwidth setting. Table 12. Thermal Characteristics Parameter Symbol Test Condition Value Unit Thermal Resistance Junction to Ambient JA Still Air 37 °C/W Thermal Resistance Junction to Case JC Still Air 25 °C/W 14 Rev. 1.4 Si5335 Table 13. Absolute Maximum Ratings1 Parameter Symbol DC Supply Voltage VDD Input Voltage VIN Storage Temperature Range Test Condition Value Unit –0.5 to 3.8 V Pins: XA/CLKIN, XB/CLKINB, P5, P6 –0.5 to 1.3 V Pins: P1, P2, P3 –0.5 to 3.8 V –55 to 150 °C TSTG ESD Tolerance HBM (100 pF, 1.5 k) 2.5 kV ESD Tolerance CDM 550 V ESD Tolerance MM 175 V Latch-up Tolerance Junction Temperature JESD78 Compliant TJ Peak Soldering Reflow Temperature2 150 °C 260 °C Notes: 1. Permanent device damage may occur if the absolute maximum ratings are exceeded. Functional operation should be restricted to the conditions as specified in the operational sections of this data sheet. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. 2. Refer to JEDEC J-STD-020 standard for more information. Rev. 1.4 15 Si5335 2. Typical PCIe System Diagram Peripheral Board Main Board PCIe Core FPGA A PCIe Core PCIe Link Backplane PCIe Link PCIe Switch 125MHz LVDS Si5335 Clock Generator 100MHz HCSL PCIe Link 25MHz LVPECL FPGA B FPGA C PCIe Core 25MHz LVPECL Peripheral Board Figure 1. PCI Express Switching Application Example Figure 1 shows the Si5335 in a PCI Express application using the common clock topology. The Si5335 provides reference clocks to the three FPGAs, each of which requires a different clock signaling format (LVDS, LVPECL), I/O voltage (1.8, 2.5, 3.3 V), or frequency (25, 100, 125 MHz). In addition, the Si5335 provides a PCIe compliant, 100 MHz HCSL reference clock to the PCIe switch. 16 Rev. 1.4 Si5335 3. Functional Description Osc VDDO0 PLL Bypass CLK0A ÷MultiSynth0 XA / CLKIN XB / CLKINB CLK0B PLL PLL Bypass OEB0 CLKIN VDDO1 CLK1A ÷MultiSynth1 CLK1B P1 P2 P3 P5 P6 Programmable Pin Function Options: PLL Bypass OEB1 VDDO2 CLK2A ÷MultiSynth2 OEB0/1/2/3 OEB_all SSENB FS[1:0] RESET Control PLL Bypass CLK2B OEB2 VDDO3 CLK3A ÷MultiSynth3 CLK3B LOS OEB3 Figure 2. Si5335 Functional Block Diagram 3.1. Overview The Si5335 is a high-performance, low-jitter clock generator or buffer capable of synthesizing four independent user-programmable clock frequencies up to 350 MHz. The device supports free-run operation using an external 25 or 27 MHz crystal, or it can lock to an external clock for generating synchronous clocks. The output drivers support four differential clocks or eight single-ended clocks or a combination of both. The output drivers are configurable to support common signal formats, such as LVPECL, LVDS, HCSL, CML, CMOS, HSTL, and SSTL. Separate output supply pins allow supply voltages of 3.3, 2.5, 1.8, and 1.5 V to support the multi-format output driver. The core voltage supply accepts 3.3, 2.5, or 1.8 V and is independent from the output supplies. Using its two-stage synthesis architecture and patented high-resolution MultiSynth technology, the Si5335 can generate four independent frequencies from a single input frequency. In addition to clock generation, the inputs can bypass the synthesis stage enabling the Si5335 to be used as a high-performance clock buffer. Spread spectrum* is available on each of the clock outputs for EMI-sensitive applications, such as PCI Express. The device includes an interrupt pin that monitors for both loss of PLL lock (LOL) and loss of input signal (LOS) conditions while configured in clock generator mode. In clock generator mode, the LOS pin is asserted whenever LOL or LOS is true. In clock buffer mode (i.e., when the PLL is bypassed), the LOS pin is asserted whenever the input clock is lost. The LOL condition does not apply in clock buffer mode. *Note: See " Document Change List" on page 46 for more information. Rev. 1.4 17 Si5335 3.2. MultiSynth Technology Next-generation timing architectures require a wide range of frequencies which are often non-integer related. Traditional clock architectures address this by using a combination of single PLL ICs, 4-PLL ICs and discrete XOs, often at the expense of BOM complexity and power. The Si5335 uses patented MultiSynth technology to dramatically simplify timing architectures by integrating the frequency synthesis capability of 4 phase-locked loops (PLLs) in a single device, greatly minimizing size and power requirements versus traditional solutions. Based on a fractional-N PLL, the heart of the architecture is a low phase noise, high-frequency VCO. The VCO supplies a high frequency output clock to the MultiSynth block on each of the four independent output paths. Each MultiSynth operates as a high-speed fractional divider with Silicon Laboratories' proprietary phase error correction to divide down the VCO clock to the required output frequency with very low jitter. The first stage of the MultiSynth architecture is a fractional-N divider which switches seamlessly between the two closest integer divider values to produce the exact output clock frequency with 0 ppm error. To eliminate phase error generated by this process, MultiSynth calculates the relative phase difference between the clock produced by the fractional-N divider and the desired output clock and dynamically adjusts the phase to match the ideal clock waveform. This novel approach makes it possible to generate any output clock frequency without sacrificing jitter performance. Based on this architecture, the output of each MultiSynth can produce any frequency from 1 to 350 MHz. MultiSynth fVCO Fractional-N Divider Phase Adjust fOUT Phase Error Calculator Divider Select (DIV1, DIV2) Figure 3. Silicon Labs' MultiSynth Technology 3.3. ClockBuilder Web-Customization Utility ClockBuilder is a web-based utility available at www.silabs.com/ClockBuilder that allows hardware designers to tailor the Si5335’s flexible clock architecture to meet any application-specific requirements and order custom clock samples. Through a simple point-and-click interface, users can specify any combination of input frequency and output frequencies and generate a custom part number for each application-specific configuration. There are no minimum order quantity restrictions. ClockBuilder enables mass customization of clock generators. This allows a broader range of applications to take advantage of using application-specific pin controlled clocks, simplifying design while eliminating the firmware development required by traditional I2C-programmable clock generators. Based on Silicon Labs’ patented MultiSynth technology, the device PLL output frequency is constant and all clock output frequencies are synthesized by the four MultiSynth fractional dividers. All PLL parameters, including divider settings, VCO frequency, loop bandwidth, charge pump current, and phase margin are internally set by the device during the configuration process. This ensures optimized jitter performance and loop stability while simplifying design. 18 Rev. 1.4 Si5335 3.4. Input Configuration The Si5335 input can be driven from either an external crystal or a reference clock. Reference selection is made when the device configuration is specified using the ClockBuilder™ web-based utility available at www.silabs.com/ ClockBuilder. 3.4.1. Crystal Input If the crystal input option is used, the Si5335 operates as a free-running clock generator. In this mode of operation the device requires a low-cost 25 or 27 MHz fundamental mode crystal connected across XA and XB as shown in Figure 4. Given the Si5335’s frequency flexibility, the same 25 or 27 MHz crystal can be reused to generate any combination of output frequencies. Custom frequency crystals are not required. The Si5335 integrates the crystal load capacitors on-chip to reduce external component count. The crystal should be placed very close to the device to minimize stray capacitance. To ensure stable oscillation, the recommended crystal specifications provided in Tables 6 and 7 must be followed. See AN360 for additional details regarding crystal recommendations. Si5335 XA/CLKIN XTAL XB/CLKINB Figure 4. Connecting an XTAL to the Si5335 3.4.2. Differential Input Clocks The multi-format differential clock inputs of the Si5335 will interface with today’s most common differential signals, such as LVDS, LVPECL, CML, and HCSL. The differential inputs are internally self-biased and must be ac-coupled externally with a 0.1 µF capacitor. The receiver will accept a signal with a voltage swing between 400 mV and 2.4 VPP differential. Each half of the differential signal must not exceed 1.2 VPP at the input to the Si5335 or else the 1.3 V dc voltage limit may be exceeded. 3.4.2.1. LVDS Inputs When interfacing the Si5335 device to an LVDS signal, a 100  termination is required at the input along with the required dc blocking capacitors as shown in Figure 5. Must be ac coupled Keep termination close to input pin of the Si5335 0.1 uF Si5335 50 Pin 1 100 Pin 2 LVDS 50 0.1 uF Figure 5. LVDS Input Signal 3.4.2.2. LVPECL Input Clocks Recommended configurations for interfacing an LVPECL input signal to the Si5335 are shown in Figure 6. Typical values for the bias resistors (Rb) range between 120 and 200  depending on the LVPECL driver. The 100  resistor provides line termination. Because the receiver is internally self-biased, no additional external bias is required. Another solution is to terminate the LVPECL driver with a Thevenin configuration as shown in Figure 6b. The Rev. 1.4 19 Si5335 values for R1 and R2 are calculated to provide a 50 termination to VDD-2V. Given this, the recommended resistor values are R1 = 127 and R2 = 82.5  for VDD = 3.3 V, and R1 = 250 andR2 = 62.5 for VDD = 2.5 V. Keep termination close to input pin of the Si5335 3.3 V, 2.5 V 0.1 uF Si5335 50 Pin 1 100 Pin 2 50 LVPECL Rb 0.1 uF Rb Must be ac coupled LVPECL Input Signal with Source Biasing Option Keep termination close to input pin of the Si5335 VDD VDD Must be ac coupled R1 R1 VDD= 3.3 V, 2.5 V Si5335 0.1 uF 50 Pin 1 Pin 2 50 LVPECL 0.1 uF R2 R2 VT = VDD – 2 V R1 // R2 = 50 Ohm LVPECL Input Signal with Load Biasing Option Figure 6. Recommended Options for Interfacing to an LVPECL Input Signal Since the differential receiver of the Si5335 is internally self biased, an LVPECL signal may not be dc-coupled to the device. Figure 7 shows some common LVPECL connections that should not be used because of the dc levels they present at the receiver’s input. VDD DC Coupled with Thevenin Termination R1 V DD VDD AC Coupled with Thevenin Re-Biasing R1 V DD R1 R1 R2 R2 50 50 50 50 LVPECL LVPECL R2 Rb R2 Rb Not Recommended Figure 7. Common LVPECL Connections that May be Destructive to the Si5335 Input 20 Rev. 1.4 Si5335 3.4.2.3. CML Input Clocks CML signals may be applied to the differential inputs of the Si5335. Since the Si5335 differential inputs are internally self-biased, a CML signal may not be dc-coupled to the device. The recommended configurations for interfacing a CML input signal to the Si5335 are shown in Figure 8. The 100  resistor provides line termination, and, since the receiver is internally-biased, no additional external biasing components are required. Keep termination close to input pin of the Si5335 0.1 uF Si5335 50 Pin 1 100 Pin 2 CML 50 0.1 uF Must be ac coupled Figure 8. CML Input Signal 3.4.2.4. HCSL Input Clocks A typical HCSL driver has an open source output, which requires an external series resistor and a resistor to ground. The values of these resistors depend on the driver but are typically equal to 33  (Rs) and 50  (Rt). Note that the HCSL driver in the Si5335 requires neither Rs nor Rt resistors. Other than two ac-coupling capacitors, no additional external components are necessary when interfacing an HCSL signal to the Si5335. Must be ac coupled 3.3V, 2.5V, 1.8V 0.1 uF Rs Si5335 50 Pin 1 Pin 2 Rs 50 HCSL 0.1 uF Rt Rt Figure 9. HCSL Input Signal to Si5335 Rev. 1.4 21 Si5335 3.4.3. Single-Ended CMOS Input Clocks For synchronous timing applications, the Si5335 can lock to a 10 to 200 MHz CMOS reference clock. A typical interface circuit is shown in Figure 10. A series termination resistor may be required if the CMOS driver impedance does not match the trace impedance. Keep R se and Rsh close to the receiver 0.1 uF Si5335 Rse CMOS Input Signal 50 Pin 1 1.8 V CMOS Rse = 249  Rsh = 464  Rsh 3.3 V CMOS Pin 2 Rse = 499  Rsh = 274  2.5 V CMOS 0.1 uF Rse = 402  Rsh = 357  Figure 10. Interfacing CMOS Reference Clocks to the Si5335 3.4.4. Single-Ended SSTL and HSTL Input Clocks HSTL and SSTL single-ended inputs can be input to the differential inputs, pins 1 and 2, of the Si5335 with the circuit shown in Figure 11. Some drivers may require a series 25  resistor. If the SSTL/HSTL input is being driven by another Si5335 device, the 25  series resistor is not required as this is integrated on-chip. The maximum recommended input frequency in this case is 350 MHz. Keep termination close to input pin of the Si5335 VTT 50 0.4 to 1.2 V pk-pk 0.1 uF 50 Si5335 Pin 1 Differential Input VDD R1 Pin 2 0.1 uF VTT 0.1 uF R2 SSTL_2, SSTL_18, HSTL R1 = 2.43 k R2 = 2 k SSTL_3 R1 = 2.43 k R2 = 2 k Figure 11. Single-Ended SSTL/HSTL Input Clocks to the Si5335 22 Rev. 1.4 Si5335 3.4.5. Applying a Single-Ended Clock to the Differential Input Clock Pins It is possible to interface any single-ended clock signal to the differential input pins (XA/CLKIN, XB/CLKINB). The recommended interface for a signal that requires a 50  load is shown in Figure 12. On these inputs, it is important that the signal level be less than 1.2 VPP SE and greater than 0.4 VPP SE. The maximum recommended input frequency in this case is 350 MHz. Keep termination close to input pin of the Si5335 0.1 uF 0.4 to 1.2V pk-pk Si5335 50 Pin 1 50 Pin 2 0.1 uF Figure 12. Single-Ended Input Signal with 50  Termination 3.5. Input and Output Frequency Configuration The Si5335 utilizes a single PLL-based architecture, four independent MultiSynth fractional output dividers, and a MultiSynth fractional feedback divider such that a single device provides the clock generation capability of 4 independent PLLs. Unlike competitive multi-PLL solutions, the Si5335 can generate four unique non-integer related output frequencies with 0 ppm frequency error for any combination of output frequencies. In addition, any combination of output frequencies can be generated from a single reference frequency without having to change the crystal or reference clock frequency between frequency configurations. The Si5335 frequency configuration is set when the device configuration is specified using the ClockBuilder webbased utility available at www.silabs.com/ClockBuilder. Any combination of output frequencies ranging from 1 to 350 MHz can be configured on each of the device outputs. Up to three unique device configurations can be specified in a single device, enabling the Si5335 to replace 3 different clock generators or clock buffers. 3.6. Multi-Function Control Inputs The Si5335 supports five user-defined input pins (pins 3, 5, 6, 12, 19) that are customizable to support the functions listed below. The pinout of each device is customized using the ClockBuilder utility. This enables the device to be custom tailored to a specific application. Each of the different functions is described in further detail below. Table 14. Multi-Function Control Inputs Pin Function OEB_all OEB0 OEB1 OEB2 OEB3 Description Output Enable All. All outputs enabled when low. Output Enable Bank 0. CLK0A/0B enabled when low. Output Enable Bank 1. CLK1A/1B enabled when low. Output Enable Bank 2. CLK2A/2B enabled when low. Output Enable Bank 3. CLK3A/3B enabled when low. Assignable Pin Name P1, P2, P3, P5*, P6* P1, P2, P3, P5*, P6* P1, P2, P3, P5*, P6* P1, P2, P3, P5*, P6* P1, P2, P3, P5*, P6* Rev. 1.4 23 Si5335 Table 14. Multi-Function Control Inputs (Continued) FS0 FS1 RESET SSENB P1 Frequency Select. Selects active device frequency plan from factory-configured profiles. See “3.8. Frequency Select/Device Reset” for more information. Frequency Select. Selects active device frequency plan from factory-configured profiles. See “3.8. Frequency Select/Device Reset” for more information. Reset. Asserting this pin (driving high) is required to change FS1,FS0 pin setting. Reset is not required if FS1,FS0 pins are unassigned. Spread Spectrum Enable. Enables PCI-compliant spread spectrum clocking on all 100 MHz clock outputs when low. P1 (for 2-plan devices) P2 (for 3-plan devices) P1, P2, P3 P1, P2, P3, P5*, P6* *Note: See “3.6.1. P5 and P6 Input Control” for recommended termination circuits for these pins. 3.6.1. P5 and P6 Input Control Control input signals to P5 and P6 cannot exceed 1.2 V. When these inputs are driven from CMOS sources, a resistive attenuator is required for pins 5 and 6, as shown in Figure 13. Keep Rse and Rsh close to pin 5 and pin 6 Si5335 Rse CMOS input signal Pin 5, Pin 6 50 Rsh 1.8 V CMOS Rse = 1 k Rsh = 1.58 k 2.5 V CMOS 1.96 k 1.58 k 3.3 V CMOS 3.09 k 1.58 k Figure 13. P5, P6 Control Pin Termination 3.7. Output Enable Each of the device’s four banks of clock outputs can be individually disabled using OEB0, OEB1, OEB2 and OEB3, respectively. Alternatively, all clock outputs can be disabled using the master output enable OEB_all. When a Si5335 clock output bank is disabled, the output disable state is determined by the configuration specified in the ClockBuilder web utility. When one or more banks of clock outputs are enabled or disabled, clock start and stop transitions are handled glitchlessly. 3.8. Frequency Select/Device Reset The device frequency plan is customized using the ClockBuilder web utility. The Si5335 optionally supports up to three unique, pin-selectable configurations per device, enabling one device to replace up to three separate clock ICs. To select a particular frequency plan, set the FS pins as outlined below: For custom Si5335 devices configured to support two frequency plans, the FS1 pin should be set as follows: FS1 24 Profile Rev. 1.4 Si5335 0 1 1 2 For custom Si5335 devices configured to support three frequency plans, the FS1 and FS0 pins should be set as follows: FS1 FS0 Profile 0 0 Reserved 0 1 1 1 0 2 1 1 3 If a change is made to the FS pin settings, the device reset pin (RESET) must be held high for the minimum pulse width specified in Table 3 on page 5 to change the device configuration. The output clocks will be momentarily squelched until the device begins operation with the new frequency plan. If the RESET pin is not selected in ClockBuilder as one of the five programmable pins, a power-on reset must be applied for an FS pin change to take effect. 3.9. Loss-of-Signal Alarm The Si5335 supports a loss of signal (LOS) output indicator for monitoring the condition of the crystal/clock reference input. The LOS condition occurs when there is no input clock to the device or the PLL has lost lock (in clock generator mode). When an input clock is removed, the LOS pin will assert and the output clocks may drift up to 5% (in clock generator mode). When the input clock with an appropriate frequency is reapplied, the LOS pin will deassert. In clock buffer mode, LOS is driven high when the input clock is lost. LOS Output State 0 1 Description Input clock present and PLL is locked Input clock not present and PLL is not locked Rev. 1.4 25 Si5335 3.10. Output Stage The output stage consists of programmable output drivers as shown in Figure 14. Output Stage VDDO0 CLK0A From Synthesis Stage or Input Stage CLK0B VDDO1 CLK1A CLK1B VDDO2 CLK2A CLK2B VDDO3 CLK3A CLK3B Figure 14. Output Stage The Si5335 devices provide four outputs that can be differential or single-ended. When configured as singleended, the driver generates two signals that can be configured as in-phase or complementary. Each of the outputs has its own output supply pin, allowing the device to be used in mixed supply applications without the need for external level translators. The CML output driver generates a similar output swing as the LVPECL driver but consumes half the current. CML outputs must be ac-coupled. 3.10.1. CMOS/LVTTL Outputs The CMOS output driver has a controlled impedance of about 50 , which includes an internal series resistor of approximately 22 . For this reason, an external Rs series resistor is not recommended when driving 50  traces. If the trace impedance is higher than 50 , a series resistor, Rs, should be used. A typical configuration is shown in Figure 15. A CMOS output driver can be configured with ClockBuilder as a single- or dual-output driver. Dual otuput configurations support in-phase or complementary outputs. The output supports 3.3, 2.5, and 1.8 V CMOS signal levels when the appropriate voltage is supplied to the external VDDO pin and the device is configured accordingly. 3.3, 2.5, or 1.8 V VDDOx LVTTL/ CMOS Si5335 CLKxA CMOS 50 CLKxB 50 Figure 15. Interfacing to a CMOS Receiver 26 Rev. 1.4 Si5335 3.10.2. SSTL and HSTL Outputs The Si5335 supports both SSTL and HSTL outputs, which can be single-ended or differential. The recommended termination scheme for SSTL is shown in Figure 16. The VTT supply can be generated using a simple voltage divider as shown below (note that Rt = 50 ). SSTL (3.3, 2.5, or 1.8 V) HSTL (1.5 V) VTT VTT VDDOx Rt Si5335 SSTL or HSTL CLKxA Rt 50 SSTL_3 SSTL_2 SSTL_18 HSTL CLKxB 50 VDDO R1 VTT SSTL_2, SSTL_18, HSTL R1 = 2 k R2 = 2 k SSTL_3 R1 = 2.43 k R2 = 2 k 0.1 µF R2 Figure 16. Interfacing the Si5335 to an SSTL or HSTL Receiver 3.10.3. LVPECL Outputs The LVPECL driver is configurable in both 3.3 V or 2.5 V standard LVPECL modes. The output driver can be accoupled or dc-coupled to the receiver. 3.10.3.1. DC-Coupled LVPECL Outputs The standard LVPECL driver supports two commonly used dc-coupled configurations. Both of these are shown in Figure 17a and Figure 17b. LVPECL drivers were designed to be terminated with 50  to VDD–2 V, which is illustrated in Figure 17a. VTT can be supplied with a simple voltage divider as shown. An alternative method of terminating LVPECL is shown in Figure 17b, which is the Thevenin equivalent to the termination in Figure 17a. It provides a 50  load terminated to VDD–2.0 V. For 3.3 V LVPECL, use R1 = 127 and R2 = 82.5 ; for 2.5 V LVPECL, use R1 = 250 and R2 = 62.5 The only disadvantage to this type of termination is that the Thevenin circuit consumes additional power from the VDDO supply. Rev. 1.4 27 Si5335 Keep termination close to the receiver 3.3 V, 2.5 V VDDOx 50 Si5335 50 CLKxA LVPECL 3.3 V LVPECL 2.5 V LVPECL VTT = VDDO – 2.0 CLKxB 50 50 a. DC-Coupled Termination of 50  to VDDO – 2.0 V VDDO VDDO 3.3 V, 2.5 V VDDOx R1 Keep termination close to the receiver R1 Si5335 3.3 V LVPECL 2.5 V LVPECL CLKxA LVPECL 50 CLKxB 50 3.3 V LVPECL R2 R2 VT = VDDO – 2.0 V R1 // R2 = 50  R1 = 127  R2 = 82.5  2.5 V LVPECL R1 = 250  R2 = 62.5  b. DC-Coupled with Thevenin Termination Figure 17. Interfacing the Si5335 to an LVPECL Receiver Using DC Coupling 28 Rev. 1.4 Si5335 3.10.3.2. AC Coupled LVPECL Outputs AC coupling is necessary when a receiver and a driver have compatible voltage swings but different commonmode voltages. AC coupling works well for dc-balanced signals, such as for 50% duty cycle clocks. Figure 18 describes two methods for ac coupling the standard LVPECL driver. The Thevenin termination shown in Figure 18a is a convenient and common approach when a VBB (VDD – 1.3 V) supply is not available; however, it does consume additional power. The termination method shown in Figure 18b consumes less power. A VBB supply can be generated from a simple voltage divider circuit as shown in Figure 18b. VDDO VDDO 3.3 V, 2.5 V VDDOx R1 Si5335 Keep termination close to the receiver R1 3.3 V LVPECL 2.5 V LVPECL 0.1 µF 50 CLKxA LVPECL CLKxB 50 0.1 µF Rb R2 Rb VDDO – 1.3 V R1 // R2 = 50  R2 3.3 V LVPECL R1 = 82.5  R2 = 127  2.5 V LVPECL Rb = 130  (2.5 V LVPECL) Rb = 200 
(3.3 V LVPECL) R1 = 62.5  R2 = 250  a. AC-Coupled with Thevenin Termination Keep termination close to the receiver 3.3 V, 2.5 V 0.1 µF VDDOx 50 Si5335 50 CLKxA LVPECL 3.3 V LVPECL 2.5 V LVPECL VBB CLKxB 50 0.1 µF 50 Rb VDDO VDDO – 1.3 V Rb R1 Rb = 130  (2.5 V LVPECL) Rb = 200  (3.3 V LVPECL) VBB 0.1 µF R2 b. AC Coupled with 100  Termination Figure 18. Interfacing to an LVPECL Receiver Using AC Coupling Rev. 1.4 29 Si5335 3.10.4. LVDS Outputs The LVDS output option provides a very simple and power-efficient interface that requires no external biasing when connected to an LVDS receiver. An ac-coupled LVDS driver is often useful as a CML driver. The LVDS driver may be dc-coupled or ac-coupled to the receiver in 3.3 V or 2.5 V output mode. 3.10.4.1. AC-Coupled LVDS Outputs The Si5335 LVDS output can drive an ac-coupled load. The ac coupling capacitors may be placed at either the driver or receiver end, as long as they are placed prior to the 100  termination resistor. Keep the 100  termination resistor as close to the receiver as possible, as shown in Figure 19. When a 1.8 V output supply voltage is used, the LVDS output of the Si5335 produces a common-mode voltage of ~0.875 V, which does not support the LVDS standard. In this case, it is best to ac-couple the output to the load. Keep termination close to the receiver 3.3 V or 2.5 V VDDOx Si5335 50 LVDS CLKxA LVDS 100  CLKxB 50 DC-Coupled LVDS Output Keep termination close to the receiver 3.3 V, 2.5 V, or 1.8 V VDDOx 0.1 µF Si5335 50 CLKxA LVDS 100  CLKxB 50 0.1 µF AC-Coupled LVDS Output Figure 19. Interfacing to an LVDS Receiver 30 Rev. 1.4 Si5335 3.10.5. HCSL Outputs Host clock signal level (HCSL) outputs are commonly used in PCI Express applications. A typical HCSL driver has an open source output that requires an external series resistor and a resistor to ground. The Si5335 HCSL driver has integrated these resistors to simplify the interface to an HCSL receiver. No external components are necessary when connecting the Si5335 HCSL driver to an HCSL receiver. 3.3, 2.5, or 1.8 V VDDOx Rs 50 HCSL CLKxA HCSL CLKxB Rs 50 Rt Rt Si5335 Figure 20. Interfacing the Si5335 to an HCSL Receiver 3.10.6. CML Outputs Current mode logic (CML) is transmitted differentially and terminated to 50  to Vcc as shown in Figure 20. A CML receiver can be driven with either an LVPECL, CML, or LVDS output. To drive a CML receiver, an Si5335 output configured in LVPECL or CML mode generates a single-ended output swing of 550 mV to 960 mV. However, to reduce power consumption by approximately 15 mA per output driver pair (compared to an LVPECL-configured output), the Si5335's CML output mode can be selected without affecting the output voltage swing. For even lower power consumption, depending on the input signal swing required, CML receivers can be driven with an Si5335 output configured in LVDS mode. CML output format is not available when the Si5335 is in PLL bypass (clock buffer) mode. Driving a CML Receiver Using the LVPECL Output Si5335 CML Receiver 550 mV to 960 mVp-p 0.1 µF 50 50 0.1 µF LVPECL Vcc 50 50 Rb Rb Rb = 130 
(2.5 V LVPECL) Rb = 200 
(3.3 V LVPECL) Driving a CML Receiver Using the CML or LVDS Output Si5335 670 mV to 1070 mVp-p (CML) 250 mV to 450 mVp-p (LVDS) CML Receiver 0.1 µF 50 50 CML or LVDS 0.1 µF Vcc 50 50 Figure 21. Terminating an LVPECL or an LVDS Output to a CML Receiver Rev. 1.4 31 Si5335 4. Power Consumption In clock generator mode, the Si5335 Power consumption is a function of the following:  Supply voltage Frequency of output Clocks  Number of output Clocks  Format of output Clocks Because of internal voltage regulation, the current from the core VDD is independent of the VDD voltage and hence the plot shown in Figure 5 can be used to estimate the VDD core (pins 7 and 24) current.  The current from the output supply voltages can be estimated from the values provided in Table 2, “DC Characteristics,” on page 4. To get the most accurate value for VDD currents, the Si5338-EVB with ClockBuilder Desktop software should be used. To do this, go to the “Power” tab of ClockBuilder Desktop and press “Measure”. In this manner, a specific configuration can be implemented on the EVB and the actual current for each supply voltage measured. When doing this it is critical that the output drivers have the proper load impedance for the selected format. When testing for output driver current with HSTL and SSTL, it is required to have load circuitry as shown in "3.10.2. SSTL and HSTL Outputs" on page 27. The Si5338 EVB has layout pads that can be used for this purpose. When testing for output driver current with LVPECL the same layout pads can be used to implement the LVPECL bias resistor of 130  (2.5 V VDDx) or 200  (3.3 V VDDx). See the schematic in the Si5338-EVB data sheet and AN408 for additional information. 80 4 Active Outputs, Fractional Output MS 75 4 Active Outputs, Integer Output MS 3 Active Outputs, Fractional Output MS 70 Typical VDD Core Current (ma) 3 Active Outputs, Integer Output MS 2 Active Outputs, Fractional Output MS 65 2 Active Outputs, Integer Output MS 1 Active Output, Fractional Output MS 60 1 Active Output, Integer Output MS 55 50 45 40 35 30 0 50 100 150 200 250 300 350 Output Frequency (MHz) Figure 22. Core VDD Supply Average Current vs Output Frequency 32 Rev. 1.4 400 Si5335 5. Spread Spectrum To help reduce electromagnetic interference (EMI), the Si5335 supports spread spectrum modulation in clock generator mode only. The output clock frequencies can be modulated to spread energy across a broader range of frequencies, lowering system EMI. Spread spectrum modulation is generated digitally in the output MultiSynth dividers, which means that the spread spectrum parameters are virtually independent of process, voltage, and temperature variations. If the SSENB function is assigned to a pin in ClockBuilder and asserted (driven low), PCIe-compliant spread spectrum is applied to all 100 MHz output clocks with a default spreading rate of 31.5 kHz and 0.5% down spread. If no 100 MHz output clocks are defined but the SSENB is assigned and asserted, none of the output clocks will have spread spectrum clocking applied. Some custom spread-spectrum clocking profiles are available. If the Si5335's default PCIe spread spectrum profile is not suitable for your application, submit your custom spread spectrum requirements for review by visiting the Silicon Labs Technical Support web page at https:// www.silabs.com/support/pages/contacttechnicalsupport.aspx, or contact your local Silicon Labs sales representative for more information. Clock with SSC Off Reduced Amplitude and EMI Clock with SSC On (downspread) Carrier Frequency f Figure 23. Spread Spectrum Clocking Impact on Output Power Spectrum Rev. 1.4 33 Si5335 6. Jitter Performance The Si5335 provides consistently low jitter for any combination of output frequencies. The device leverages a low phase noise single PLL architecture and Silicon Laboratories’ patented MultiSynth fractional output divider technology to deliver period jitter of 10 ps pk-pk (typ). The Si5335 provides superior performance to conventional multi-PLL solutions which may suffer from degraded jitter performance depending on frequency plan and the number of active PLLs. 7. Power Supply Considerations Additive Jitter (ps pk-pk) The Si5335 has 2 core supply voltage pins (VDD) and 4 clock output bank supply voltage pins (VDDO0–VDDO3), enabling the device to be used in mixed supply applications. The Si5335 does not typically require ferrite beads for power supply filtering. The device has extensive on-chip power supply regulation to minimize the impact of power supply noise on output jitter. Figure 24 shows that the additive jitter created when a significant amount of noise is applied to the device power supply is very low. 10 9 8 7 6 5 4 3 2 1 0 0.0001 VDDO VDD 0.001 0.01 0.1 1 Modulation Frequency (MHz) Figure 24. Peak-to-Peak Additive Jitter from 100 mV Sine Wave on Supply 34 Rev. 1.4 Si5335 8. Loop Bandwidth Considerations For synchronous reference clock applications, two user-selectable loop bandwidth settings (1.6 MHz and 475 kHz) are available to allow designers to optimize their timing system to support jitter attenuation of the reference clock. In general, the 1.6 MHz setting provides the lowest output jitter and should be selected for most applications. The 1.6 MHz option provides faster PLL tracking of the input clock but less jitter attenuation of the input clock than the 475 kHz loop bandwidth option. The 1.6 MHz loop bandwidth option must be selected for all applications which use a crystal reference input on the XA/XB pins (pins 1 and 2) and for all applications which provide a low jitter input clock reference to the Si5335. The 475 kHz setting reduces the clock generator's loop bandwidth, which has the benefit of attenuating some of jitter that would normally pass through the 1.6 MHz setting. As the PLL loop bandwidth decreases, the intrinsic jitter of the device increases and is reflected in higher jitter generation specifications, but total output jitter is the best measure of system performance. Total output jitter includes both the generated jitter as well as the transferred jitter. This lower loop bandwidth option can be useful in some applications, such as PCIe, DSL or other systems which may utilize backplane distributed reference clocks. In these systems, the input clock may have appreciable low frequency jitter (e.g., < 1.6 MHz). The source of the reference clock jitter can arise from suboptimal PCB trace layouts, impedance mismatches and connectors. Input clock jitter may also be generated from an IC which has poor power supply rejection performance, resulting in switching power supply noise and jitter coupling onto the clock input of the Si5335. In these applications, designers may opt to use the 475 kHz loop bandwidth to help attenuate the input clock jitter. Proper selection of PLL loop bandwidth involves a number of application-specific considerations. Refer to “AN513: Jitter Attenuation—Choosing the Right Phase-Locked Loop Bandwidth” for more information. Please also refer to “AN624: Si5335 Solves Timing Challenges in PCI Express, Computing, Communications and FPGA-Based Systems”. Rev. 1.4 35 Si5335 9. Applications of the Si5335 Because of its flexible architecture, the Si5335 can be configured to serve several functions in the timing path. The following sections describe some common applications. 9.1. Free-Running Clock Generator Using the internal oscillator (Osc) and an inexpensive external crystal (XTAL), the Si5335 can be configured as a free-running clock generator for replacing high-end and long-lead-time crystal oscillators found on many printed circuit boards (PCBs). Replacing several crystal oscillators with a single IC solution helps consolidate the bill of materials (BOM), reduces the number of suppliers, and reduces the number of long-lead-time components on the PCB. In addition, since crystal oscillators tend to be the least reliable aspect of many systems, the overall failure-intime (FIT) rate improves with the elimination of each oscillator. Up to four independent clock frequencies can be generated at any rate within its supported frequency range and with any of supported output types. Figure 25 shows the Si5335 configured as a free-running clock generator. Osc XTAL ref PLL MS0 F0 MS1 F1 MS2 F2 MS3 F3 Si5335 Figure 25. Si5335 as a Free-Running Clock Generator 9.2. Synchronous Frequency Translation In other cases, it is useful to generate an output frequency that is synchronous (or phase-locked) to another clock frequency. The Si5335 is the ideal choice for generating up to four clocks with different frequencies with a fixed phase relationship to an input reference. Because of its highly precise frequency synthesis, the Si5335 can generate all four output frequencies with 0 ppm error to the input reference. The Si5335 is an ideal choice for applications that have traditionally required multiple stages of frequency synthesis to achieve complex frequency translations. Examples are in broadcast video (e.g., 148.5 MHz to 148.3516483 MHz), WAN/LAN applications (e.g. 155.52 MHz to 156.25 MHz), and Forward Error Correction (FEC) applications (e.g., 156.25 MHz to 161.1328125 MHz). Figure 26 shows the Si5335 configured as a synchronous clock generator. Frequencies may be entered into the ClockBuilder Web utility with up to seven decimal points to ensure that the exact frequencies can be achieved. Si5335 CLKIN MS0 F0 MS1 F1 MS2 F2 MS3 F3 PLL Figure 26. Si5335 as a Synchronous Clock Generator or Frequency Translator 36 Rev. 1.4 Si5335 9.3. Configurable Universal Buffer and Level Translator Using the ClockBuilder web utility, the synthesis stage can be entirely bypassed allowing the Si5335 to act as a configurable clock buffer with level translation. Because of its highly selectable configuration, virtually any output format and I/O voltage combination is possible. The configurable output drivers allow four differential outputs, eight single-ended outputs, or a combination of both. Figure 27 shows the Si5335 configured as a flexible clock buffer supporting mixed I/O supplies. Si5335 3.3 V LVDS 2.5 V CMOS CLKIN 1.8 V LVPECL 3.3 V HCSL Figure 27. Si5335 as a Configurable Clock Buffer with Level Translation Rev. 1.4 37 Si5335 RSVD_GND Top View VDD CLK0A CLK0B VDDO0 P2 10. Pin Descriptions 24 23 22 21 20 19 XA/CLKIN 1 18 CLK1A XB/CLKINB 2 17 CLK1B P3 3 16 VDDO1 GND GND Pad GND 4 15 VDDO2 P5 5 14 CLK2A 13 CLK2B 7 8 9 10 11 12 VDD LOS CLK3B CLK3A VDDO3 P1 P6 6 Note: Center pad must be tied to GND for normal operation. Table 15. Si5335 Pin Descriptions Pin # Pin Name I/O Signal Type Description XA/CLKIN, XB/CLKINB. 1,2 I Multi 3 P3 I Multi Multi-Function Input. 3.3 V tolerant. This pin functions as a multi-function input pin. The pin function (OEB_all, OEB0, OEB1, OEB2, OEB3, SSENB, or RESET) is user-selectable at time of configuration using the ClockBuilder web configuration utility. 4 GND GND GND Ground. Must be connected to system ground for proper device operation. Multi Multi-Function Input. These pins function as multi-function input pins. The pin functions (OEB_all, OEB0, OEB1, OEB2, OEB3, or SSENB) are userselectable at time of configuration using the ClockBuilder configuration utility. A resistor voltage divider is required when driven by a signal greater than 1.2 V. See "3.6.1. P5 and P6 Input Control" on page 24 for details. Supply Core Supply Voltage. This is the core supply voltage, which can operate from a 1.8, 2.5, or 3.3 V supply. A 0.1 µF bypass capacitor should be located very close to this pin. 5,6 7 38 XA/CLKIN, XB/CLKINB These pins are used as the main differential or single-ended clock input or as the XTAL input. See "3.4. Input Configuration" on page 19 and Figures 10, 11, and 12 for connection details. Clock inputs to these pins must be ac-coupled. Keep the traces from pins 1,2 to the crystal as short as possible and keep other signals and radiating sources away from the crystal. The single-ended input voltage swing must be limited to 1.2 Vpp. P5, P6 VDD I VDD Rev. 1.4 Si5335 Table 15. Si5335 Pin Descriptions (Continued) Pin # 8 9 10 11 12 13 14 15 16 Pin Name LOS CLK3B CLK3A VDDO3 P1 CLK2B CLK2A VDDO2 VDDO1 I/O O O O VDD I O O VDD VDD Signal Type Description Open Drain Loss of Signal. A typical pullup resistor of 1–4 k is used on this pin. This pin can be pulled up to a supply voltage as high as 3.6 V regardless of the other supply voltages on pins 7, 11, 15, 16, 20, and 24. The LOS condition allows the pull up resistor to pull the output up to the supply voltage. See "3.9. Loss-of-Signal Alarm" on page 25. This pin functions as an input clock loss-of-signal and PLL lock status pin in clock generator mode: 0 = Input clock present and PLL locked. 1 = Input clock not present or PLL not locked. In clock buffer mode, LOS is asserted when the input clock is not present. Multi Output Clock B for Channel 3. May be a single-ended output or half of a differential output with CLK3A being the other differential half. If unused, leave this pin floating. Multi Output Clock A for Channel 3. May be a single-ended output or half of a differential output with CLK3B being the other differential half. If unused, leave this pin floating. Supply Output Clock Supply Voltage. Supply voltage (3.3, 2.5, 1.8, or 1.5 V) for CLK3A,B. A 0.1 µF capacitor must be located very close to this pin. If CLK3 is not used, this pin must be tied to VDD (pin 7, 24). Multi Multi-Function Input. 3.3 V tolerant. This pin functions as a multi-function input pin. The pin function (OEB_all, OEB0, OEB1, OEB2, OEB3, SSENB, FS0, FS1, or RESET) is user-selectable at time of configuration using the ClockBuilder web configuration utility Multi Output Clock B for Channel 2. May be a single-ended output or half of a differential output with CLK2A being the other differential half. If unused, leave this pin floating. Multi Output Clock A for Channel 2. May be a single-ended output or half of a differential output with CLK2B being the other differential half. If unused, leave this pin floating. Supply Output Clock Supply Voltage. Supply voltage (3.3, 2.5, 1.8, or 1.5 V) for CLK2A,B. A 0.1 µF capacitor must be located very close to this pin. If CLK2 is not used, this pin must be tied to VDD (pin 7, 24). Supply Output Clock Supply Voltage. Supply voltage (3.3, 2.5, 1.8, or 1.5 V) for CLK1A,B. A 0.1 µF capacitor must be located very close to this pin. If CLK1 is not used, this pin must be tied to VDD (pin 7, 24). Rev. 1.4 39 Si5335 Table 15. Si5335 Pin Descriptions (Continued) Pin # 17 18 19 Pin Name CLK1B CLK1A P2 I/O O O I Signal Type Description Multi Output Clock B for Channel 1. May be a single-ended output or half of a differential output with CLK1A being the other differential half. If unused, leave this pin floating. Multi Output Clock A for Channel 1. May be a single-ended output or half of a differential output with CLK1B being the other differential half. If unused, leave this pin floating. Multi Multi-Function Input. 3.3 V tolerant. This pin functions as a multi-function input pin. The pin function (OEB_all, OEB0, OEB1, OEB2, OEB3, SSENB, FS1, or RESET) is user-selectable at time of configuration using the ClockBuilder web configuration utility. Output Clock Supply Voltage. Supply voltage (3.3, 2.5, 1.8, or 1.5 V) for CLK0A,B. A 0.1 µF capacitor must be located very close to this pin. If CLK0 is not used, this pin must be tied to VDD (pin 7, 24). 20 VDDO0 VDD Supply 21 CLK0B O Multi Output Clock B for Channel 0. May be a single-ended output or half of a differential output with CLK0A being the other differential half. If unused, leave this pin floating. 22 CLK0A O Multi Output Clock A for Channel 0. May be a single-ended output or half of a differential output with CLK0B being the other differential half. If unused, leave this pin floating. 23 RSVD_GND GND GND Ground. Must be connected to system ground. Minimize the ground path impedance for optimal performance of this device. 24 VDD VDD Supply GND PAD GND GND GND 40 Core Supply Voltage. The device operates from a 1.8, 2.5, or 3.3 V supply. A 0.1 µF bypass capacitor should be located very close to this pin. Ground Pad. This is the large pad in the center of the package. The device will not function unless the ground pad is properly connected to a ground plane on the PCB. See Table 17, “PCB Land Pattern,” on page 43 for ground via requirements. Rev. 1.4 Si5335 11. Ordering Information Si5335X BXXXXX GMR Operating Temp Range: -40 to +85 °C Package: 4 x 4 mm QFN, RoHS6, Pb-free R = Tape & Reel (ordering option) Non Tape & Reel shipment media is trays B = Product Revision B XXXXX = NVM code. Custom NVM configuration code. A unique 5-digit ordering code will be assigned by the ClockBuilder web utility . Frequency/Configuration: Si5335A Si5335B Si5335C Si5335D - 1 MHz to 350 MHz output with XTAL input 1 MHz to 200 MHz output with XTAL input 1 MHz to 350 MHz output with Differential/Single-ended input clock 1 MHz to 200 MHz output with Differential/Single-ended input clock Evaluation Boards Si5338 EVB Si5335 Evaluation Board The Si5338-EVB with ClockBuilder Desktop software includes the ability to evaluate Si 5335 output frequency and format configurations. The EVB does not currently include the ability to control the programmable function pins (P1, P2, P3, P5, and P6). Rev. 1.4 41 Si5335 12. Package Outline: 24-Lead QFN Figure 28. 24-Lead Quad Flat No-lead (QFN) Table 16. Package Dimensions Dimension Min Nom Max A 0.80 0.85 0.90 A1 0.00 0.02 0.05 b 0.18 0.25 0.30 D D2 4.00 BSC. 2.35 2.50 e 0.50 BSC. E 4.00 BSC. 2.65 E2 2.35 2.50 2.65 L 0.30 0.40 0.50 aaa 0.10 bbb 0.10 ccc 0.08 ddd 0.10 eee 0.05 Notes: 1. 2. 3. 4. All dimensions shown are in millimeters (mm) unless otherwise noted. Dimensioning and Tolerancing per ANSI Y14.5M-1994. This drawing conforms to the JEDEC Outline MO-220, variation VGGD-8. Recommended card reflow profile is per the JEDEC/IPC J-STD-020 specification for Small Body Components. 5. Terminal base alloy: Cu 6. Terminal plating/grid array material: Au/NiPd. 7. Visit www.silabs.com/support/quality/pages/RoHSInformation.aspx for more information. 42 Rev. 1.4 Si5335 13. Recommended PCB Land Pattern Table 17. PCB Land Pattern Dimension Min Nom Max P1 2.50 2.55 2.60 P2 2.50 2.55 2.60 X1 0.20 0.25 0.30 Y1 0.75 0.80 0.85 C1 3.90 C2 3.90 E 0.50 Notes General: 1. All dimensions shown are in millimeters (mm) unless otherwise noted. 2. Dimensioning and Tolerancing per ANSI Y14.5M-1994 specification. 3. This Land Pattern Design is based on the IPC-7351 guidelines. 4. Connect the center ground pad to a ground plane with no less than five vias. These 5 vias should have a length of no more than 20 mils to the ground plane. Via drill size should be no smaller than 10 mils. A longer distance to the ground plane is allowed if more vias are used to keep the inductance from increasing. Solder Mask Design: 5. All metal pads are to be non-solder mask defined (NSMD). Clearance between the solder mask and the metal pad is to be 60 µm minimum, all the way around the pad. Stencil Design: 6. A stainless steel, laser-cut and electro-polished stencil with trapezoidal walls should be used to assure good solder paste release. 7. The stencil thickness should be 0.125 mm (5 mils). 8. The ratio of stencil aperture to land pad size should be 1:1 for all perimeter pins. 9. A 2x2 array of 1.0 mm square openings on 1.25 mm pitch should be used for the center ground pad. Card Assembly: 10. A No-Clean, Type-3 solder paste is recommended. 11. The recommended card reflow profile is per the JEDEC/IPC J-STD-020 specification for Small Body Components. Rev. 1.4 43 Si5335 14. Top Marking 14.1. Si5335 Top Marking Si5335 Xxxxxx RTTTTT YYWW 14.2. Top Marking Explanation Line Characters Description Line 1 Si5335 Base part number. Line 2 Xxxxxx X = Frequency and configuration code. See "11. Ordering Information" on page 41 for more information. xxxxx = NVM code assigned by ClockBuilder web utility. See "11. Ordering Information" on page 41. Line 3 RTTTTT R = Product revision. TTTTT = Manufacturing trace code. Circle with 0.5 mm diameter; Pin 1 indicator. left-justified Line 4 YYWW 44 YY = Year. WW = Work week. Characters correspond to the year and work week of package assembly. Rev. 1.4 Si5335 15. Device Errata Please visit www.silabs.com to access the device errata document. Rev. 1.4 45 Si5335 DOCUMENT CHANGE LIST Revision 1.0 to Revision 1.1  Revision 0.4 to Revision 0.9  Updated Table 2, “DC Characteristics,” on page 4. Added  Added  TRESET specification. Updated   VI on pin 1 to 1.3 V (max). CML output voltage specification to 0.86 Vpp. CL to 18 pF (typical). Revision 1.1 to Revision 1.2 CL to 18 pF (typical). Updated "3.4. Input Configuration" on page 19. Revision 1.2 to Revision 1.3 Revised  text in Section 3.4.2. Revision 1.3 to Revision 1.4 Added  Updated Features on page 1. Updated Description on page 1.  Updated specs in Table 8.  Updated specs in Table 9. Figure 13 to replace Table 15. Corrected  Assignable Pin Name column entries. Updated "3.10. Output Stage" on page 26. Revised throughout and included termination circuit diagrams and text. Removed references to P4 as a programmable pin option throughout document. Pin 4 is now a ground pin. Revision 0.9 to Revision 1.0  Updated Table 9 on page 12. DSL random jitter from 2.1 ps RMS (typ) to 1.95 ps RMS (typ) and from "—" (max) to 2.2 ps RMS (max).  46 Added link to errata document. Updated "3.6.1. P5 and P6 Input Control" on page 24. Updated Figure 21 on page 31.  Updated Table 14 on page 23.  Added " Document Change List" on page 46. Removed down spread spectrum errata that has been corrected in revision B.  Updated ordering information to refer to revision B silicon.  Updated top marking explanation in Section 14.2.   Updated Table 10 on page 14.  Updated Table 7, “Crystal Specifications for 27 MHz,” on page 9. Corrected   typical additive jitter (12 kHz–20MHz) from 0.150 to 0.165 ps RMS. Updated Table 6, “Crystal Specifications for 25 MHz,” on page 9. Corrected  typical specifications for total jitter for PCI Express 1.1 Common clocked topology. Updated typical specifications for RMS jitter for PCI Express 2.1 Common clocked topology. Updated Updated Table 4, “Input and Output Clock Characteristics,” on page 6. Corrected  Updated core power supply specification in buffer mode. Updated Table 3, “Performance Characteristics,” on page 5. Updated Table 8 on page 10 and Table 9 on page 12. Corrected text in “9.2. Synchronous Frequency Translation” to match the capabilities of the ClockBuilder web utility. Rev. 1.4 ClockBuilder Pro One-click access to Timing tools, documentation, software, source code libraries & more. Available for Windows and iOS (CBGo only). www.silabs.com/CBPro Timing Portfolio www.silabs.com/timing SW/HW Quality Support and Community www.silabs.com/CBPro www.silabs.com/quality community.silabs.com Disclaimer Silicon Laboratories intends to provide customers with the latest, accurate, and in-depth documentation of all peripherals and modules available for system and software implementers using or intending to use the Silicon Laboratories products. Characterization data, available modules and peripherals, memory sizes and memory addresses refer to each specific device, and "Typical" parameters provided can and do vary in different applications. Application examples described herein are for illustrative purposes only. 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