8761CYILFT

Low Voltage, Low Skew, PCI / PCI-X Clock Generator 8761I Datasheet Description Features The 8761I is a low voltage, low skew PCI / PCI-X clock generator. The device has a selectable REF_CLK or crystal input. The REF_CLK input accepts LVCMOS or LVTTL input levels. The 8761I has a fully integrated PLL along with frequency configurable clock and feedback outputs for multiplying and regenerating clocks with “zero delay” Using a 20MHz or 25MHz crystal or a 33.333MHz or 66.666MHz reference frequency, the 8761I will generate output frequencies of 33.333MHz, 66.666MHz, 100MHz and 133.333MHz simultaneously. ▪ Fully integrated PLL ▪ Seventeen LVCMOS/LVTTL outputs, 15Ω typical output impedance ▪ Selectable crystal oscillator interface or LVCMOS/LVTTL REF_CLK ▪ Maximum output frequency: 166.67MHz ▪ Maximum crystal input frequency: 40MHz ▪ Maximum REF_CLK input frequency: 83.33MHz ▪ Individual banks with selectable output dividers for generating 33.333MHz, 66.66MHz, 100MHz and 133.333MHz simultaneously ▪ Separate feedback control for generating PCI / PCI-X frequencies from a 20MHz or 25MHz crystal or 33.333MHz or 66.666MHz reference frequency ▪ Cycle-to-cycle jitter: 70ps (maximum) ▪ Period jitter, RMS: 17ps (maximum) ▪ Output skew: 250ps (maximum) ▪ Bank skew: 50ps (maximum) ▪ Static phase offset: 0 ± 150ps (maximum) ▪ Full 3.3V or 3.3V core, 2.5V multiple output supply modes ▪ -40°C to 85°C ambient operating temperature ▪ Available in both standard and lead-free RoHS-compliant packages The low impedance LVCMOS/LVTTL outputs of the 8761I are designed to drive 50Ω series or parallel terminated transmission lines. Block Diagram ©2017 Integrated Device Technology, Inc. 1 October 31, 2017 8761I Datasheet Pin Assignments Figure 1. 10mm x 10mm x 1.4mm, 64-Lead TQFP (Top View Table 1. Pin Descriptions Type[a] Number Name 1 REF_CLK Input GND Power Power supply ground. 3, 4 XTAL1, XTAL2 Input Crystal oscillator interface. XTAL1 is the input. XTAL2 is the output. 5, 9, 40, 44 VDD Power Core supply pins. 6 XTAL_SEL Input Pullup 7 PLL_SEL Input Pullup 8 VDDA Power 10, 11 D_SELC0, D_SELC1 Input Pulldown 12 OEC Input Pullup Determines state of Bank C outputs. When HIGH, outputs are enabled. When LOW, outputs are disabled. LVCMOS / LVTTL interface levels. 13 OEA Input Pullup Determines state of Bank A outputs. When HIGH, outputs are enabled. When LOW, outputs are disabled. LVCMOS / LVTTL interface levels. 2, 16, 17, 21, 25, 29, 33, 48, 52, 56, 60, 64 ©2017 Integrated Device Technology, Inc. Pulldown Description Reference clock input. LVCMOS / LVTTL interface levels. Selects between crystal oscillator or reference clock as the PLL reference source. Selects XTAL inputs when HIGH. Selects REF_CLK when LOW. LVCMOS / LVTTL interface levels. Selects between PLL and bypass mode. When HIGH, selects PLL. When LOW, selects reference clock. LVCMOS / LVTTL interface levels. Analog supply pin. See Applications Note for filtering. Selects divide value for Bank C outputs as described in Table 3. LVCMOS / LVTTL interface levels. 2 October 31, 2017 8761I Datasheet Table 1. Pin Descriptions Type[a] Number Name 14, 15 D_SELA0, D_SELA1 Input 18, 20, 22, 24 QA0, QA1, QA2, QA3 Output Bank A clock outputs. 15Ω typical output impedance. LVCMOS / LVTTL interface levels. 19, 23 VDDOA Power Output supply pins for Bank A outputs. 26, 28, 30, 32 QB0, QB1, QB2, QB3 Output Bank B clock outputs. 15Ω typical output impedance. LVCMOS / LVTTL interface levels. 27, 31 VDDOB Power Output supply pins for Bank B outputs. 34, 35 D_SELB1, D_SELB0 Input Pulldown 36 OEB Input Pullup Determines state of Bank B outputs. When HIGH, outputs are enabled. When LOW, outputs are disabled. LVCMOS / LVTTL interface levels. 37 OED Input Pullup Determines state of Bank D outputs. When HIGH, outputs are enabled. When LOW, outputs are disabled. LVCMOS / LVTTL interface levels. 38, 39 D_SELD1, D_SELD0 Input Pulldown 41 MR Input Pulldown 42 FBDIV_SEL1 Input Pulldown Selects divider value for bank feedback output as described in Table 3. LVCMOS / LVTTL interface levels. 43 FBDIV_SEL0 Input Pullup Selects divider value for bank feedback output as described in Table 3. LVCMOS / LVTTL interface levels. 45 FB_IN Input Pulldown Feedback input to phase detector for generating clocks with “zero delay”. LVCMOS / LVTTL interface levels. 46 VDDOFB Power Output supply pin for FB_Out output. 47 FB_OUT Output Feedback output. Connect to FB_IN. 15Ù typical output impedance. LVCMOS / LVTTL interface levels. 49, 51, 53, 55 QD3, QD2, QD1, QD0 Output Bank D clock outputs. 15Ω typical output impedance. LVCMOS / LVTTL interface levels. 50, 54 VDDOD Power Output supply pins for Bank D outputs. 57, 59, 61, 63 QC3, QC2, QC1, QC0 Output Bank C clock outputs. 15Ω typical output impedance. LVCMOS / LVTTL interface levels. 58, 62 VDDOC Power Output supply pins for Bank C outputs. Pulldown Description Selects divider value for Bank A outputs as described in Table 3. LVCMOS / LVTTL interface levels. Selects divider value for Bank B outputs as described in Table 3. LVCMOS / LVTTL interface levels. Selects divider value for Bank D outputs as described in Table 3. LVCMOS / LVTTL interface levels. Active HIGH Master reset. When logic HIGH, the internal dividers are reset causing the outputs to go low. When logic LOW, the internal dividers and the outputs are enabled. LVCMOS / LVTTL interface levels. [a] Pullup and Pulldown refer to internal input resistors. See Table 2 for typical values. ©2017 Integrated Device Technology, Inc. 3 October 31, 2017 8761I Datasheet Table 2. Pin Characteristics Symbol Parameter Test Conditions Minimum Typical Maximum CIN Input Capacitance RPULLUP Input Pullup Resistor 51 kΩ RPULLDOWN Input Pulldown Resistor 51 kΩ VDD, VDDA = 3.465V; VDDOx = 3.465V 9 pF CPD Power Dissipation Capacitance (per output)[a] VDD, VDDA = 3.465V; VDDOx = 2.625V 11 pF ROUT 4 Units Output Impedance pF 15 Ω [a] VDDOx denotes VDDOA, VDDOB, VDDOC, VDDOD, VDDOFB. Table 3. Output Control Pin Function Inputs Outputs MR OEA OEB OEC OED QA0:QA3 QB0:QB3 QC0:QC3 QD0:QD3 1 1 1 1 1 LOW LOW LOW LOW 0 1 1 1 1 Active Active Active Active X 0 0 0 0 HiZ HiZ HiZ HiZ Table 4. Operating Mode Function Inputs PLL_SEL Operating Mode 0 Bypass 1 PLL Table 5. PLL Input Function Inputs XTAL_SEL PLL Input 0 REF_CLK 1 XTAL Oscillator ©2017 Integrated Device Technology, Inc. 4 October 31, 2017 8761I Datasheet Table 6. Control Functions Outputs Inputs[a] PLL_SEL = 1 Frequency D_SELx1 D_SELx0 FBDIV_SEL1 FBDIV_SEL0 Reference Frequency Range (MHz) 0 0 0 0 41.6 - 83.33 x2 83.33 - 166.67 41.6 - 83.33 0 0 0 1 20.83 - 41.67 x4 83.33 - 166.67 20.83 - 41.67 0 0 1 0 15.62 - 31.25 x 5.33 83.33 - 166.67 15.62 - 31.25 0 0 1 1 12.5 - 25 x 6.67 83.33 - 166.67 12.5 - 25 0 1 0 0 41.6 - 83.33 x 1.5 62.4 - 125 41.6 - 83.33 0 1 0 1 20.83 - 41.67 x3 62.4 - 125 20.83 - 41.67 0 1 1 0 15.62 - 31.25 x4 62.4 - 125 15.62 - 31.25 0 1 1 1 12.5 - 25 x5 62.4 - 125 12.5 - 25 1 0 0 0 41.6 - 83.33 x1 41.6 - 83.33 41.6 - 83.33 1 0 0 1 20.83 - 41.67 x2 41.6 - 83.33 20.83 - 41.67 1 0 1 0 15.62 - 31.25 x 2.67 41.6 - 83.33 15.62 - 31.25 1 0 1 1 12.5 - 25 x 3.33 41.6 - 83.33 12.5 - 25 1 1 0 0 41.6 - 83.33 ÷2 20.8 - 41.67 41.6 - 83.33 1 1 0 1 20.83 - 41.67 ÷1 20.8 - 41.67 20.83 - 41.67 1 1 1 0 15.62 - 31.25 x 1.33 20.8 - 41.67 15.62 - 31.25 1 1 1 1 12.5 - 25 x 1.67 20.8 - 41.67 12.5 - 25 QX0:QX3 QX0:QX3 (MHz) FB_OUT (MHz) [a] D_SELX1 denotes D_SELA1, D_SELB1, D_SELC1, and D_SELD1. D_SELX0 denotes D_SELA0, D_SELB0, D_ SELC0, and D_SELD0. QX0:QX3 denotes QA0:QA3, QB0:QB3, QC0:QC3, and QD0:QD3. ©2017 Integrated Device Technology, Inc. 5 October 31, 2017 8761I Datasheet Table 7. Control Functions – PCI Configuration Outputs Inputs[a] PLL_SEL = 1 Frequency D_SELx1 D_SELx0 FBDIV_SEL1 FBDIV_SEL0 Reference Frequency (MHz) 0 0 0 0 66.67 x2 133 66.67 0 0 0 1 33.33 x4 133 33.33 0 0 1 0 25 x 5.33 133 25 0 0 1 1 20 x 6.67 133 20 0 1 0 0 66.67 x 1.5 100 66.67 0 1 0 1 33.33 x3 100 33.33 0 1 1 0 25 x4 100 25 0 1 1 1 20 x5 100 20 1 0 0 0 66.67 x1 66.67 66.67 1 0 0 1 33.33 x2 66.67 33.33 1 0 1 0 25 x 2.67 66.67 25 1 0 1 1 20 x 3.33 66.67 20 1 1 0 0 66.67 ÷2 33.33 66.67 1 1 0 1 33.33 ÷1 33.33 33.33 1 1 1 0 25 x 1.33 33.33 25 1 1 1 1 20 x 1.67 33.33 20 QX0:QX3 QX0:QX3 (MHz) FB_OUT (MHz) [a] D_SELX1 denotes D_SELA1, D_SELB1, D_SELC1, and D_SELD1. D_SELX0 denotes D_SELA0, D_SELB0, D_ SELC0, and D_SELD0. QX0:QX3 denotes QA0:QA3, QB0:QB3, QC0:QC3, and QD0:QD3. ©2017 Integrated Device Technology, Inc. 6 October 31, 2017 8761I Datasheet Absolute Maximum Ratings The absolute maximum ratings are stress ratings only. Stresses greater than those listed below can cause permanent damage to the device. Functional operation of the 8761I at absolute maximum ratings is not implied. Exposure to absolute maximum rating conditions may affect device reliability. Table 8. Absolute Maximum Ratings Symbol Parameter Conditions Minimum Maximum Units 4.6 V VDD Supply Voltage V1 Inputs -0.5V VDD + 0.5 V V V0 Outputs -0.5V VDDx + 0.5 V V θJA Package Thermal Impedance 41.1 (0 lfpm) °C/W TSTG Storage Temperature 150 °C -65 DC Characteristics Table 9. Power Supply DC Characteristics, VDD = VDDA = VDDOX = 3.3V ±5% or 2.5V ±5%, TA = -40° to 85°C Symbol Parameter Conditions Minimum Typical Maximum Units VDD Core Supply Voltage 3.135 3.3 3.465 V VDDA Analog Supply Voltage 3.135 3.3 3.465 V 3.135 3.3 3.465 V 2.375 2.5 2.625 V 175 mA 55 mA 25 mA VDDOx Output Supply Voltage[a] IDD Power Supply Current IDDA Analog Supply Current IDDOx Output Supply Current [b] [a] VDDOx denotes VDDOA, VDDOB, VDDOC, VDDOD, VDDOFB. [b] IDDOx denotes IDDOA, IDDOB, IDDOC, IDDOD, IDDOFB. ©2017 Integrated Device Technology, Inc. 7 October 31, 2017 8761I Datasheet Table 10. LVCMOS/LVTTL DC Characteristics, VDD = VDDA = 3.3V ±5%, VDDX = 3.3V ±5% or 2.5V ±5%, TA = -40° to 85°C Symbol VIH VIL IIH IIL Parameter Input High Voltage Input Low Voltage Input High Current Input Low Current Test Conditions Minimum Typical Maximum Units OEA:OED, XTAL_SEL, MR, D_ SELAx, D_SELBx, FB_IN, D_SELCx, D_SELDx, PLL_SEL, FBDIV_SEL0, FBDIV_SEL1 2 VDD + 0.3 V REF_CLK 2 VDD + 0.3 V OEA:OED, XTAL_SEL, MR, D_ SELAx, D_SELBx, FB_IN, D_SELCx, D_SELDx, PLL_SEL, FBDIV_SEL0, FBDIV_SEL1 -0.3 0.8 REF_CLK -0.3 1.3 D_SELAx, D_SELBx, FB_IN, MR, D_SELCx, D_SELDx, REF_CLK, FBDIV_SEL1 VDD = VIN = 3.465V or 150 2.625V V V µA XTAL_SEL, PLL_SEL, FBDIV_ SEL0, OEA:OED VDD = VIN = 3.465V or D_SELAx, D_SELBx, FB_IN, MR, D_SELCx, D_SELDx, REF_CLK, FBDIV_SEL1 VDD = 3.465V or 2.625V, VIN = 0V -5 XTAL_SEL, PLL_SEL, FBDIV_ SEL0, OEA:OED VDD = 3.465V or 2.625V, VIN = 0V -150 µA VDDOx = 3.465V 2.6 V VDDOx = 2.625V 1.8 VOH Output High Voltage[a] VOL Output Low Voltage[a] IOZL Output Tristate Current Low IOZH Output Tristate Current High 5 2.625V µA µA VDDOx = 3.465V or 2.625V 0.5 -5 V µA 5 µA [a] Outputs terminated with 50Ω to VDDOx /2. For more information, see “Output Load Test Circuit” in Parameter Measurement Information. Table 11. Crystal Characteristics Parameter Test Conditions Minimum Mode of Oscillation Typical Units 38 MHz 70 Ω Fundamental Frequency 10 Equivalent Series Resistance (ESR) Shunt Capacitance 7 Drive Level ©2017 Integrated Device Technology, Inc. Maximum pF 1 8 mW October 31, 2017 8761I Datasheet Table 12. Crystal Characteristics Parameter Test Conditions Reference Frequency fREF Minimum Typical 12.5 Maximum Units 83.33 MHz Maximum Units 166.67 MHz 150 ps Table 13. AC Characteristics, VDD = VDDA = VDDOx = 3.3V ±5%, TA = -40° to 85°C Symbol Parameter fMAX Output Frequency t(Ø) Static Phase Offset; Note 1, 7 Test Conditions f = 50MHz Minimum Typical -150 tsk(b) Bank Skew; Note 2, 6 50 ps tsk(o) Output Skew; Note 3, 6 250 ps f = 50MHz; Note 4, 7 70 ps f = 25MHz XTAL, 133.3MHz out 190 ps Period Jitter, RMS; Note 4, 6, 7, 8 17 ps PLL Lock Time 1 ms 250 800 ps 45 55 % tjit(cc) tjit(per) tL tR / tF odc Cycle-to-Cycle Jitter; 6 Output Rise/Fall Time 20 to 80% Output Duty Cycle; Note 5, 7 Note 1: Defined as the time difference between the input reference clock and the average feedback input signal when the PLL is locked and the input reference frequency is stable. Measured from VDD /2 of the input to VDDOx /2 of the output. Note 2: Defined as skew within a bank of outputs at the same voltages and with equal load conditions. Note 3: Defined as skew between outputs at the same supply voltage and with equal load conditions. Measured at VDDOx /2. Note 4: Jitter performance using LVCMOS inputs. Note 5: Measured using REF_CLK. For XTAL input, refer to Application Note. Note 6: This parameter is defined in accordance with JEDEC Standard 65. Note 7: Tested with D_SELXX =10 (divide by 6); FBDIV_SEL = 00 (divide by 6). Note 8: This parameter is defined as an RMS value. ©2017 Integrated Device Technology, Inc. 9 October 31, 2017 8761I Datasheet Table 14. AC Characteristics, VDD = VDDA = 3.3V ±5%, VDDOx = 2.5V ±5%, TA = -40° to 85°C Symbol Parameter fMAX Output Frequency t(Ø) Static Phase Offset; Note 1, 7 Test Conditions f = 50MHz Minimum Typical -350 Maximum Units 166.67 MHz 20 ps tsk(b) Bank Skew; Note 2, 6 50 ps tsk(o) Output Skew; Note 3, 6 250 ps f = 50MHz; Note 4, 7 70 ps f = 25MHz XTAL, 133.3MHz out 190 ps tjit(cc) Cycle-to-Cycle Jitter; Note 6 tjit(per) Period Jitter, RMS; Note 4, 6, 7, 8 17 ps PLL Lock Time 1 ms 250 800 ps 45 55 % tL tR / tF odc Output Rise/Fall Time 20 to 80% Output Duty Cycle; Note 5, 7 Note 1: Defined as the time difference between the input reference clock and the average feedback input signal when the PLL is locked and the input reference frequency is stable. Measured from VDD /2 of the input to VDDOx /2 of the output. Note 2: Defined as skew within a bank of outputs at the same voltages and with equal load conditions. Note 3: Defined as skew between outputs at the same supply voltage and with equal load conditions. Measured at VDDOx /2. Note 4: Jitter performance using LVCMOS inputs. Note 5: Measured using REF_CLK. For XTAL input, refer to Application Note. Note 6: This parameter is defined in accordance with JEDEC Standard 65. Note 7: Tested with D_SELXX =10 (divide by 6); FBDIV_SEL = 00 (divide by 6). Note 8: This parameter is defined as an RMS value. ©2017 Integrated Device Technology, Inc. 10 October 31, 2017 8761I Datasheet Parameter Measurement Information Figure 2. 3.3V Core/3.3V Output Load AC Test Circuit Figure 3. 3.3V Core/2.5V Output Load AC Test Circuit Figure 4. Output Skew Figure 5. Bank Skew (Where X denotes outputs in the same bank) Figure 6. Cycle-to-Cycle Jitter Figure 7. Static Phase Offset Figure 8. Output Duty Cycle/Pulse Width/Period Figure 9. Output Rise/Fall Time ©2017 Integrated Device Technology, Inc. 11 October 31, 2017 8761I Datasheet Application Information Power Supply Filtering Techniques As in any high speed analog circuitry, the power supply pins are vulnerable to random noise. The 8761I provides separate power supplies to isolate any high switching noise from the outputs to the internal PLL. VDD, VDDA, and VDDOx should be individually connected to the power supply plane through vias, and bypass capacitors should be used for each pin. To achieve optimum jitter performance, power supply isolation is required. Figure 10 illustrates how a ferrite bead along with a 10µF and a 0.01 F bypass capacitor should be connected to each V. DDA Figure 10. Power Supply Filtering Crystal Input Interface The 8761I crystal interface is shown in Figure 11. While layout the PC Board, it is recommended to provide C1 and C2 spare footprints for frequency fine tuning. For an 18pF parallel resonant crystal, the C1 and C2 are expected to be ~10pF and ~5pF respectively. Figure 11. Crystal Input Interface Recommended for Unused Input and Output Pins Inputs Crystal Input For applications not requiring the use of the crystal oscillator input, both XTAL_IN and XTAL_OUT can be left floating. Though not required, but for additional protection, a 1kΩ resistor can be tied from XTAL_IN to ground. REF_CLK Input For applications not requiring the use of the reference clock, it can be left floating. Though not required, but for additional protection, a 1kΩ resistor can be tied from the REF_CLK to ground. LVCMOS Control Pins All control pins have internal pull-ups or pull-downs; additional resistance is not required but can be added for additional protection. A 1kΩ resistor can be used. ©2017 Integrated Device Technology, Inc. 12 October 31, 2017 8761I Datasheet Outputs LVCMOS Output All unused LVCMOS output can be left floating. We recommend that there is no trace attached. Schematic Example Figure 12 shows a schematic example of the 8761I. In this example, the input is driven by an 18pF parallel crystal. The de- coupling capacitors should be physically located near the power pin. For 8761I, the unused clock outputs can be left floating. The optional C1 and C2 are spare footprints for frequency fine tuning. Figure 12. Schematic Example ©2017 Integrated Device Technology, Inc. 13 October 31, 2017 8761I Datasheet Reliability Information Table 15. JA versus Air Flow Table for 64 Lead TQFP JA by Velocity (Linear Feet per Minute)[a] 0 1 2 Unit Single-Layer PCB, JEDEC Standard Test Boards 58.8 48.5 43.2 °C/W Multi-Layer PCB, JEDEC Standard Test Boards 41.1 35.8 33.6 °C/W [a] Most modern PCB designs use multi-layered boards. The data in the second row pertains to most designs. Transistor Count The transistor count for the 8761I is 6040. ©2017 Integrated Device Technology, Inc. 14 October 31, 2017 8761I Datasheet Package Outline Drawings Figure 13. Package Outline Drawings – Page 1 ©2017 Integrated Device Technology, Inc. 15 October 31, 2017 8761I Datasheet Figure 14. Package Outline Drawings – Page 2 ©2017 Integrated Device Technology, Inc. 16 October 31, 2017 8761I Datasheet Ordering Information Orderable Part Number Marking Package Carrier Type Temperature 8761CYILF ICS8761CYILF 64 lead “Lead Free” TQFP Tray -40°C to +85°C 8761CYILFT ICS8761CYILF 64 lead “Lead Free” TQFP Tape and Reel -40°C to +85°C Revision History Revision Date Description of Change October 31, 2017 Fixed an incorrect part number. October 16, 2017 ▪ Changed LQFP references to TQFP. ▪ Updated the packaging information; however, no mechanical differences. ▪ Completed minor changes throughout the document January 25, 2016 ▪ Removed ICS from part numbers where needed. Features Section - removed reference to leaded package. ▪ Ordering Information - removed quantity from tape and reel. Deleted LF note below the table. ▪ Updated header and footer. July 27, 2010 ▪ Updated the header/footer with IDT from ICS. Removed ICS prefix from Part/Order Number column. Added Contact Page. January 13, 2006 ▪ ▪ ▪ ▪ ▪ ▪ ▪ October 5, 2004 ▪ Features Section - added Lead-Free bullet. Added Crystal Section. ▪ Ordering Information Table - added Lead-Free Part Number. Updated format throughout the datasheet. Pin Characteristics Table - changed C from 4pF max. to 4pF typical. Crystal Characteristics Table - added Drive Level. Power Supply Filtering Techniques - corrected last sentence in the paragraph Corrected Power Supply Filtering diagram. Added Recommendations for Unused Input and Output Pins. Corrected Schematic Example diagram. Ordering Information Table - added Lead-Free note. 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