MK1493-05GILFTR

DATASHEET MK1493-05 DIFFERENTIAL SPREAD SPECTRUM CLOCK DRIVER Description Features The MK1493-05 is a spread-spectrum clock generator used as a companion chip with a CK410 system clock. The device is used in a PC or embedded system to substantially reduce electro-magnetic interference (EMI). The device provides a differential spread-spectrum high frequency output and a reference output clock. An SMBus is connected to the CK410 for command and control of the MK1493-05. The input reference clock to the MK1493-05 comes directly from the CK410. No external, expensive crystal or crystal oscillator is required. • • • • • • • • • • A 16-pin TSSOP package is employed to maximize board space utilization. Packaged in 16-pin TSSOP package Pb (lead) free package Single differential spread spectrum clock Spread spectrum for EMI control Supports SMBUS index read/write and blocks read/write operations Uses external 14.31818 MHz clock from CK410 Low output jitter design Power down mode lowers Idd Spread selection via hardware pins (down and center) Industrial temperature range available (-40°C to +85°C) Block Diagram VDD 2 3 SEL[3:1] PLL Clock Synthesis Control Logic SDATA SCLK Config. Reg. Spread Spectrum Circuitry PWRDN CLKIN CLKOUT CLKOUT REFOUT/SEL Clock Buffer 3 IREF VSS IDT™ DIFFERENTIAL SPREAD SPECTRUM CLOCK DRIVER 1 MK1493-05 REV J 051310 MK1493-05 DIFFERENTIAL SPREAD SPECTRUM CLOCK DRIVER CLOCK SYNTHESIZER Pin Assignment CLKIN 1 16 VDDA S3 2 15 VSSA S2 3 14 IREF S1 4 13 VSSIREF PWRDWN 5 12 CLKOUT REF/SEL 6 11 CLKOUT SCLK 7 10 VSS SDATA 8 9 VDD 16 Pin 173 Mil (0.65mm) TSSOP Spread Spectrum Selection Table S3 S2 S1 S0 Spread% Spread Type 0 0 0 0 0.8 Down 0 0 0 1 1.0 Down 0 0 1 0 1.25 Down 0 0 1 1 1.5 Down 0 1 0 0 1.75 Down 0 1 0 1 2.0 Down 0 1 1 0 2.5 Down 0 1 1 1 3.0 Down 1 0 0 0 +0.3 Center 1 0 0 1 +0.4 Center 1 0 1 0 +0.5 Center 1 0 1 1 +0.6 Center 1 1 0 0 +0.8 Center 1 1 0 1 +1.0 Center 1 1 1 0 +1.25 Center 1 1 1 1 +1.5 Center The spread enable and spread select[3:0] SMBus register bits control spread modulation and enable/disable. The CLKIN clock input and REF clock output will not have or be spread. At device power-up the spread-spectrum is enabled and hardware control is enabled. The S0 configuration bit is hard-coded to zero when hardware control mode is selected. IDT™ DIFFERENTIAL SPREAD SPECTRUM CLOCK DRIVER 2 MK1493-05 REV J 051310 MK1493-05 DIFFERENTIAL SPREAD SPECTRUM CLOCK DRIVER CLOCK SYNTHESIZER Pin Descriptions Pin Pin Name Pin Type 1 CLKIN Input 14.31818 MHz single-ended clock input. 2 S3 Input Spread spectrum select pin #3. See table above. Internal pull-down. 3 S2 Input Spread spectrum select pin #2. See table above. Internal pull-down. 4 S1 Input Spread spectrum select pin #1. See table above. Internal pull-down. 5 PWRDN Input Power down pin. Active high. Internal pull-down. 6 REF/SEL I/O 7 SCLK Input SMBus compatible clock. 8 SDATA I/O SMBus compatible data. 9 VDD Power +3.3 V power supply for logic and outputs. Pin Description Strap input for selecting CLKOUT frequency and 14.31818 MHz reference clock. 10 VSS Power Ground for logic and outputs. 11 CLKOUT Output Selectable 96/100 MHz spread spectrum differential clock output. 12 CLKOUT Output Selectable 96/100 MHz spread spectrum differential clock output. 13 VSSIREF Power Ground for current reference. 14 IREF Input Precision resistor attached to this pin is connected to the internal current reference. 15 VSSA Power Ground for PLL. 16 VDDA Power +3.3 V power supply for PLL. IDT™ DIFFERENTIAL SPREAD SPECTRUM CLOCK DRIVER 3 MK1493-05 REV J 051310 MK1493-05 DIFFERENTIAL SPREAD SPECTRUM CLOCK DRIVER CLOCK SYNTHESIZER General SMBus Serial Interface How to Write: How to Read: • • • • • • • • • • • • • • • • • • • • • Controller (host) sends a start bit Controller (host) sends the write address D4(H) IDT clock will acknowledge Controller (host) sends the beginning byte location =N IDT clock will acknowledge Controller (host) sends the data byte count = X IDT clock will acknowledge Controller (host) starts sending Byte N through Byte N + X - 1 (see Note 2) IDT clock will acknowledge each byte one at a time Controller (host) sends a Stop bit • • • Controller (host) sends a start bit Controller (host) sends the write address D4(H) IDT clock will acknowledge Controller (host) sends the beginning byte location =N IDT clock will acknowledge Controller (host) will send a separate start bit Controller (host) sends the read address D5(H) IDT clock will acknowledge Controller (host) sends the data byte count = X IDT clock sends Byte N + X - 1 IDT clock sends Byte 0 through byte X (if X(H) was written to byte 8) Controller (host) will need to acknowledge each byte Controller (host) will send a not acknowledge bit Controller (host) will send a stop bit Index Block Read Operation Index Block Write Operation IDT (Slave/Receiver) Controller (Host) T T starTbit Slave Address D4(H) starTbit Slave Address D4H) WR IDT (Slave/Receiver) Controller (Host) WR WRite ACK WRite ACK Beginning Byte = N ACK Beginning Byte = N ACK RT ACK Beginning Byte = N O O ReaD RD ACK . X B Y T E O Repeat starT Slave Address D5(H) Data Byte Count = X ACK Data Bye Count = X O ACK O . O ACK ACK O Byte N + X - 1 P stoP bit O O X B Y T E Beginning Byte N O O O Byte N + X - 1 IDT™ DIFFERENTIAL SPREAD SPECTRUM CLOCK DRIVER 4 N Not acknowledge P stoP bit MK1493-05 REV J 051310 MK1493-05 DIFFERENTIAL SPREAD SPECTRUM CLOCK DRIVER CLOCK SYNTHESIZER SMBus Address The MK1493-05 is a slave-only device that supports block read and block write protocol using a single 7 bit address and read/write bit. A block write (D4h) or block read (D5h) is made up of seven (7) bits and one (1) read/write bit. A6 A5 A4 A3 A2 A1 A0 R/W# 1 1 0 1 0 1 0 X The applications where the indexed block write and block are used, the dummy byte (bit 11-18) functions as a register-offset (8 bits) pointer. Byte 0: Control Register Bit Description Type Output(s) Affected Notes RW Power Up Condition 0 7 Spread Select 0 CLKOUT, CLKOUT 1,2,3 6 Spread Select 1 RW S1 CLKOUT, CLKOUT 1,2,3 5 Spread Select 2 RW S2 CLKOUT, CLKOUT 1,2,3 4 Spread Select 3 RW S3 CLKOUT, CLKOUT 1,2,3 3 Select Output Frequency, 1=100 MHz, 0=96 MHz RW SEL 100/96 CLKOUT, CLKOUT 1,2 2 Reserved, must be written as 0 RW 0 Not applicable 1 1 Spread spectrum enable, 0=spread OFF, 1=spread ON RW 1=spread ON CLKOUT, CLKOUT 1 0 Hardware/Software control of spread enable, S[3:0], and output frequency. 0=h.w cinttrol, 1=s/w control RW 0=h/w control Not applicable IDT™ DIFFERENTIAL SPREAD SPECTRUM CLOCK DRIVER 5 MK1493-05 REV J 051310 MK1493-05 DIFFERENTIAL SPREAD SPECTRUM CLOCK DRIVER CLOCK SYNTHESIZER Byte 1: Control Register Bit Description Type Output(s) Affected R Power Up Condition Undefined 7 Reserved, must be written as 0 6 Reserved, must be written as 0 R Undefined Not applicable 5 Reserved, must be written as 0 R Undefined Not applicable 4 Reserved, must be written as 0 R Undefined Not applicable 3 Reserved, must be written as 0 R Undefined Not applicable 2 CLKOUT enable, 0=disable, 1=enabled RW 1=enabled Not applicable 1 Reserved, must be written as 0 R Undefined Not applicable 0 Reserved, must be written as 0 R Undefined Not applicable Power Up Condition Undefined Output(s) Affected Notes Not applicable Byte 2 through 5: Control Bit Description Type 7 to 0 Reserved, must be written as 0 R IDT™ DIFFERENTIAL SPREAD SPECTRUM CLOCK DRIVER 6 Notes Not applicable MK1493-05 REV J 051310 MK1493-05 DIFFERENTIAL SPREAD SPECTRUM CLOCK DRIVER CLOCK SYNTHESIZER Byte 6: Control Register Bit Description Type Power Up Output(s) Affected Notes 7 Revision ID bit 3 R -- Not applicable 6 Revision ID bit 2 R -- Not applicable 5 Revision ID bit 1 R -- Not applicable 4 Revision ID bit 0 R -- Not applicable 3 Vendor ID bit 3 R -- Not applicable 4 2 Vendor ID bit 2 R -- Not applicable 4 1 Vendor ID bit 1 R -- Not applicable 4 0 Vendor ID bit 0 R -- Not applicable 4 Notes: 1. These bits are read-only when the hardware/software bit is set to hardware control. 2. When the hardware/software bit is set to hardware control these bits reflect the state of the S[3:1] and SEL100/96# pins and the SO bit is set to zero. When the hardware/software bit is set to software control the S[3:1] and SEL100/96# pins are overridden by these bits. 3. See Spread Spectrum Selection Table on page 2 for spread selection options. 4. Use the same vendor ID as is used for the CK408 clock chip. Power Down Mode Operation The Power Down pin is used to shut off the clock cleanly prior to shutting off power to the device. The power down pin is an active high asynchronous input. When PWRDWN is sampled low for two output clock periods then all clocks need to be stopped prior to turning off the VCO. ALL clocks need to be stopped in a predictable manner. PW RDN C LK IN C LK V C O ON O FF C LK O U T/ TpH Z C LKO U T R E FO U T CLKOUT is driven differentially when PWRDWN# is de-asserted unless the CLKOUT is disabled through the SMBus register bit. IDT™ DIFFERENTIAL SPREAD SPECTRUM CLOCK DRIVER 7 MK1493-05 REV J 051310 MK1493-05 DIFFERENTIAL SPREAD SPECTRUM CLOCK DRIVER CLOCK SYNTHESIZER PWRDN/ De-Assertion, CLKIN Already Running VDD PWRDN CLKIN CLK VCO OFF STARTING STABLE Tstable CLKOUT TpZH CLKOUT/ REFOUT CLKIN must have a stable clock input when PWRDN is de-asserted. If CLKIN starts after PWRDN is de-asserted then Tstable specification applies to when CLKIN is ON. If CLKIN is full ON before PWRDN is de-asserted then the Tstable specification applies. PWRDN/ De-Assertion, CLKIN Not Yet Running VDD PWRDN CLKIN CLK VCO OFF STARTING Tstable CLKOUT/ CLKOUT STABLE TpZH REFOUT IDT™ DIFFERENTIAL SPREAD SPECTRUM CLOCK DRIVER 8 MK1493-05 REV J 051310 MK1493-05 DIFFERENTIAL SPREAD SPECTRUM CLOCK DRIVER CLOCK SYNTHESIZER Application Information Series Termination Resistor the component side of the board as close to the VDD pin as possible. No vias should be used between decoupling capacitor and VDD pin. The PCB trace to VDD pin should be kept as short as possible, as should the PCB trace to the ground via. Distance of the ferrite bead and bulk decoupling from the device is less critical. Clock output traces should use series termination. To series terminate a 50Ω trace (a commonly used trace impedance), place a 33Ω resistor in series with the clock line, as close to the clock output pin as possible. The nominal impedance of the clock output is 20Ω. 2) To minimize EMI, and obtain the best signal integrity, the 33Ω series termination resistor should be placed close to the clock output. Decoupling Capacitors As with any high-performance mixed-signal IC, the MK1493-05 must be isolated from system power supply noise to perform optimally. 3) An optimum layout is one with all components on the same side of the board, minimizing vias through other signal layers (the ferrite bead and bulk decoupling capacitor can be mounted on the back). Other signal traces should be routed away from the MK1493-05. Decoupling capacitors of 0.01µF must be connected between each VDD and the PCB ground plane. PCB Layout Recommendations This includes signal traces just underneath the device, or on layers adjacent to the ground plane layer used by the device. For optimum device performance and lowest output phase noise, the following guidelines should be observed. 1) Each 0.01µF decoupling capacitor should be mounted on Absolute Maximum Ratings Stresses above the ratings listed below can cause permanent damage to the MK1493-05. These ratings are stress ratings only. Functional operation of the device at these or any other conditions above those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods can affect product reliability. Electrical parameters are guaranteed only over the recommended operating temperature range. Item Rating Supply Voltage, VDD, VDDA 5.5 V All Inputs and Outputs -0.5 V to VDD+0.5 V Ambient Operating Temperature 0 to +70° C Storage Temperature -65 to +150° C Junction Temperature 125° C Soldering Temperature 260° C ESD Protection (Input) 2000 V min. (HBM) IDT™ DIFFERENTIAL SPREAD SPECTRUM CLOCK DRIVER 9 MK1493-05 REV J 051310 MK1493-05 DIFFERENTIAL SPREAD SPECTRUM CLOCK DRIVER CLOCK SYNTHESIZER Electrical Characteristics - DC Unless stated otherwise, VDD = 3.3 V ±5%, Ambient Temperature -40 to +85° C Parameter Symbol Supply Voltage Input High Voltage2 Input Low Voltage 2 3 Conditions Min. Typ. Max. Units V 3.135 3.465 VIH 2.0 VDD +0.3 V VIL VSS-0.3 0.8 V 5 µA Input Leakage Current IIL 0 < Vin < VDD -5 Output High Voltage2 VOH IOH = -1 mA 2.4 2 VOH IOH = 1 mA IoH CLKOUT, Voh@Z=0.7 V@50 ohms IDD No load 55 mA No load, input low 400 µA Input pin capacitance 7 pF Output pin capacitance 6 pF 5 nH Output Low Voltage 5 Output Current Operating Supply Current IDDPD Input Capacitance Output Capacitance CIN COUT V 0.4 6*Iref V +12% x I Pin Inductance LPIN Output Resistance Rout CLKOUT 1,4 Pull-up Resistor Rpu Real time, asynchronous assertion 120 kΩ Pull-down Resistor1,4 Rpd Real time, asynchronous assertion 120 kΩ 3.0 1Includes ±50K ohm internal. 2Single edge is monotonic when transitioning through region. 3Inputs with pull-ups/-downs are not included. 4Internal leakage to ground is less than equal to 5 uA to ensure high level 5Configuration is Rr=475 ohms at 1%. Iref=2.32 mA. Iref=VDD/(3 x Rr). kΩ if input is floating. Electrical Characteristics - CLKIN/REFOUT Unless stated otherwise, VDD = 3.3 V ±5%, Ambient Temperature -40 to +85° C Parameter Symbol Conditions Min. Typ. Max. Units Rise Time tRISE from 0.8 V to 2.0 V 500 1200 ps Fall Time tFALL from 2.0 V to 0.8 V 500 1200 ps Rising Edge 1.0 4.0 V/ns Falling Edge 1.0 4.0 V/ns Edge Rate Edge Rate Duty Cycle 1 40 Jitter, Cycle-to-Cycle1 Accuracy 1 Long Term Accuracy 60 % 1000 ps 300 ppm Measured from VDD/2. IDT™ DIFFERENTIAL SPREAD SPECTRUM CLOCK DRIVER 10 MK1493-05 REV J 051310 MK1493-05 DIFFERENTIAL SPREAD SPECTRUM CLOCK DRIVER CLOCK SYNTHESIZER Electrical Characteristics - CLKOUT Unless stated otherwise, VDD=3.3 V ±5%, Ambient Temperature -40 to +85° C Parameter Voltage1,2 Low Voltage1,2 High Symbol Conditions Min. Typ. Max. Units VH 660 700 850 mV VL -150 0 Crossing Point Voltage1,2 absolute Crossing Point Voltage1,2,4 variation over all edges 250 Jitter, Cycle-to-Cycle1,3 Modulation Frequency Rise Time1,2 spread spectrum mV 550 mV 140 mV 80 ps 32.5 kHz tRISE from 0.175 V to 0.525 V. Rising edge CLKOUT and falling edge CLKOUT/. 175 700 ps tFALL from 2.0 V to 0.8 V 175 700 ps Rise/Fall Time Variation1,2 125 ps Rise/Fall Time Matching1,2 20 % 45 55 % -0.3 Vhigh+0. 3 V Fall Time1,2 Duty Cycle1,3 Output Voltage Variation1,2 1Test undershoot, overshoot setup is Rs=33.2 ohms, Rp=49.9 ohms with 2 pF. 2Measurement taken from a single-ended waveform. 3Measurement taken from a differential waveform 4Measured at the crossing point where instantaneous voltages of both CLKOUT and CLKOUT/ are equal IDT™ DIFFERENTIAL SPREAD SPECTRUM CLOCK DRIVER 11 MK1493-05 REV J 051310 MK1493-05 DIFFERENTIAL SPREAD SPECTRUM CLOCK DRIVER CLOCK SYNTHESIZER Electrical Characteristics - AC Unless stated otherwise, VDD = 3.3 V ±5%, Ambient Temperature -40 to +85° C, CL= 15 pF Parameter Symbol Conditions Output Enable Time1 TpZL,TpZH All outputs 1 TpLZ,TpHZ All outputs Output Disable Time Stabilization Time 2 Spread Change Time Min. Typ. 600 Max. Units 10 us 1200 ps Tstable from power-up 3.0 ms Tspread Settling period after spread change 3.0 ms 1 CLKOUT and SMBus pins are tri-stated when PWRDN/ is asserted. CLKOUT is driven differential when PWRDN/ is de-asserted unless its already disabled. 2 The period is when VDD equals its typical VDD condition. Measurement Diagrams Measurement diagram for duty cycle and jitter. TPERIOD High Duty Cycle % Low Duty Cycle % 1.5V Current Reference Source (Iref) If board target trace impedance (Z) is 50Ω, then Rr = 475Ω (1%), providing IREF of 2.32 mA, output current (IOH) is equal to 6*IREF. Thermal Characteristics Parameter Symbol Thermal Resistance Junction to Ambient Thermal Resistance Junction to Case IDT™ DIFFERENTIAL SPREAD SPECTRUM CLOCK DRIVER Conditions Min. Typ. Max. Units θJA Still air 78 ° C/W θJA 1 m/s air flow 70 ° C/W θJA 3 m/s air flow 68 ° C/W 37 ° C/W θJC 12 MK1493-05 REV J 051310 MK1493-05 DIFFERENTIAL SPREAD SPECTRUM CLOCK DRIVER CLOCK SYNTHESIZER Package Outline and Package Dimensions (16-pin TSSOP, 4.40 mm Body, 0.65 mm Pitch) Package dimensions are kept current with JEDEC Publication No. 95, MO-153 Millimeters 16 Symbol E1 A A1 A2 b C D E E1 e L α aaa E INDEX AREA 1 2 D Min Inches Max -1.20 0.05 0.15 0.80 1.05 0.19 0.30 0.09 0.20 4.90 5.1 6.40 BASIC 4.30 4.50 0.65 Basic 0.45 0.75 0° 8° -0.10 Min Max -0.047 0.002 0.006 0.032 0.041 0.007 0.012 0.0035 0.008 0.193 0.201 0.252 BASIC 0.169 0.177 0.0256 Basic 0.018 0.030 0° 8° -0.004 A A2 A1 c -Ce SEATING PLANE b L aaa C Ordering Information Part / Order Number Marking Shipping packaging Package Temperature MK1493-05GLF 149305GL Tubes 16-pin TSSOP 0 to +70° C MK1493-05GLFTR 149305GL Tape and Reel 16-pin TSSOP 0 to +70° C MK1493-05GLN 149305GN Tubes 16-pin TSSOP 0 to +70° C MK1493-05GLNTR 149305GN Tape and Reel 16-pin TSSOP 0 to +70° C MK1493-05GILF 49305GIL Tubes 16-pin TSSOP -40 to +85° C MK1493-05GILFTR 49305GIL Tape and Reel 16-pin TSSOP -40 to +85° C While the information presented herein has been checked for both accuracy and reliability, Integrated Device Technology (IDT) assumes no responsibility for either its use or for the infringement of any patents or other rights of third parties, which would result from its use. No other circuits, patents, or licenses are implied. This product is intended for use in normal commercial applications. Any other applications such as those requiring extended temperature range, high reliability, or other extraordinary environmental requirements are not recommended without additional processing by IDT. IDT reserves the right to change any circuitry or specifications without notice. IDT does not authorize or warrant any IDT product for use in life support devices or critical medical instruments. IDT™ DIFFERENTIAL SPREAD SPECTRUM CLOCK DRIVER 13 MK1493-05 REV J 051310 MK1493-05 DIFFERENTIAL SPREAD SPECTRUM CLOCK DRIVER CLOCK SYNTHESIZER Innovate with IDT and accelerate your future networks. Contact: www.IDT.com For Sales For Tech Support 800-345-7015 408-284-8200 Fax: 408-284-2775 www.idt.com/go/clockhelp Corporate Headquarters Integrated Device Technology, Inc. www.idt.com © 2006 Integrated Device Technology, Inc. All rights reserved. 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