IDTCSPUA877A 1.8V PLL DIFFERENTIAL 1:10 SDRAM CLOCK DRIVER COMMERCIAL TEMPERATURE RANGE 1.8V PHASE LOCKED LOOP DIFFERENTIAL 1:10 SDRAM CLOCK DRIVER IDTCSPUA877A DESCRIPTION: FEATURES: The CSPUA877A is a PLL based clock driver that acts as a zero delay buffer to distribute one differential clock input pair(CLK, CLK ) to 10 differential output pairs (Y [0:9], Y [0:9]) and one differential pair of feedback clock output (FBOUT, FBOUT). External feedback pins (FBIN, FBIN) for synchronization of the outputs to the input reference is provided. OE, OS, and AVDD control the power-down and test mode logic. When AVDD is grounded, the PLL is turned off and bypassed for test mode purposes. When the differential clock inputs (CLK, CLK) are both at logic low, this device will enter a low power-down mode. In this mode, the receivers are disabled, the PLL is turned off, and the output clock drivers are disabled, resulting in a clock driver current consumption of less than 500μA. The CSPUA877A requires no external components and has been optimised for very low phase error, skew, and jitter, while maintaining frequency and duty cycle over the operating voltage and temperature range. The CSPUA877 , designed for use in both module assemblies and system motherboard based solutions, provides an optimum high-performance clock source. The CSPUA877A is available in Commercial Temperature Range (0°C to +70°C). See Ordering Information for details. • 1 to 10 differential clock distribution • Optimized for clock distribution in DDR2 (Double Data Rate) SDRAM applications • Operating frequency: 125MHz to 410MHz • Stabilization time: <6us • Very low skew: ≤40ps • Very low jitter: ≤40ps • 1.8V AVDD and 1.8V VDDQ • CMOS control signal input • Test mode enables buffers while disabling PLL • Low current power-down mode • Tolerant of Spread Spectrum input clock • Available in 52-Ball VFBGA and 40-pin VFQFPN packages APPLICATIONS: • Meets or exceeds JEDEC standard CUA877 for registered DDR2 clock driver • Along with SSTUA32864/66, DDR2 register, provides complete solution for DDR2 DIMMs FUNCTIONAL BLOCK DIAGRAM OE OS AVDD LD or OE POWER DOWN AND LD, OS, or OE TEST MODE PLL BYPASS LOGIC LD Y0 Y0 Y1 Y1 Y2 Y2 Y3 Y3 Y4 Y4 CLK Y5 CLK Y5 10KΩ - 100KΩ Y6 PLL Y6 FBIN Y7 FBIN Y7 Y8 Y8 Y9 NOTE: The Logic Detect (LD) powers down the device when a logic LOW is applied to both CLK and CLK. Y9 FBOUT The IDT logo is a registered trademark of Integrated Device Technology, Inc. COMMERCIAL TEMPERATURE RANGE FBOUT OCTOBER 2006 1 c 2006 Integrated Device Technology, Inc. DSC 6872/4 IDTCSPUA877A 1.8V PLL DIFFERENTIAL 1:10 SDRAM CLOCK DRIVER COMMERCIAL TEMPERATURE RANGE PIN CONFIGURATION Y8 Y8 GND GND Y9 VDDQ NB GND Y9 VDDQ NB GND Y4 VDDQ GND GND Y4 Y3 Y3 J K 6 Y6 Y6 Y7 Y7 FBIN FBIN FBOUT FBOUT 5 Y5 GND GND OS VDDQ OE VDDQ 4 Y5 GND NB VDDQ NB NB 3 Y0 GND NB VDDQ NB NB 2 Y0 GND GND 1 Y1 Y1 Y2 Y2 CLK CLK A B C D E F VDDQ VDDQ VDDQ AGND AVDD H G VFBGA TOP VIEW 52 BALL VFBGA PACKAGE LAYOUT 0.65mm 6 5 TOP VIEW 4 3 2 1 A A B C D B C D E E 1 2 3 4 5 6 2 F G H F G H J J K K IDTCSPUA877A 1.8V PLL DIFFERENTIAL 1:10 SDRAM CLOCK DRIVER COMMERCIAL TEMPERATURE RANGE ABSOLUTE MAXIMUM RATINGS(1,2) Y5 Y5 Y6 Y6 VDDQ 34 33 32 31 VDDQ 36 35 Y0 Y0 37 Y1 39 38 Y1 40 PIN CONFIGURATION, CONT. 30 Y7 2 29 Y7 3 28 VDDQ CLK 4 27 FBIN CLK 5 26 FBIN FBOUT VDDQ 1 Y2 Y2 GND 20 Y8 VDDQ 18 Y8 19 17 OS Y9 21 16 10 Y9 OE GND 15 22 VDDQ 9 14 VDDQ Y4 VDDQ 13 FBOUT 23 Y4 24 8 11 7 AVDD 12 AGND Y3 6 25 Y3 VDDQ Symbol Rating VDDQ, AVDD VI(3) VO(3) Supply Voltage Range Input Voltage Range Voltage range applied to any output in the high or low state Input clamp current IIK (VI <0) IOK (VO <0 or VO > VDDQ) IO (VO =0 to VDDQ) VDDQ or GND TSTG Max Unit –0.5 to +2.5 –0.5 to VDDQ + 0.5 –0.5 to VDDQ + 0.5 V V V ±50 mA Output Clamp Current ±50 mA Continuous Output Current ±50 mA ±100 – 65 to +150 mA °C Continuous Current Storage Temperature Range NOTES: 1. Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. 2. The maximum package power dissipation is calculated using a junction temperature of 150°C and a board trace length of 750 mils. 3. The input and output negative-voltage ratings may be exceeded if the input and output clamp-current ratings are observed. This value is limited to 2.5V max. VFQFPN TOP VIEW CAPACITANCE(1) Parameter Description CIN Input Capacitance Min. Typ. Max. Unit 2 — 3 pF 0.25 pF — pF VI = VDDQ or GND CI Δ Delta Input Capacitance CLK, CLK, FBIN, FBIN CL Load Capacitance — 10 NOTE: 1. Unused inputs must be held high or low to prevent them from floating. RECOMMENDED OPERATING CONDITIONS Symbol AVDD(1) VDDQ TA Parameter Min. Supply Voltage Typ. Max. VDDQ I/O Supply Voltage Operating Free-Air Temperature Unit V 1.7 1.8 1.9 V 0 ⎯ +70 °C NOTE: 1. The PLL is turned off and bypassed for test purposes when AVDD is grounded. During this test mode, VDDQ remains within the recommended operating conditions and no timing parameters are guaranteed. 3 IDTCSPUA877A 1.8V PLL DIFFERENTIAL 1:10 SDRAM CLOCK DRIVER COMMERCIAL TEMPERATURE RANGE PIN DESCRIPTION (VFBGA) Pin Name Pin Number Description AGND G1 Ground for 1.8V analog supply AVDD H1 1.8V analog supply CLK, CLK E1, F1 Differential clock input with a 10KΩ to 100KΩ pulldown resistor FBIN, FBIN E6, F6 Feedback differential clock input FBOUT, FBOUT G6, H6 Feedback differential clock output GND B2 - B5, C2, C5, H2, H5, J2 - J5 VDDQ D2 - D4, E2, E5, F2, G2 - G5 OE F5 Ground 1.8V supply Output Enable OS D5 Y[0:9] A3, A4, B1, B6, C1, C6, K1, K2, K5, K6 Buffered output of input clock, CLK Output Select (tied to GND or VDDQ) Y[0:9] A1, A2, A5, A6, D1, D6, J1, J6, K3, K4 Buffered output of input clock, CLK NB No Ball PIN DESCRIPTION (VFQFPN) Pin Name Pin Number AGND 7 Ground for 1.8V analog supply 1.8V analog supply AVDD 8 CLK, CLK 4, 5 Description Differential clock input with a 10KΩ to 100KΩ pulldown resistor FBIN, FBIN 26, 27 Feedback differential clock input FBOUT, FBOUT 24, 25 Feedback differential clock output GND 10 VDDQ 1, 6, 9, 15, 20, 23, 28, 31, 36 OE 22 Ground 1.8V supply Output Enable OS 21 Y[0:9] 3, 11, 14, 16, 19, 29, 33, 34, 38, 39 Buffered output of input clock, CLK Output Select (tied to GND or VDDQ) Y[0:9] 2, 12, 13, 17, 18, 30, 32, 35, 37, 40 Buffered output of input clock, CLK NB No Ball 4 IDTCSPUA877A 1.8V PLL DIFFERENTIAL 1:10 SDRAM CLOCK DRIVER COMMERCIAL TEMPERATURE RANGE FUNCTION TABLE(1,2) INPUTS OUTPUTS AVDD OE OS CLK CLK Y Y FBOUT FBOUT PLL GND H X L H L H L H OFF GND H X H L H L H L OFF GND L H L H L(z) L(z) L H OFF L(z) L(z) H L OFF L H ON H L ON L H ON GND 1.8V (nom) L L L H H L L H 1.8V (nom) L L H L 1.8V (nom) H X L H 1.8V (nom) H X H 1.8V (nom) X X L L X X X H H (3) L (3) Y7 Y7 Active Active L(z) L(z) L(z) L(z) Y7 Y7 Active Active L H H L H L ON L(z) L(z) L(z) L(z) OFF Reserved NOTES: 1. H = HIGH Voltage Level L = LOW Voltage Level X = Don't Care 2. L(z) means the outputs are disabled to a LOW state, meeting the IODL limit in DC Electrical Characteristics table. 3. The device will enter a low power-down mode when CLK and CLK are both at logic LOW. 5 IDTCSPUA877A 1.8V PLL DIFFERENTIAL 1:10 SDRAM CLOCK DRIVER COMMERCIAL TEMPERATURE RANGE DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE Following Conditions Apply Unless Otherwise Specified: Commercial: TA = 0°C to +70°C Symbol Parameter Conditions Typ. Max. Unit ⎯ ⎯ – 1.2 V ⎯ ⎯ 0.35VDDQ V 0.65VDDQ ⎯ ⎯ ⎯ VDDQ + 0.3 V VDDQ + 0.4 V ⎯ V VDDQ - 0.2 ⎯ V 1.1 ⎯ Input Clamp Voltage (All Inputs) VIL(2) Input LOW Voltage (OE, OS, CLK, CLK) VIH(2) Input HIGH Voltage (OE, OS, CLK, CLK) VIN(1) Input Signal Voltage -0.3 VID(DC)(2) VOD(3) VOH VDDQ = 1.7V, II = -18mA Min. VIK DC Input Differential Voltage 0.3 Output Differential Voltage AVDD/VDDQ = 1.7V 0.6 Output HIGH Voltage IOH = -100μA, VDDQ = 1.7V to 1.9V IOH = -9mA, VDDQ = 1.7V VOL Output LOW Voltage IOL = 100μA, VDDQ = 1.7V to 1.9V IODL Output Disabled LOW Current OE = L, VODL = 100mV, AVDD/VDDQ = 1.7V Input Current CLK, CLK AVDD/VDDQ = Max., VI = 0V to VDDQ ⎯ 0.1 IOL = 9mA, VDDQ = 1.7V IIN 0.6 100 ⎯ OE, OS, FBIN, FBIN IDDLD IDD V ⎯ μA ±250 μA ±10 Static Supply Current (IDDQ and IADD) AVDD/VDDQ = Max., CLK and CLK = GND 500 μA Dynamic Power Supply Current AVDD/VDDQ = Max., CLK = 410MHz 300 mA (IDDQ and IADD)(4,5) NOTES: 1. VIN specifies the allowable DC excursion of each different output. 2. VID is the magnitude of the difference between the input level on CLK and the input level on CLK. The CLK and CLK VIH and VIL limits are used to define the DC LOW and HIGH levels for the power down mode. 3. VOD is the magnitude of the difference between the true output level and the complementary level. 4. All Outputs are left open (unconnected to PCB). 5. Total IDD = IDDQ + IADD = FCK * CPD * VDDQ, for Cpd = (IDDQ + IADD) / (FCK * VDDQ) where FCK is the input frequency, VDDQ is the power supply, and CPD is the Power Dissipation Capacitance. TIMING REQUIREMENTS Symbol Parameter Min. Max. Unit Operating Clock Frequency(1,2,5) 125 410 MHz Application Clock Frequency(1,3,5) 160 410 MHz tDC Input Clock Duty Cycle 40 60 % tL Stabilization Time(4) ⎯ 6 μs fCLK NOTES: 1. The PLL will track a spread spectrum clock input. 2. Operating clock frequency is the range over which the PLL will lock, but may not meet all timing specifications. To be used only for low speed system debug. 3. Application clock frequency is the range over which timing specifications apply. 4. Stabilization time is the time required for the integrated PLL circuit to obtain phase lock of its feedback signal to its reference signal after power up. During normal operation, the stabilization time is also the time required for the PLL circuit to obtain phase lock of its feedback signal to its reference signal when CLK and CLK go to a logic LOW state, enters the power-down mode, and later return to active operation. CLK and CLK may be left floating after they have been driven LOW for one complete clock cycle. 5. Will lock to input frequency as low as 30MHz at room temperature and nominal or higher supply voltage (1.8V - 1.9V). 6 IDTCSPUA877A 1.8V PLL DIFFERENTIAL 1:10 SDRAM CLOCK DRIVER COMMERCIAL TEMPERATURE RANGE AC ELECTRICAL CHARACTERISTICS(1) Description fCK (MHz) Min. Typ.(2) Max. Unit tEN OE to any Y/Y 160 to 410 ⎯ ⎯ 8 ns tDIS OE to any Y/Y 160 to 410 ⎯ ⎯ 8 ns sLR(I) Output Enable (OE) 160 to 410 0.5 ⎯ ⎯ V/ns Symbol Input Clock Slew Rate, measured single-ended 160 to 410 1 2.5 4 sLR(O)(4) Output Clock Slew Rate, measured single-ended 160 to 410 1.5 2.5 3 V/ns VOX(6) Output Differential-Pair Cross-Voltage 160 to 410 (VDDQ/2) -0.1 ⎯ (VDDQ/2) +0.1 V tJIT(CC+) Cycle-to-Cycle Period Jitter 160 to 410 0 ⎯ 40 ps tJIT(CC-) Cycle-to-Cycle Period Jitter 160 to 410 0 ⎯ -40 ps t(∅)(5) Static Phase Offset 160 to 410 -50 ⎯ 50 ps Dynamic Phase Offset 160 to 270 -50 ⎯ 50 ps 271 to 410 t(∅)DYN(MIN) ⎯ t(∅)DYN(MAX) 160 to 270 ⎯ ⎯ 40 271 to 410 ⎯ ⎯ tSK(O)MAX 160 to 270 -40 ⎯ 40 271 to 410 tJIT(PER)MIN ⎯ tJIT(PER)MAX 160 to 270 -75 ⎯ 75 t(∅)DYN(7) tSK(O)(7) tJIT(PER)(3,7) tJIT(HPER)(3) Output Clock Skew Period Jitter Half-Period Jitter ps ps ps 271 to 410 -50 ⎯ 50 Σt(SU)(7) | tJIT(PER) | + | t(∅)DYN | + tSK(O) 271 to 410 ⎯ ⎯ 80 ps Σt(H)(7) | t(∅)DYN | + tSK(O) 271 to 410 ⎯ ⎯ 60 ps The PLL on the CSPUA877A will meet all the above test parameters while supporting SSC synthesizers with the following parameters: SSC Modulation Frequency 30 ⎯ 33 KHz SSC Clock Input Frequency Deviation 0 ⎯ 0.5 % 2 ⎯ ⎯ MHz CSPUA877A PLL designs should target the value below to minimize SSC-induced skew: PLL Loop Bandwidth (-3dB from unity gain) NOTES: 1. There are two different terminations that are used with the above AC tests. The output load shown in figure 1 is used to measure the input and output differential pair cross-voltage only. The output load shown in figure 2 is used to measure all other tests, including input and output slew rates. For consistency, use 50Ω equal length cables with SMA connectors on the test board. 2. Refers to transition of non-inverting output. 3. Period jitter and half-period jitter specifications are seperate specifications that must be met independently of each other. 4. To eliminate the impact of input slew rates on static phase offset, the input slew rates of reference clock input (CLK, CLK) and feedback clock input (FBIN, FBIN) are recommended to be nearly equal. The 2.5V/ns slew rates are shown as a recommended target. Compliance with these nominal values is not mandatory if it can be adequately demonstrated that alternative characteristics meet the requirements of the registered DDR2 DIMM application. 5. Static phase offset does not include jitter. 6. VOX is specified at the DDR DRAM clock input or test load. 7. In the frequency range of 271 - 410MHz, the min and max values for tJIT(PER) and t(∅)DYN, and the max value for tSK(O), must not exceed the corresponding min and max values of the 160 - 270MHz range. Also, the sum of the specified values for | tJIT(PER) |, | t(∅)DYN |, and tSK(O) must meet the requirement for Σt(SU), and the sum of the specified values for | t(∅)DYN | and tSK(O) must meet the requirement for Σt(H). 7 IDTCSPUA877A 1.8V PLL DIFFERENTIAL 1:10 SDRAM CLOCK DRIVER COMMERCIAL TEMPERATURE RANGE TEST CIRCUIT AND SWITCHING WAVEFORMS VDDQ Z = 60Ω C = 10pF L = 2.97" R = 120Ω Z = 60Ω GND VTT R = 1MΩ C = 1pF VTT R = 1MΩ C = 1pF C = 10pF L = 2.97" GND CSPUA877A SCOPE GND NOTE: VTT = GND Figure 1: Output Load Test Circuit 1 VDDQ/2 R = 10Ω Z = 60Ω L = 2.97" Z = 50Ω C = 10pF R = 50Ω VDDQ/2 0V R = 10Ω Z = 60Ω L = 2.97" Z = 50Ω C = 10pF R = 50Ω 0V V DDQ/2 CSPUA877A SCOPE VDDQ/2 Figure 2: Output Load Test Circuit 2 8 IDTCSPUA877A 1.8V PLL DIFFERENTIAL 1:10 SDRAM CLOCK DRIVER COMMERCIAL TEMPERATURE RANGE TEST CIRCUIT AND SWITCHING WAVEFORMS Yx, FBOUT Yx, FBOUT tcycle n tcycle n+1 tjit(cc) = tcycle n tcycle n+1 Cycle-to-Cycle jitter CLK CLK FBIN FBIN t(Ø)n + 1 t(Ø)n ∑ t(Ø) = n=N 1 t(Ø)n N Static Phase Offset Yx Yx Yx, FBOUT Yx, FBOUT tsk(o) Output Skew 9 (N is a large number of samples) IDTCSPUA877A 1.8V PLL DIFFERENTIAL 1:10 SDRAM CLOCK DRIVER COMMERCIAL TEMPERATURE RANGE TEST CIRCUIT AND SWITCHING WAVEFORMS Yx, FBOUT Yx, FBOUT tcycle n Yx, FBOUT Yx, FBOUT 1 fo tjit(per) = tcycle n 1 fo NOTE: fo = Average input frequency measured at CLK / CLK Period jitter Yx, FBOUT Yx, FBOUT thalf period n+1 thalf period n Yx, FBOUT Yx, FBOUT 1 fo tjit(hper) = thalf period n NOTE: fo = Average input frequency measured at CLK / CLK Half-Period jitter 10 1 2*fo IDTCSPUA877A 1.8V PLL DIFFERENTIAL 1:10 SDRAM CLOCK DRIVER COMMERCIAL TEMPERATURE RANGE TEST CIRCUIT AND SWITCHING WAVEFORMS 50% VDDQ OE tEN Y 50% VDDQ Y/Y Y OE 50% V DDQ tDIS Y 50% V DDQ Y Time Delay Between Output Enable (OE) and Clock Output (Y, Y) CLK CLK FBIN FBIN t(Ø) t(Ø)DYN t(Ø) SSC OFF SSC OFF SSC ON SSC ON t(Ø)DYN t(Ø)DYN Dynamic Phase Offset 11 t(Ø)DYN IDTCSPUA877A 1.8V PLL DIFFERENTIAL 1:10 SDRAM CLOCK DRIVER COMMERCIAL TEMPERATURE RANGE TEST CIRCUIT AND SWITCHING WAVEFORMS 80% Clock Inputs and Outputs, OE 80% VID, VOD 20% 20% tSLR(I/O) = tF(I), tF(O) tR(I), tR(O) V80% V20% tSLF(I/O) = tR(I/O) V80% V20% tF(I/O) Input and Output Slew Rates VIA CARD 1Ω BEAD 0603 AVDD VDDQ VDDQ 4.7uF 1206 0.1uF 0603 2200pF 0603 1 10 CSPUA877A GND AGND VIA CARD GND NOTES: Place all decoupling capacitors as close to the CSPUA877A pins as possible. Use wide traces for AVDD and AGND. Recommended bead: Fair-rite P/N 2506036017Y0 or equivalent (0.8Ω DC max., 600Ω at 100MHz). Recommended Filtering for the Analog and Digital Power Supplies (AVDD and VDDQ) APPLICATION INFORMATION Clock Loading on the PLL outputs (pF) Clock Structure # of SDRAM Loads per Clock Min. Max. #1 2 3 5 #2 4 6 10 12 0.1uF 0603 IDTCSPUA877A 1.8V PLL DIFFERENTIAL 1:10 SDRAM CLOCK DRIVER COMMERCIAL TEMPERATURE RANGE APPLICATION INFORMATION ~2.5" ~0.6" (split to terminator) SDRAM CSPUA877A Z = 60Ω CLK R = 120Ω R = 120Ω Z = 60Ω CLK FBIN C = 10pF 8 more SDRAM ~0.3" R = 120Ω FBIN Feedback path Clock Structure 1 ~2.5" ~0.6" (split to terminator) SDRAM Stacked SDRAM CSPUA877A Z = 60Ω CLK R = 120Ω R = 120Ω Z = 60Ω CLK FBIN C = 10pF SDRAM 8 more ~0.3" R = 120Ω FBIN Feedback path Clock Structure 2 13 SDRAM Stacked IDTCSPUA877A 1.8V PLL DIFFERENTIAL 1:10 SDRAM CLOCK DRIVER COMMERCIAL TEMPERATURE RANGE ORDERING INFORMATION X XX IDTCSPUA XXXXX Device Type Package Process CORPORATE HEADQUARTERS 6024 Silver Creek Valley Road San Jose, CA 95138 Blank 0°C to +70°C (Commercial) BVG NLG Very Fine Pitch Ball Grid Array - Green Thermally Enhanced Plastic Very Fine Pitch Quad Flat Pack No Lead Package - Green 877A 1.8V PLL Differential 1:10 SDRAM Clock Driver for SALES: 800-345-7015 or 408-284-8200 fax: 408-284-2775 www.idt.com 14 for Tech Support: [email protected]