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IDTCSPT857/A

2.5V PLL DIFFERENTIAL 1:10 SDRAM CLOCK DRIVER

COMMERCIALANDINDUSTRIALTEMPERATURERANGES

2002

Integrated Device Technology, Inc.

DSC-5172/8

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IDTCSPT857/A

COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES

2.5V PHASE LOCKED LOOP

DIFFERENTIAL 1:10 SDRAM

CLOCK DRIVER

Y0

Y0

FBOUT

Y1

Y1

Y5

Y5

Y4

Y4

Y3

Y3

Y2

Y2

Y8

Y8

Y6

Y6

Y7

Y7

Y9

Y9

FBOUT

3/A1

2/A2

5/B2

6/B1

10/D1

9/D2

20/J2

19/J1

22/K1

23/K2

46/A6

47/A5

44/B5

43/B6

39/D6

40/D5

29/J5

30/J6

27/K6

26/K5

32/H6

33/H5

PLL

CLK

PWRDWN

37/E6

CLK

13/F1

14/F2

36/F6

35/F5

16/G2

FBIN

FBIN

TEST

MODE

LOGIC

OCTOBER 2002

The IDT logo is a registered trademark of Integrated Device Technology, Inc.

FEATURES:

• Optimized for clock distribution in DDR (Double Data Rate)

SDRAM applications

• Operating frequency: 60MHz to 200MHz

• Standard speed: PC1600 (DDR200), PC2100 (DDR266)

• A speed: PC1600 (DDR200), PC2100 (DDR266), PC2700 (DDR333)

• 1 to 10 differential clock distribution

• Very low skew (<100ps)

• Very low jitter (<75ps)

• CMOS control signal input

• Test mode enables buffers while disabling PLL

• Low current power-down mode

• Tolerant of Spread Spectrum input clock

• Available in 48-pin TSSOP and 56-pin VFBGA packages

DESCRIPTION:

The CSPT857 is a PLL based clock driver that acts as a zero delay buffer

todistributeonedifferentialclockinputpair(CLK,CLK)to10differentialoutput

FBOUT). External feedback pins (FBIN, FBIN) for synchronization of the

outputs to the input reference is provided. A CMOS Enable/Disable pin is

available for low power disable. When the output frequency falls below

approximately20MHz,thedevicewillenterpowerdownmode. Inthismode,

the receivers are disabled, the PLL is turned off, and the output clock drivers

aretristated,resultinginacurrentconsumptiondeviceoflessthan200

µA.

The CSPT857 requires no external components and has been optimised

forverylowI/Ophaseerror,skew,andjitter,whilemaintainingfrequencyand

duty cycleovertheoperatingvoltageandtemperaturerange.TheCSPT857,

designedforuseinbothmoduleassembliesandsystemmotherboardbased

solutions,providesanoptimumhigh-performanceclocksource.

TheCSPT857isonlyavailableinIndustrialTemperatureRange(-40°Cto

+85°C),andCSPT857AisonlyavailableinCommercialTemperatureRange

(0°C to +70°C). See Ordering Information for details.

FUNCTIONAL BLOCK DIAGRAM