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IDTCSPT857C

2.5V - 2.6V PLL DIFFERENTIAL 1:10 SDRAM CLOCK DRIVER

COMMERCIALANDINDUSTRIALTEMPERATURERANGES

2003

Integrated Device Technology, Inc.

DSC-6201/13

c

IDTCSPT857C

COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES

2.5V - 2.6V PHASE LOCKED

LOOP DIFFERENTIAL 1:10

SDRAM CLOCK DRIVER

JUNE 2003

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

FEATURES:

• 1 to 10 differential clock distribution

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

SDRAM applications

• Operating frequency: 60MHz to 220MHz

• Very low skew:

– <100ps for PC1600 - PC2700

– <75ps for PC3200

• Very low jitter:

– <75ps for PC1600 - PC2700

– <50ps for PC3200

• 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 TVSOP, 40-pin VFQFPN, and 56-

pin VFBGA packages

DESCRIPTION:

TheCSPT857CisaPLLbasedclockdriverthatactsasazerodelaybuffer

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 input frequency falls below

approximately20MHz,thedevicewillenterpowerdownmode. Inthismode,

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

aretristated,resultinginacurrentconsumptionoflessthan200

µA.

TheCSPT857Crequiresnoexternalcomponentsandhasbeenoptimised

forverylowI/Ophaseerror,skew,andjitter,whilemaintainingfrequencyand

duty cycleovertheoperatingvoltageandtemperaturerange.TheCSPT857C,

designedforuseinbothmoduleassembliesandsystemmotherboardbased

solutions,providesanoptimumhigh-performanceclocksource.

The CSPT857C is available in Commercial Temperature Range (0°C to

+70°C) and Industrial Temperature Range (-40°C to +85°C). See Ordering

Informationfordetails.

APPLICATIONS:

• Meets or exceeds JEDEC standard JESD 82-1A for registered

DDR clock driver

• Meets proposed DDR1-400 specification

• For all DDR1 speeds: PC1600 (DDR200), PC2100 (DDR266),

PC2700 (DDR333), PC3200 (DDR400)

• Along with SSTV16857, SSTVF16857, SSTV16859, SSTVM16859,

SSTVF16859, DDR1 register, provides complete solution for

DDR1 DIMMs