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Texas Instruments CDCU877RHAT — Clock & Timing ICs
Texas Instruments

TI CDCU877RHAT PLL Clock Driver, 400 MHz, DDR2, 40-VQFN

MPNCDCU877RHAT
End of Life

Texas Instruments CDCU877RHAT, PLL clock driver, DDR2 memory, 400 MHz max, 1:10 input:output, SSTL-18 I/O, 1.7V–1.9V supply, -40°C to 85°C, 40-VQFN (6x6) surface mount.

$9.59Ref. price · indicative, final on quote
CDCU877RHAT datasheet
Packaging40-VFQFN Exposed Pad
StockContact for availability
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Specifications

CDCU877RHAT Technical Specifications
ParameterValue
Mounting typeSurface Mount
Voltage1.7V ~ 1.9V
Frequency400MHz
Operating temperature-40°C ~ 85°C
PLLYes
InputSSTL-18
OutputSSTL-18
PackageTape & Reel (TR); Cut Tape (CT)
Main purposeMemory, DDR2
Case40-VFQFN Exposed Pad
Number of circuits1
Ratio - Input:Output1:10
Differential - Input:OutputYes/Yes

Product details

PLL clock driver for DDR2 — what it does and where it fits

The Texas Instruments CDCU877RHAT is a 1.8V PLL clock driver designed specifically for DDR2 memory systems. It takes one differential SSTL-18 reference clock and fans it out to ten differential outputs, all running at up to 400 MHz. The part lives in a 40-pin VQFN package (6x6 mm) and operates across the industrial temperature range of -40°C to 85°C, so it handles telecom racks, industrial controllers, and outdoor base stations — not just server DIMMs.

1:10 fanout and 400 MHz — what the ratings mean for the bus

The 1:10 ratio means one clean reference clock from the chipset or oscillator can feed ten DDR2 loads — typically multiple DIMM slots or a mix of memory and controller. At 400 MHz the PLL keeps output-to-output skew tight enough to hold the DDR2 setup-and-hold window across the whole bank. Both input and output are differential SSTL-18, so the part mates directly to DDR2 DRAM and chipset clock pins without level translation.

Industrial temperature and active lifecycle

The -40°C to 85°C rating covers the industrial temperature range. The part is Active and RoHS3 compliant.

Frequently asked questions

What is the function of CDCU877RHAT?

It is a PLL clock driver for DDR2 memory. It takes one differential SSTL-18 input clock and distributes it to ten differential outputs at up to 400 MHz, providing the low-jitter reference clocks needed by DDR2 DRAM and memory controllers.

Is CDCU877RHAT compatible with DDR2 memory?

Yes, the part is specified for DDR2 memory clock distribution. Its SSTL-18 I/O levels and 400 MHz maximum frequency match the DDR2-800/1066 bus timing requirements.