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DESCRIPTION

CDCUA877

SCAS769A – AUGUST 2006 – REVISED JUNE 2007

1.8-V PHASE LOCK LOOP CLOCK DRIVER

• Distributes One Differential Clock Input to Ten

Differential Outputs

• 1.8-V/1.9-V Phase Lock Loop Clock Driver for

Double Data Rate (DDR II) Applications

• 52-Ball μBGA (MicroStar Junior™ BGA,

0,65-mm pitch)

• Spread Spectrum Clock Compatible

• External Feedback Pins (FBIN, FBIN) are Used

• Operating Frequency: 125 MHz to 410 MHz

to Synchronize the Outputs to the Input

• Application Frequency: 160 MHz to 410 MHz

Clockst

• Low Current Consumption: <200 mA Typ

• Meets or Exceeds CUA877/CAU878

• Low Jitter (Cycle-Cycle): ±40 ps

Specification PLL Standard for

• Low Output Skew: 35 ps

PC2-3200/4300/5300/6400o

• Stabilization Time <6 μs

• Fail-Safe Inputs

The CDCUA877 is a high-performance, low-jitter, low-skew, zero-delay buffer that distributes a differential clock

input pair (CK, CK) to ten differential pairs of clock outputs (Yn, Yn) and to one differential pair of feedback clock

outputs (FBOUT, FBOUT). The clock outputs are controlled by the input clocks (CK, CK), the feedback clocks

clock outputs, except FBOUT/FBOUT, are disabled while the internal PLL continues to maintain its locked-in

as previously described. When OS and OE are both low, OE has no affect on Y7/Y7, they are free running.

When both clock inputs (CK, CK) are logic low, the device enters in a low power mode. An input logic detection

circuit on the differential inputs, independent from input buffers, detects the logic low level and performs in a low

power state where all outputs, the feedback, and the PLL are off. When the clock inputs transition from being

logic low to being differential signals, the PLL turns back on, the inputs and the outputs are enabled, and the

PLL obtains phase lock between the feedback clock pair (FBIN, FBIN) and the clock input pair (CK, CK) within

the specified stabilization time.

The CDCUA877 is able to track spread spectrum clocking (SSC) for reduced EMI. This device operates from

–40

°C to 85°C).

AVAILABLE OPTIONS

–40

°C to 85°C

CDCUA877ZQL

(1)

For the most current package and ordering information, see the

Package Option Addendum at the end of this document, or see the

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

MicroStar Junior is a trademark of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

Copyright © 2006–2007, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.