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FEATURES

DESCRIPTION

CDCU877B

1.8-V PHASE LOCK LOOP CLOCK DRIVER

SCAS801B – JUNE 2005 – REVISED JULY 2007

• Low Dynamic Phase Offset: ±15 ps

• 1.8-V Phase Lock Loop Clock Driver for

• Low Static Phase Offset: ±50 ps

Double Data Rate (DDR II) Applications

• Distributes One Differential Clock Input to Ten

• Spread Spectrum Clock Compatible

Differential Outputs

• Operating Frequency: 10 MHz to 340 MHz

• 52-Ball μBGA (MicroStar™ Junior BGA,

0,65-mm pitch)

• Low Current Consumption: <115 mA

• External Feedback Pins (FBIN, FBIN) are Used

• Low Jitter (Cycle-Cycle): ±30 ps

to Synchronize the Outputs to the Input

• Low Output Skew: 25 ps

Clocks

• Low Period Jitter: ±20 ps

• Fail-Safe Inputs

The CDCU877B 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 CDCU877B is able to track spread spectrum clocking (SSC) for reduced EMI. This device operates from

—40

°C to 85°C.

ORDERING INFORMATION

-40

°C to 70°C

CDCU877BZQL

(1)

For the most current package and ordering information, see the

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

TI website at www.ti.com.

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 is a trademark of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

Copyright © 2005–2007, 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.