CDCR83A TelCom Semiconductor, CDCR83A Datasheet

CDCR83A

Manufacturer Part Number

CDCR83A

Description

DIRECT RAMBUS CLOCK GENERATOR

Manufacturer

TelCom Semiconductor

Datasheet

1.CDCR83A.pdf (12 pages)

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FEATURES

DESCRIPTION

The Direct Rambus clock generator (DRCG) provides the necessary clock signals to support a Direct Rambus

memory subsystem. It includes signals to synchronize the Direct Rambus channel clock to an external system or

processor clock. It is designed to support Direct Rambus memory on a desktop, workstation, server, and mobile

PC motherboards. DRCG also provides an off-the-shelf solution for a broad range of Direct Rambus memory

applications.

The DRCG provides clock multiplication and phase alignment for a Direct Rambus memory subsystem to enable

synchronous communication between the Rambus channel and ASIC clock domains. In a Direct Rambus

memory subsystem, a system clock source provides the REFCLK and PCLK clock references to the DRCG and

memory controller, respectively. The DRCG multiplies REFCLK and drives a high-speed BUSCLK to RDRAMs

and the memory controller. Gear ratio logic in the memory controller divides the PCLK and BUSCLK frequencies

by ratios M and N such that PCLKM = SYNCLKN, where SYNCLK = BUSCLK/4. The DRCG detects the phase

difference between PCLKM and SYNCLKN and adjusts the phase of BUSCLK such that the skew between

PCLKM and SYNCLKN is minimized. This allows data to be transferred across the SYNCLK/PCLK boundary

without incurring additional latency.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

DIRECT RAMBUS, Rambus are trademarks of Rambus Inc.

400-MHz Differential Clock Source for Direct

Rambus™ Memory Systems for an 800-MHz

Data Transfer Rate

Fail-Safe Power Up Initialization

Synchronizes the Clock Domains of the

Rambus Channel With an External System or

Processor Clock

Three Power Operating Modes to Minimize

Power for Mobile and Other Power-Sensitive

Applications

Operates From a Single 3.3-V Supply and

120 mW at 300 MHz (Typ)

Packaged in a Shrink Small-Outline Package

(DBQ)

Supports Frequency Multipliers: 4, 6, 8, 16/3

No External Components Required for PLL

Supports Independent Channel Clocking

Spread Spectrum Clocking Tracking

Capability to Reduce EMI

Designed for Use With TI's 133-MHz Clock

Synthesizers CDC924 and CDC921

Cycle-Cycle Jitter Is Less Than 50 ps at

400 MHz

Certified by Gigatest Labs to Exceed the

Rambus DRCG Validation Requirement

Supports Industrial Temperature Range of

–40 C to 85 C

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.

DIRECT RAMBUS™ CLOCK GENERATOR

SYNCLKN

NC − No internal connection

PWRDNB

REFCLK

PCLKM

STOPB

GNDC

GNDP

GNDI

IPD

DBQ PACKAGE

(TOP VIEW)

SCAS811 – AUGUST 2005

GNDO

CLK

CLKB

GNDO

MULT0

MULT1

CDCR83A

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