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CDCFR83ADBQG4 数据表(PDF) 1 Page - Texas Instruments

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部件名 CDCFR83ADBQG4
功能描述  DIRECT RAMBUS CLOCK GENERATOR
Download  15 Pages
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

CDCFR83ADBQG4 数据表(HTML) 1 Page - Texas Instruments

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FEATURES
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VDDIR
REFCLK
VDDP
GNDP
GNDI
PCLKM
SYNCLKN
GNDC
VDDC
VDDIPD
STOPB
PWRDNB
S0
S1
VDDO
GNDO
CLK
NC
CLKB
GNDO
VDDO
MULT0
MULT1
S2
DBQ PACKAGE
(TOP VIEW)
NC − No internal connection
DESCRIPTION
CDCFR83A
SCAS812 – AUGUST 2005
DIRECT RAMBUS™ CLOCK GENERATOR
533-MHz Differential Clock Source for Direct
Rambus™ Memory Systems for an 1066-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 40 ps at
533 MHz
Certified by Gigatest Labs to Exceed the
Rambus DRCG Validation Requirement
Supports Industrial Temperature Range of
–40
°C to 85°C
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.
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, Rambus are trademarks of Rambus Inc.
PRODUCTION DATA information is current as of publication date.
Copyright © 2005, 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.


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