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CDCD5704PWRG4 Datenblatt(PDF) 1 Page - Texas Instruments

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Teilenummer CDCD5704PWRG4
Bauteilbeschribung  Rambus TM XDR TM CLOCK GENERATOR
Download  17 Pages
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Hersteller  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

CDCD5704PWRG4 Datenblatt(HTML) 1 Page - Texas Instruments

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FEATURES
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28
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19
15
VDDP
VSSP
ISET
VSS
REFCLK
REFCLKB
VDDC
EN
VSSC
ID0
SCL
ID1
SDA
BYPASS
VDD
CLK0
CLK0B
VSS
CLK1
CLK1B
VDD
VSS
VSS
CLK3
CLK2
CLK3B
CLK2B
VDD
PWPACKAGE
(TOP VIEW)
P0043-01
APPLICATIONS
DESCRIPTION
CDCD5704
SCAS823 – DECEMBER 2006
Rambus™ XDR™ CLOCK GENERATOR
• High-Speed Clock Support: 300-MHz–667-MHz
Clock Source for XDR Memory Subsystems
and Redwood Logic Interface
• Quad (Open-Drain) Differential Output Drivers
• Spread-Spectrum Compatible Clock Input Can
Be Distributed to Minimize EMI
• Differential or Single-Ended Reference Clock
Input of 100 MHz or 133 MHz
• Serial Interface Features: Programmable
Frequency Multiplier, Select Any One to Four
Outputs and Mode of Operation
• Supports Frequency Multiplication Factors of:
×3, ×4, ×5, ×6, ×8, ×9/2, ×15/2, ×15/4
• All PLL Loop Filter Components Are
Integrated
• Low |Cycle-to-Cycle| of 1–6 Cycle Jitter:
40 ps: 300–635 MHz
30 ps: 636–667 MHz
• PLLs Are Powered Down if No Valid REF
Clock (<10 MHz) Is Detected or VDD Is Below
1.6 V
• Operates From Single 2.5-V Supply (±0.125 V)
• Packaged in TSSOP-28
• Commercial Temperature Range 0°C to 70°C
• XDR Memory Subsystem and Redwood Logic
Interface
The CDCD5704 clock generator provides the necessary clock signals to support an XDR memory subsystem
and Redwood logic interface using a reference clock input with or without spread-spectrum modulation.
Contained in a 28-pin TSSOP package that includes four differential clock outputs, the CDCD5704 provides an
off-the-shelf solution for a broad range of high-performance interface applications.
The block diagram shows the major components of the CDCD5704, which include a phase-locked loop, a
bypass multiplexer, and four differential output buffers (CLK0 to CLK3). All four outputs can be disabled by a
logical low at the input of the EN pin. An output is enabled when EN is high and a value of 1 is in its serial
interface register (RegA–RegD).
The PLL receives a reference clock input signal, REFCLK, and outputs a clock signal at a frequency equal to the
input frequency times the multiplication factor. The PLL output clock signal is fed to the differential output buffers
to drive the enabled clocks. Disabled outputs are set to high impedance.
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.
Rambus, XDR are trademarks of Rambus Inc.
All other trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2006, 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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