C9851BY

更新时间： 2024-01-04 00:03:30

品牌	Logo	应用领域
赛普拉斯 - CYPRESS		时钟发生器服务器
页数	文件大小	规格书
14页	125K
描述
Clock Generator for Pentium III Server and Workstation Applications

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C9851BY 数据手册

PRELIMINARY

C9851

Clock Generator for Pentium III Server and Workstation Applications

Product Features

Product Description

This device provides the necessary clocks for a

differential host bus system in multi-processor servers

and workstations. It also generates a 66.6MHz hub

clock for interfacing with a complimentary part, the

Cypress B9852. The 2 Mref clock outputs are 180

degrees out of phase and are used for interfacing with

the Direct Rambus Clock Generator (DRCG), C9820,

C9821, or C9822. This device integrates the Cypress

spread spectrum technology for optimum EMI

reduction.

•

Six pairs of current referenced differential clocks

Two 3V 180° displaced Mref clocks for DRCG

One 66.6 MHz reference output

One 14.318 MHz reference output

Select logic for Differential Swing Control, Test

mode, Hi-Z, Power-down, Spread spectrum, and

limited frequency select

Cypress Spread Spectrum for EMI reduction

48 Pin SSOP Package

•

Frequency Selection Table

SEL 100/133 SELA SELB

CPU(1:6), CPU#(1:6)

3VMref,

3V66

REF

3Vmref_b

100 MHz

200 MHz

Hi-Z

133.3 MHz

25 MHz

200 MHz

REF/2

50 MHz

Low

50 MHz

Hi-Z

66.67 MHz

50 MHz

66.7 MHz

REF/4

66.67 MHz

Low

66.67 MHz

Hi-Z

66.67 MHz

REF

14.318 MHz

Low

14.318 MHz

Hi-Z

14.318 MHz

REF

Table 1

Block Diagram

Pin Configuration

VSSR

Ref

VDDR

XIN

XOUT

VSSR

VDD

VSS

VDDR

REF

XIN

OSC

VDDC

CPU1

CPU1#

VSSC

CPU2

CPU2#

VDDC

CPU3

CPU3#

VSSC

CPU4

CPU4#

VDDC

CPU5

CPU5#

VSSC

CPU6

CPU6#

VDDC

I_Ref

VSSR

XOUT

VDDA

VDDM

3VMref

3VMref_b

VSSM

VDD

I_Ref

VSSI

MultSel(0:1)

Control

CPU (1:6)

CPU (1:6)#

VDDM

Spread#

SelA

VCO

VSS

VDDL

3V66

VSSL

SelB

SEL100/133

3VMRef

3VMRef_b

VSSM

SEL100/133

MultSel0

MultSel1

VDDA

VSSA

SelA

SelB

Spread#

PwrDwn#

VDDL

3V66

VSSL

VSSA

VDDA

Cypress Semiconductor Corporation

525 Los Coches St.

Document#: 38-07068 Rev. **

05/04/2001

Milpitas, CA 95035. Tel: 408-263-6300, Fax: 408-263-6571

http://www.cypress.com

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