Datasheet > CY2285PVC-2T

CY2285PVC-2T

更新时间： 2024-11-26 09:53:39

品牌	Logo	应用领域
赛普拉斯 - CYPRESS		光电二极管
页数	文件大小	规格书
9页	120K
描述
Processor Specific Clock Generator, 100MHz, CMOS, PDSO28, 0.210 INCH, SSOP-28

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CY2285PVC-2T 数据手册

CY2285

100-MHz Pentium^®II Clock Synthesizer/Driver

with Spread Spectrum for Mobile PCs

The CY2285 possesses power-down, CPU stop, and PCI stop

pins for power management control. The signals are synchro-

nized on-chip, and ensure glitch-free transitions on the out-

Features

Mixed 2.5V and 3.3V operation

•

puts. When the CPU_STOP input is asserted, the CPU clock

outputs are driven LOW. When the PCI_STOP input is assert-

ed, the PCI clock outputs (except the free-running PCI clock)

are driven LOW. When the PWR_DWN pin is asserted, the

reference oscillator and PLLs are shut down, and all outputs

are driven LOW.

Complete clock solution for Pentium® II, and other sim-

ilar processor-based motherboards

— Two CPU clocks at 2.5V up to 100 MHz

— Six synchronous PCI clocks, one free-running

— Two 3.3V Reference clocks at 14.318 MHz

— One 3.3V USB clock running at 48 MHz

— One 3.3V USB/IO clock running at 48 MHz/24 MHz

The CY2285-2 features an early PCI clock which leads the

other PCI clocks by 1–4 ns. The CY2285-2 also features a

DIV4 pin which allows for dynamic shifting of CPU and PCI

clocks from the default frequency to the default/4.

• Spread Spectrum clocking for EMI control

• 1.5–4.0 ns delay between CPU and PCI clocks

Power-down, CPU stop and PCI stop pins

CY2285 Selector Guide

•

Clock Outputs

CY2285-1

CY2285-2

CY2285-3

Low skew outputs, 175 ps between CPU clocks

≤

• Early PCI clock leads PCI by 1–4 ns (-2 option)

• DIV4 allows dynamic shifting of CPU and PCI clocks

from the default frequency to default/4 (-2 option)

CPU (66,

100 MHz)

[1]

[1, 2]

[1]

PCI (CPU/2,

CPU/3 MHz)

Factory-EPROM programmable output drive and slew

rate for EMI customization

•

Ref. (14.318 MHz)

USB (48 MHz)

• Available in space-saving 28-pin SSOP package

Functional Description

USB/IO (48

MHz/24 MHz se-

lectable)

N/A

The CY2285 is a clock synthesizer/driver for Pentium II, or

other similar processor-based mobile PCs requiring up to

100-MHz support. The CY2285 outputs two CPU clocks at

2.5V. There are six PCI clocks, running at one-half or one-third

the CPU clock frequency of 66.6 MHz and 100 MHz respec-

tively. One of the PCI clocks is free-running. Additionally, the

part outputs two 3.3V reference clocks at 14.318 MHz.

CPU-PCI delay

EPCI-PCI delay

Spread Spectrum

1.5–4.0 ns

N/A

1.5–4.0 ns

1.0–4.0 ns

–0.6%

1.5–4.0 ns

N/A

–0.6%

Downspread Downspread Downspread

The CY2285 provides incorporates the Intel®-defined spread

spectrum features. It provides a –0.6% downspread on the

CPU and PCI clocks, which can help reduce EMI in certain

high-speed systems.

Notes:

1. One free-running PCI clock.

2. One early PCI clock.

SPREAD (-2,-3 option)

Logic Block Diagram

REF0/SPREAD

REF0 (-2 option)

DIV4

REF1/SEL48

REF1 (-2,-3 option)

XTALIN

14.318

MHz

OSC.

V_DDREF

XTALOUT

STOP

LOGIC

CPU

PLL

CPUCLK [0–1]

V_DDCPU

Divider

Delay

PWR_DWN

EPCICLK (-2 option)

V_DDPCI

EPROM

STOP

LOGIC

PCICLK [1-5]

V_DDPCI

CPU_STOP

PCI_STOP

PCICLK_F

V_DDPCI

SYS

PLL

USBCLK

V_DD48

USB_IOCLK/TS (-1 option)

USBCLK/SEL100/66 (-2 option)

V_DD48

Intel and Pentium are registered trademarks of Intel Corporation.

Cypress Semiconductor Corporation

•

3901 North First Street

•

San Jose

•

CA 95134

•

408-943-2600

May 18, 2000

12 3 4 5 6 7...9

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与CY2285PVC-2T相关器件

型号	品牌	获取价格	描述	数据表
CY2285PVC-3	CYPRESS	获取价格	100-MHz Pentium㈢II Clock Synthesizer/Driver w
CY2286PVC-1	CYPRESS	获取价格	Processor Specific Clock Generator, 100MHz, MOS, PDSO56, SSOP-56
CY2286PVC-2	CYPRESS	获取价格	Processor Specific Clock Generator, 100MHz, MOS, PDSO56, SSOP-56
CY2287	CYPRESS	获取价格	100-MHz Spread Spectrum Clock Synthesizer/Driver with USB, Hublink, and SDRAM Support
CY2287-1	CYPRESS	获取价格	100-MHz Spread Spectrum Clock Synthesizer/Driver with USB, Hublink, and SDRAM Support
CY2287PVC-1	CYPRESS	获取价格	100-MHz Spread Spectrum Clock Synthesizer/Driver with USB, Hublink, and SDRAM Support
CY2291	CYPRESS	获取价格	Three-PLL General Purpose EPROM Programmable Clock Generator
CY2291_02	CYPRESS	获取价格	Three-PLL General Purpose EPROM Programmable Clock Generator
CY2291_08	CYPRESS	获取价格	Three-PLL General Purpose EPROM Programmable Clock Generator
CY2291F	CYPRESS	获取价格	Three-PLL General Purpose EPROM Programmable Clock Generator

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