Datasheet > W281H

W281H

更新时间： 2024-11-11 03:28:15

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
10页	111K
描述
Processor Specific Clock Generator, 66MHz, CMOS, PDSO48, 0.300 INCH, SSOP-48

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中文翻译

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W281H 数据手册

W281

PRELIMINARY

Spread Spectrum Frequency Timing Generator

for Integrated CPU

Features

Benefits

• Mixed 2.5V and 3.3V operation

— IntegratedCY2219(mainClock)andCY2310(SDRAM

buffer) into a single chip

Supports Intel Timna processors with integrated graphics and

memory controllers

— Combined with W134S, W281 offers an optimized and

cost reduced solution for Timna platform

• Multiple output clocks at different frequencies

— Two CPU clocks at 66 MHz

Single-chip main motherboard clock generator

— Support for CPU and chipset

— Six PCI clocks at 33 MHz, 1 free-running

— One DRCG reference clock at 66 MHz or 50 MHz

— One synchronous APIC clock at 16.67 MHz

— One 3.3V and one 2.5V clock at 48 MHz

— Two reference clocks at 14.318 MHz

— Nine SDRAM output clocks

— Support for multiple PCI slots and chipset

— Drives one main memory clock generator, including

DRCG (W134S)

— Supports USB frequencies and I/O chip

• Non-linear Spread Spectrum implementation

• Two Frequency Select inputs

• Low-skew and low-jitter outputs

• OE and Test Mode support

Maximize EMI reduction

Supports up to four CPU clock frequencies

Meets tight system timing requirements at high frequency

Enables ATE and “bed of nails” testing

• 48-pin SSOP package

Widely available, standard package enables lower cost

Pin Configuration^[1]

Logic Block Diagram

SSOP

Top View

VDD_2V48M

APIC0

2V48M

3V48M

VDD_APIC

VDD_CPU

VDD_3V48M

GND_48M

REF [0–1]

CPU0

XIN

MREF66_50

CPU0

CPU1_ICH

XOUT

GND_CPU

GND_REF

REF0

MREF66_50

VDD_MREF

GND_MREF

SDRAM_MTH

REF1

VDD_REF

CPU1_ICH

XIN

14.318

MHz

OSC.

Divider, Stop,

&Other

CPU

PLL

PCI0

PCI1

XOUT

Logic

PCI [0–5] (33.33 MHz)

APIC0 (16.67 MHz)

SDRAM0

VDD_SDRAM

GND_SDRAM

SDRAM1

GND_PCI

VDD_PCI

PCI2

SDATA

SDRAM2

PCI3

SDRAM_MTH

SDRAM [0-7]

SCLK

SDRAM3

PCI4

PCI5

VDD_SDRAM

GND_SDRAM

SDRAM_IN

SCLK

SYS

PLL

VDD_CORE

GND_CORE

SDATA

SDRAM4

SDRAM5

3V48M (48 MHz)

2V48M(48 MHz)

VDD_SDRAM

GND_SDRAM

SDRAM6

SDRAM_IN

SDRAM7

Note:

1. Pins denoted by * have internal pull-up resis-

tor. Designer should not solely rely on internal

resistor to set I/O pins HIGH,

Intel and Pentium are registered trademarks of Intel Corporation.

Cypress Semiconductor Corporation

•

3901 North First Street

•

San Jose

•

CA 95134

•

408-943-2600

July 31, 2000, rev. **

12 3 4 5 6 7...10

中文翻译

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与W281H相关器件

型号	品牌	获取价格	描述	数据表
W281HT	CYPRESS	获取价格	Processor Specific Clock Generator, 66MHz, CMOS, PDSO48, 0.300 INCH, SSOP-48
W2820VC420	LITTELFUSE	获取价格	我们种类繁多的整流器二极管可提供一流的性能和可靠性。可提供阻断电压在200V至7.2kV
W2820VC450	LITTELFUSE	获取价格	我们种类繁多的整流器二极管可提供一流的性能和可靠性。可提供阻断电压在200V至7.2kV
W2820VF420	LITTELFUSE	获取价格	我们种类繁多的整流器二极管可提供一流的性能和可靠性。可提供阻断电压在200V至7.2kV
W2820VF450	LITTELFUSE	获取价格	我们种类繁多的整流器二极管可提供一流的性能和可靠性。可提供阻断电压在200V至7.2kV
W2830HE520	LITTELFUSE	获取价格	Rectifier Diode,
W2830HE560	LITTELFUSE	获取价格	Rectifier Diode,
W2840QA180	LITTELFUSE	获取价格	我们种类繁多的整流器二极管可提供一流的性能和可靠性。可提供阻断电压在200V至7.2kV
W2840QA220	LITTELFUSE	获取价格	我们种类繁多的整流器二极管可提供一流的性能和可靠性。可提供阻断电压在200V至7.2kV
W2865HA680	LITTELFUSE	获取价格	我们种类繁多的整流器二极管可提供一流的性能和可靠性。可提供阻断电压在200V至7.2kV

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