Datasheet > CY2273A-4

CY2273A-4

更新时间： 2024-11-18 04:37:55

品牌	Logo	应用领域
赛普拉斯 - CYPRESS		驱动器电脑 PC 时钟
页数	文件大小	规格书
14页	168K
描述
Pentium㈢/II, 6x86, K6 Clock Synthesizer/Driver for Desktop PCs with Intel 82430TX, 82440LX or ALI IV/IV+, AGP and 3 DIMMs

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CY2273A-4 数据手册

CY2273A

Pentium®/II, 6x86,K6ClockSynthesizer/DriverforDesktopPCs

with Intel 82430TX, 82440LX or ALI IV/IV+, AGP and 3 DIMMs

The CY2273A possesses power-down, CPU stop, and PCI

Features

stop pins for power management control. These inputs are

multiplexed with SDRAM clock outputs, and are selected when

the MODE pin is driven low. Additionally, the signals are syn-

chronized on-chip, and ensure glitch-free transitions on the

outputs. When the CPU_STOP input is asserted, the CPU

clock outputs are driven LOW. When the PCI_STOP input is

asserted, 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 out-

puts are driven LOW.

• Mixed 2.5V and 3.3V operation

• Complete clock solution for Pentium®, Pentium® II,

Cyrix, and AMD processor-based motherboards

— Four CPU clocks at 2.5V or 3.3V

— Up to twelve 3.3V SDRAM clocks

— Seven synchronous PCI clocks, one free-running

— One 3.3V 48 MHz USB clock

— One 2.5V IOAPIC clock (-3 option only)

— Two AGP clocks at 60 or 66.6MHz (-2 option only)

— One 3.3V Ref. clock at 14.318 MHz

The CY2273A outputs are designed for low EMI emissions.

Controlled rise and fall times, unique output driver circuits and

factory-EPROM programmable output drive and slew-rate en-

able optimal configurations for EMI control.

• I C™ Serial Configuration Interface

• Factory-EPROM programmable output drive and slew

rate for EMI customization

• Factory-EPROM programmable CPU clock frequencies

for custom configurations

• Power-down, CPU stop and PCI stop pins

• Available in space-saving 48-pin SSOP package

CY2273A Selector Guide

Clocks Outputs

-1

-2

-3

-4

CPU (60, 66.6, 75,

83.3 MHz)

Functional Description

The CY2273A is a clock synthesizer/driver for a Pentium, Pen-

tium II, Cyrix, or AMD processor-based PC using Intel’s

82430TX, 82440LX, ALI Aladdin IV or Aladdin IV+ chipsets.

CPU (60, 66.6 MHz)

SDRAM

9/12

[1]

PCI (30, 33.3MHz)

USB/IR (48MHz)

AGP (60 or 66MHz)

IOAPIC (14.318MHz)

Ref (14.318MHz)

CPU-PCI delay

The CY2273A-1 outputs four CPU clocks at 2.5V or 3.3V with

up to 83.3MHz operation. There are seven PCI clocks, running

at 30 and 33.3MHz. One of the PCI clocks is free-running.

Additionally, the part outputs up to twelve 3.3V SDRAM clocks,

one 3.3V USB clock at 48 MHz, and one 3.3V reference clock

at 14.318 MHz. The CY2273A-2 is similar, except that

PCICLK4 and PCICLK5 are now AGP clocks. The CY2273A-3

is more suited to Pentium II systems, as it outputs one 2.5V

IOAPIC clock. Finally, the CY2273A-4 is similar to the

CY2273A-1 except that is supports 0-ns CPU-PCI delay.

1–5.5 ns 1–5.5 ns 0 ns

0 ns

Note:

1. One free-running PCI clock.

CY2273A-3 only

Logic Block Diagram

IOAPIC

V_DDQ2

REF0 (14.318 MHz)

XTALIN

14.318

MHz

OSC.

STOP

LOGIC

CPU

PLL

XTALOUT

CPUCLK [0-3]

V_DDCPU

SEL0

SEL1

CY2273A-1,-2,-4 only

SDRAM5/PWR_DWN

SDRAM [0-4],[8-11]

EPROM

SDRAM6/CPU_STOP

MODE

Delay (-1,-2 option)

SDRAM7/PCI_STOP

SYS PLL

/1 or /1.25

/1 or /2

CY2273A-2 only

AGP [0,1]

STOP

LOGIC

PCI [0-5], PCI [0-3]

PCICLK_F

SERIAL

INTERFACE

CONTROL

LOGIC

SCLK

USBCLK (48 MHz)

SDATA

Intel and Pentium are registered trademarks of Intel Corporation. I²C is a trademark of Philips Corporation.

Cypress Semiconductor Corporation

•

3901 North First Street

•

San Jose

•

CA 95134

•

408-943-2600

October 12, 1998

12 3 4 5 6 7...14

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与CY2273A-4相关器件

型号	品牌	获取价格	描述	数据表
CY2273APVC-1	CYPRESS	获取价格	Pentium㈢/II, 6x86, K6 Clock Synthesizer/Drive
CY2273APVC-1T	CYPRESS	获取价格	Processor Specific Clock Generator, 83.33MHz, CMOS, PDSO48, SSOP-48
CY2273APVC-2	CYPRESS	获取价格	Pentium㈢/II, 6x86, K6 Clock Synthesizer/Drive
CY2273APVC-2T	CYPRESS	获取价格	Processor Specific Clock Generator, 83.33MHz, CMOS, PDSO48, SSOP-48
CY2273APVC-3	CYPRESS	获取价格	Pentium㈢/II, 6x86, K6 Clock Synthesizer/Drive
CY2273APVC-3T	CYPRESS	获取价格	Processor Specific Clock Generator, 66.67MHz, CMOS, PDSO48, SSOP-48
CY2273APVC-4	CYPRESS	获取价格	Pentium㈢/II, 6x86, K6 Clock Synthesizer/Drive
CY2273APVC-4T	CYPRESS	获取价格	Processor Specific Clock Generator, 83.33MHz, CMOS, PDSO48, SSOP-48
CY2273PVC-1	ETC	获取价格	CPU System Clock Generator
CY2273PVC-2	ETC	获取价格	CPU System Clock Generator

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