Datasheet > CY2280

CY2280

更新时间： 2024-11-20 22:50:39

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
12页	155K
描述
100-MHz Pentium II Clock Synthesizer/Driver with Spread Spectrum for Mobile or Desktop PCs

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CY2280 数据手册

CY2280

100-MHz Pentium^®II Clock Synthesizer/Driver with

Spread Spectrum for Mobile or Desktop PCs

Features

Functional Description

The CY2280 is a Spread Spectrum clock synthesizer/driver for

• Mixed 2.5V and 3.3V operation

• Clock solution for Pentium® II, and other similar pro-

cessor-based motherboards

a Pentium II, or other similar processor-based PC requiring

100-MHz support. All of the required system clocks are provid-

ed in a space-saving 48-pin SSOP package. The CY2280 can

be used with the CY231x for a total solution for systems with

SDRAM.

The CY2280 provides the option of spread spectrum clocking

on the CPU and PCI clocks for reduced EMI. A downspread

percentage is introduced when the SEL_SS input is asserted.

The device can be run without spread spectrum when the

SEL_SS input is deasserted. The percentage of spreading is

EPROM-programmable to optimize EMI-reduction.

— Four 2.5V CPU clocks up to 100 MHz

— Eight 3.3V sync. PCI clocks, one free-running

— Two 3.3V 48-MHz USB clocks

— Three 3.3V Ref. clocks at 14.318 MHz

— Two 2.5V APIC clocks at 14.318 MHz or PCI/2

• EMI control

— Spread spectrum clocking

— Factory-EPROM programmable spread spectrum

margin

The CY2280 has power-down, CPU stop, and PCI stop pins

for power management control. The signals are synchronized

on-chip, and ensure glitch-free transitions on the outputs.

When the CPU_STOP input is asserted, the CPU clock out-

puts 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 refer-

ence oscillator and PLLs are shut down, and all outputs are

driven LOW.

— Factory-EPROM programmable output drive and

slew rate

• Factory-EPROM programmable CPU clockfrequencies

for custom configurations

• Available in space-saving 48-pin SSOP package

CY2280 Selector Guide

CY2280 Configuration Options

Clock Outputs

CPU (66.6, 100 MHz)

–1

–11S

–21S

PCI (CPU/2, CPU/3)

USB (48 MHz)

APIC (14.318 MHz)

APIC (PCI/2)

—

Reference (14.318 MHz)

CPU-PCI delay

1.5−4.0 ns

—

1.5−4.0 ns

—

1.5−4.0 ns

2.0–4.5 ns

−0.6%

CPU-APIC delay

Spread Spectrum (Downspread)

N/A

−0.6%

Logic Block Diagram

-1

-2

APIC [0:1]

V_DDAPIC

CPU_STOP

REF [0-2]

XTALIN

14.318

MHz

OSC.

V_DDREF

XTALOUT

CPU

PLL

STOP

CPUCLK [0-3]

V_DDCPU

LOGIC

Divider

PWR_DWN

PCICLK_F

V_DDPCI

SEL0

SEL1

SEL100

SEL_SS

Delay

EPROM

STOP

LOGIC

PCI [1-7]

V_DDPCI

PCI_STOP

SYS PLL

USBCLK [0:1]

V_DDUSB

Pentium is a registered trademark of Intel Corporation.

Cypress Semiconductor Corporation

Document #: 38-07207 Rev. *A

•

3901 North First Street

•

San Jose

•

CA 95134

•

408-943-2600

Revised December 08, 2002

12 3 4 5 6 7...12

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与CY2280相关器件

型号	品牌	获取价格	描述	数据表
CY22800	CYPRESS	获取价格	Universal Programmable Clock Generator (UPCG)
CY22800_07	CYPRESS	获取价格	Universal Programmable Clock Generator (UPCG)
CY22800-001A	CYPRESS	获取价格	Universal Programmable Clock Generator (UPCG)
CY22800-002A	CYPRESS	获取价格	Universal Programmable Clock Generator (UPCG)
CY22800-003A	CYPRESS	获取价格	Universal Programmable Clock Generator (UPCG)
CY22800-004A	CYPRESS	获取价格	Universal Programmable Clock Generator (UPCG)
CY22800-005A	CYPRESS	获取价格	Universal Programmable Clock Generator (UPCG)
CY22800-006A	CYPRESS	获取价格	Universal Programmable Clock Generator (UPCG)
CY22800-007A	CYPRESS	获取价格	Universal Programmable Clock Generator (UPCG)
CY22800-008A	CYPRESS	获取价格	Universal Programmable Clock Generator (UPCG)

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