Datasheet > 557-05A

557-05A

更新时间： 2024-11-21 14:58:11

品牌	Logo	应用领域
瑞萨 - RENESAS		PC
页数	文件大小	规格书
13页	340K
描述
Quad Differential PCI-Express GEN1 Clock Source

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557-05A 数据手册

DATASHEET

QUAD DIFFERENTIAL PCI-EXPRESS GEN1 CLOCK SOURCE

ICS557-05A

Description

Features

The ICS557-05A is a spread-spectrum clock generator that

supports PCI-Express requirements. It is used in PC or

embedded systems to substantially reduce

electro-magnetic interference (EMI). The device provides

four differential HCSL or LVDS high-frequency outputs with

spread spectrum capability. The output frequency and

spread type are selectable using external pins.

• Packaged in 20-pin TSSOP

• RoHS 5 (green) or RoHS 6 (green and lead free)

complaint package

• Supports PCI-Express applications

• Four differential spread spectrum clock outputs

• Spread spectrum for EMI reduction

• Uses external 25 MHz clock or crystal input

• Power down pin turns off chip

• OE control tri-states outputs

• Spread and frequency selection via external pins

• Spread Bypass option available

• Industrial temperature range available

• For PCIe Gen2 applications, see the 5V41066

• For PCIe Gen3 applications, see the 5V41236

Block Diagram

VDD

Spread

Spectrum/

Output

Spread

Spectrum

Circuitry

SEL[2:0]

clock

selection

CLKOUTA

CLKOUTB

25 MHz

crystal or

clock

Clock

Oscillator

PLL Clock

Synthesis

CLKOUTB

CLKOUTC

CLKOUTD

Optional tuning crystal

capacitors

CLKOUTD

Rr(IREF)

GND

IDT® QUAD DIFFERENTIAL PCI-EXPRESS GEN1 CLOCK SOURCE

ICS557-05A REV O 112111

12 3 4 5 6 7...13

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