Datasheet > W42C32

W42C32

更新时间： 2024-11-04 22:14:47

品牌	Logo	应用领域
赛普拉斯 - CYPRESS		/
页数	文件大小	规格书
8页	134K
描述
Spread Spectrum Frequency Timing Generator

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数据手册

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W42C32 数据手册

W42C32-05

Spread Spectrum Frequency Timing Generator

Features

Key Specifications

• Maximized EMI suppression using Cypress’s Spread

Spectrum technology

• Generates a spread spectrum timing signal

• Reduces measured EMI by as much as 12 dB

• Integrated loop filter components

• Requires a single low-cost fundamental crystal (or

other frequency reference) for proper operation

• Special spread spectrum control functions

• Low-power CMOS design

Cycle-to-Cycle Jitter ....................................................250 ps

45/55 Duty Cycle.................................... approximately 1.4V

Selectable Frequency spread

2 ns rise/fall time 0.4V to 2.0V, 3.3V supply

2 ns rise/fall time 0.8V to 2.4V, 5.0V supply

Table 1. Frequency Spread Selection

W42C32-05

• Available in 16-pin SOIC package, (300 mil)

REFOUT

(MHz)

CLKOUT

(MHz)

VDD

(V)

FS2 FS1 FS0

Overview

22.1148

14.7456

44.2296 ±

2.5%

5.0

The W42C32 modulates the output of a single PLL in order to

‘spread’ the bandwidth of a synthesized clock and, more im-

portantly, decrease the peak amplitudes of its fundamental

harmonics. Since peak amplitudes are reduced, the radiated

electromagnetic emissions of the W42C32-05 are significantly

lower than the typical narrow band signal produced by oscilla-

tors and most frequency generators. Lowering a signal’s am-

plitude by increasing its bandwidth is a method of reducing

EMI called ‘spread spectrum frequency timing generation’.

This patented technique not only reduces the emissions of the

primary clock, but also impacts every signal synchronized to it.

44.2296

±1.5%

29.4912 ±

2.5%

18.432

14.318

18.432 ± 2.5%

66.66 – 2%

5.0

3.3

Reserved

14.318

100 – 2%

Reserved

Pin Configuration

SOIC

PD#

REFOUT

FS2

FS1

GND

SSON#

RESET

VDD

AGND

FS0

TEST

CLKOUT

AVDD

REFEN#

Cypress Semiconductor Corporation

•

3901 North First Street

•

San Jose

•

CA 95134

•

408-943-2600

September 28, 1999, rev. **

12 3 4 5 6 7 8

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