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W245: Descriptionfrequency multiplying, peak reducing emi solution; File Size107KB，12 Pages; ManufacturerCypress Semiconductor

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frequency multiplying, peak reducing emi solution

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W245-30

Frequency Multiplying, Peak Reducing EMI Solution

Features

• Cypress PREMIS™ family offering

• Generates an EMI optimized clocking signal at the out-

put

• Selectable output frequency range

• Single 1.25%, 2.5%, 5% or 10% down or center spread

output

• Integrated loop filter components

• Operates with a 3.3 or 5V supply

• Low power CMOS design

• Available in 20-pin SSOP (Small Shrunk Outline Pack-

age)

Key Specifications

Supply Voltages:......................................... V

= 3.3V±0.3V

or V

= 5V±10%

Frequency range: ........................... 13 MHz < F

< 120 MHz

Cycle to Cycle Jitter: .........................................250 ps (max)

Output duty cycle: .................................40/60% (worst case)

Simplified Block Diagram

3.3V or 5.0V

Pin Configuration

[1, 2]

SSOP

XTAL

Input

W245-30

SDATA

SCLK

IIC Interface

Spread Spectrum

Output

(EMI suppressed)

AVDD

MW0^

SDATA

OR1^

SCLK

GND

OR2*

SSON#^

REFOUT

VDD

GND

IR1*

IR2*

SSOUT

MW1*

GND

VDD

MW2^

W245-30

3.3V or 5.0V

Oscillator or

Reference Input

W245-30

SDATA

IIC Interface

SCLK

Spread Spectrum

Output

(EMI suppressed)

Notes:

1. Pins marked with ^ are internal pull-down resistors with

weak 250 kΩ.

2. Pins marked with * are internal pull-up resistors with weak

80 kΩ.

Cypress Semiconductor Corporation

Document #: 38-07229 Rev. *B

•

3901 North First Street

•

San Jose

•

CA 95134 • 408-943-2600

Revised August 13, 2002

W245 Related Products

	W245	W245-30HT	W245-30H
Description	frequency multiplying, peak reducing emi solution	frequency multiplying, peak reducing emi solution	frequency multiplying, peak reducing emi solution

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