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ICS291PG: DescriptionTriple PLL Field Prog. Spread Spectrum Clock Synthesizer; File Size106KB，8 Pages; ManufacturerICS ( IDT ); Websitehttp://www.icst.com

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Triple PLL Field Prog. Spread Spectrum Clock Synthesizer

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PRELIMINARY INFORMATION

ICS291

Triple PLL Field Prog. Spread Spectrum Clock Synthesizer

Description

The ICS291 field programmable spread spectrum clock

synthesizer generates up to six high-quality,

high-frequency clock outputs including multiple

reference clocks from a low-frequency crystal input. It

is designed to replace crystals, crystal oscillators and

stand alone spread spectrum devices in most

electronic systems.

Using ICS’ VersaClock

software to configure PLLs

and outputs, the ICS291 contains a One-Time

Programmable (OTP) ROM for field programmability.

Programming features include input/output

frequencies, spread spectrum amount, eight selectable

configuration registers and up to two sets of three

low-skew outputs.

Each of the two output groups are powered by a

separate VDDO voltage. VDDO may vary from 1.8 V to

VDD.

Using Phase-Locked Loop (PLL) techniques, the

device runs from a standard fundamental mode,

inexpensive crystal, or clock. It can replace multiple

crystals and oscillators, saving board space and cost.

The ICS291 is also available in factory programmed

custom versions for high-volume applications.

Features

•

Packaged as 20-pin TSSOP

Eight addressable registers

Replaces multiple crystals and oscillators

Output frequencies up to 200 MHz at 3.3 V

Configurable Spread Spectrum Modulation

Input crystal frequency of 5 to 27 MHz

Clock input frequency of 3 to 166 MHz

Up to six reference outputs

Separate 1.8 to 3.3 V VDDO output level controls for

each bank of 3 outputs

Up to two sets of three low-skew outputs

Operating voltages of 3.3 V

Controllable output drive levels

Advanced, low-power CMOS process

Available in Pb (lead) free packaging

Block Diagram

VDD

PLL1 with

Spread

Spectrum

Divide

Logic

and

Output

Enable

Control

VDDO1

S2:S0

OTP

ROM

with PLL

Values

CLK1

CLK2

CLK3

PLL2

CLK4

CLK5

CLK6

PLL3

X1/ICLK

Crystal or

Clock Input

Crystal

Oscillator

External capacitors

are required with a crystal input.

GND

PDTS

VDDO2

MDS 291 C

Integrated Circuit Systems, Inc.

●

525 Race Street, San Jose, CA 95126

●

Revision 062205

tel (408) 297-1201

●

www.icst.com

ICS291PG Related Products

	ICS291PG	ICS291PGLF	ICS291	ICS291PGI	ICS291PGILF
Description	Triple PLL Field Prog. Spread Spectrum Clock Synthesizer	Triple PLL Field Prog. Spread Spectrum Clock Synthesizer	Triple PLL Field Prog. Spread Spectrum Clock Synthesizer	Triple PLL Field Prog. Spread Spectrum Clock Synthesizer	Triple PLL Field Prog. Spread Spectrum Clock Synthesizer

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