ICS343MIP datasheet(1/7 Pages) ICST

Part #	ICS343MIP

Description	Field Programmable Triple Output SS VersaClock Synthesizer

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Manufacturer	ICST [Integrated Circuit Systems]

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ICS343

MDS 343 F

1

Revision 090704

Integrated Circuit Systems, Inc.

● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com

Field Programmable Triple Output SS VersaClock Synthesizer

Description

The ICS343 is a low cost, triple-output, field program-

mable clock synthesizer. The ICS343 can generate

three output frequencies from 250 kHz to 200 MHz,

using up to three independently configurable PLLs.

The outputs may employ Spread Spectrum techniques

to reduce system electro-magnetic interference (EMI).

Using ICS’ VersaClock™ software to configure the PLL

and output, the ICS343 contains a One-Time Program-

mable (OTP) ROM to allow field programmability. Using

Phase-Locked Loop (PLL) techniques, the device runs

from a standard fundamental mode, inexpensive crys-

tal, or clock. It can replace multiple crystals and oscilla-

tors, saving board space and cost.

The device also has a power down feature that

tri-states the clock outputs and turns off the PLLs when

the PDTS pin is taken low.

The ICS343 is also available in factory-programmed

custom versions for high-volume applications.

Features

• 8-pin SOIC package

• Highly accurate frequency generation

• M/N Multiplier PLL: M = 1...2048, N = 1...1024

• Output clock frequencies up to 200 MHz

• Spread spectrum capability for lower system EMI

• Center or Down Spread up to 4% total

• Selectable 32 kHz or 120 kHz modulation

• Input crystal frequency from 5 to 27 MHz

• Input clock frequency from 2 to 50 MHz

• Operating voltage of 3.3 V, using advanced, low

power CMOS process

• For one output clock, use the ICS341. For two output

clocks, see the ICS342. For more than three outputs,

see the ICS345 or ICS348.

• Available in Pb (lead) free packaging

Block Diagram

Crystal

Oscillator

PDTS (both outputs and PLL)

OTP ROM

with PLL

Divider

Values

VDD

GND

CLK1

CLK3

CLK2

PLL Clock Synthesis,

Spred Spectrum and

Control Circuitry

X2

Crystal or

clock input

External capacitors are

required with a crystal input.

X1/ICLK

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Integrated Circuit Syst...	ICS345	153Kb / 7P	Triple PLL Field Programmable SS VersaClock Synthesizer
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Integrated Circuit Syst...	ICS342	151Kb / 7P	FIELD PROGRAMMABLE DUAL OUTPUT SS VERSACLOCK SYNTHESIZER
Integrated Circuit Syst...	ICS252	153Kb / 9P	Field Programmable Dual Output SS VersaClock Synthesizer
Integrated Device Techn...	ICS252	115Kb / 10P	FIELD PROGRAMMABLE DUAL OUTPUT SS VERSACLOCK SYNTHESIZER
Integrated Circuit Syst...	ICS341	152Kb / 7P	Field Programmable SS VersaClock Synthesizer
Integrated Device Techn...	ICS252	210Kb / 11P	FIELD PROGRAMMABLE DUAL OUTPUT SS VERSACLOCK SYNTHESIZER
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