ICS271PGLF datasheet(1/8 Pages) ICST

Part #	ICS271PGLF

Description	Triple PLL Field Programmable VCXO Clock Synthesizer

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Manufacturer	ICST [Integrated Circuit Systems]

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ICS271

MDS 271 A

1

Revision 040705

Integrated Circuit Systems, Inc.

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

Triple PLL Field Programmable VCXO Clock Synthesizer

PRELIMINARY INFORMATION

Description

The ICS271 field programmable VCXO 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 and crystal oscillators in

most electronic systems.

Using ICS’ VersaClockTM software to configure PLLs

and outputs, the ICS271 contains a One-Time

Programmable (OTP) ROM for field programmability.

Programming features include VCXO, 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 VCXOs,

multiple crystals and oscillators, saving board space

and cost.

The ICS271 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

• Input crystal frequency of 5 to 27 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

Voltage

Controlled

Crystal

Oscillator

GND

2

3

VDD

PDTS

PLL2

PLL3

Divide

Logic

and

Output

Enable

Control

S2:S0

CLK1

CLK6

CLK5

CLK4

CLK3

CLK2

3

OTP

ROM

with

PLL

Values

X2

Crystal

External capacitors

are required.

X1

PLL1

VIN

VDDO1

VDDO2

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