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345R-XXLF
(Rev.:2013)

TRIPLE PLL FIELD PROGRAMMABLE SS VERSACLOCK SYNTHESIZER

Integrated Device Technology 

DATASHEET

TRIPLE PLL FIELD PROGRAMMABLE SS VERSACLOCK SYNTHESIZER I CS3 4 5

Description

The ICS345 field programmable clock synthesizer

generates up to nine high-quality, high-frequency clock

outputs including multiple reference clocks from a

low-frequency crystal or clock input. It is designed to

replace crystals and crystal oscillators in most electronic

systems.

Using IDT’s VersaClockTM software to configure PLLs and

outputs, the ICS345 contains a One-Time Programmable

(OTP) ROM to allow field programmability. Programming

features include eight selectable configuration registers, up

to two sets of four low-skew outputs, and optional Spread

Spectrum outputs.

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 ICS345 is also available in factory programmed custom

versions for high-volume applications.

Features

• Packaged as 20-pin SSOP (QSOP) (Pb-free)

• Spread spectrum capability

• 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

• Input clock frequency of 2 to 50 MHz

• Up to nine reference outputs

• Up to two sets of four low-skew outputs

• Operating voltages of 3.3 V

• Advanced, low-power CMOS process

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

clocks, see the ICS342. For three output clocks, see the

ICS343. For more than three outputs, see the ICS348.

Block Diagram

VDD 3

3

S2:S0

OTP

ROM

w ith

PLL

V a lu e s

Crystal or

clock input

X1/ICLK

X2

Crystal

O s c illa to r

PLL1 with

Spread

S p e c tru m

PLL2

PLL3

Divide

Logic

and

O u tp u t

E n ab le

Control

CLK1

CLK2

CLK3

CLK4

CLK5

CLK6

CLK7

CLK8

CLK9

External capacitors are

required with a crystal input.

GND 2

PDTS

IDT® TRIPLE PLL FIELD PROGRAMMABLE SS VERSACLOCK SYNTHESIZER

1

ICS345

REV P 090613

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