ICS308R datasheet(1/8 Pages) ICST

Part #	ICS308R

Description	SERIAL PROGRAMMABLE QUAD PLL VERSACLOCK SYNTHESIZER

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Manufacturer	ICST [Integrated Circuit Systems]

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ICS308

MDS 308 F

1

Revision 090704

Integrat ed Circuit Systems ● 5 25 Race Stre et, San Jo se, CA 9 5126 ● te l (40 8 ) 2 97-12 01 ● www.ics t.co m

SERIAL PROGRAMMABLE QUAD PLL VERSACLOCK SYNTHESIZER

Description

The ICS308 is a versatile serially programmable, quad

PLL clock source. The ICS308 can generate any

frequency from 250 kHz to 200 MHz, and up to 6

different output frequencies simultaneously. The

outputs can be reprogrammed on the fly, and will lock to

a new frequency in 10 ms or less. Smooth transitions

(in which the clock duty cycle remains roughly 50%) are

guaranteed if the output divider is not changed.

The device includes a PDTS pin which tri-states the

output clocks and powers down the entire chip.

The ICS308 default for non-programmed start-up are

buffered reference clock outputs on all clock output

pins.

Features

• Packaged in 20-pin SSOP (QSOP)

• Operating voltage of 3.3 V

• Highly accurate frequency generation

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

• Serially programmable: user determines the output

frequency via a 3-wire interface

• Eliminates need for custom quartz oscillators

• Input crystal frequency of 5 - 27 MHz

• Optional programmable on-chip crystal capacitors

• Output clock frequencies up to 200 MHz

• Reference clock output

• Power down tri-state mode

• Very low jitter

Block Diagram

C rystal

O scillator

GN D

2

3

VDD

PDT S

PLL2

PLL3

Divide

Logic

and

Output

Enable

Control

SCLK

DATA

CLK1

CLK9

CLK8

CLK7

CLK6

CLK5

CLK4

CLK3

CLK2

PLL4

PLL1

X2

Cry stal or

cloc k input

E xternal capacitors are

required w ith a crystal input.

X 1/IC LK

STROBE

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