ICS307-03 datasheet(1/14 Pages) IDT

Part #	ICS307-03

Description	SERIALLY PROGRAMMABLE CLOCK SOURCE

PDF	14 Pages

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Manufacturer	IDT [Integrated Device Technology]

Direct Link	http://www.idt.com

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DATASHEET

SERIALLY PROGRAMMABLE CLOCK SOURCE

I CS3 0 7 -0 3

IDT® SERIALLY PROGRAMMABLE CLOCK SOURCE

1

ICS307-03

REV L 032911

Description

The ICS307-03 is a dynamic, serially programmable clock

source which is flexible and takes up minimal board space.

Output frequencies are programmed via a 3-wire SPI port.

An advanced PLL coupled to an array of configurable

output dividers and three outputs allows low-jitter

generation of frequencies from 200 Hz to 270 MHz.

The device can be reprogrammed during operation, making

it ideal for applications where many different frequencies

are required, or where the output frequency must be

determined at run time. Glitch-free frequency transitions,

where the clock period changes slightly over many cycles,

are possible.

Features

• Crystal or clock reference input

• 3.3 V CMOS outputs

• Three outputs can be individually configured or shut off

• Small 16-pin TSSOP package – Pb-free, RoHS

compliant

• Reprogrammable during operation

• 3-wire SPI serial interface

• Glitch-free output frequency switching

• User selectable charge pump current and damping

resistor

• Power-down control via hardware pin or software control

bit

• Programming word can be generated by IDT VersaClock

II Software

• Directly programmable via VersaClock II Software and a

Windows PC parallel port

• Industrial temperature range available

Block Diagram

REF Divide

1-2055

VCO DIVIDE

12-2055

Resistor

(Table 4)

Charge Pump

(Table 3)

(Table 2)

(Table 5)

CLK1

[Bit 110]

[Bit 123]

[Bit 124]

[Bit 129]

[Bit 111]

CLK2

CLK3

(Table 7)

Divider

2 - 8232

(Table 1)

X1

X2

[Bit 122]

Divider

2 - 34

Divider

2 - 34

(Table 6)

1

0

1

0

11pF

300

pF

CP

Programming

Register

(132 bits)

DIN

CS

SCLK

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