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ICS650-36

Networking & PCI Clock Source

Integrated Circuit Systems 

ICS650-36

Networking & PCI Clock Source

Description

The ICS650-36 is a low cost frequency generator

designed to support networking and PCI applications.

Using analog/digital Phase Locked-Loop (PLL)

techniques, the device uses a standard fundamental

mode, inexpensive crystal input of 25 MHz to produce

four output clocks supporting LAN, PCI, and 100M

SDRAM functions.

The device also has a power down feature that

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

the PDTS pin is taken low.

Features

• Packaged in 16-pin TSSOP

• Available in Pb (lead) free package

• Replaces multiple crystals and oscillators

• Input crystal or clock frequency of 25 MHz

• Fixed reference output frequency of 25 MHz

• Selectable output frequencies of 33.3, 33.333, 50,

66.666, 100, and 125 MHz

• Duty cycle of 40/60

• Operating voltage of 3.3 V

• Advanced, low-power CMOS process

• Industrial and commercial temperature ranges

Block Diagram

3

S2:0

Select/

Control

Circuit

X1/ICLK

25 MHz

crystal

input X2

Crystal

Oscillator/

Clock

Buffer

External capacitors

may be required.

VDD

3

PLL1

PLL2

CLK1

CLK2

PLL3

3

GND

CLK3

REF

PDTS (all outputs and PLLs)

MDS 650-36 D

1

Revision 030206

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

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