ICS512

LOCO™ PLL Clock Multiplier

MDS 512 C

1

Revision 061900

Printed 11/13/00

Integrated Circuit Systems, Inc. • 525 Race Street • San Jose •CA•95126•(408) 295-9800tel • www.icst.com

• Packaged as 8 pin SOIC or die

• Upgrade of popular ICS502 with:

- changed multiplier table

- higher operating frequencies

• Zero ppm multiplication error

• Easy to cascade with other 5xx series

• Input crystal frequency of 5 - 27 MHz

• Input clock frequency of 2 - 50 MHz

• Output clock frequencies up to 200 MHz

• Compatible with all popular CPUs

• Duty cycle of 45/55 up to 200 MHz

• Mask option for 9 selectable frequencies

• Operating voltages of 3.0 to 5.5V

• Industrial temperature version available

• Advanced, low power CMOS process

The ICS512 LOCO™ is the most cost effective

way to generate a high quality, high frequency

clock output and a reference clock from a lower

frequency crystal or clock input. The name LOCO

stands for LOw Cost Oscillator, as it is designed

to replace crystal oscillators in most electronic

systems. Using Phase-Locked-Loop (PLL)

techniques, the device uses a standard fundamental

mode, inexpensive crystal to produce output

clocks up to 200 MHz. With a reference output,

this chip plus an inexpensive crystal can replace two

oscillators.

Stored in the chip’s ROM is the ability to generate

nine different popular multiplication factors,

allowing one chip to output many common

frequencies (see page 2).

Block Diagram

Description

Features

Crystal or

clock input

X1/ICLK

X2

Optional crystal capacitors

CLK

Crystal

Oscillator

VDD GND

PLL

Clock

Synthesis

and Control

Circuitry

Output

Buffer

REF

Output

Buffer

S1, S0

2