ICS82C404M datasheet(1/13 Pages) ICST

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ICS82C404RevA111095

Integrated

Circuit

Systems, Inc.

ICS82C404

Advance Information

General Description

The ICS82C404 is a fully programmable graphics clock gen-

erator. It can generate user specified clock frequencies using

an externally generated input reference or by a single crystal.

The output frequency is programmed by entering a 24-bit

digital word through the serial port.

Two fully user-programmable phase-locked loops are offered

in a single package. One PLL is designed to drive the memory

clock, while the second drives the video clock. The outputs

may be changed on-the-fly to any desired frequency between

390 kHz and 120 MHz. The ICS82C404 is ideally suited for

any design where multiple or varying frequencies are required.

This part is ideal for graphics applications. It generates low

jitter, high speed pixel clocks. It can be used to replace

multiple, expensive high speed crystal oscillators. The flexi-

bility of the device allows it to generate non-standard graph-

ics clocks.

The leader in the area of multiple clock output clocks on a

single chip, ICS has been shipping graphics frequency gener-

ators since October, 1990, and is constantly improving the

phase-locked loop. The ICS82C404 incorporates a patented

fourth generation PLL that offers the best jitter performance

available.

Features

•• Pin-for-pin and function compatible with ICD’s version

of the 82C404

•• Dual programmable graphics clock generator

•• Memory and video clocks are individually programmable

“on-the-fly”

•• Ideal for designs where multiple or varying frequencies

are required

•• Increased frequency resolution from optional pre-divide-

by-2 on the M counter

•• Output enable feature available for tristating outputs

•• Independent clock outputs range from 390 kHz to

120 MHz

•• Operation up to 140 MHz available

•• Power-down capabilities

•• Low-power, high speed 0.8µ CMOS technology

•• Glitch-free transitions

•• Available in 16-pin PDIP or SOIC package

Dual Programmable Graphics Frequency Generator

Block Diagram

Số phần tương tự - ICS82C404M

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