ICST ICS9169CF-36 Datasheet

Integrated
Circuit
Systems, Inc.

Low Cost 20-Pin Frequency Generator

ICS9169C-36

Description

The ICS9169C-36 generates the I/O clocks needed as a satellite
clock generator to a CPU and PCI clock source (such as the
ICS9148-01 or ICS9150-01). This device can generate the
audio Codec or DSP clocks if required (or Stop those outputs
Low).

The device is nominally driven at the X1 pin by a 14.31818
MHz clock source. The device can also be driven by a crystal
using external load capacitors as a stand-alone generator.
The SREF0 output is a reference clock output which is stronger
to allow multiple ISA slots.

Block Diagram

Features

• Generator for periphary clock chips as companion
device to CPU/SDRAM/PCI generator .

• Accepts clock input at X1 pin or crystal across X1,
X2 pins as 14.31818 MHz nominal inputs.

• Three REF clock buffer outputs (SREF is Strong)

• Two 48MHz and one 24 MHz outputs

• Selectable audio clock generator with audio (Audio)
and half speed (Audio/2) outputs

• 20 pin (209 mil) SSOP package

Pin Configuration

Functionality

3.3V±10%, 0-70°C
Clock source driving X1 pin or crystal (X1, X2) = 14.31818 MHz
(all frequencies in MHz)

FS1 FS0 AUDIO AUDIO/2 SREF, REF 48 MHz 24 MHz

0 0 XTAL/2 XTAL/4 14.318 XTAL/2 XTAL/4
0 1 24. 5795 12.2898 14.318 48.008 24. 004
1 0 33. 8680 16.9340 14.318 48.008 24. 004
1 1 LOW LOW 14.318 48.008 24. 004

ICS reserves the right to make changes in the device data identified in this publication

ICS9169C-36RevD060197P

without further notice. ICS advises its customers to obtain the latest version of all
device data to verify that any information being relied upon by the customer is current
and accurate.

20-Pin SSOP

OE All Outputs

0 Tristate
1 Active

ICS9169C-36

Pin Descriptions

PIN NUMBER PIN NAME TYPE DESCRIPTION

1, 8, 13, 18 VDD PWR 3.3V I/O power supply

2X1IN

3 X2 OUT Crystal output (no connect for non-crystal applications)

4, 11, 16 GND Ground Ground

5 OE IN Output enable (Tri-states all outputs when held low). Has pullup
6 AUDIO OUT 3.3V Audio clock, runs per select table
7 AUDIO/2 OUT 3.3V Audio clock, runs per select table

9, 10 FS0, FS1 IN Frequency mode select pins. Has pullup.

12 24 MHz OUT 3.3V clock, runs @ 24 MHz

14, 15 48 MHz (0:1) OUT 3.3V Clock, runs @ 48 MHz
19, 20

17 SREF0 OUT Strong reference clock OUT 3.3V clock, runs @ 1x X1

REF1, REF2

(1:2)

14.318MHz input (requires external components for feedback
resistor and load capacitors to be used with a crystal)

OUT 3.3V clock, runs @ 1x X1

2