ICS9159M-05 ICST [Integrated Circuit Systems], ICS9159M-05 Datasheet

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ICS9159M-05

Manufacturer Part Number
ICS9159M-05
Description
Manufacturer
ICST [Integrated Circuit Systems]
Datasheet
Frequency Generator for Pentium
General Description
The ICS9159-05 is a low cost frequency generator designed
specifically for Pentium/Pentium Pro systems. The integrated
buffer minimizes skew and provides the early CPU clock required
by some chipsets such as the OPTi VIPER. A 14.318 MHz
XTAL oscillator provides the reference clock to generate
standard Pentium frequencies. The CPU clock makes gradual
frequency transitions without violating the PLL timing of
internal micro-processor clock multipliers.
The synchronous bus frequencies are selectable as CPU for
local bus or CPU/2 for PCI bus support. Green PC systems
are supported through power-down, doze, and glitch-free
stop clock modes.
Block Diagram
9159-05 Rev F 9/29/98
ICS reserves the right to make changes in the device data identified in this publication
without further notice. ICS advises its customers to obtain the latest version of all
device data to verify that any
Applications
Features
Four CPU clocks operate up to 66.6 MHz at 3.3V with
glitch-free start and stop plus smooth transitions
3-6ns early CPU clock supports OPTi VIPER systems
Selection of 6 frequencies, tristate, or power-down
Six BUS clocks support local PCI bus operation
Skew window between synchronous outputs
Integrated buffer outputs drive up to 30pF loads
3.0V - 3.7V supply range
28-pin DIP or 28-pin 300-mil SOIC package
Ideal for green Pentium/Pentium Pro and 486 PCI
systems such as Pentium, PowerPC
/OPTi VIPER Systems
Pin Configuration
28-Pin 300-mil SOIC
Pentium is a trademark of Intel Corporaton.
PowerPC is a trademark of Motorola Corporation.
ICS9159-05
etc.

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ICS9159M-05 Summary of contents

Page 1

Frequency Generator for Pentium General Description The ICS9159- low cost frequency generator designed specifically for Pentium/Pentium Pro systems. The integrated buffer minimizes skew and provides the early CPU clock required by some chipsets such as the OPTi VIPER. ...

Page 2

ICS9159-05 Functionality Assuming 14.318 MHz input, all frequencies in MHz. 14 MHz=14.318 MHz STOP# BSEL# DOZE# FS0 Select ...

Page 3

Pin Descriptions PIN PIN NAME NUMBER 8, 20, 26 VDD 11, 23, 17 GND CPU(0: FS(0:1) 10 ECPU 15, 16, 18, BUS(0:5) 19,21 DOZE BSEL# ...

Page 4

ICS9159-05 Absolute Maximum Ratings Supply Voltage .......................................................................................................... 7.0 V Logic Inputs ....................................................................... GND –0 Ambient Operating Temperature ............................................................. 0°C to +70°C Storage Temperature ........................................................................... –65°C to +150°C Stresses above those listed under Absolute Maximum Ratings may cause ...

Page 5

Electrical Characteristics at 3.3V ° 3.0 – 3 – unless otherwise stated DD A PARAMETER SYMBOL 1 Rise Time 1 Fall Time 1 Rise Time 1 Fall Time 1 Duty Cycle 1 ...

Page 6

ICS9159-05 Ordering Information ICS9159N-05 Example: ICS XXXX N-PPP 28-Pin DIP Package Pattern Number digit number for parts with ROM code patterns) Package Type N=DIP (Plastic) Device Type (consists digit numbers) Prefix ICS=Standard Device 6 ...

Page 7

... Ordering Information ICS9159M-05 Example: ICS XXXX M-PPP Pattern Number digit number for parts with ROM code patterns) Package Type Device Type (consists digit numbers) Prefix SOIC Package M=SOIC, SOP ICS=Standard Device ICS reserves the right to make changes in the device data identified in this publication 7 without further notice ...

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