ics9159-20 Holt Integrated Circuits, Inc., ics9159-20 Datasheet

ics9159-20

Manufacturer Part Number

ics9159-20

Description

Frequency Generator Sis551x Sis6205 Chip Systems

Manufacturer

Holt Integrated Circuits, Inc.

Datasheet

1.ICS9159-20.pdf (5 pages)

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Frequency Generator for SIS551X and SIS6205 Chip Set Systems

General Description

The ICS9159-20 is a low-cost frequency generator designed

specifically for SIS551X chip set and SIS6205 VGA control-

ler. The integrated buffer minimizes skew. A 14.31818 MHz

XTAL oscillator provides the reference clock to generate

standard Pentium™ frequencies. The CPU clock makes grad-

ual frequency transitions without violating the PLL timing

of internal microprocessor clock multipliers.

Both synchronous and asynchronous bus designs are sup-

ported. For chip sets that require an early CPU clock, the

buffers are driven by the CPU clock. In this configuration, the

CPU clock becomes the early clock and the output of the

uncommitted buffers become the bus synchronized bus clocks.

Block Diagram

9159-20 Rev B 040597

Integrated

Circuit

Systems, Inc.

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 information being relied upon by the customer is current

and accurate.

•

Applications

•

Functionality

3.3V±10%, 0-70°C

Crystal (X1, X2) = 14.318181 MHz

Features

All frequencies in MHz, assuming 14.318 MHz input.

FS1

One selectable CPU clocks operate up to 66.66 MHz

5 uncommitted buffers

Maximum CPU jitter of ±200ps

7 BUS clocks support sync or async bus operation

500ps skew window for all synchronous clock edges

Integrated buffer outputs drive up to 30pF loads

3.1V - 3.5V supply range

28-pin 300-mil SOIC package

Supports chip sets requiring early CPU clocking

Ideal for green Pentium and P6 PCI systems based on the

SIS5596 chip set

FS0

Pin Configuration

(MHz)

Tistate

14.318

REF

28-Pin SOIC

Tristate

(MHz)

66.66

CPU

Pentium is a trademark of Intel Corporation.

ICS9159-20

Tristate

BSEL=1 BSEL=0

33.33

BCLK (MHz)

Tristate

33.33

Related parts for ics9159-20

ics9159-20 Summary of contents

Page 1

... Systems, Inc. Frequency Generator for SIS551X and SIS6205 Chip Set Systems General Description The ICS9159- low-cost frequency generator designed specifically for SIS551X chip set and SIS6205 VGA control- ler. The integrated buffer minimizes skew. A 14.31818 MHz XTAL oscillator provides the reference clock to generate standard Pentium™ ...

Page 2

... ICS9159-20 Pin Descriptions PIN NUMBER PIN NAME 1, 8, 20, 26 VDD 11, 17, 23 GND 5 BSEL 10, 24 BOUT(0:4) 13, 12 FS(0:1) 15, 16, 18, 19, BCLK(0:6) 21, 22 REF Note: BCLK buffers cannot be supplied with 5 volts (Pins 14 and 20) if CPU and fixed frequencies (Pins 1, 8 and 26) are being supplied with 3 ...

Page 3

... REF CLKs =15mA; for CPUs & BUSes =-30mA; for CPUs & BUSes =12.5mA; for REF CLKS =-20mA; for REF CLKs OH OH @66.5 MHz; all outputs unloaded DD 3 ICS9159-20 +0 MIN TYP MAX UNITS - - 0. 0. -28.0 -10.5 - µA -5 ...

Page 4

... ICS9159-20 Electrical Characteristics at 3.3V ° 3.1 – 3 – PARAMETER SYMBOL 1 Rise Time 1 Fall Time 1 Rise Time 1 Fall Time 1 Duty Cycle 1 Jitter, One Sigma 1 Jitter, Absolute 1 Jitter, One Sigma 1 Jitter, Absolute 1 Input Frequency 1 Logic Input Capacitance 1 Crystal Oscillator Capacitance C 1 Power-on Time ...

Page 5

... 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 5 device data to verify that any information being relied upon by the customer is current and accurate. ICS9159-20 LEAD COUNT 28L DIMENSIONL 0.704 ...

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