ICS9169CF-231 ICST [Integrated Circuit Systems], ICS9169CF-231 Datasheet

ICS9169CF-231

Manufacturer Part Number

ICS9169CF-231

Description

Frequency Generator for Pentium Based Systems

Manufacturer

ICST [Integrated Circuit Systems]

Datasheet

1.ICS9169CF-231.pdf (8 pages)

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General Description

Block Diagram

Frequency Generator for Pentium™ Based Systems

The ICS9169C-231 is a low-cost frequency generator

designed specifically for Pentium and Pentium-Pro based

chip set systems. The integrated buffer minimizes skew

and provides all the clocks required. A 14.318 MHz XTAL

oscillator provides the reference clock to generate standard

Pentium frequencies. The CPU clock makes

frequency transitions without violating the PLL timing of

internal microprocessor clock

frequency setting of 68.5 MHz is available for Turbo-mode

of the 66.8 MHz CPU. The ICS9169C-231 contains 8 CPU

clocks, 6 PCI clocks, 1 REF at 48MHz and 1 at 24MHz.

Either synchronous (CPU/2) or asynchronous (32 MHz)

PCI bus operation can be selected by latching data on

BSEL input.

9169C-231RevB040697P

VDD Groups:

VDD1 = X1, X2, REF/BSEL

VDD2 = CPU1-6

VDD3 = CPU7-8 & PLL Core

VDD4 = BUS1-6

VDD5 = 48/24 MHz

Latched Inputs:

L1 = BSEL

L2 = FS0

L3 = FS1

L4 = FS2

Integrated

Circuit

Systems, Inc.

multipliers. A raised

gradual

3.3V±10%, 0-70

Crystal (X1, X2) = 14.31818 MHz

Functionality

FS2 FS1

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.

Pin Configuration

Features

•

ADD RESS

SEL ECT

Eight selectable CPU clocks operate up to 83.3 MHz

Frequency selections include Turbo-mode speed of

68.5 MHz

Maximum CPU jitter of ±200ps

Six BUS clocks support sync or async bus operation

250ps skew window for CPU outputs, 500ps skew

window for BUS outputs

CPU clocks to BUS clocks skew 1-4 ns (CPU early)

48 MHz clock for USB support & 24 MHz clock for FD.

Logic inputs latched at Power-On for frequency

selection saving pins as Input/Output

Integrated buffer outputs drive up to 30pF loads

3.0V - 3.7V supply range, CPU (1:8) outputs 2.5V

(2.375 - 2.6V) VDD option

28-pin SOIC or SSOP package

FS0

28-Pin SOIC or SSOP

CP U(1:8)

(MHz)

66.8

75.9

83.3

68.5

BSEL=1 BSEL=0

34.25

BU S (1:6)MHz

33.4

27.5

37.5

41.7

Pentium is a trademark of Intel Corporation.

ICS9169C-231

48MHz 24MHz

RE F

REF

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ICS9169CF-231 Summary of contents

Page 1

Integrated Circuit Systems, Inc. Frequency Generator for Pentium™ Based Systems General Description The ICS9169C-231 is a low-cost frequency generator designed specifically for Pentium and Pentium-Pro based chip set systems. The integrated buffer minimizes skew and provides all the clocks required. ...

Page 2

ICS169C-231 Pin Descriptions PIN NUMBER PIN NAME 1 VDD1 4,11,16,22 GND 6,7,9,10,15 CPU(2,3,4,5,8) CPU1, CPU6, 5,12,13 CPU7 5,12,13 FS (0:2) 8 VDD2 14 VDD3 17,18,20,21,23, 24 BUS(1:6) 19 VDD4 25 VDD5 26 24 MHz 27 48 ...

Page 3

Shared Pin Operation - Input/Output Pins Shared Pin Operation - Input/Output, Pins 5, 28, 12 and 13 on the ICS9169C-231 serve as dual signal functions to the device. During initial power-up, they act as input pins. The logic level (voltage) ...

Page 4

ICS169C-231 Fig. 2a Fig Fig. 2b ...

Page 5

Technical Pin Function Descriptions VDD1 This is the power supply to the internal logic of the device as well as the following clock output buffers: A. REF clock output buffers B. BUS clock output buffers C. Fixed clock output buffers ...

Page 6

ICS169C-231 Absolute Maximum Ratings Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . 7.0 V Logic Inputs . . . . ...

Page 7

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 8

... H 0.301 0.307 L 0.025 0.030 N See Variations 0° 4° Ordering Information ICS9169CF-231 ICS9169CM-231 Example: ICS XXXX F - PPP Pattern Number ( digit number for parts with ROM code patterns) PackageType F=SSOP M=SOIC Device Type (consists digit numbers) Prefix SOIC Package SSOP VARIATIONS MAX ...

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