ICS9154A-27CS16 IDT, Integrated Device Technology Inc, ICS9154A-27CS16 Datasheet

ICS9154A-27CS16

Manufacturer Part Number

ICS9154A-27CS16

Description

IC FREQUENCY GENERATOR 16-SOIC

Manufacturer

IDT, Integrated Device Technology Inc

Type

Frequency Generatorr

Datasheet

1.ICS9154A-27CS16T.pdf (11 pages)

Specifications of ICS9154A-27CS16

Input

Clock, Crystal

Output

Clock

Frequency - Max

140MHz

Voltage - Supply

3 V ~ 5.5 V

Operating Temperature

0°C ~ 70°C

Mounting Type

Surface Mount

Package / Case

16-SOIC

Frequency-max

140MHz

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

Other names

9154A-27CS16

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

ICS9154A-27CS16LF

Manufacturer:

Exar

Quantity:

1 110

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General Description

The 9154A is a 0.8mm version of the industry leading 9154.

Like the 9154, the 9154A is a low-cost frequency generator

designed for general purpose PC and disk drive applications.

However, because the 9154A uses 0.8mm technology and

the latest phase-locked loop architecture, it offers

performance advantages that enable the device to be sold

into Pentium™ systems.

The 9154A guarantees a 45/55 duty cycle over all

frequencies. In addition, a worst case jitter of ±250ps is

specified at Pentium frequencies.

The CPU clock offers the unique feature of smooth, glitch-

free transitions from one frequency to the next, making this

the ideal device to use when slowing the CPU speed. The

9154A makes a gradual transition between frequencies so

that it obeys the Intel cycle-to-cycle timing specifications for

486 and Pentium systems.

The 9154A-42 and 9154A-43 devices offer features

specifically for green PCs. The 9154A-42 and -43 have a

single pin that, when pulled low, will smoothly slow the 2XCPU

clock to 8 MHz. This is ideal for dynamic DX microprocessors.

The 9154A-43 not only has the slow clock feature, but also

offers a glitch-free stop clock for static SX microprocessors.

The STOPCLK# pin, when pulled low, enables the 2XCPU

clock to go low only after completing its last full cycle. The

clock continues to run internally, and will be output again on

the first full cycle immediately following stop clock disable.

The simultaneous 2X and 1X CPU clocks offer controlled

skew to within 500ps of each other (-42 only).

ICS has been shipping motherboard frequency generators

since April 1990, and is the leader in the area of multiple

output clocks on a single chip. Consult ICS for all your clock

generation needs.

0174E—03/18/08

Block Diagram

Integrated

Circuit

Systems, Inc.

Low-Cost 16-Pin Frequency Generator

Features

•

Applications

Computer motherboards: The 9154A replaces crystals and

oscillators, saving board space, component cost, part count

and inventory costs. It produces a switchable CPU clock and

up to four fixed clocks to drive floppy disk, communications,

super I/O, Bus, and/or keyboard devices. The small package

and 3.3V operation is perfect for handheld computers.

Compatible with 386, 486 and Pentium CPUs

45/55 Duty cycle

Runs up to 66 MHz at 3.3V

Single pin can slow clock to 8 MHz (on -42 and -43)

Single pin can stop the CPU clock glitch-free (on -43)

Very low jitter, ±250ps for Pentium frequencies

1X and 2X CPU clocks skew controlled to ±250ps (-42

only)

Smooth transitions between all CPU frequencies

Slow frequency ramp at power-on avoids CPU lock-up

16-pin 150-mil skinny SOIC packages

0.8µm CMOS technology

9154A

Related parts for ICS9154A-27CS16

ICS9154A-27CS16 Summary of contents

Page 1

Integrated Circuit Systems, Inc. Low-Cost 16-Pin Frequency Generator General Description The 9154A is a 0.8mm version of the industry leading 9154. Like the 9154, the 9154A is a low-cost frequency generator designed for general purpose PC and disk drive applications. ...

Page 2

Integrated Circuit Systems, Inc. Pin Configuration 16-SOIC 9154A-27CS16 16-SOIC 9154A-04CS16 0174E—03/18/08 16-SOIC 9154A-42CS16 Description of new pin: SLOWCLK# forces 2XCPUCLK output to ramp smoothly to 8MHz and CPUCLK output to 4 MHz when pulled low. 16-SOIC 9154A-26CS16 2 9154A 16-SOIC ...

Page 3

Integrated Circuit Systems, Inc. Stop Clock Feature The 9154A-43 incorporates a unique stop clock feature compatible with static logic processors. When the stop clock pin goes low, the 2XCPUCLK will go low after the next occurring falling edge. When STOPCLK ...

Page 4

Integrated Circuit Systems, Inc. Pin Descriptions Frequencies based upon 14.318 MHz input) PIN NUMBER -4 -10 -26 -27 - ...

Page 5

Integrated Circuit Systems, Inc. (using 14.318 MHz input, all frequencies in MHz) FS2 FS1 FS0 (using ...

Page 6

Integrated Circuit Systems, Inc. Absolute Maximum Ratings V referenced to GND .......................................................................... 7 Voltage on I/O pins referenced to GND . . . . . . . GND - 0 VDD + 0.5 V Operating Temperature ...

Page 7

Integrated Circuit Systems, Inc. Electrical Characteristics at 3 3.3 V ± 10 unless otherwise stated ...

Page 8

Integrated Circuit Systems, Inc. Electrical Characteristics at 5 ± 10 unless otherwise stated ...

Page 9

Integrated Circuit Systems, Inc. Electrical Characteristics at 5 ±10 unless otherwise stated ...

Page 10

Integrated Circuit Systems, Inc. 0.031 0.390 0.024 0.016 Ordering Information 9154A-04CS16 9154A-27CS16 9154A-10CS16 9154A-42CS16 Example: 9154A - PPC 0174E—03/18/08 0.063 0.050 0.006±0.004 16-Pin SOIC Package 9154A-43CS16 Lead Free, RoHS Compliant (Optional) Lead Count Package Type S = ...

Page 11

Integrated Circuit Systems, Inc. Revision History Rev. Issue Date Description C 4/6/2006 Added LF Ordering Information D 1/24/2008 Removed DIP Ordering Information. E 3/18/2008 Removed reference to "AV". 0174E—03/18/08 11 9154A Page # ...

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