ICS9155C-01CW20T

ICS9155C-01CW20T Datasheet

The dual MHz clock outputs allows one output for the system and one to be the input to an ICS graphics frequency generator such as the AV9194.

Part	Datasheet
ICS9155C-01CW20T	ICS9155C-01CW20T (pdf)

Related Parts	Information
ICS9155C-01CW20	ICS9155C-01CW20

PDF Datasheet Preview
Integrated Circuit Systems, Inc. AV9155C Low Cost 20-Pin Frequency Generator The AV9155C is a low cost frequency generator designed specifically for desktop and notebook PC applications with either 3.3V or 5.0V power supply voltage. Its CPU clocks provide all necessary CPU frequencies for 286, 386 and 486 systems, including support for the latest speeds of processors. The device uses a MHz crystal to generate the CPU and all peripheral clocks for integrated desktop motherboards. The dual MHz clock outputs allows one output for the system and one to be the input to an ICS graphics frequency generator such as the AV9194. The CPU clock offers the unique feature of smooth, glitchfree transitions from one frequency to the next, making this ideal device to use whenever slowing the CPU speed. The AV9155C makes a gradual transition between frequencies, so that it obeys the Intel cycle-to-cycle timing specification for 486 systems. The simultaneous 2X and 1X CPU clocks offer controlled skew to within 1.5ns max of each other. ICS offers several versions of the AV9155C. The different devices are shown below: • Compatible with 286, 386, and 486 CPUs • Supports turbo modes • Generates communications clock, keyboard clock, floppy disk clock, system reference clock, bus clock and CPU clock • Output enable tristates outputs • Up to 100 MHz at 5V or 3.3V • 20-pin DIP or SOIC • All loop filter components internal • Skew-controlled 2X and 1X CPU clocks • Power-down option 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. The AV9155C is a third generation device, and uses ICS’s patented analog CMOS phase-locked loop technology for low phase jitter. ICS offers a broad family of frequency generators for motherboards, graphics and other applications, including cost-effective versions with only one or two output clocks. Consult ICS for all of your clock generation needs. PART AV9155C-01 AV9155C-02 AV9155C-23 AV9155C-36 Motherboard clock generator with 16 MHz BUS CLK Motherboard clock generator with 32 MHz BUS CLK Includes Pentium frequencies Features a special 40 MHz SCSI clock Block Diagram Pentium is a trademark of Intel Corporation. AV9155C Pin Configuration 20-Pin DIP or SOIC 20-Pin DIP or SOIC Pin Descriptions for AV9155C-01, -02 PIN NUMBER PIN NAME 16 MHz/32 MHz 24 MHz 12 MHz AGND 13 MHz 14 MHz 2XCPU TYPE Output Input Output Input Output Input MHz clock output. Crystal connection. Crystal connection. Digital power supply 3.3V or 5.0V . Digital Ground. 16 MHz -01 or 32 MHz -02 clock output. 24 MHz floppy disk/combination I/O clock output. 12 MHz keyboard clock output. Analog ground original version . Output enable. Tristates all outputs when low. Has internal pull-up. CPU clock frequency select Has internal pull-up. Power-down. Shuts off entire chip when low. Has internal pull-up. MHz reference clock output. MHz reference clock output. Digital ground. Digital power supply 3.3V or 5.0V . 2X CPU clock output. 1X CPU clock output. CPU clock frequency select Has internal pull-up. CPU clock frequency select Has internal pull-up. AV9155C Functionality - AV9155C-01 Using MHz input. All frequencies in MHz. CLOCK#2 CPU and 2XCPU FS2 Pin 11 FS1 Pin 19 Ordering Information AV9155C-02CN20, AV9155C-23CN20, AV9155C-36CN20 Example: ICS XXXX-PPP M X#W Lead Count & Package Width Lead Count=1, 2 or 3 digits W=.3” SOIC or DIP None=Standard Width Package Type N=DIP Plastic# T&R=Tape and Reel Pattern Number 2 or 3 digit number for parts with ROM code patterns Device Type consists of 3 or 4 digit numbers Prefix ICS, AV=Standard Device Notes Tape and reel packaging should be ordered with the suffix T&R. For instance, if the -01 in DIP and tape & reel is required, order the part as AV9155C-01CN20T&R. AV9155C LEAD COUNT DIMENSION L Ordering Information AV9155C-01CW20, AV9155C-02CM20, AV9155C-23CM20, AV9155C-36CM20 Example: ICS XXXX-PPP M X#W Lead Count & Package Width Lead Count=1, 2 or 3 digits W=.3” SOIC or DIP None=Standard Width Package Type W=SOIC T&R=Tape and Reel Pattern Number 2 or 3 digit number for parts with ROM code patterns Device Type consists of 3 or 4 digit numbers Prefix ICS, AV=Standard Device

PDF Datasheet Preview

Integrated Circuit Systems, Inc.

AV9155C

Low Cost 20-Pin Frequency Generator

The AV9155C is a low cost frequency generator designed specifically for desktop and notebook PC applications with either 3.3V or 5.0V power supply voltage. Its CPU clocks provide all necessary CPU frequencies for 286, 386 and 486 systems, including support for the latest speeds of processors. The device uses a MHz crystal to generate the CPU and all peripheral clocks for integrated desktop motherboards.

The dual MHz clock outputs allows one output for the system and one to be the input to an ICS graphics frequency generator such as the AV9194.

The CPU clock offers the unique feature of smooth, glitchfree transitions from one frequency to the next, making this ideal device to use whenever slowing the CPU speed. The AV9155C makes a gradual transition between frequencies, so that it obeys the Intel cycle-to-cycle timing specification for 486 systems. The simultaneous 2X and 1X CPU clocks offer controlled skew to within 1.5ns max of each other.

ICS offers several versions of the AV9155C. The different devices are shown below:
• Compatible with 286, 386, and 486 CPUs
• Supports turbo modes
• Generates communications clock, keyboard clock,
floppy disk clock, system reference clock, bus clock and CPU clock
• Output enable tristates outputs
• Up to 100 MHz at 5V or 3.3V
• 20-pin DIP or SOIC
• All loop filter components internal
• Skew-controlled 2X and 1X CPU clocks
• Power-down option

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. The AV9155C is a third generation device, and uses ICS’s patented analog CMOS phase-locked loop technology for low phase jitter. ICS offers a broad family of frequency generators for motherboards, graphics and other applications, including cost-effective versions with only one or two output clocks. Consult ICS for all of your clock generation needs.

PART AV9155C-01 AV9155C-02 AV9155C-23 AV9155C-36

Motherboard clock generator with 16 MHz BUS CLK

Motherboard clock generator with 32 MHz BUS CLK

Includes Pentium frequencies

Features a special 40 MHz SCSI clock

Block Diagram

Pentium is a trademark of Intel Corporation.

AV9155C

Pin Configuration
20-Pin DIP or SOIC
20-Pin DIP or SOIC

Pin Descriptions for AV9155C-01, -02

PIN NUMBER

PIN NAME
16 MHz/32 MHz
24 MHz
12 MHz

AGND
13 MHz
14 MHz
2XCPU

TYPE

Output Input

Output Input Output Input

MHz clock output. Crystal connection. Crystal connection. Digital power supply 3.3V or 5.0V . Digital Ground. 16 MHz -01 or 32 MHz -02 clock output. 24 MHz floppy disk/combination I/O clock output. 12 MHz keyboard clock output. Analog ground original version . Output enable. Tristates all outputs when low. Has internal pull-up. CPU clock frequency select Has internal pull-up. Power-down. Shuts off entire chip when low. Has internal pull-up. MHz reference clock output. MHz reference clock output. Digital ground. Digital power supply 3.3V or 5.0V . 2X CPU clock output. 1X CPU clock output. CPU clock frequency select Has internal pull-up. CPU clock frequency select Has internal pull-up.

AV9155C

Functionality - AV9155C-01

Using MHz input. All frequencies in MHz.

CLOCK#2 CPU and 2XCPU

FS2 Pin 11

FS1 Pin 19
Ordering Information

AV9155C-02CN20, AV9155C-23CN20, AV9155C-36CN20

Example:

ICS XXXX-PPP M X#W

Lead Count & Package Width Lead Count=1, 2 or 3 digits W=.3” SOIC or DIP None=Standard Width

Package Type N=DIP Plastic# T&R=Tape and Reel

Pattern Number 2 or 3 digit number for parts with ROM code patterns Device Type consists of 3 or 4 digit numbers Prefix

ICS, AV=Standard Device

Notes Tape and reel packaging should be ordered with the suffix T&R. For instance, if the -01 in DIP and tape & reel is required, order the part as AV9155C-01CN20T&R.

AV9155C

LEAD COUNT DIMENSION L
Ordering Information

AV9155C-01CW20, AV9155C-02CM20, AV9155C-23CM20, AV9155C-36CM20

Example:

ICS XXXX-PPP M X#W

Lead Count & Package Width

Lead Count=1, 2 or 3 digits

W=.3” SOIC or DIP None=Standard Width

Package Type

W=SOIC

T&R=Tape and Reel

Pattern Number 2 or 3 digit number for parts with ROM code patterns Device Type consists of 3 or 4 digit numbers Prefix

ICS, AV=Standard Device

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Datasheet ID: ICS9155C-01CW20T 636926