ICST AV9155C-36CN20, AV9155C-36CM20, AV9155C-23CN20, AV9155C-23CM20, AV9155C-02CN20 Datasheet

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Integrated Circuit Systems, Inc.
General Description Features
AV9155C
Block Diagram
AV9155C Rev F 12/13/00
Low Cost 20-Pin Frequency Generator
The dual 14.318 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 of fers 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.
Pentium is a trademark of Intel Corporation.
TRAPNOITPIRCSED
10-C5519VAKLCSUBzHM61htiwrotarenegkcolcdraobrehtoM 20-C5519VAKLCSUBzHM23htiwrotarenegkcolcdraobrehtoM 32-C5519VAmuitnePsedulcnI
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seicneuqerf
63-C5519VAkcolcISCSzHM04laicepsaserutaeF
2
A V9155C
Pin Configuration
20-Pin DIP or SOIC
20-Pin DIP or SOIC
Pin Descriptions for A V9155C-01, -02
NIP
REBMUN
EMANNIPEPYTNOITPIRCSED
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3
AV9155C
Functionality - A V9155C-01
(Using 14.318 MHz input. All frequencies in MHz.) CLOCK#2 CPU and 2XCPU
*VDD minimum 3.15V.
PERIPHERAL CLOCKS
REFERENCE CLOCKS
Functionality - A V9155C-02
(Using 14.318 MHz input. All frequencies in MHz.) CLOCK#2 CPU and 2XCPU
* VDD minimum 3.15V
PERIPHERAL CLOCKS
REFERENCE CLOCKS
Frequency Transitions
A key feature of the AV9155C is its ability to provide smooth, glitch-free frequency transitions on the CPU and 2XCPU clocks when the frequency select pins are changed. These frequency transitions do not violate the Intel 486 specification of less than 0.1% frequency change per clock period.
Using an Input Clock as Reference
The AV9155C is designed to accept a 14.318 MHz crystal as the input reference. With some external changes, it is possible to use a crystal oscillator or clock input. Please see application note AN04 for details on driving the AV9155C with a clock.
KLCMMOC
)1niP(
KLCSUB
)6niP(
KLCDF
)7niP(
KLCBK
)8niP(
348.1614221
KLCMMOC
)1niP(
KLCSUB
)6niP(
KLCDF
)7niP(
KLCBK
)8niP(
348.1234221
1KLCFER
)31niP(
2KLCFER
)41niP(
813.41813.41
1KLCFER
)31niP(
2KLCFER
)41niP(
813.41813.41
2SF
)11niP(
1SF
)91niP(
0SF
)02niP(
UPCX2
)71niP(
UPC
)81niP(
0 0 0 0
1 1 1 1
0 0
1
1 0 0
1
1
0
1
0
1
0
1
0
1
8
61 23 04 05
66.66
*08
*001
4 8
61 02 52
33.33 *04 *05
2SF
)11niP(
1SF
)91niP(
0SF
)02niP(
UPCX2
)71niP(
UPC
)81niP(
0 0 0 0 1 1 1 1
0 0 1 1 0 0 1 1
0
1
0
1
0
1
0
1
8
61
23 04 05
66.66
*08
*001
4 8
61 02 52
33.33 *04 *05
4
A V9155C
Pin Configuration
Pin Descriptions for A V9155C-23, -36
20-Pin DIP or SOIC
20-Pin DIP or SOIC
NIP
REBMUN
NIP
EMAN
EPYTNOITPIRCSED
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5
AV9155C
CLOCK#2 CPU and 2XCPU
*V
DD
minimum 3.15V
PERIPHERAL CLOCKS
REFERENCE CLOCKS
CLOCK#2 CPU and 2XCPU
*VDD minimum 3.15V
PERIPHERAL CLOCKS
REFERENCE CLOCKS
KLCMMOC
)1niP(
niP(KLCSUB
)6
KLCDF
)7niP(
KLCBK
)8niP(
348.1614221
KLCISCS
)1niP(
niP(KLCSUB
)6
KLCDF
)7niP(
KLCBK )8niP(
04514221
1KLCFER
)31niP(
2KLCFER
)41niP(
813.41813.41
1KLCFER
)31niP(
2KLCFER
)41niP(
813.41813.41
2SF
)11niP(
1SF
)91niP(
0SF
)02niP(
UPCX2
)71niP(
UPC
)81niP(
0 0 0 0
1 1 1 1
0 0
1
1 0 0
1
1
0
1
0
1
0
1
0
1
8
61 06 04 05
66.66
*08
*001
4 8
03 02 52
33.33 *04 *05
Functionality - A V9155C-23
(Using 14.318 MHz input. All frequencies in MHz.)
Functionality - A V9155C-36
(Using 14.318 MHz input. All frequencies in MHz.)
2SF
)11niP(
1SF
)91niP(
0SF
)02niP(
UPCX2
)71niP(
UPC
)81niP(
0 0 0 0
1 1 1 1
0 0
1
1 0 0
1
1
0 1 0 1 0 1 0 1
*57 23 06 04 05
66.66
*08 25
*5.73
61 03 02
52
33.33
*04
62
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