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PDF AV9155-01W20 Data sheet ( Hoja de datos )
| Número de pieza | AV9155-01W20 | |
| Descripción | Low Cost 20-Pin Frequency Generator | |
| Fabricantes | Integrated Circuit Systems | |
| Logotipo |  |
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Integrated
Circuit
Systems, Inc.
AV9155
Low Cost 20-Pin Frequency Generator
General Description
The AV9155 is a low cost frequency generator designed spe-
cifically for desktop and notebook PC applications. Its CPU
clocks provide all necessary CPU frequencies for 286, 386 and
486 systems, including support for the latest speeds of proces-
sors. The device uses a 14.318 MHz crystal to generate the
CPU and all peripheral clocks for integrated desktop
motherboards.
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, glitch-free
transitions from one frequency to the next, making this ideal
device to use whenever slowing the CPU speed. The AV9155
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 AV9155. The different devices
are shown below:
Features
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
sinceApril 1990, and is the leader in the area of multiple output
clocks on a single chip. The AV9155 is a third generation
device, and uses ICSs 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
DESCRIPTION
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
9155 Rev B 8/24/98
Pentium is a trademark of Intel Corporation.
1 page  
AV9155
Functionality - AV9155-23
(Using 14.318 MHz input. All frequencies in MHz.)
CLOCK#2 CPU and 2XCPU
FS2 FS1 FS0
(Pin 11) (Pin 19) (Pin 20)
000
001
010
011
100
101
110
111
2XCPU
(Pin 17)
75*
32
60
40
50
66.66
80*
52
CPU
(Pin 18)
37.5*
16
30
20
25
33.33
40*
26
*5V only
PERIPHERAL CLOCKS
COMMCLK
(Pin 1)
BUSCLK
(Pin 6)
1.843
16*
REFERENCE CLOCKS
REFCLK1
(Pin 13)
14.318
FDCLK
(Pin 7)
24
KBCLK
(Pin 8)
12
REFCLK2
(Pin 14)
14.318
Functionality - AV9155-36
(Using 14.318 MHz input. All frequencies in MHz.)
CLOCK#2 CPU and 2XCPU
FS2
(Pin 11)
0
0
0
0
1
1
1
1
*5V only
FS1
(Pin 19)
0
0
1
1
0
0
1
1
FS0
(Pin 20)
0
1
0
1
0
1
0
1
2XCPU
(Pin 17)
8
16
60
40
50
66.66
80*
100*
CPU
(Pin 18)
4
8
30
20
25
33.33
40*
50*
PERIPHERAL CLOCKS
SCSICLK
(Pin 1)
BUSCLK
(Pin 6)
40* 15*
REFERENCE CLOCKS
REFCLK1
(Pin 13)
14.318
FDCLK
(Pin 7)
24*
KBCLK
(Pin 8)
12*
REFCLK2
(Pin 14)
14.318
5
5 Page 
AV9155
LEAD COUNT
DIMENSION L
14L
0.354
16L
0.404
18L
0.454
20L
0.504
24L
0.604
28L
0.704
32L
0.804
Ordering Information
AV9155-01W20, AV9155-02M20,
AV9155-23M20, AV9155-36M20
Example:
ICS XXXX-PPP M X#W
Lead Count & Package Width
Lead Count=1, 2 or 3 digits
W=.3 SOIC or .6 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
11
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| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet AV9155-01W20.PDF ] | |
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