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PDF AV9155C-01CW20 Data sheet ( Hoja de datos )
| Número de pieza | AV9155C-01CW20 | |
| Descripción | Low Cost 20-Pin Frequency Generator | |
| Fabricantes | Integrated Circuit Systems | |
| Logotipo |  |
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Integrated
Circuit
Systems, Inc.
AV9155C
Low Cost 20-Pin Frequency Generator
General Description
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 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
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:
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
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
DESCRIPTION
Motherboard clock generator with 16 MHz BUS CLK
Motherboard clock generator with 32 MHz BUS CLK
ÔIncludes Pentium frequencies
Features a special 40 MHz SCSI clock
Block Diagram
AV9155C Rev F 12/13/00
Pentium is a trademark of Intel Corporation.
1 page  
AV9155C
Functionality - AV9155C-23
(Using 14.318 MHz input. All frequencies in MHz.)
CLOCK#2 CPU and 2XCPU
FS2
(Pin 11)
FS1
(Pin 19)
FS0
(Pin 20)
000
00 1
0 10
0 11
10 0
10 1
1 10
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
*VDD minimum 3.15V
PERIPHERAL CLOCKS
COMMCLK BUSCLK (Pin
(Pin 1)
6)
1.843
16
FDCLK
(Pin 7)
24
KBCLK
(Pin 8)
12
REFERENCE CLOCKS
REFCLK1
(Pin 13)
14.318
REFCLK2
(Pin 14)
14.318
Functionality - AV9155C-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
FS1
(Pin 19)
0
0
1
1
0
0
1
1
*VDD minimum 3.15V
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 BUSCLK (Pin
(Pin 1)
6)
40 15
FDCLK
(Pin 7)
24
KBCLK
(Pin 8)
12
REFERENCE CLOCKS
REFCLK1
(Pin 13)
14.318
REFCLK2
(Pin 14)
14.318
5
5 Page 
AV9155C Recommended External Circuit
AV9155C
Notes:
1. ICS recommends the use of an isolated ground plane for the AV9155C. All grounds shown on this drawing should be
connected to this ground plane. This ground plane should be connected to the system ground plane at a single point. Please
refer to AV9155C Board Layout Diagram.
2. A single power supply connection for all VDD lines at the 2.2µF decoupling capacitor is recommended to reduce interaction
of analog and digital circuits. The 0.1µF decoupling capacitors should be located as close to each VDD pin as possible.
3. A 33Ω series termination resistor should be used on any clock output which drives more than one load or drives a long trace
(more than about two inches), especially when using high frequencies (>50 MHz). This termination resistor is put in series
with the clock output line close to the clock output. It helps improve jitter performance and reduce EMI by damping standing
waves caused by impedance mismatches in the output clock circuit trace.
4. The ferrite bead does not enhance the performance of the AV9155C, but will reduce EMI radiation from the VDD line.
11
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| PDF Descargar | [ Datasheet AV9155C-01CW20.PDF ] | |
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