ICST GSP9108-10CS8, GSP9108-10CS14, GSP9108-10CN8, GSP9108-10CN14, GSP9108-05CS8 Datasheet
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Integrated
Circuit
Systems, Inc.
AV9108
CPU Frequency Generator
Block Diagram
AV 9108 RevB032195
General Description
The AV9108 offers a tiny footprint solution for generating two
simultaneous clocks. One clock, the REFCLK, is a fixed output
frequency which is the same as the input reference crystal (or
clock). The other clock, CLK1, can vary between 2 and 120
MHz, with up to 16 selectable preprogrammed frequencies
stored in internal ROM.
The ICS9108 is ideal for use in a 3.3V system. It can generate
a 66.66 MHz clock at 3.3V. In addition, the ICS9108 provides
a symmetrical wave form with a worst case duty cycle of 45/55.
The ICS9108 has very tight edge control between the CPU
clock and 2XCPU clock outputs, with a worst case skew of
250ps.
The device has advanced features which include on-chip loop
filters, tristate outputs, and power-down capability. A minimum of external components - two decoupling capacitors and
an optional ferrite bead - are all that are required for jitter-free
operation. Standard versions for computer motherboard applications are the AV9108-03, AV9108-05 and the ICS9108-10.
Custom masked versions, with customized frequencies and
features, are available in 6-8 weeks for a small NRE fee.
Features
•• Runs up to 80 MHz at 3.3V
•• 50/50 typical duty cycle at 5V
••±250ps absolute jitter
•• Generates frequencies from 2 to 140 MHz
•• 2 to 32 MHz input reference frequency
•• Up to 16 frequencies stored internally
•• Patented on-chip Phase Locked Loop with VCO for clock
generation
•• Provides reference clock and synthesized clock
•• On-chip loop filter
•• Low power 0.8µ CMOS technology
•• 8-pin or 14-pin DIP or SOIC package
Pin Configuration
Pin Descriptions for
AV9108-03, AV9108-05 and AV9108-10
PIN NUMBER PIN
NAME TYPE DESCRIPTION
-05/-10/-13 -03
1 14 FS0 Input Frequency Select 0 for CLK1 (-03 has pull-up).
5 1 FS1 Input Frequency Select 1 for CLK1 (-03 has pull-up).
2 FS2 Input Frequency Select 2 for CLK1 (-03 has pull-up).
3 FS3 Input Frequency Select 3 for CLK1 (-03 has pull-up).
4 AGND - Analog GROUND.
2 5 GMD - Digital GROUND.
6
PD Input POWER-DOWN. Shuts off chip when low. Internal pull-up.
3 7 X1/ICLK Input CRYSTAL OUTPUT or INPUT CLOCK frequency. Typically 14.318 MHz
system clock.
4 8 X2 Output CRYSTAL OUTPUT (No Connect when clock used.).
9 OE(REFCLK) Input OUTPUT ENABLE. Tristates REFCLK when low. Pull-up.
10 OE(CLK1) Input OUTPUT ENABLE. Tristates CLK1 when low. Pull-up.
6 11 CLK1 Output CLOCK1 Output (see decoding tables).
7 12 VDD - Digital power supply (+3V DC).
8 13 REFCLK Output REFERENCE CLOCK output. Produces a buffered version of the input clock or
crystal frequency (typically 14.318 MHz).
FS0 1 8 REFCLK
GND 2 7 VDD
X1/ICLK 3 6 CLK1
X2 4 5 FS1
AV9108-05/-10
8-Pin DIP, SOIC
FS1 1 14 FS0
FS2 2 13 REFCLK
FS3 3 12 VDD
AGND 4 11 CLK1
GND 5 10 OE (CLK1)
PD 6 9 OE (REFCLK)
X1/ICLK 7 8 X2
AV9108-03/-11
14-Pin DIP, SOIC
AV9108
2
Actual Frequencies
Decoding Table for AV9108-05, 14.318 input
FS1 FS0 CLK1
0
0
1
1
0
1
0
1
40.01 MHz
50.11 MHz
66.61 MHz
80.01 MHz
Decoding Table for AV9108-03, 14.318 input
FS3 FS2 FS1 FS0 CLK1
0
0
0
1
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
16.00 MHz
39.99 MHz
50.11 MHz
80.01 MHz
66.58 MHz
100.23 MHz
8.02 MHz
4.01 MHz
8.02 MHz
20.00 MHz
25.06 MHz
40.01 MHz
33.29 MHz
50.11 MHz
4.01 MHz
2.05 MHz
Decoding Table for AV9108-10, 14.318 input
FS1 FS0 CLK1
0
0
1
1
0
1
0
1
25.057 MHz
33.289 MHz
40.006 MHz
50.113 MHz
Decoding Table for AV9108-11 (in MHz)
FS3 FS2 FS1 FS0 CLK1
0
0
0
1
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
16.00 MHz
33.39 MHz
50.11 MHz
80.01 MHz
66.58 MHz
100.23 MHz
60.00 MHz
4.01 MHz
8.02 MHz
20.05 MHz
25.06 MHz
39.99 MHz
33.25 MHz
50.11 MHz
30.00 MHz
4.01 MHz
Note: The dash number following ICS9108 must be included when ordering product since it specifies the frequ ency decoding
table being ordered. Decoding options can be created by a simple metal mask change.
AV9108
3
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