Integrated
Circuit
Systems, Inc.
AV9107C-11
Green PC CPU Frequency Generator
General Description
The
AV9107C-11
offers a tiny footprint solution for generating
a fixed system clock and a selectable CPU clock. The 16
selectable CPU frequencies provide all necessary clocks for
386, 486 and Pentium systems.
In addition, the
AV9107C-11
has one pin that, when forced
low, will slow the CPU clock to 8 MHz. This feature is
important in systems that have dynamic microprocessors.
Dynamic microprocessors have a minimum operating speed,
typically 8 MHz. In“green” PCs, the designer often wants to
slow the CPU to its minimum operating speed to save power.
The
AV9107C-11
will smoothly slow the CPU to 8 MHz when
the SLOWCLK pin goes low.
The
AV9107C-11
is fabricated using 0.8m CMOS technology.
As a result, a 45/55 duty cycle can be achieved on the CPU
clock and ±250ps worst case absolute jitter.
Features
•
•
•
•
•
•
•
•
•
One pin slows CPU clock to 8 MHz
Provides system clock and selectable CPU clock
On-chip loop filter
Runs up to 66 MHz at 3.3V
Worst case cycle-to-cycle variation of 0.1%
Smooth transition from one CPU frequency to another
or to 8 MHz
Lowest jitter, ±250ps absolute
16 internal frequencies for 386, 486 or Pentium
systems
Worst case duty cycle of 45/55 on CPU clock
Functionality
FS3
FS2
FS1
FS0
CLK1
14-Pin SOIC
Block Diagram
0
0
0
0
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
39.99 MHz
33.25 MHz
50.11 MHz
30.00 MHz
4.01 MHz
AV 9107-11 RevA052197
PRODUCT REVIEW documents contain information on products in the formative or design
phase of development. Characteristic data and other specifications are design goals. ICS
reserves the right to change or discontinue these products without notice.
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