Integrated
Circuit
Systems, Inc.
ICS9159-20
Frequency Generator for SIS551X and SIS6205 Chip Set Systems
General Description
The
ICS9159-20
is a low-cost frequency generator designed
specifically for SIS551X chip set and SIS6205 VGA control-
ler. The integrated buffer minimizes skew. A 14.31818 MHz
XTAL oscillator provides the reference clock to generate
standard Pentium鈩?frequencies. The CPU clock makes grad-
ual frequency transitions without violating the PLL timing
of internal microprocessor clock multipliers.
Both synchronous and asynchronous bus designs are sup-
ported. For chip sets that require an early CPU clock, the
buffers are driven by the CPU clock. In this configuration, the
CPU clock becomes the early clock and the output of the
uncommitted buffers become the bus synchronized bus clocks.
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Features
One selectable CPU clocks operate up to 66.66 MHz
5 uncommitted buffers
Maximum CPU jitter of 鹵200ps
7 BUS clocks support sync or async bus operation
500ps skew window for all synchronous clock edges
Integrated buffer outputs drive up to 30pF loads
3.1V - 3.5V supply range
28-pin 300-mil SOIC package
Supports chip sets requiring early CPU clocking
Applications
Block Diagram
鈥?/div>
Ideal for green Pentium and P6 PCI systems based on the
SIS5596 chip set
Pin Configuration
28-Pin SOIC
Functionality
3.3V鹵10%, 0-70擄C
Crystal (X1, X2) = 14.318181 MHz
FS1
FS0
REF
(MHz)
CPU
(MHz)
BCLK (MHz)
BSEL=1 BSEL=0
0
0
1
1
0
1
0
1
Tistate
14.318
14.318
14.318
Tristate
50
60
66.66
Tristate
25
30
33.33
Tristate
33.33
33.33
33.33
All frequencies in MHz, assuming 14.318 MHz input.
Pentium is a trademark of Intel Corporation.
9159-20 Rev B 040597
ICS reserves the right to make changes in the device data identified in this publication
without further notice. ICS advises its customers to obtain the latest version of all
device data to verify that any information being relied upon by the customer is current
and accurate.
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