ICS9169C-26 データシートの表示（PDF） - Integrated Circuit Systems
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ICS9169C-26 Datasheet PDF : 5 Pages
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Integrated
Circuit
Systems, Inc.
ICS9169C-26
Preliminary Product Preview
Frequency Generator and Integrated Buffers
General Description
The ICS9169C-26 is a low-cost frequency generator
designe specifically for Pentium-based chip set systems.
The integrated buffer minimizes skew and provides all the
clocks required. A 14.318 MHz XTAL oscillator provides
the reference clock to generate standard Pentium
frequencies. The CPU clock makes gradual frequency
transitions without violating the PLL timing of internal
microprocessor clock multipliers.
Either synchronous (CPU/2) or asynchronous (32 MHz)
PCI bus operation can be selected.
Features
Twelve selectable CPU clocks operate up to 83.3 MHZ
Eight selectable CPU clocks operate up to100 MHz
Maximum CPU jitter of ±200ps
Seven BUS clocks support sync or async bus operation
500ps skew window for all synchronous clock edges
CPU clocks to BUS clocks in sync mode skew
1-4ns (CPU early)
Integrated buffer outputs drive up to 30pF loads
3.0V - 3.7V supply range
36-pin SSOP package
48 MHz clock for USB support and 24 MHz clock for FD
Block Diagram
Pin Configuration
Functionality
3.3V±10%, 0-70°C
Crystal (X1, X2) = 14.31818 MHz
9169C-26RevB091997P
36-Pin SSOP
BSEL FS2
0
0
FS1 FS0
0
0
CPU
(1:8)
MHz
55
BUS
(0:7)
MHz
27.5
48 MHz 24 MHz
REF
(1:3)
48
24 14.318
0
0
0
1
80
40
48
24 14.318
0
0
1
0
100
50
48
24 14.318
0
0
1
1
75 37.5 48
24 14.318
0
1
0
0
50
25
48
24 14.318
0
1
0
1 66.6 33.3 48
24 14.318
0
1
1
0
60 30.0 48
24 14.318
0
1
1
1 Tristate Tristate Tristate Tristate Tristate
1 select select select Tristate 32.0 48
24 14.318
Pentium is a trademark on Intel Corporation.
PRODUCT PREVIEW documents contain information on new
products in the sampling or preproduction phase of development.
Characteristic data and other specifications are subject to change
without notice.
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