Integrated
Circuit
Systems, Inc.
ICS9169C-40
System Clock Chip
General Description
The
ICS9169C-40
is a Clock Synthesizer chip for Pentium or
Cyrix CPU based motherboards using PCI.
Features include eight CPU clocks and six PCI clocks. A
Reference Output is available equal to the crystal frequency.
The device meets the Pentium power-up stabilization, which
requires that CPU and PCI clocks be stable within 2ms after
power-up.
The
ICS9169C-40
clock output are designed for low EMI
emissions. Controlled rise and fall times, unique output
driver circuits and innovative circuit layout techniques enable
the
ICS9169C-40
to have lower EMI than other clock
devices.
The
ICS9169C-40
accepts a 14.318MHz reference crystal or
clock as its input and runs from a 3.3V supply.
Features
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8 selectable CPU clocks up to 75MHz
Six synchronous PCI clocks
One Referance Clock at 14.318MHz
Power-up stabilization time = 2ms on all CPU and PCI
clocks, which meets Intel PentiumPro power-up
Low CPU and PCI clock jitter <500ps
Low skew output
Improved output drivers are designed for low EMI
Test Mode
Optional common or mixed supply mode:
(VDD = VDDL1 =VDDL2 = 3.3V)
(VDD = 3.3V, VDDL1=VDDL2 = 2.5)
(VDD = 3.3V, VDDL1 = 3.3V, VDDL2 = 2.5V)
Space saving and low cost 34-pin SSOP package
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Block Diagram
Pin Configuration
34-Pin SSOP
FS2
0
0
0
FS1
0
0
1
1
0
0
1
1
FS0
0
1
0
1
0
1
0
1
CPU
50MHz
55MHz
REF/2
75MHz
50MHz
55MHz
60MHz
66.6MHz
PCI
33.3MHz
36.67MHz
REF/4
37.5MHz
25MHz
27.6MHz
30MHz
33.3MHz
Functionality
3.3V鹵10%, 0-70
擄
C
Crystal (X1, X2) = 14.31818 MHz
Pentium is a trademark on Intel Corporation.
9169C-40RevA072897P
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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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