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ICS9158-01CM24 Datasheet

  • ICS9158-01CM24

  • CPU System Clock Generator

  • 7頁

  • ETC

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Integrated
Circuit
Systems, Inc.
ICS9158-01
Integrated Buffer and Motherboard Frequency Generator
General Description
The
ICS9158-01
is a low cost frequency generator designed
specifically for desktop and notebook PC applications. Eight
high drive, skew-controlled copies of the CPU clock are
avail-able, eliminating the need for an external buffer.
Each high drive (50mA) output is capable of driving a 30pf
load and has a typical duty cycle of 50/50. The CPU clock
outputs are skew-controlled to within 鹵250ps. The CPU
clocks provide all necessary frequencies for 286, 386, 486
and Pentium systems, including support for the latest speeds
of processors.
The CPU clock offers the unique feature of smooth, glitch-
free transitions from one frequency to the next, making this
the ideal device to use whenever slowing the CPU speeds. The
ICS9158-01
makes a gradual transition between frequencies
so that it meets the Intel cycle-to-cycle timing specification
for 486 systems.
Features
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Eight skew-free, high drive CPU clock outputs
Up to 100 MHz output at 5V
鹵250ps skew between CPU and 2XCPU outputs
Outputs can drive up to 30pf load
50mA output drivers
Typical 50/50 duty cycle
Compatible with 486 and Pentium CPUs
Glitch-free start and stop clock option
Optional power-down mode supports Energy Star
(鈥済reen鈥? PCs
On-chip loop filter components
Low power, high speed 0.8碌CMOS technology
24-pin PDIP or SOIC package
Functionality
Clock
BUSCLK
FDCLK
14.318
CPUCLK
2XCPUCLK
ICS9158-01 (MHz)
16
24
14.318
4,8,30,20,25,33.3,40, or 50
8,16,60,40,50,66.6,80, or 100
Block Diagram
9158-01 Rev B 05/30/97
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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