ICS9158-07 Datasheet, PDF (1/6 Pages) Integrated Circuit Systems – Frequency Generator and Integrated Buffer

Integrated
Circuit
Systems, Inc.
ICS9158-07
Frequency Generator and Integrated Buffer
General Description
The ICS9158-07 is a low-cost frequency generator designed
specifically for desktop and notebook PC applications. Four
copies of the CPU clock are available and four copies of
the BUS clock are available, elimating the need for an
external buffer.
Each high drive (25mA) output is capable of driving a 30pF
load and has a typical duty cycle of 50/50. The clock outputs
are skew-controlled to within ±250ps.
The ICS9158-07makes a gradual transition between frequen-
cies, so that it meets the Intel cycle-to-cycle timing specifica-
tion for 486 and Pentium systems.
Features
• 8 skew-free, high drive CPU/BUS clocks
• Reference, floppy and keyboard clocks
• ±250ps skew between all outputs
• Less than ±250ps absolute jitter
• Outputs can drive up to 30pF load at 1.5V/ns
• 50±10% duty cycle
• Compatible with 486 and Pentium CPUs
• On-chip loop filter components
• 3.0V - 5.5V supply range
• 24-pin SOIC package
Applications
Ideal for RISC or CISC systems such as 486, Pentium,™
PowerPC,™ etc., requiring multiple CPU and BUS clocks.
Block Diagram
9158-07 Rev B 053197
Pentium is a trademark of Intel Corporation.
PowerPC is a trademark of Motorola Corporation.
NOTE: THIS DATA SHEET, ICS9158-07, IS AN ADDENDUM TO THE EXISTING
ICS9158 DATA SHEET. ALL INFORMATION IN THIS DATA SHEET SUPERSEDES
THE DATA FOUND IN THE ORIGINAL ICS9158 DATA SHEET.
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