ICS9248-80 Datasheet, PDF (1/7 Pages) Integrated Circuit Systems – General Purpose 133MHz System Clock

Integrated
Circuit
Systems, Inc.
ICS9248 - 80
General Purpose 133MHz System Clock
General Description
The ICS9248-80 is a general purpose system clock. It
provides 8 output CLKs, 1 REF CLK and excellent power
management features through CLK_STOP#.
Spread spectrum may be enabled through I²C programming.
Spread spectrum typically reduces EMI by 8dB to 10 dB.
This simplifies EMI qualification without resorting to board
design iterations or costly shielding. The ICS9248-80
employs a proprietary closed loop design, which tightly
controls the percentage of spreading over process and
temperature variations.
Features
• Extended temperature range (-20°C to +70°C)
• Output features:
- 8 CLK outputs @ 3.3V, up to 133.34MHz.
- 1-REF output @ 3.3V, 14.31818MHz.
• Spread Spectrum for EMI control
• I²C interface to stop clocks, select spread and frequency.
• Excellent power managment feature through CLK_STOP#
and individual stop clocks through I²C.
• Input is from a 14.31818MHz crystal.
Block Diagram
Pin Configuration
9248-80 Rev A 3/21/00
28-Pin 209 mil SSOP
* These inputs have a 120K internal pull-up to 3.3V.
** These inputs have a 120K internal pull-down to GND.
Pentium II is a trademark of Intel Corporation
I²C is a trademark of Philips Corporation
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.