ICS9248F-80-T Просмотр технического описания (PDF) - Integrated Circuit Systems

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ICS9248F-80-T

General Purpose 133MHz System Clock

Integrated Circuit Systems 

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.

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