MK1491-06RTR Просмотр технического описания (PDF) - Integrated Circuit Systems

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MK1491-06RTR

AMD Geode™ Clock Source

Integrated Circuit Systems 

MK1491-06

AMD Geode™ Clock Source

Description

The MK1491-06 is a low-cost, low-jitter,

high-performance clock synthesizer for AMD’s

Geode-based computer and portable appliance

applications. Using patented analog Phased-Locked

Loop (PLL) techniques, the device accepts a 14.318

MHz crystal input to produce multiple output clocks. It

provides selectable PCI local bus and AC97 audio

clocks, 24 MHz and 48 MHz clocks for Super I/O and

USB, as well as multiple Reference outputs.

The device has multiple power-down modes to reduce

power consumption.

Block Diagram

Features

• Packaged in 28-pin SOIC or in 28-pin SSOP

• Available in Pb (lead) free

• Provides all critical timing for the AMD Geode

companion chip

• Four PCI clocks

• Selectable PCIF on up to 2 outputs

• Early PCI clock selectability

• Up to 4 Reference clocks

• 48 MHz USB and 24MHz SIO support

• AC97 audio clock

• Multiple power down modes

• Low EMI Enable pin reduces EMI radiation on PCI

clocks (patented)

• Operating voltage of 3.3 V ±5%

VDD

6

GND

5

PCI Frequency Select

Low EMI Enable

PCIF Function Enable

Early PCI Enable

SLOW#

PCISTP#

PWRDWN#

2

PCI

Clocks

3

PCI

EPCI/PCI

Audio Select

14.3M/24M Select

XI

14.31818 MHz

crystal

XO

Crystal

Oscillator

Audio

Clock

Fixed

Clocks

MUX

16.394 MHz or

24.576 MHz or

49.152 MHz

48 MHz

14.318 MHz or

24 MHz

3 14.318 MHz

MDS 1491-06 J

1

Revision 110204

Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com

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