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MK1491-06RLFTR

Description
AMD Geode⑩ Clock Source
File Size148KB,10 Pages
ManufacturerICS ( IDT )
Websitehttp://www.icst.com
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MK1491-06RLFTR Overview

AMD Geode⑩ Clock Source

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.
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%
Block Diagram
VDD
6
GND
5
PCI Frequency Select
Low EMI Enable
PCIF Function Enable
Early PCI Enable
SLOW#
PCISTP#
PWRDWN#
Audio Select
2
3
PCI
Clocks
PCI
EPCI/PCI
Audio
Clock
Fixed
Clocks
16.394 MHz or
24.576 MHz or
49.152 MHz
48 MHz
MUX
14.318 MHz or
24 MHz
3
14.3M/24M Select
XI
14.31818 MHz
crystal
Crystal
Oscillator
14.318 MHz
XO
MDS 1491-06 J
Integrated Circuit Systems, Inc.
1
525 Race Street, San Jose, CA 95126
Revision 110204
tel (408) 297-1201
www.icst.com

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