MK149106 Datasheet, PDF (1/10 Pages) Integrated Circuit Systems – AMD Geode™ 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.
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 [phone] ● www.icst.com