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MK1491-14 Datasheet(PDF) 1 Page - Integrated Circuit Systems

No. de Pieza. MK1491-14
Descripción  OPTi ACPI Firestar Clock Source
Descarga  4 Pages
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Fabricante  ICST [Integrated Circuit Systems]
Página de inicio  http://www.icst.com
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MK1491-14 Datasheet(HTML) 1 Page - Integrated Circuit Systems

   
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MK1491-14
OPTi ACPI Firestar Clock Source
MDS 1491-14 B
1
Revision 061801
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose •CA •95126 • (408)295-9800tel • www.icst.com
Block Diagram
Description
Features
The MK1491-14 is a low cost, low jitter, high
performance clock synthesizer for OPTi’s
Firestar and Firestar+ chipsets for Pentium™
Processor-based mobile computer applications.
Using analog Phase-Locked Loop (PLL)
techniques, the device uses a 14.318 MHz
crystal input to produce multiple output
clocks up to 75 MHz. It provides selectable
Host and PCI local bus clocks as well as
selectable clocks for Super I/O or Universal
Serial Bus (USB). The device has up to seven
Host output clocks.
The chip has three different power down
modes that reduce power on various clocks.
• Packaged in 28 pin, 150 mil wide SSOP
• Provides all critical timing for OPTi ACPI Firestar
and Firestar+
• Early Host clock of 3.5ns
• Separate VDD and skew adjust for Host 5,6, and 7
supports field upgrade to Firestar+ and new 2.5V
processors
• 48MHz USB, 24MHz SIO, and Audio clock support
• Single pin CPU(Host) slowdown to 33.3MHz
• Multiple power down modes
• Low EMI Enable pin reduces EMI radiation (patent
pending)
Crystal
Oscillator
VDD
GND
HOST/PCI
Clocks
STOP#
SEL0
14.31818 MHz
crystal
Output
Buffers
Output
Buffer
Fixed
Clock
Output
Buffers
XI
XO
PS
VDDHOST1-4
SEL1
Host/2
F2
HOST 5, 7
PCI 1:5
SLOW#
Low EMI Enable
Output
Buffer
14.318 MHz
F1
Output
Buffer
FS1:0
Synch./Asynch. PCI
HOST1:4
Output
Buffers
4
2
5
VDDHOST5-7
EHOST6
33M
MUX
HS
3
4


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