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Integrated Circuit Systems - Green PC and Local Bus Clock Source

Numéro de référence MK1434STR
Description Green PC and Local Bus Clock Source
Fabricant Integrated Circuit Systems 
Logo Integrated Circuit Systems 





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MK1434STR fiche technique
MK1432/MK1434
Green PC and Local Bus Clock Source
Description
The MK1432 and MK1434 are low cost, high
performance triple clock synthesizers for green PC and
local bus desktop and notebook applications. Using
analog Phase-Locked Loop (PLL) techniques, the
devices accept a 14.318 MHz crystal input to produce
multiple output clocks up to 100 MHz. They provide
selectable 2XCPU and CPU, selectable local bus clock,
ISA clock, and one fixed peripheral clock. The chips
support PCI and VL buses. The fixed clock is either
24MHz or 40MHz. The devices can operate at 5V or
3.3V up to and including 80MHz on the 2XCPU clock.
The Power Saving pin causes the CPU clocks to
smoothly transition to 33.33 MHz for Pentiums, and
16.67 MHz for 486DX4. In addition, a single pin can be
made to slow DX2s to 8 MHz.
Features
• Packaged in 16 pin narrow (150 mil) SOIC
• Supports all PentiumProcessor timing specs
• Supports synchronous and asynchronous local bus
• Selectable local bus frequencies of 25, 33, or
50MHz
• SCSI or VL bus 40MHz clock on MK1434
• Floppy or super I/O clock on MK1432
• Single Power Saving pin switches to low power
mode (for 486 and Pentium)
• 5V or 3.3V (up to 80MHz) operation
• Smooth transitions for Pentium and 486 based
Green PC
• Low skew (<250ps) Pentium compatible
2X and 1X outputs
• Duty cycle of 45/55 up to 100 MHz
• 25mA output drive capability at TTL levels
• Compatible with all popular microprocessors
• Packaged in 16 pin narrow SOIC
• For Early Clock support, consult MicroClock
Block Diagram
FS0
FS1
FS2
PS
VDD GND
CPU
Clocks
Output
Buffer
÷2 Output
Buffer
2XCPU
CPU
BCLKS
14.318 MHz
crystal
X1
X2
Crystal
Oscillator
Local
Bus
Clock
Fixed
Clock
Output
Buffer
Output
Buffer
Output
Buffer
BCLK
40.00 (MK1434)
or 24.00 MHz
(MK1432)
14.318 MHz
MDS 1432 G
1 Revision 060101
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose • CA • 95126 • (408)295-9800 • www.icst.com

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