mk1432 ETC-unknow, mk1432 Datasheet

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mk1432

Manufacturer Part Number
mk1432
Description
Green Local Clock Source
Manufacturer
ETC-unknow
Datasheet

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Company
Part Number
Manufacturer
Quantity
Price
Part Number:
mk14322N
Manufacturer:
PHI
Quantity:
6 228
Part Number:
mk1432S
Manufacturer:
MICROCLOCK
Quantity:
20 000
Block Diagram
MDS 1432 G
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose • CA • 95126 • (408)295-9800 • www.icst.com
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.
14.318 MHz
crystal
Description
BCLKS
FS0
FS2
FS1
PS
X1
X2
Oscillator
VDD
Crystal
GND
Green PC and Local Bus Clock Source
Clocks
Fixed
Clock
Local
Clock
CPU
Bus
1
• Packaged in 16 pin narrow (150 mil) SOIC
• Supports all Pentium™ Processor timing specs
• Supports synchronous and asynchronous local bus
• Selectable local bus frequencies of 25, 33, or
• SCSI or VL bus 40MHz clock on MK1434
• Floppy or super I/O clock on MK1432
• Single Power Saving pin switches to low power
• 5V or 3.3V (up to 80MHz) operation
• Smooth transitions for Pentium and 486 based
• Low skew (<250ps) Pentium compatible
• 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
Features
50MHz
Green PC
2X and 1X outputs
mode (for 486 and Pentium)
÷2
Output
Output
Output
Output
Output
Buffer
Buffer
Buffer
Buffer
Buffer
MK1432/MK1434
BCLK
40.00 (MK1434)
or 24.00 MHz
(MK1432)
2XCPU
14.318 MHz
CPU
Revision 060101

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mk1432 Summary of contents

Page 1

... 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 ...

Page 2

... Connect to +5V or 3.3V. Must be same voltage as pin 13. P Connect to ground. O Local Bus Clock output. See table above. O 24.00 MHz clock output (MK1432 only). O 40.00 MHz clock output (MK1434 only). I Power Saving pin. Smoothly changes CPU to/from 33.33 and 16.67 MHz. IPU. TI Local Bus Clock Select pin. See table above. ...

Page 3

... External Components The MK1432/4 requires a minimum number of external components for proper operation. Decoupling capacitors of 0.1µF should be connected between VDD and GND, as close to the MK1432/4 as possible. A series termination resistor of 33 may be used for each clock output. The device does not require (nor do we recommend) capacitors connected to the crystal pins ...

Page 4

... Integrated Circuit Systems, Inc. • 525 Race Street • San Jose • CA • 95126 • (408)295-9800 • www.icst.com Green PC and Local Bus Clock Source 45° c Fixed Output Clock Frequency 24 MHz 40 MHz - - 4 MK1432/MK1434 16 pin SOIC narrow Inches Inches Symbol Min Max A 0.055 0.070 1.397 b 0.013 0.019 0.330 c ...

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