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PI6C133-03V

133 MHz Clock Generation for Pentium II/III Processors

Pericom Semiconductor 

PI6C133-03

133 MHz Clock Generation

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Pin Description

Pin

Symbol

2,3

REF [0:1]

5

XTAL_IN

6

XTAL_OUT

8

PCICLK_F

9,11,12,14,15,17,18 PCICLK[1-7]

21,22

3V66 [0-1]

28

SEL133/100#

30

48MHz

I/O

Functional Description

O 3.3V 14.318 MHz clock output

I 14.318 MHz Crystal input

O 14.318 MHz Crystal output

O 3.3V Free Running PCI clock

O 3.3V PCI Clock Outputs

O 3.3V Fixed 66 MHz Clock Outputs

I

3.3 LVTTL compatible input for 133 MHz or 100 MHz CPU Outputs.

H = 133 MHz L = 100 MHz

O 3.3V Fixed 48 MHz Clock output

32,33

SEL[0-1]

I 3.3 LVTTL compatible input for logic selection function

34

SPREAD#

I 3.3 LVTTL compatible input. Enables spread spectrum mode when held LOW

35

PWRDWN# I 3.3 LVTTL compatible input. Device Enters Powerdown mode when held LOW

36

CPUSTOP#

I

3.3 LVTTL compatible input. Stops all CPUCLK and 3V66 clocks

when held LOW.

37

PCISTOP#

I

3.3 LVTTL compatible input. Stops all PCI clocks except PCICLK_F

when held LOW.

41,42,45,46

CPUCLK[0-3]

O

2.5V Host Bus Clock output. 133 MHz or 100 MHz depending on state of

SEL133/100#.

53,54,55

APIC[0-2]

2.5V Clock outputs running divide synchonous with the CPU

O

(Host bus) clock frequency. Fixed 16.67 MHz limit.

If CPU = 133 MHz, APIC = CPU/8

If CPU = 100 MHz, APIC = CPU/6

4,10,16,23,27,31,39

VDD3V

3.3V

Power

3.3V power supply

1,7,13,19,20,24,29

38,40,44,48,52

VSS

VSS Ground

43,47,51,56

VDD2V

2.5V

Power

2.5V power

25,26,49,50

NC

Unused

351

PS8415

07/23/99

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