Philips Semiconductors

Product data

PCK2021

CK00 (100/133 MHz) spread spectrum

differential system clock generator

2

2001 Oct 11

853-2301 27233

FEATURES

DESCRIPTION

The PCK2021 is a clock synthesizer/driver for a Pentium III

™ and

other similar processors.

The PCK2021 has six differential pair CPU current source outputs,

two 33 MHz outputs, one 3V66 output, and two 48 MHz clocks

which can be disabled on power-up, and one 3.3 V reference clock

at 14.318 MHz which can also be disabled on power-up.

The part possesses a dedicated power-down input pin for power

management control. This input is synchronized on chip, and

ensures glitch-free output transitions. In addition, the part can be

configured to disable the 48 MHz outputs for lower power operation

and an increase in the performance of the functioning outputs. The

REF and PCI outputs can also be disabled for the highest

performance of the Host outputs.

PIN CONFIGURATION

1

2

3

4

5

6

7

8

9

10

11

12

37

38

39

40

41

42

43

44

45

46

47

48

48M_0/SELA

48M_1/SELB

3V66

HCLK0

HCLKB0

PCI0

PCI1

SEL133/100

NC

PWRDWN

HCLK3

HCLKB3

13

14

15

16

17

18

31

32

33

34

35

36

HCLK1

HCLKB1

HCLK2

HCLKB2

HCLK4

HCLKB4

HCLK5

HCLKB5

19

30

REF

20

21

22

23

24

25

26

27

28

29

SPREAD

XIN

XOUT

MULTSEL0

MULTSEL1

SW00960

ORDERING INFORMATION

PACKAGES

TEMPERATURE RANGE

ORDER CODE

DRAWING NUMBER

48-Pin Plastic TSSOP

0 to +70

°C

PCK2021DGG

SOT362-1

48-Pin Plastic SSOP

0 to +70

°C

PCK2021DL

SOT370-1

Intel and Pentium III are trademarks of Intel Corporation.