PCK857 datasheet(2/8 Pages) PHILIPS

Part #	PCK857

Description	66-150MHz Phase Locked Loop Differential 1:10 SDRAM Clock Driver

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Manufacturer	PHILIPS [NXP Semiconductors]

Direct Link	http://www.nxp.com

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Philips Semiconductors

Preliminary specification

PCK857

66–150MHz Phase Locked Loop Differential 1:10

SDRAM Clock Driver

2

1998 Dec 10

FEATURES

• Optimized for clock distribution in DDR (Double Data Rate)

SDRAM applications

• 1-to-10 differential clock distribution

• Very low skew (< 100ps) and jitter (< 100ps)

• 3V AV

CC and 2.5V Vddq

• SSTL_2 interface clock inputs and outputs

• CMOS control signal input

• Test mode enables buffers while disabling PLL

• Low current power-down mode

• Tolerant of Spread Spectrum input clock

• Full DDR solution provided when used with SSTL16857 and

CBT3857

DESCRIPTION

Zero delay buffer to distribute an SSTL differential clock input pair to

10 SSTL_2 differential output pairs. Outputs are slope controlled.

External feedback pin for synchronization of the outputs to the input.

A CMOS style Enable/Disable pin is provided for low power disable.

PIN CONFIGURATION

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

21

22

23

24

41

42

43

44

45

46

47

48

GND

Y0

VDDQ

Y1

GND

Y2

GND

Y2

VDDQ

CLK

VDDQ

AVCC

AGND

GND

Y3

VDDQ

Y4

GND

Y5

VDDQ

Y6

GND

Y7

VDDQ

G

FBIN

VDDQ

FBOUT

GND

Y8

VDDQ

Y9

SW00358

GND

ORDERING INFORMATION

PACKAGES

TEMPERATURE RANGE

OUTSIDE NORTH AMERICA

NORTH AMERICA

DRAWING NUMBER

48-Pin Plastic TSSOP

0

°C to +70°C

PCK857 DGG

SOT362-1

PINS

SYMBOL

DESCRIPTION

1, 7, 8, 18, 24, 25, 31, 41, 42, 48

GND

SSTL_2 ground pins

2, 3, 5, 6, 9, 10, 19, 20, 22, 23, 26, 27, 29,

30, 32, 33, 39, 40, 43, 44, 46, 47

Yn, Ynb, FBOUT, FBOUTb

SSTL_2 differential outputs

4, 11, 12, 15, 21, 28, 34

VDDQ

SSTL_2 power pins

13, 14, 35, 36

CLKIN, CLKINb, FBIN, FBINb

SSTL_2 differential inputs

16

AVCC

Analog power

17

AGND

Analog ground

37

G

Power-down control input

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