3

Integrated

Circuit

Systems, Inc.

ICS9DB108

0723D—01/08/04

Pin Description (Continued)

PIN #

PIN NAME

PIN TYPE

DESCRIPTION

25

GND

PWR

Ground pin.

26

PD#

IN

Asynchronous active low input pin used to power down the

device. The internal clocks are disabled and the VCO and the

crystal are stopped.

27

SRC_STOP#

IN

Active low input to stop diff outputs.

28

HIGH_BW#

PWR

3.3V input for selecting PLL Band Width

0 = High, 1= Low

29

DIF_4#

OUT

0.7V differential complement clock outputs

30

DIF_4

OUT

0.7V differential true clock outputs

31

VDD

PWR

Power supply, nominal 3.3V

32

GND

PWR

Ground pin.

33

DIF_5#

OUT

0.7V differential complement clock outputs

34

DIF_5

OUT

0.7V differential true clock outputs

35

OE_5

IN

Active high input for enabling outputs.

0 = tri-state outputs, 1= enable outputs

36

OE_6

IN

Active high input for enabling outputs.

0 = tri-state outputs, 1= enable outputs

37

DIF_6#

OUT

0.7V differential complement clock outputs

38

DIF_6

OUT

0.7V differential true clock outputs

39

VDD

PWR

Power supply, nominal 3.3V

40

GND

PWR

Ground pin.

41

DIF_7#

OUT

0.7V differential complement clock outputs

42

DIF_7

OUT

0.7V differential true clock outputs

43

OE_4

IN

Active high input for enabling outputs.

0 = tri-state outputs, 1= enable outputs

44

OE_7

IN

Active high input for enabling outputs.

0 = tri-state outputs, 1= enable outputs

45

LOCK

OUT

3.3V output indicating PLL Lock Status. This pin goes high when

lock is achieved.

46

IREF

IN

This pin establishes the reference current for the differential

current-mode output pairs. This pin requires a fixed precision

resistor tied to ground in order to establish the appropriate

current. 475 ohms is the standard value.

47

GNDA

PWR

Ground pin for the PLL core.

48

VDDA

PWR

3.3V power for the PLL core.