2

Integrated

Circuit

Systems, Inc.

ICS9DB104

0767C—07/19/04

Pin Description

PIN #

PIN NAME

PIN TYPE

DESCRIPTION

1

VDD

PWR

Power supply, nominal 3.3V

2

SRC_IN

IN

0.7 V Differential SRC TRUE input

3

SRC_IN#

IN

0.7 V Differential SRC COMPLEMENTARY input

4

GND

PWR

Ground pin.

5

VDD

PWR

Power supply, nominal 3.3V

6

DIF_1

OUT

0.7V differential true clock outputs

7

DIF_1#

OUT

0.7V differential complement clock outputs

8

OE_1

IN

Active high input for enabling outputs.

0 = tri-state outputs, 1= enable outputs

9

DIF_2

OUT

0.7V differential true clock outputs

10

DIF_2#

OUT

0.7V differential complement clock outputs

11

VDD

PWR

Power supply, nominal 3.3V

12

BYPASS#/PLL

IN

Input to select Bypass(fan-out) or PLL (ZDB) mode

0 = Bypass mode, 1= PLL mode

13

SCLK

IN

Clock pin of SMBus circuitry, 5V tolerant.

14

SDATA

I/O

Data pin for SMBus circuitry, 5V tolerant.

15

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.

16

SRC_STOP#

IN

Active low input to stop diff outputs.

17

HIGH_BW#

IN

3.3V input for selecting PLL Band Width

0 = High, 1= Low

18

VDD

PWR

Power supply, nominal 3.3V

19

DIF_5#

OUT

0.7V differential complement clock outputs

20

DIF_5

OUT

0.7V differential true clock outputs

21

OE_6

IN

Active high input for enabling outputs.

0 = tri-state outputs, 1= enable outputs

22

DIF_6#

OUT

0.7V differential complement clock outputs

23

DIF_6

OUT

0.7V differential true clock outputs

24

VDD

PWR

Power supply, nominal 3.3V

25

GND

PWR

Ground pin.

26

IREF

OUT

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.

27

GNDA

PWR

Ground pin for the PLL core.

28

VDDA

PWR

3.3V power for the PLL core.