2

Integrated

Circuit

Systems, Inc.

ICS9DB106

Preliminary Product Preview

0833A—07/26/04

Pin Description

PIN

#

PIN NAME

PIN TYPE

DESCRIPTION

1

PLL_BW

IN

3.3V input for selecting PLL Band Width

0 = low, 1= high

2

CLK_INT

IN

"True" reference clock input.

3

CLK_INC

IN

"Complimentary" reference clock input.

4

**CLKREQ1#

IN

Output enable for PCI Express output pair '1'

0 = enabled, 1 = tri-stated

5

PCIEXT0

OUT

True clock of differential PCI_Express pair.

6

PCIEXC0

OUT

Complement clock of differential PCI_Express pair.

7

VDD

PWR

Power supply, nominal 3.3V

8

GND

IN

Ground pin.

9

PCIEXT1

OUT

True clock of differential PCI_Express pair.

10

PCIEXC1

OUT

Complement clock of differential PCI_Express pair.

11

PCIEXT2

OUT

True clock of differential PCI_Express pair.

12

PCIEXC2

OUT

Complement clock of differential PCI_Express pair.

13

VDD

PWR

Power supply, nominal 3.3V

14

SMBDAT

I/O

Data pin of SMBUS circuitry, 5V tolerant

15

SMBCLK

IN

Clock pin of SMBUS circuitry, 5V tolerant

16

VDD

PWR

Power supply, nominal 3.3V

17

PCIEXC3

OUT

Complement clock of differential PCI_Express pair.

18

PCIEXT3

OUT

True clock of differential PCI_Express pair.

19

PCIEXC4

OUT

Complement clock of differential PCI_Express pair.

20

PCIEXT4

OUT

True clock of differential PCI_Express pair.

21

GND

PWR

Ground pin.

22

VDD

PWR

Power supply, nominal 3.3V

23

PCIEXC5

OUT

Complement clock of differential PCI_Express pair.

24

PCIEXT5

OUT

True clock of differential PCI_Express pair.

25

**CLKREQ4#

IN

Output enable for PCI Express output pair '4'

0 = enabled, 1 = tri-stated

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.

Note:

Pins preceeded by '**' have internal 120K ohm pull down resistors