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VSC7173

Data Sheet

Revision 4.1

May 23, 2005

Confidential

Pin Identifications

Table 13. Pin Identifications

Pin Number

Signal

Type

Level

Description

7, 6

15, 14

31, 30

P0OUTP, P0OUTN

P1OUTP, P1OUTN

P2OUTP, P2OUTN

O

High-

Speed

These are the high-speed differential outputs for port 0, port 1,

and port 2. These outputs must be AC-coupled.

3, 4

11, 12

27, 28

P0INP, P0INN

P1INP, P1INN

P2INP, P2INN

I

High-

Speed

These are the high-speed differential inputs for port 0, port 1, and

port 2. These inputs must be AC-coupled.

19

18

PORTSEL0

PORTSEL1

I

LVTTL

These two inputs select the active port (port 0 or port 1). For more

information on the modes of operation, see Table 1 on page 4.

2

10

26

HIV0

HIV1

HIV2

I

LVTTL

When HIGH, these inputs select the high voltage swing output

mode for the corresponding output buffer and enable pre-

emphasis. See Table 4 on page 6.

24

23

OOBSEL0

OOBSEL1

I

LVTTL

These two inputs control the OOB detector threshold voltage for

all three input ports. See Table 5 on page 7 for threshold levels.

1

P0SLTD

O

LVTTL

This output reports which port is selected or OOB status of port 1,

depending on the value of MODE1. See Table 2 on page 4.

9

OOBPORT0

O

LVTTL

When HIGH, this output indicates that the input signal for port 0 is

below the OOB threshold. When LOW, the input signal for port 0

is above the OOB threshold.

17

MODE0

I

LVTTL

This input is used to select the operating mode for the VSC7173

as described in Table 1 on page 4.

21

MODE1

I

LVTTL

This input is used to select the operating mode for the VSC7173

as described in Table 1 on page 4.

20

VDD

Power

3.3 V power supply for all circuits except the high-speed output

buffers.

8, 16

32

VDD0, VDD1

VDD2

Power

3.3 V output buffer power supply for P0OUTP/N, P1OUTP/N, and

P2OUTP/N, respectively.

25

Reserved

Reserved for future use. Leave unconnected.

5, 13,

22, 29

DAP

VSS

GND

Common ground.

DAP is the exposed die attach pad on the bottom of the device.