Datasheet Transceiver

Pin Descriptions

PinSignal Name

Description

Notes

1VeeT

Module Transmitter Ground

1

2

Tx_Fault

Transmitter Fault. Not supported, Grounded in module

2

3

Tx_Disable

Transmitter Disable - Module disables on high or open

3

4

MOD_DEF(2)

Module Definition 2. Data line for Serial ID.

5

MOD_DEF(1)

Module Definition 1. Clock line for Serial ID.

6

MOD_DEF(0)

Module Absent, connected to VeeT or VeeR in the module

7

Rate Select

No connection

8

Rx_LOS

Loss of Signal - High Indicates Loss of Signal

2

9VeeR

Module Receiver Ground

1

10

VeeR

Module Receiver Ground

1

11

VeeR

Module Receiver Ground

1

12

RD-

Receiver Inverted Data Output

5

13

RD+

Receiver Non-Inverted Data Output

5

14

VeeR

Module Receiver Ground

1

15

VccR

Module Receiver 3.3 V Supply

4

16

VccT

Module Transmitter 3.3 V Supply

4

17

VeeT

Module Transmitter Ground

1

18

TD+

Transmitter Non-Inverted Data Input

6

19

TD-

Transmitter Inverted Data Input

6

20

VeeT

Module Transmitter Ground

1

Notes:

1.

The module signal ground contacts, VeeR and VeeT, should be isolated from the module case.

2.

TX Fault is not used and is always tied to ground.

3

TX Disable as described in the MSA is not applicable to the 1000BASE-T module, but is used for convenience as an input to reset the internal ASIC.

This pin is pulled up within the module with a 4.7kΩ to 10kΩ resistor.

Low (0–0.8 V): Transceiver on

Between (0.8 V and 2.0 V): Undefined

High (2.0–3.465 V): Transceiver in reset disable state

Open: Transceiver in reset disable state

4.

VCCR and VCCT are the receiver and transmitter power supplies. They are defined as 3.3 V ± 5% at the SFP connector pin. The maximum supply

current is about 300mA and the associated in-rush current will typically be no more than 30 mA above steady state aſter 500 nanoseconds.

5.

RD-/+: These are the differential receiver outputs. They are ac coupled 100 ohm differential lines which should be terminated with 100 ohm differential

at the user SERDES. The ac coupling is done inside the module and is thus not required on the host board. The voltage swing on these lines will be

between 600 and 2000 mV differential when properly terminated. These levels are compatible with CML and LVPECL voltage swings.

6.

TD-/+: These are the differential transmitter inputs. They are ac coupled differential lines with 100 ohm differential termination inside the module. The

ac coupling is done inside the module and is thus not required on the host board. The inputs will accept differential swings of 500 – 2400 mV, though

it is recommended that values between 500 and 1200 mV differential (250 – 600 mV single ended) be used for best EMI performance. These levels are

compatible with CML and LVPECL voltage swings.