STM1E-SFPxx 155Mbps Copper Transceiver

Final Datasheet

STM1E-SFPxx Datasheet

- 5 -

August 2008 v2-2

Host Interface Pinout

Pin

Name

Description

Notes

1

VeeT

Transmitter ground.

Note 1

2

Tx Fault

Not supported in STM1E-SFPxx. Grounded internally.

3

Tx Disable

Transmit Disable. When pin is high or open, the transmitter is powered

down and tri-stated.

4

MOD-DEF2

Module Definition 2. Bi-directional data pin of two wire serial ID

interface. This pin is open-drain and may be wired-ORed with other

open-drain or open-collector devices.

5

MOD-DEF1

Module Definition 1. Clock pin of two wire serial ID interface. Data is

clocked into EEPROM device on the positive edge and clocked out on

the negative edge.

6

MOD-DEF0

Module Definition 0. Grounded internally. Used to notify host system

that an SFP is present.

7

Rate Select

Not supported in STM1E-SFPxx. Floating internally.

8

RLOS

Receive Loss of Signal. Asserted when the received signal is less than

approximately 19dB below nominal for 110 UI. The RLOS condition is

cleared when the received signal is greater than approximately 18dB

below nominal for 110 UI.

Note 2

9

VeeR

Receiver ground.

Note 1

10

VeeR

Receiver ground.

Note 1

11

VeeR

Receiver ground.

Note 1

12

RD-

Recovered receive NRZ data output (inverted).

13

RD+

Recovered receive NRZ data output.

14

VeeR

Receiver ground.

Note 1

15

VccR

Receiver power supply (+3.3V).

Note 3

16

VccT

Transmitter power supply (+3.3V).

Note 3

17

VeeT

Transmitter ground.

Note 1

18

TD+

Transmit NRZ data input.

19

TD-

Transmit NRZ data input (inverted).

20

VeeT

Transmitter ground.

Note 1

Notes:

1. Transmit and Receive grounds are connected directly together internally. For STM1E-SFP08 version,

circuit grounds are also connected to frame/chassis ground.

2. During Rx LOS conditions, the receive data outputs RD+/- are squelched. See Receiver Loss of Signal

Condition section for more information on LOS detection for STM-1e interfaces.

3. Transmit and Receive power supplies are connected together internally.