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.
