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STM1E-SFPxx 155Mbps Copper Transceiver
Final Datasheet
Host Interface Pinout
Pin
1
2
3
Name
VeeT
Tx Fault
Tx Disable
Description
Transmitter ground.
Not supported in STM1E-SFPxx. Grounded internally.
Transmit Disable. When pin is high or open, the transmitter is powered
Notes
Note 1
down and tri-stated.
4
5
6
7
MOD-DEF2
MOD-DEF1
MOD-DEF0
Rate Select
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.
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.
Module Definition 0. Grounded internally. Used to notify host system
that an SFP is present.
Not supported in STM1E-SFPxx. Floating internally.
8
RLOS
Receive Loss of Signal. Asserted when the received signal is less than
Note 2
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.
9 VeeR Receiver ground. Note 1
10 VeeR Receiver ground. Note 1
11 VeeR Receiver ground. Note 1
12 RD-
13 RD+
Recovered receive NRZ data output (inverted).
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+
19 TD-
Transmit NRZ data input.
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.
STM1E-SFPxx Datasheet
-5-
August 2008 v2-2
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