Table 2. Pin Description
Pin
1
Name
Function/Description
Notes
VeeT
Transmitter Ground
2
TX_FAULT
TX_DISABLE
MOD-DEF2
MOD-DEF1
MOD-DEF0
N.C.
Transmitter Fault Indication – High indicates a fault condition
Transmitter Disable – Module electrical input disables on high or open
Module Definition 2 – Two wire serial ID interface data line (SDA)
Module Definition 1 – Two wire serial ID interface clock line (SCL)
Module Definition 0 – Grounded in module (module present indicator)
Note 1
Note 2
Note 3
Note 3
Note 3
3
4
5
6
7
8
RX_LOS
VeeR
Loss of Signal – High indicates loss of received optical signal
Receiver Ground
Note 4
9
10
11
12
13
14
15
16
17
18
19
20
Notes:
VeeR
Receiver Ground
VeeR
Receiver Ground
RD-
Inverse Received Data Out
Received Data Out
Note 5
Note 5
RD+
VeeR
Receiver Ground
VccR
Receiver Power + 3.3 V
Transmitter Power + 3.3 V
Transmitter Ground
Note 6
Note 6
VccT
VeeT
TD+
Transmitter Data In
Note 7
Note 7
TD-
Inverse Transmitter Data In
Transmitter Ground
VeeT
1. TX_FAULT is an open collector/drain output, which must be pulled up with a 4.7k – 10kΩ resistor on the host board. When high, this output
indicates a laser fault of some kind. Low indicates normal operation. In the low state, the output will be pulled to < 0.8V.
2. TX_DISABLE is an input that is used to shut down the transmitter optical output. It is internally pulled up (within the transceiver) with a 6.8kΩ
resistor.
Low (0 – 0.8V):
Between (0.8V and 2.0V):
High (2.0 – Vcc max) or OPEN:
Transmitter on
Undefined
Transmitter Disabled
3. The signals Mod-Def 0, 1, 2 designate the two wire serial interface pins. They must be pulled up with a 4.7k – 10kΩ resistor on the host board.
Mod-Def 0 is grounded by the module to indicate the module is present
Mod-Def 1 is serial clock line (SCL) of two wire serial interface
Mod-Def 2 is serial data line (SDA) of two wire serial interface
4. RX_LOS (Rx Loss of Signal) is an open collector/drain output that must be pulled up with a 4.7k – 10kΩ resistor on the host board. When high,
this output indicates the received optical power is below the worst case receiver sensitivity (as defined by the standard in use). Low indicates
normal operation. In the low state, the output will be pulled to < 0.8V.
5. RD-/+ designate the differential receiver outputs. They are AC coupled 100Ω differential lines which should be terminated with 100Ω
differential at the host SERDES input. AC coupling is done inside the transceiver and is not required on the host board. The voltage swing on
these lines will be between 600 and 1600 mV differential (300 – 800 mV single ended) when properly terminated.
6. VccR and VccT are the receiver and transmitter power supplies. They are defined at the SFP connector pin. The maximum supply current is 300
mA and the associated in-rush current will typically be no more than 30 mA above steady state after 2 microseconds.
7. TD-/+ designate the differential transmitter inputs. They are AC coupled differential lines with 100 Ω differential termination inside the module.
The AC coupling is done inside the module and is not required on the host board. The inputs will accept differential swings of 400 – 2400 mV
(200 – 1200mV single ended), though it is recommended that values between 500 and 1200 mV differential (250 – 600 mV single ended) be
used for best EMI performance.
7
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