Table 2. Pin description
Pin
1
Name
Function/Description
MSA Notes
VeeT
Transmitter Ground
2
TX Fault
TX Disable
MOD-DEF2
MOD-DEF1
MOD-DEF0
Rate Select
LOS
Transmitter Fault Indication
Transmitter Disable - Module disables on high or open
Module Definition 2 - Two wire serial ID interface
Module Definition 1 - Two wire serial ID interface
Module Definition 0 - Grounded in module
Not Connected
Note 1
Note 2
Note 3
Note 3
Note 3
3
4
5
6
7
8
Loss of Signal
Note 4
9
VeeR
Receiver Ground
10
11
12
13
14
15
16
17
18
19
20
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 5%
Transmitter Power - 3.3 V 5%
Transmitter Ground
Note 6
Note 6
VccT
VeeT
TD+
Transmitter Data In
Note 7
Note 7
TD-
Inverse Transmitter Data In
Transmitter Ground
VeeT
Notes:
1. TX Fault is an open collector/drain output, which should be pulled up with a 4.7K – 10KΩ resistor on the host board. Pull up voltage between
2.0 V and VccT, R+0.3 V. When high, output indicates a laser fault of some kind. Low indicates normal operation. In the low state, the output will
be pulled to < 0.8 V. By default, TX_FAULT is set to trigger on hardware faults only.
2. TX Disable input is used to shut down the laser output per the state table below with an external 4.7 - 10 KΩ pull-up resistor.
Low (0 - 0.8 V): Transmitter on
Between (0.8 V and 2.0 V): Undefined
High (2.0 - 3.465 V): Transmitter Disabled
Open: Transmitter Disabled
3. MOD-DEF 0,1,2. These are the module definition pins. They should be pulled up with a 4.7 - 10 KΩ resistor on the host board to a supply less
than VccT +0.3 V or VccR+0.3 V.
MOD-DEF 0 is grounded by the module to indicate that the module is present
MOD-DEF 1 is clock line of two wire serial interface for optional serial ID
MOD-DEF 2 is data line of two wire serial interface for optional serial ID
4. LOS (Loss of Signal) is an open collector/drain output which should be pulled up externally with a 4.7K - 10 KΩ resistor on the host board to a
supply < VccT,R+0.3 V. 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 < 0.8 V.
5. RD-/+: These are the differential receiver outputs. They are ac coupled 100Ω differential lines which should be terminated with 100Ω 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 500 and 2000 mV differential (250 - 1000 mV single ended) when properly terminated.
6. VccR and VccT are the receiver and transmitter power supplies. They are defined as 3.135 - 3.465 V at the SFP connector pin. The maximum sup-
ply current is 250 mA and the associated inrush current will be no more than 30 mA above steady state after 500 nanoseconds.
7. TD-/+: These are the differential transmitter inputs. They are ac coupled differential lines with 100Ω 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 (250 - 1200 mV 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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