Table 2. Pin Description
Engagement
Pin
1
Name
VeeT
Function/Description
Order(insertion)
Notes
Transmitter Ground
1
3
3
3
3
3
3
3
1
1
1
3
3
1
2
2
1
3
3
1
2
TX Fault
TX Disable
MOD-DEF2
MOD-DEF1
MOD-DEF0
Rate Selection
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
1
2
3
3
3
3
4
5
6
7
8
Loss of Signal
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
5
5
RD+
VeeR
Reciver Ground
VccR
Receiver Power -3.3 V 5%
Transmitter Power -3.3 V 5%
Transmitter Ground
6
6
VccT
VeeT
TD+
Transmitter Data In
7
7
TD-
Inverse Transmitter Data In
Transmitter Ground
VeeT
Notes:
1. TX Fault is an open collector/drain output which should be pulled up externally with a 4.7KΩ – 10 KΩ resistor on the host board to a supply
<VccT+0.3 V or VccR+0.3 V. 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 < 0.8 V.
2. TX disable input is used to shut down the laser output per the state table below. It is pulled up within the module with a 4.7-10 KΩ resistor.
Low (0 – 0.8 V):
Between (0.8 V and 2.0 V):
High (2.0 – 3.465 V):
Open:
Transmitter on
Undefined
TransmitterDisabled
TransmitterDisabled
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 4.7 K – 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 operatio0n. 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 100 Ω differential lines which should be terminated with 100 Ω 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 must be
between 370 and 2000 mV differential (185 – 1000 mV single ended) according to the MSA. Typically it will be 1500mv differential.
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 in-rush current will
typically be no more than 30 mA above steady state supply current after 500 nanoseconds.
7. TD-/+: These are 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 thus not required on the host board. The inputs will accept differential swings of 500 – 2400 mV (250 –
1200 mV single ended). However, the applicable recommended differential voltage swing is found in Table 5.
8
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