7
Table 2. Pin description
Pin Name Function/Description
Engagement
Order(insertion) Notes
1 VeeT Transmitter Ground 1
2 TX Fault Transmitter Fault Indication 3 1
3 TX Disable Transmitter Disable - Module disables on high or open 3 2
4 MOD-DEF2 Module De nition 2 - Two wire serial ID interface 3 3
5 MOD-DEF1 Module De nition 1 - Two wire serial ID interface 3 3
6 MOD-DEF0 Module De nition 0 - Grounded in module 3 3
7 Rate Selection Not Connected 3
8 LOS Loss of Signal 3 4
9 VeeR Receiver Ground 1
10 VeeR Receiver Ground 1
11 VeeR Receiver Ground 1
12 RD- Inverse Received Data Out 3 5
13 RD+ Received Data Out 3 5
14 VeeR Reciver Ground 1
15 VccR Receiver Power -3.3 V ±5% 2 6
16 VccT Transmitter Power -3.3 V ±5% 2 6
17 VeeT Transmitter Ground 1
18 TD+ Transmitter Data In 3 7
19 TD- Inverse Transmitter Data In 3 7
20 VeeT Transmitter Ground 1
Notes:
1. TX Fault is an open collector/drain output which should be pulled up externally with a 4.7K – 10 K 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 K resistor.
Low (0 – 0.8 V): Transmitter on
Between (0.8 V and 2.0 V): Unde ned
High (2.0 – 3.465 V): Transmitter Disabled
Open: Transmitter Disabled
3. Mod-Def 0,1,2. These are the module de nition pins. They should be pulled up with a 4.7-10 K 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 K 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 de ned 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 di erential receiver outputs. They are AC coupled 100 di erential lines which should be terminated with 100 di er-
ential 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 di erential (185 – 1000 mV single ended) according to the MSA. Typically it will be 1500mv di eren-
tial.
6. VccR and VccT are the receiver and transmitter power supplies. They are de ned 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 di erential transmitter inputs. They are AC coupled di erential lines with 100 di erential 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 di erential swings of
500 – 2400 mV (250 – 1200 mV single ended). However, the applicable recommended di erential voltage swing is found in Table 5.
