AFCT-5701Z Datasheet, PDF (7/20 Pages) AVAGO TECHNOLOGIES LIMITED – Families of Single-Mode Small Form Factor Pluggable (SFP) Optical Transceivers

Table 2. Pin description
Pin Name
1
VeeT
Function/Description
Transmitter Ground
Engagement
Order(insertion)
1
Notes
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 Definition 2 - Two wire serial ID interface
3
3
5
MOD-DEF1
Module Definition 1 - Two wire serial ID interface
3
3
6
MOD-DEF0
Module Definition 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): 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 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 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 100  differential lines which should be terminated with 100  differ-
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 differential (185 – 1000 mV single ended) according to the MSA. Typically it will be 1500mv differen-
tial.
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  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.
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