Table 3. Pin Description
Pin
Name
Function/Description
Notes
1
VeeT
Transmitter Ground
2
TX_FAULT
TX_DISABLE
MOD-DEF2
MOD-DEF1
MOD-DEF0
Rx Rate Select RS(0)
RX_LOS
Tx Rate Select RS(1)
VeeR
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)
Receiver rate select. Logic High = 14.025 Gb/s, Logic Low = 8.5 Gb/s and 4.25 Gb/s
Loss of Signal – High indicates loss of received optical signal
Note 1
Note 2
Note 3
Note 3
Note 3
Note 8
Note 4
3
4
5
6
7
8
9
Transmitter rate select. Logic High = 14.025 Gb/s, Logic Low = 8.5 Gb/s and 4.25 Gb/s Note 8
10
11
12
13
14
15
16
17
18
19
Receiver Ground
Receiver Ground
VeeR
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
20
VeeT
Notes:
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 indi-
cates 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):
Transmitter on
Undefined
High (2.0 – Vcc max) or OPEN: 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 370 and 850 mV differential (185 – 425 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 180 – 1200 mV (90
– 600mV single ended)
8. Rate_Select is an input that is used to control transmit and receive high speed parametric optimizaton. It is internally pulled down (within the
transceiver) with a 40kOhm resistor.
Low (0 - 0.8V) or Open:
Between (0.8V and 2.0V)
High (2.0 - Vcc max):
Rate is set to 8.5Gb/s and below optimization. The CDR is bypassed.
Undefined
Rate is set to 14.025Gb/s optimization. The CDR is engaged.
8
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