
SP-FE-LX-xDFM
DS-5851 Rev 022010-05-06
3
TX Disable
Transmitter Disable
3
Note 2
4
MOD-DEF2
Module Definition 2
3
Note 3
5
MOD-DEF1
Module Definition 1
3
Note 3
6
MOD-DEF0
Module Definition 0
3
Note 3
7
Rate Select
Not Connected
3
8
LOS
Loss of Signal
3
Note 4
9
VeeR
Receiver Ground
1
10
VeeR
Receiver Ground
1
11
VeeR
Receiver Ground
1
12
RD-
Inv. Received Data Out
3
Note 5
13
RD+
Received Data Out
3
Note 5
14
VeeR
Receiver Ground
1
15
VccR
Receiver Power
2
16
VccT
Transmitter Power
2
17
VeeT
Transmitter Ground
1
18
TD+
Transmit Data In
3
Note 6
19
TD-
Inv. Transmit Data In
3
Note 6
20
VeeT
Transmitter Ground
1
Notes:
1. TX Fault is an open collector output, which should be pulled up with a 4.7k~10k
Ω resistor on the host board to
a voltage between 2.0V and Vcc+0.3V. Logic 0 indicates normal operation; logic 1 indicates a laser fault of
some kind. In the low state, the output will be pulled to less than 0.8V.
2. TX Disable is an input that is used to shut down the transmitter optical output. It is pulled up within the module
with a 4.7k~10k
Ω resistor. Its states are:
Low (0~0.8V):
Transmitter on
(>0.8V, <2.0V):
Undefined
High (2.0~3.465V):
Transmitter Disabled
Open:
Transmitter Disabled
3. MOD-DEF 0,1,2 are the module definition pins. They should be pulled up with a 4.7k~10k
Ω resistor on the host
board. The pull-up voltage shall be VccT or VccR.
MOD-DEF 0 is grounded by the module to indicate that the module is present
MOD-DEF 1 is the clock line of two wires serial interface for serial ID
MOD-DEF 2 is the data line of two wires serial interface for serial ID
4. LOS is an open collector output, which should be pulled up with a 4.7k~10k
Ω resistor on the host board to a
voltage between 2.0V and Vcc+0.3V. Logic 0 indicates normal operation; logic 1 indicates loss of signal. In the
low state, the output will be pulled to less than 0.8V.
5. These are the differential receiver output. They are internally AC-coupled 100 differential lines which should
be terminated with 100 (differential) at the user SERDES.
6. These are the differential transmitter inputs. They are AC-coupled, differential lines with 100 differential
termination inside the module.
EEPROM Information