Intel® TXN31015D2 Quad-Rate 850 nm Optical Transceiver - SFF* MSA Compatible
Table 10.
Pin Assignment (Sheet 2 of 2)
Pin
Number
Pin Name
Pin Function
Note
C
–
Not used
–
Transmit Fault
Indication
D
Tx Fault output
Note 8
NOTES:
1.
VeeR and VeeT are the signal grounds, there 2 grounds are
internally separated within the SFF module.
2.
V R and V T are the receiver and transmitter power supplies.
cc
cc
Their values, which are listed in Table 2, “Recommended Operating
Conditions” on page 8, are defined at the SFF pin assignment.
Maximum supply current is listed in Table 3, “Electrical
Characteristics – Power and Current” on page 9.
SD (Signal Detect) is a TTL output and has an internal 10K pull-up
resistor to VccR.
3.
•
•
When low, this output indicates the received optical power is below
the worst-case receiver sensitivity. In the low state, the output is
pulled to < 0.8V.
When high, this output indicates normal operation (as defined by the
standard in use).
4.
5.
RD-/+ are the differential receiver outputs. They are AC-coupled
100 W differential lines that are terminated with 100 W
(differential) at the user SerDes. The AC coupling is performed
inside the TXN31015D2 Optical Transceiver and is therefore not
required on the host board.
TX DISABLE is a TTL input used to shut down the transmitter optical
output. The states are as follows:
•
•
•
Low (0 - 0.6 V): Transmitter Enabled
(>0.8, <2.0 V): Undefined
High (2.0 - 3.465 V): Transmitter Disabled
TD-/+ are the differential transmitter inputs. They are AC-coupled
differential lines with 100 W differential termination inside
TXN31015D2 Optical Transceiver. The AC coupling is performed
inside the TXN31015D2 Optical Transceiver and is therefore not
required on the host board.
6.
7.
MOD-DEF 1, 2: These pins are definition pins for the TXN31015D2
Optical Transceiver. They are pulled up with a 4.7 K - 10 K W
resistor on the host board. Use a pull-up voltage between 2.0 V and
V T, R+0.3 V.
cc
•
•
MOD-DEF 1 is the clock line of a 2-wire serial interface for serial ID.
MOD-DEF 2 is the data line of a 2-wire serial interface for serial ID.
TX FAULT is a TTL output and has an internal 10k pull-up resistor to
VccT.
8.
•
•
Low: Indicates normal operation. In the low state, the output is
pulled to < 0.8 V.
High: Indicates a laser fault.
Figure 1 shows the TXN31015D2 Optical Transceiver electrical interface pin numbers.
Intel® TXN31015D2 Quad-Rate 850 nm Optical Transceiver - SFF* MSA Compatible
Datasheet
18-April-2007
Order Number: 316366, Revision: 001US
13