TXN31115D2 Optical Transceiver
Table 10.
Plug Sequence: Pin Engagement Sequence during Hot Plugging (Sheet 2 of 2)
Pin
Number
Plug
Sequence
Pin Name
Pin Function
Notes
Inverted Received Data
out
12
13
RD-
RD+
3
3
Note 6
Note 6
Non-Inverted Received
Data out
14
15
V
R
Receiver Ground
Receiver Power
1
2
2
1
3
3
1
–
ee
V R
Note 7
Note 7
–
cc
16
V T
Transmitter Power
Transmitter Ground
Non-inverted Data In
Inverted Data In
Transmitter Ground
cc
17
V T
ee
18
TD+
TD-
Note 8
Note 8
–
19
20
V T
ee
NOTES:
1. TX FAULT is an open collector output that is 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
•
•
Low: Indicates normal operation. In the low state, the output is pulled to < 0.8 V.
High: Indicates a laser fault.
2. TX DISABLE is an input used to shut down the transmitter optical output. It is pulled up within the
TXN31115D2 Optical Transceiver with a 4.7 K - 10 K W resistor. 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
3. MOD-DEF 0, 1, 2: These pins are definition pins for the TXN31115D2 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
cc
V.
•
MOD-DEF 0 is grounded by the TXN31115D2 Optical Transceiver to indicate the TXN31115D2 Optical
Transceiver is present.
•
•
MOD-DEF 1 is the clock line of a two-wire serial interface for serial ID.
MOD-DEF 2 is the data line of a two-wire serial interface for serial ID.
4. RATE SELECT: This signal function is not implemented in the TXN31115D2 Optical Transceiver. The
TXN31115D2 Optical Transceiver is rate agile – that is, it meets the specifications for 1.0625 Gbps to
4 Gbps data rates without the use of a rate-select pin.
5. LOS (Loss of Signal) is an open collector output that is pulled up with a 4.7K – 10KW resistor on the host
board.
•
•
When low, this output indicates normal operation. In the low state, the output is pulled to < 0.8V.
When high, this output indicates the received optical power is below the worst-case receiver sensitivity
(as defined by the standard in use).
6. 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
TXN31115D2 Optical Transceiver and is therefore not required on the host board.
7. V R and V T are the receiver and transmitter power supplies. Their values, which are listed in Table 2,
cc
cc
“Recommended Operating Conditions” on page 8, are defined at the SFP connector pin. Maximum supply
current is listed in Table 3, “Electrical Characteristics – Power and Current” on page 9. Hot plugging of the
TXN31115D2 Optical Transceiver results in the inrush current listed in Table 3, “Electrical Characteristics –
Power and Current” on page 9.
8. TD-/+ are the differential transmitter inputs. They are AC-coupled differential lines with 100 W differential
termination inside TXN31115D2 Optical Transceiver. The AC coupling is performed inside the TXN31115D2
Optical Transceiver and is therefore not required on the host board.
Intel® TXN31115D2 Quad-Rate 850 nm Optical Transceiver - SFP MSA Compatible
Datasheet
26-Sep-2007
Document Number: 311473, Revision: 006US
13