MITSUBISHI (OPTICAL DEVICES)
MF-27WXD Series
2.5Gbps SFP TRANSCEIVER MODULE
10. Pin Descriptions
Pin No.
Function
I/O
Pin description
1,17,20 TX GND
I
These pins are the Transmitter ground connections.
They should be connected to a low impedance ground plane(0V).
9,10,
11,14
16
RX GND
TX Vcc *
I
I
These pins are the Receiver ground connections.
They should be connected to a low impedance ground plane(0V).
This is the power supply pin for the Transceiver part.
It should be connected to +3.3V.
Recommended power supply decoupling. (See Figure 8)
15
RX Vcc *
TD+ / TD-
I
I
This is the power supply pin for the Receiver part.
It should be connected to +3.3V.
Recommended power supply decoupling. (See Figure 8)
* Both TX Vcc and RX Vcc have been internally connected due to supply of
control circuit Vcc.
This data input pin modulates the laser diode. When the TD+ input is asserted, the
laser diode is turned on.
18,19
They are internally AC-coupled into an equivalent load of RI differential, as shown
in Figure 8.
3
TX_DISAB
LE
I
Active high TTL input, with internal 7.4k ohm pull-up resistor to Vcc.
Asserting the transmitter disable will deactivate the laser within the assert time.
Table 1 indicates the timing of TX_DISABLE.
12,13
RD+ / RD-
O
Received Data Out and Inverted Received Data Out are differential serial output
from the receiver.
These are AC-coupled 100 ohm differential lines which should be terminated with
a 100 ohm (differential) at the user SERDES, as shown in Figure 8. AC coupling is
done inside the module and is thus not required on the host board.
Active high open collector/drain output which indicates a loss-of-signal condition
(LOS). When the average optical power received by the module is below the
Assert Level, RX_LOS is indicated.
Table 1 indicates the timing of RX_LOS. RX_LOS requires a 4.7k to 10k ohm
pull-up resistor external to the module, i.e., in the host system Host_Vcc, as shown
in Figure 8.
The pull-up voltage is between 2.0 V and VccR(VccT) + 0.3 V.
Active high open collector/drain output which indicates a fault in the module. This
can be failure of the laser diode. Under this conditions, TX_FAULT will activate
and be latched. And then the laser will be deactivated within the assert time.
TX_FAULT also requires a 4.7k to 10k ohm pull-up resistor externally, i.e. in the
host system Host_Vcc, as shown in Figure 8.
8
2
RX_LOS
O
O
TX_FAULT
The pull-up voltage is between 2.0 V and VccT(VccR) +0.3V.
It can be reset by toggling TX_DISABLE high for at least t_reset.
See Figure 8 and Figure 5.
6,5,4
MOD_DEF
[0:2]
-
I
This module has a serial ID function which provides information about the
transceiver’s capabilities, standard interfaces, manufacturer and other information.
This function is provided via a two wire serial EEPROM interface.
MOD_DEF[0] is connected to ground inside the module.(LOW)
MOD_DEF[1] is the serial clock signal input.(SCL)
MOD_DEF[2] is the data output/input.(SDA)
The serial ID definitions are as given in the “SFP-MSA” standard.
See Figure 9.
These pins defined the bandwidth filters. 7pin/9pin setting=[*/*]:
[0/0]:Full bandwidth, [1/0]:1.25Gbps, [0/1]:622Mbps, [1/1]:155Mbps
These input pins are internally pulled down to GND with 33Kohm resistor.
If this function is not used, both pins should be left open or connected to GND.
7,9
Rate Select
0, 1
UQ9-05-003 Ed:1.0 Date:9.Sep.2005
Page 7 of 15
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