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MF-27WXD 查看數據表(PDF) - Mitsumi

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MF-27WXD Datasheet PDF : 15 Pages
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MITSUBISHI (OPTICAL DEVICES)
MF-27WXD Series
2.5Gbps SFP TRANSCEIVER MODULE
10. Pin Descriptions
Pin No. Function
1,17,20 TX GND
10,
11,14
16
RX GND
TX Vcc *
15
RX Vcc *
18,19 TD+ / TD-
3
12,13
TX_DISAB
LE
RD+ / RD-
8
RX_LOS
2
TX_FAULT
6,5,4
MOD_DEF
[0:2]
7,9
Rate Select
0, 1
I/O
Pin description
I These pins are the Transmitter ground connections.
They should be connected to a low impedance ground plane (0V).
I These pins are the Receiver ground connections.
They should be connected to a low impedance ground plane (0V).
I This is the power supply pin for the Transceiver part.
It should be connected to +3.3V.
Recommended power supply decoupling. (See Figure 8)
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.
I This data input pin modulates the laser diode. When the TD+ input is asserted, the
laser diode is turned on.
They are internally AC-coupled into an equivalent load of RI differential, as shown
in Figure 8.
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.
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.
O Active high open collector/drain output that 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.
O Active high open collector/drain output that indicates a fault in the module. This
can be failure of the laser diode. Under this condition, 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.
The pull-up voltage is between 2.0 V and VccT (VccR) +0.3V.
Toggling TX_DISABLE high for at least t_reset can reset it.
See Figure 8 and Figure 5.
- 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)
They should be pulled up with 4.7Kohm -10Kohm resistor on the host board.
The pull-up voltage shall be VccT or VccR.
The serial ID definitions are as given in the “SFP-MSA” standard. See Figure 9.
I 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.
UQ9-06-008 Ed:1.0 Date:10.Oct.2006
Page 7 of 15

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