MF-27WXE Ver la hoja de datos (PDF) - MITSUBISHI ELECTRIC
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MF-27WXE Datasheet PDF : 14 Pages
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MITSUBISHI (OPTICAL DEVICES)
MF-27WXE Series
100Mbps-2.7Gbps, Multi-Rate DWDM SFP TRANSCEIVER MODULE
9. 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, RX GND
I These pins are the Receiver ground connections.
11,14
They should be connected to a low impedance ground plane (0V).
16
TX Vcc *
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)
15
RX Vcc *
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.
18,19 TD+ / TD-
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.
3
TX_DISABLE 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.
8
RX_LOS
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.
2
TX_FAULT 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.
6,5,4 MOD_DEF
- This module has a serial ID function, which provides information about the
[0:2]
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.
7
NUC
- These pins are No User Connection and should be left open.
UQ9-06-010 Ed:1.4 Date:02.Nov.2006
Page 7 of 14
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