FTLX3813M3xx Product Specification – August 2015
Finisar Corporation August 2015 Rev. D1 Page 4
I. Pin Descriptions
Optional –5.2 Power Supply – Not required
Module De-select; When held low allows the module to
respond to 2-wire serial interface commands
Interrupt
Interrupt (bar); Indicates presence of an important condition
which can be read over the serial 2-wire interface
Transmitter Disable; Transmitter laser source turned off
Serial 2-wire interface clock
Serial 2-wire interface data line
Module Absent; Indicates module is not present. Grounded
in the module.
Module Not Ready; Finisar defines it as a logical OR
between RX_LOS and Loss of Lock in TX/RX.
Receiver Loss of Signal indicator
Receiver inverted data output
Receiver non-inverted data output
+1.8V Power Supply – Not required
Power Down; When high, places the module in the low
power stand-by mode and on the falling edge of P_Down
Reset; The falling edge initiates a complete reset of the
module including the 2-wire serial interface, equivalent to a
+1.8V Power Supply – Not required
Reference Clock non-inverted input, AC coupled on the
host board – Not required
Reference Clock inverted input, AC coupled on the host
board – Not required
Transmitter inverted data input
Transmitter non-inverted data input
Notes:
1. Module circuit ground is isolated from module chassis ground within the module.
2. Open collector; should be pulled up with 4.7k – 10kohms on host board to a voltage between 3.15V
and 3.6V.
