FTLX8512D3BCL XFP Product Specification
Finisar Corporation – September 2015 Rev. D1 Page 2
I. Pin Descriptions
Pin Logic Symbol Name/Description Ref.
1 GND Module Ground 1
2 VEE5 Optional –5.2 Power Supply – Not required
3 LVTTL-I Mod-Desel Module De-select; When held low allows the module to
respond to 2-wire serial interface commands
4 LVTTL-O
Interrupt
Interrupt (bar); Indicates presence of an important condition
which can be read over the serial 2-wire interface
2
5 LVTTL-I TX_DIS Transmitter Disable; Transmitter laser source turned off
6 VCC5 +5 Power Supply – Not required
7 GND Module Ground 1
8 VCC3 +3.3V Power Supply
9 VCC3 +3.3V Power Supply
10 LVTTL-I SCL Serial 2-wire interface clock 2
11 LVTTL-
I/O
SDA Serial 2-wire interface data line 2
12 LVTTL-O Mod_Abs Module Absent; Indicates module is not present. Grounded
in the module.
2
13 LVTTL-O Mod_NR Module Not Ready; Finisar defines it as a logical OR
between RX_LOS and Loss of Lock in TX/RX.
2
14 LVTTL-O RX_LOS Receiver Loss of Signal indicator 2
15 GND Module Ground 1
16 GND Module Ground 1
17 CML-O RD- Receiver inverted data output
18 CML-O RD+ Receiver non-inverted data output
19 GND Module Ground 1
20 VCC2 +1.8V Power Supply – Not required
21 LVTTL-I P_Down/RST Power Down; When high, places the module in the low
power stand-by mode and on the falling edge of P_Down
initiates a module reset
Reset; The falling edge initiates a complete reset of the
module including the 2-wire serial interface, equivalent to a
power cycle.
22 VCC2 +1.8V Power Supply – Not required
23 GND Module Ground 1
24 PECL-I RefCLK+ Reference Clock non-inverted input, AC coupled on the
host board – Not required
3
25 PECL-I RefCLK- Reference Clock inverted input, AC coupled on the host
board – Not required
3
26 GND Module Ground 1
27 GND Module Ground 1
28 CML-I TD- Transmitter inverted data input
29 CML-I TD+ Transmitter non-inverted data input
30 GND Module Ground 1
Notes:
1. Module circuit ground is isolated from module chassis ground within the module.
2. Open collector; should be pulled up with 4.7k – 10k on host board to a voltage between 3.15V and
3.6V.
3. A Reference Clock input is not required by the FTLX8512D3BCL. If present, it will be ignored.
