FTLX3815M3xx DWDM XFP Product Specification – Nov 2014
F i n i s a r
I.
Pin Descriptions
II.
Pin
1
Logic
Symbol
GND
VEE5
Name/Description
Module Ground
Optional –5.2 Power Supply – Not used
Ref.
1
2
3
LVTTL-I
LVTTL-O
LVTTL-I
Mod-Desel
Module De-select; When held low allows the module to
respond to 2-wire serial interface commands
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
+5 Power Supply
4
2
1
Interrupt
5
6
7
TX_DIS
VCC5
GND
Module Ground
8
9
10
11
VCC3
VCC3
SCL
+3.3V Power Supply
+3.3V Power Supply
Serial 2-wire interface clock
Serial 2-wire interface data line
LVTTL-I
LVTTL-
I/O
2
2
SDA
12
13
LVTTL-O
Mod_Abs
Mod_NR
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
Module Ground
2
2
LVTTL-O
LVTTL-O
14
15
16
17
18
19
20
21
RX_LOS
GND
GND
RD-
RD+
GND
VCC2
2
1
1
Module Ground
CML-O
CML-O
Receiver inverted data output
Receiver non-inverted data output
Module Ground
1
+1.8V Power Supply – Not used
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
23
24
VCC2
GND
RefCLK+
+1.8V Power Supply – Not used
Module Ground
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
1
PECL-I
PECL-I
25
RefCLK-
26
27
28
29
30
GND
GND
TD-
TD+
GND
Module Ground
Module Ground
Transmitter inverted data input
Transmitter non-inverted data input
Module Ground
1
1
CML-I
CML-I
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 – 10kohms on host board to a voltage between 3.15V
and 3.6V.
Rev.: A04
Page 2 of 23
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