Finisar FTLX3811M322 User Manual
FTLX3811M3xx DWDM XFP Product Specification – January 2011
F i n i s a r
© Finisar Corporation 11-January-2011
Rev C1
Page 3
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
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
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
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.
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
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
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.
module including the 2-wire serial interface, equivalent to a
power cycle.
22
VCC2
+1.8V
Power
Supply
23
GND
Module
Ground
1
24
PECL-I
RefCLK+
Reference Clock non-inverted input, AC coupled on the
host board – Not required
host board – Not required
25
PECL-I
RefCLK-
Reference Clock inverted input, AC coupled on the host
board – Not required
board – Not required
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 – 10kohms on host board to a voltage between 3.15V
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.