FTLX3871MCCxx Product Specification
I.
Pin Descriptions
Pin
1
2
3
4
5
6
7
Symbol
Name/Description
Ref.
1
2
3
2
2
2
4
VEET
TFAULT
TDIS
SDA
SCL
Transmitter Ground
Transmitter Fault
Transmitter Disable. Laser output disabled on high or open.
2-wire Serial Interface Data Line
2-wire Serial Interface Clock Line
Module Absent. Grounded within the module
Rate Select 0.
MOD_ABS
RS0
8
9
RX_LOS
RS1
Loss of Signal indication. Logic 0 indicates normal operation.
Rate Select 1.
5
4
10
11
12
13
14
15
16
17
18
19
20
VEER
VEER
RD-
RD+
VEER
VCCR
VCCT
VEET
Receiver Ground
Receiver Ground
Receiver Inverted DATA out. AC Coupled.
Receiver Non-inverted DATA out. AC Coupled.
Receiver Ground
Receiver Power Supply
Transmitter Power Supply
Transmitter Ground
1
1
1
6
6
1
TD+
TD-
VEET
Transmitter Non-Inverted DATA in. AC Coupled.
Transmitter Inverted DATA in. AC Coupled.
Transmitter Ground
1
Notes:
1. Circuit ground is internally isolated from chassis ground.
2. is an open collector/drain output, which should be pulled up with a 4.7k – 10k Ohms resistor on
T
FAULT
the host board if intended for use. Pull up voltage should be between 2.0V to Vcc + 0.3V. A high
output indicates a transmitter fault caused by either the TX bias current or the TX output power
exceeding the preset alarm thresholds. A low output indicates normal operation. In the low state, the
output is pulled to <0.8V.
3. Laser output disabled on TDIS >2.0V or open, enabled on TDIS <0.8V.
4. Internally pulled down per SFF-8431 Rev 4.1. See Sec. X of this datasheet for the logic table to use for
the internal CDRs locking modes.
5. LOS is open collector output. Should be pulled up with 4.7k – 10k on host board to a voltage
between 2.0V and 3.6V. Logic 0 indicates normal operation; logic 1 indicates loss of signal.
6. Internally connected
VeeT
20
19
18
17
16
15
14
13
12
11
VeeT
1
2
TD-
TX_Fault
TX_Disable
SDA
TD+
3
VeeT
VccT
VccR
VeeR
RD+
RD-
4
5
SCL
Towards
Bezel
Towards
ASIC
6
MOD_ABS
RS0
7
8
RX_LOS
RS1
9
VeeR
VeeR
10
Figure 1. Diagram of Host Board Connector Block Pin Numbers and Names.
Finisar Corporation – September 2015
Rev. C1
Page 3
FINISAR [ FINISAR CORPORATION. ]
