7

Table 2. Pin description

Pin

Name

Function/Description

MSA Notes

1

VeeT

Transmitter Ground

2

TX Fault

Transmitter Fault Indication

Note 1

3

TX Disable

Transmitter Disable - Module disables on high or open

Note 2

4

MOD-DEF2

Module Definition 2 - Two wire serial ID interface

Note 3

5

MOD-DEF1

Module Definition 1 - Two wire serial ID interface

Note 3

6

MOD-DEF0

Module Definition 0 - Grounded in module

Note 3

7

Rate Select

Not Connected

8

LOS

Loss of Signal

Note 4

9

VeeR

Receiver Ground

10

VeeR

Receiver Ground

11

VeeR

Receiver Ground

12

RD-

Inverse Received Data Out

Note 5

13

RD+

Received Data Out

Note 5

14

VeeR

Receiver Ground

15

VccR

Receiver Power - 3.3 V ±5%

Note 6

16

VccT

Transmitter Power - 3.3 V ±5%

Note 6

17

VeeT

Transmitter Ground

18

TD+

Transmitter Data In

Note 7

19

TD-

Inverse Transmitter Data In

Note 7

20

VeeT

Transmitter Ground

Notes:

1. TX Fault is an open collector/drain output, which should be pulled up with a 4.7K – 10K

 resistor on the host board. Pull up voltage between

2.0 V and VccT, R+0.3 V. When high, output indicates a laser fault of some kind. Low indicates normal operation. In the low state, the output will

be pulled to < 0.8 V. By default, TX_FAULT is set to trigger on hardware faults only.

2. TX Disable input is used to shut down the laser output per the state table below with an external 4.7 - 10 K

 pull-up resistor.

Low (0 - 0.8 V): Transmitter on

Between (0.8 V and 2.0 V): Undefined

High (2.0 - 3.465 V): Transmitter Disabled

Open: Transmitter Disabled

3. MOD-DEF 0,1,2. These are the module definition pins. They should be pulled up with a 4.7 - 10 K

 resistor on the host board to a supply less

than VccT +0.3 V or VccR+0.3 V.

MOD-DEF 0 is grounded by the module to indicate that the module is present

MOD-DEF 1 is clock line of two wire serial interface for optional serial ID

MOD-DEF 2 is data line of two wire serial interface for optional serial ID

4. LOS (Loss of Signal) is an open collector/drain output which should be pulled up externally with a 4.7K - 10 K

 resistor on the host board to a

supply < VccT,R+0.3 V. When high, this output indicates the received optical power is below the worst case receiver sensitivity (as defined by

the standard in use). Low indicates normal operation. In the low state, the output will be pulled to < 0.8 V.

5. RD-/+: These are the differential receiver outputs. They are ac coupled 100

 differential lines which should be terminated with 100 differential

at the user SERDES. The ac coupling is done inside the module and is thus not required on the host board. The voltage swing on these lines will

be between 320 and 2000 mV differential (160 - 1000 mV single ended) when properly terminated.

6. VccR and VccT are the receiver and transmitter power supplies. They are defined as 3.135 - 3.465 V at the SFP connector pin. The maximum sup-

ply current is 250 mA and the associated inrush current will be no more than 30 mA above steady state after 500 nanoseconds.

7. TD-/+: These are the differential transmitter inputs. They are ac coupled differential lines with 100

 differential termination inside the module.

The ac coupling is done inside the module and is thus not required on the host board. The inputs will accept differential swings of 500 - 2400

mV (250 - 1200 mV single ended), though it is recommended that values between 500 and 1200 mV differential (250 - 600 mV single ended) be

used for best EMI performance.