7

Notes:

1. TX_FAULT is an open collector/drain output, which must be pulled up with a 4.7 k – 10 kΩ resistor on the host board. When high, this 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.

2. TX_DISABLE is an input that is used to shut down the transmitter optical output. It is internally pulled up (within the transceiver) with a 6.8 kΩ

resistor.

Low (0 – 0.8 V):

Transmitter on

Between (0.8 V and 2.0 V):

Undefined

High (2.0 – Vcc max) or OPEN:

Transmitter Disabled

3. The signals Mod-Def 0, 1, 2 designate the two wire serial interface pins. They must be pulled up with a 4.7 k – 10 kΩ resistor on the host board.

Mod-Def 0 is grounded by the module to indicate the module is present

Mod-Def 1 is serial clock line (SCL) of two wire serial interface

Mod-Def 2 is serial data line (SDA) of two wire serial interface

4. RX_LOS (Rx Loss of Signal) is an open collector/drain output that must be pulled up with a 4.7 k – 10 kΩ resistor on the host board. 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-/+ designate the differential receiver outputs. They are AC coupled 100 Ω differential lines which should be terminated with 100 Ω differential

at the host SERDES input. AC coupling is done inside the transceiver and is not required on the host board. The voltage swing on these lines will

be between 600 and 1600 mV differential (300 – 800 mV single ended) when properly terminated.

6. VccR and VccT are the receiver and transmitter power supplies. They are defined at the SFP connector pin. The maximum supply current is 300

mA and the associated in-rush current will typically be no more than 30 mA above steady state after 2 microseconds.

7. TD-/+ designate the differential transmitter inputs. They are AC coupled differential lines with 100 Ω differential termination inside the module.

The AC coupling is done inside the module and is not required on the host board. The inputs will accept differential swings of 400 – 2400 mV

(200 – 1200 mV single ended), although it is recommended that values between 500 mV and 1200 mV differential (250-600 mV single ended)

be used for best EMI performance.

Table 2. Pin Description

Pin

Name

Function/Description

Notes

1

VeeT

Transmitter Ground

2

TX_FAULT

Transmitter Fault Indication – High indicates a fault condition

Note 1

3

TX_DISABLE

Transmitter Disable – Module optical output disables on high or open

Note 2

4

MOD-DEF2

Module Definition 2 – Two wire serial ID interface data line (SDA)

Note 3

5

MOD-DEF1

Module Definition 1 – Two wire serial ID interface clock line (SCL)

Note 3

6

MOD-DEF0

Module Definition 0 – Grounded in module (module present indicator)

Note 3

7

N.C.

8

RX_LOS

Loss of Signal – High indicates loss of received optical 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

Note 6

16

VccT

Transmitter Power + 3.3 V

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