1.25G Spring-Latch SFP Transceiver

10~20km transmission, RoHS compliance

Feb. 12, 2007

Fiberxon Proprietary and Confidential, Do Not Copy or Distribute

Page 8 of 8

laser fault of some kind. In the low state, the output will be pulled to less than 0.8V.

2. TX Disable is an input that is used to shut down the transmitter optical output. It is pulled up within the

module with a 4.7k~10k

Ω resistor. Its states are:

Low (0~0.8V):

Transmitter on

(>0.8V, <2.0V):

Undefined

High (2.0~3.465V):

Transmitter Disabled

Open:

Transmitter Disabled

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

Ω resistor on

the host board. The pull-up voltage shall be VccT or VccR.

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

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

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

4. LOS is an open collector output, which should be pulled up with a 4.7k~10k

Ω resistor on the host board to

a voltage between 2.0V and Vcc+0.3V. Logic 0 indicates normal operation; logic 1 indicates loss of signal.

In the low state, the output will be pulled to less than 0.8V.

5. These are the differential receiver output. They are internally AC-coupled 100Ω differential lines which

should be terminated with 100Ω (differential) at the user SERDES.

6. These are the differential transmitter inputs. They are AC-coupled, differential lines with 100Ω differential

termination inside the module.

Mechanical Design Diagram

The mechanical design diagram is shown in Figure 4.

55.7± 0.1

41.8± 0.15

45.0± 0.2

34.6± 0.1

LABEL

Tx

6.25± 0.05

Rx

Figure 4, Mechanical Design Diagram of the SFP with Spring-Latch