Parameter			Symbol	Min.	Typ.	Max	Unit	Notes
Transmitter
CML inputs(Differential)			Vin	150	-	1200	mVpp	AC coupled inputs
Input impedance (Differential)			Zin	85	100	115	ohm	Rin > 100 kohms@ DC
Tx_DISABLE input voltage - high			-	2	-	Vcc+0.3	V	-
Tx_DISABLE input voltage - low			-	0	-	0.8	V	-
Tx_FAULT output voltage - high			-	2	-	Vcc+0.3	V	Io = 400µA; Host Vcc
Tx_FAULT output voltage - low			-	0	-	0.5	V	Io = -4.0mA
Receiver
CML Outputs (Differential)			Vout	120	-	800	mVpp	AC coupled outputs
Output impedance (Differential)			Zout	85	100	115	ohms	-
Rx_LOS output voltage - high			-	2	-	0.5	V	lo = 400µA; Host Vcc
Rx_LOS output voltage - low			-	0	-	700	mVpp	lo = -4.0mA
MOD_DEF ( 2:0 )			VoH	2.5	-	-	V	With serial ID
			VoL	0	-	0.5	V

 

Notes:

1) TX Fault is an open collector/drain output, which should be pulled up with a 4.7K – 10KΩ resistoron the host board. Pull up voltage between 2.0V and VccT/R+0.3V. When high, output indicates a laser fault of some kind. Low indicates normal operation. In the low state, the output will be pulled to < 0.8V.

2) TX disable is an input that is used to shutdown the transmitter optical output. It is pulled up within the module with a 4.7K – 10 KΩ resistor. Its states are:
Low (0 – 0.8V):Transmitter on
(>0.8, < 2.0V): Undefined
High (2.0 – 3.465V): Transmitter Disabled
Open: Transmitter Disabled

3) Module Absent, connected to VeeT or VeeR in the module.

4) RX LOS (Loss of Signal) is an open collector/drain output, which should be pulled up with a 4.7K – 10KΩ resistor. Pull up voltage between 2.0V and VccT/R+0.3V. 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 < 0.8V.

5) The module signal ground contacts, VeeR and VeeT, should be isolated from the module case.

6) RD-/+: These are the differential receiver outputs. They are AC coupled 100Ω differential lines which should be terminated with 100Ω (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 120 and 800 mV differential (60 –400 mV single ended) when properly terminated.

7) VccR and VccT are the receiver and transmitter power supplies. They are defined as 3.3V ±5% at the SFP+ connector pin. Maximum supply current is 606mA. Recommended host board power supply filtering is shown below. Inductors with DC resistance of less than 1 ohm should be used in order to maintain the required voltage at the SFP+ input pin with 3.3V supply voltage. When the recommended supply-filtering network is used, hot plugging of the SFP+ transceiver module will result in an inrush current of no more than 30mA greater than the steady state value. VccR and VccT may be internally connected within the SFP+ transceiver module.

8) TD-/+: These are the differential transmitter inputs. They are AC-coupled, differential lines with 100Ω 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 150 – 1200 mV (75 – 600mV single-ended).