SPT-P854G-S5D 4.25Gbps SFP Optical Transceiver, 500m Reach

SPT-P854G-S5D

4.25Gbps SFP Optical Transceiver, 500m Reach

Features

Single 3.3 V supply
Up to 500m on 50/125µm MMF, 300m on 62.5/125µm MMF
Supports 1.0625/2.125/4.25Gb/s Fiber Channel Operation
Gigabit Ethernet compatible
850nm VCSEL laser transmitter
SFP MSA SFF-8074i compliant
Digital Diagnostic SFF-8472 compliant
Compatible with RoHS
Operating case temperature:
Standard: 0 to +70°C
Industrial: -40 to +85°C

Applications

Tri Rate 1.0625 / 2.125 / 4.25Gbp/s Fiber Channel
1.25Gbp/s 1000Base-LX Ethernet and 1000Base-LX10

Description
The transceiver consists of three sections: an 850nm VCSEL laser transmitter, a PIN photodiode integrated with a trans-impedance preamplifier (TIA) and MCU control unit. All modules satisfy class I laser safety requirements.
The transceivers are compatible with the Small Form Factor Pluggable Multi-Sourcing Agreement (MSA) 1. They are compatible with Fiber Channel per FC-PI-2 Rev. 10.0.also simultaneously compatible with Gigabit Ethernet as specified in IEEE Std 802.3.
　
Module Block Diagram

4.25Gbps SFP Optical Transceiver

Absolute Maximum Ratings

Parameter	Symbol	Min.	Max.	Units	Notes
Storage Temperature	Tst	-40	+85	°C	-
Operating Case Temperature	Tc	0	70	°C	-
Operating Humidity	RH	5	90	%	Non-condensing
Power Supply Voltage	Vcc-Vee	0	3.6	V	-

Recommended Operating Conditions

Parameter		Symbol	Min	Typical	Max	Unit
Operating Case Temperature	Standard	Tc	0		+70	°C
Operating Case Temperature	Industrial	Tc	-40		+85	°C
Power Supply Voltage		Vcc	3.13	3.3	3.47	V
Power Supply Current		Icc			240	mA

　Optical and Electrical Characteristics
SPT-P854G-S5D: (VCSEL and PIN, 850nm, 500m, Reach)

Parameter		Symbol	Min	Typical	Max	Unit	Notes
Transmitter
DataRate				4.25		Gb/S
Centre Wavelength		λc	830		860	nm
Spectral Width		∆λ			1	nm
Average Output Power(BOL)		Pout	-9		-2.5	dBm	1
Extinction Ratio		ER	5			dB
Average Launch Power-OFF Transmitter		Pout			-45	dBm
Optical Eye Diagram		Fiber Channel Compliant
Optical Rise/Fall Time(20%~80%)		tr/tf			120	ns
Data Input Swing Differential		VIN	300		1800	mV	2
Input Differential Impedance		ZIN	90	100	110	Ω
TX Disable	Disable		2.0		Vcc	V
TX Disable	Enable		0		0.8	V
TX Fault	Fault		2.0		Vcc	V
TX Fault	Normal		0		0.8	V
Receiver
Centre Wavelength		λc	830		860	nm
Receiver Sensitivity(BOL)		Sen			-15	dBm	3
Receiver Overload		Sat	0			dBm	3
LOS De-Assert		LOSD			-20	dBm
LOS Assert		LOSA	-25			dBm
LOS Hysteresis			0.5		6	dB
ReceiverReflectance					-20	dB
Data Output Swing Differential		Vout	350		1800	mV	4
Loss of Signal (LOS) Assert Time		T Assert			500	nS
Loss of Signal (LOS) Deassert Time		T Deassert			500	nS
LOS		High	2.0		Vcc	V
LOS		Low			0.8	V

Notes：
1. The optical power is launched into MMF.
2. PECL input, internally AC-coupled and terminated.
3. Measured with a PRBS 2 -1 test pattern @4250Mbps, BER ≤1×10
4. CML Output, internally AC-coupled.

Timing and Electrical

Parameter	Symbol	Min	Typical	Max	Unit
Tx Disable Negate Time	t_on			1	ms
Tx Disable Assert Time	t_off			10	µs
Time To Initialize, Including Reset of Tx Fault	t_init			300	ms
Tx Fault Assert Time	t_fault			100	µs
Tx Disable To Reset	t_reset	10			µs
LOS Assert Time	t_loss_on			100	µs
LOS De-assert Time	t_loss_off			100	µs
Serial ID Clock Rate	f_serial_clock			400	KHz
MOD_DEF(0:2)-High	VH	2		Vcc	V
MOD_DEF(0:2)-Low	VL			0.8	V

Diagnostics

Parameter	Range	Unit	Accuracy	Calibration
Temperature	0 to +70	°C	±3°C	Internal/External
Temperature	-40 to +85	°C	±3°C	Internal/External
Voltage	3.0 to 3.6	V	±3%	Internal/External
Bias Current	0 to 100	mA	±10%	Internal/External
TX Power	-9 to -3	dBm	±3dB	Internal/External
RX Power	-23 to -3	dBm	±3dB	Internal/External

　Digital Diagnostic Map
The transceivers provide serial ID memory contents and diagnostic information about the present operating conditions by the 2-wire serial interface (SCL, SDA).
The diagnostic information with internal calibration or external calibration all are implemented, including received power monitoring, transmitted power monitoring, bias current monitoring, supply voltage monitoring and temperature monitoring.
The digital diagnostic memory map specific data field defines as following.

Pin Definitions

Pin Definitions
Pin Diagram

Pin Diagram

　Pin Descriptions

Pin	Signal Name	Description	PlugSeq.	Notes
1	VEET	Transmitter Ground	1
2	TX FAULT	Transmitter Fault Indication	3	Note1
3	TX DISABLE	Transmitter Disable	3	Note2
4	MOD_DEF(2)	SDA Serial Data Signal	3	Note3
5	MOD_DEF(1)	SCL Serial Clock Signal	3	Note3
6	MOD_DEF(0)	TTL Low	3	Note3
7	Rate Select	Not Connected	3
8	LOS	Loss of Signal	3	Note4
9	VEER	Receiver Ground	1
10	VEER	Receiver Ground	1
11	VEER	Receiver Ground	1
12	RD-	Inv. Received Data Out	3	Note5
13	RD+	Received Data Out	3	Note5
14	VEER	Receiver Ground	1
15	VCCR	Receiver Power Supply	2
16	VCCT	Transmitter Power Supply	2
17	VEET	Transmitter Ground	1
18	TD+	Transmit Data In	3	Note6
19	TD-	Inv. Transmit Data In	3	Note6
20	VEET	Transmitter Ground	1

Notes:
Plug Seq.: Pin engagement sequence during hot plugging.
1) TX Fault is an open collector output, which should be pulled up with a 4.7k~10kΩ resistor on the host board to a voltage between 2.0V and Vcc+0.3V. Logic 0 indicates normal operation; Logic 1 indicates a 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~10kΩ resistor. Its states are:
　　Low (0 to 0.8V): Transmitter on
　　(>0.8V, < 2.0V): Undefined
　　High (2.0 to 3.465V): Transmitter Disabled
　　Open: Transmitter Disabled
3) Mod-Def. 0, 1, 2. These are the module definition pins. They should be pulled up with a 4.7k~10kΩ 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~10kΩ resistor. Pull up voltage between 2.0V and Vcc+0.3V. Logic 1 indicates loss of signal; Logic 0 indicates normal operation. In the low state, the output will be pulled to less than 0.8V.
5) RD-/+: These are the differential receiver outputs. They are internally AC-coupled 100 differential lines which should be terminated with 100Ω (differential) at the user SERDES.
6) TD-/+: These are the differential transmitter inputs. They are internally AC-coupled, differential lines with 100Ω differential termination inside the module.
　Recommended Interface Circuit