FTCS-1312-10Dxx

1.25Gb/s 1310nm Single-mode SFP Transceiver

Product Features

• Up to 1.25Gb/s data links
• 1310nm FP laser transmitter and PIN photo-detector
• Up to 10km on 9/125µm SMF
• Hot-pluggable SFP footprint
• Duplex LC/UPC type pluggable optical interface
• Low power dissipation
• Metal enclosure, for lower EMI
• RoHS compliant and lead-free
• Single +3.3V power supply
• Support Digital Diagnostic Monitoring interface
• Compliant with SFF-8472
• Meet ESD requirements, resist 8KV direct contact voltage
• Case operating temperature
• Commercial: 0°C to +70°C
• Extended: -10°C to +80°C
• Industrial: -40°C to +85°C

Applications

• Switch to Switch Interface
• Gigabit Ethernet
• 1xFiber channel Application
• Switched Backplane Applications
• Router/Server Interface
• Other Optical Links

Product Description

F-tone’s FTCS-1312-10Dxx Small Form Factor Pluggable (SFP) transceivers are compatible with the Small Form Factor Pluggable Multi-Sourcing Agreement (MSA). The transceiver consists of five sections: the LD driver, the limiting amplifier, the digital diagnostic monitor, the FP laser and the PIN photo-detector.The module data link up to 10KM in 9/125um single mode fiber.

The optical output can be disabled by a TTL logic high-level input of Tx Disable, and the system also can disable the module via I2C. Tx Fault is provided to indicate that degradation of the laser. Loss of signal (LOS) output is provided to indicate the loss of an input optical signal of receiver or the link status with partner. The system can also get the LOS (or Link)/Disable/Fault information via I2C register access.

Part Number Ordering Information

Product part Number	Data Rate (Mbps)	Media	Wavelength (nm)	Transmission Distance(km)	Temperature Range（Tcase）（℃）	Temperature Range（Tcase）（℃）
FTCS-1312-10D	1250	Single mode fiber	1310	10	0~70	commercial
FTCS-1312-10DE	1250	Single mode fiber	1310	10	-10~80	extended
FTCS-1312-10DI	1250	Single mode fiber	1310	10	-40~85	industrial

Pin Descriptions

Pin	Symbol	Name/Description	NOTE
1	VEET	Transmitter Ground (Common with Receiver Ground)	1
2	TFAULT	Transmitter Fault.
3	TDIS	Transmitter Disable. Laser output disabled on high or open.	2
4	MOD_DEF (2)	Module Definition 2. Data line for Serial ID.	3
5	MOD_DEF (1)	Module Definition 1. Clock line for Serial ID.	3
6	MOD_DEF (0)	Module Definition 0. Grounded within the module.	3
7	Rate Select	No connection required	4
8	LOS	Loss of Signal indication. Logic 0 indicates normal operation.	5
9	VEER	Receiver Ground (Common with Transmitter Ground)	1
10	VEER	Receiver Ground (Common with Transmitter Ground)	1
11	VEER	Receiver Ground (Common with Transmitter Ground)	1
12	RD-	Receiver Inverted DATA out. AC Coupled
13	RD+	Receiver Non-inverted DATA out. AC Coupled
14	VEER	Receiver Ground (Common with Transmitter Ground)	1
15	VCCR	Receiver Power Supply
16	VCCT	Transmitter Power Supply
17	VEET	Transmitter Ground (Common with Receiver Ground)	1
18	TD+	Transmitter Non-Inverted DATA in. AC Coupled.
19	TD-	Transmitter Inverted DATA in. AC Coupled.
20	VEET	Transmitter Ground (Common with Receiver Ground)	1

Notes:

• Circuit ground is internally isolated from chassis ground.
• Laser output disabled on TDIS >2.0V or open, enabled on TDIS <0.8V.
• Should be pulled up with 4.7k – 10kohms on host board to a voltage between 2.0V and 3.6V.MOD_DEF (0) pulls line low to indicate module is plugged in.
• This is an optional input used to control the receiver bandwidth for compatibility with multiple data rates (most likely Fiber Channel 1x and 2x Rates).If implemented, the input will be internally pulled down with > 30kΩ resistor. The input states are:
• Low (0 – 0.8V): Reduced Bandwidth
• (>0.8, < 2.0V): Undefined
• High (2.0 – 3.465V): Full Bandwidth
• Open: Reduced Bandwidth
• LOS is open collector output should be pulled up with 4.7k – 10kohms on host board to a voltage between 2.0V and 3.6V. Logic 0 indicates normal operation; logic 1 indicates loss of signal.

Pin Definitions and Pin Diagram

Figure2. Pin out of Connector Block on Host Board

Absolute Maximum Ratings

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Storage Temperature	Ts	-40		85	ºC
Relative Humidity	RH	5		95	%
Power Supply Voltage	VCC	-0.5		4	V
Signal Input Voltage		-0.3		Vcc+0.3	V
Receiver Damage Threshold		+5			dBm

Recommended Operating Conditions

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Case Operating Temperature	Tcase	0		70	ºC	FTCS-1312-10D
Case Operating Temperature	Tcase	-10		80	ºC	FTCS-1312-10DE
Case Operating Temperature	Tcase	-40		85	ºC	FTCS-1312-10DI
Power Supply Voltage	VCC	3.13	3.3	3.47	V
Power Supply Current	ICC			250	mA
Power Supply Noise Rejection				100	mVp-p	100Hz to 1MHz
Data Rate			1250/1250		Mbps	TX Rate/RX Rate
Transmission Distance				10	KM
Coupled Fiber	Single mode fiber	Single mode fiber	Single mode fiber	Single mode fiber	Single mode fiber	9/125um SMF

Specification of Transmitter

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Average Output Power	POUT	-9		-3	dBm	Note (1)
Extinction Ratio	ER	9			dB
Center Wavelength	λC	1270	1310	1360	nm
Side Mode Suppression Ratio	SMSR	–			dB
Spectrum Bandwidth (RMS)	σ			3.5	nm
Transmitter OFF Output Power	POff			-45	dBm
Output Eye Mask	Compliant with IEEE802.3 z (class 1 laser safety)	Compliant with IEEE802.3 z (class 1 laser safety)	Compliant with IEEE802.3 z (class 1 laser safety)	Compliant with IEEE802.3 z (class 1 laser safety)		Note (2)

Notes:

• Measure at 2^7-1 NRZ PRBS pattern
• Transmitter eye mask definition

Specification of Receiver

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Input Optical Wavelength	λIN	1270		1610	nm	PIN-TIA
Receiver Sensitivity	PIN			-20	dBm	Note (1)
Input Saturation Power (Overload)	PSAT	-3			dBm
Los Of Signal Assert	PA	-36			dBm
Los Of Signal De-assert	PD			-21	dBm	Note (2)
LOS Hysteresis	PA-PD	0.5	2	6	dB

Notes:

• Measured with Light source 1310nm, ER=9dB; BER =<10^-12 @PRBS=2^7-1 NRZ
• When LOS de-asserted, the RX data+/- output is High-level (fixed)

Electrical Interface Characteristics

Parameter	Symbol	Min.	Typ.	Max.	Unit	Note
Power Consumption	P			0.85	W
Supply Current	Icc			250	mA
Transmitter	Transmitter	Transmitter	Transmitter	Transmitter	Transmitter	Transmitter
Single-ended Input Voltage Tolerance	VCC	-0.3		4.0	V
Differential Input Voltage Swing	Vin,pp	100		800	mVpp
Differential Input Impedance	Zin	90	100	110	Ohm
Transmit Disable Assert Time				5	us
Transmit Disable Voltage	Vdis	Vcc-1.3		Vcc	V
Transmit Enable Voltage	Ven	Vee-0.3		0.8	V
Receiver	Receiver	Receiver	Receiver	Receiver	Receiver	Receiver
Differential Output Voltage Swing	Vout,pp	500		900	mVpp
Differential Output Impedance	Zout	90	100	110	Ohm
Data output rise/fall time	Tr/Tf		100		ps	20% to 80%
LOS Assert Voltage	VlosH	Vcc-1.3		Vcc	V
LOS De-assert Voltage	VlosL	Vee-0.3		0.8	V

Digital Diagnostic Functions

F-tone’s FTCS-1312-10Dxx transceivers support the 2-wire serial communication protocol as defined in the SFP MSA. It is very closely related to the E2PROM defined in the GBIC standard, with the same electrical specifications.

The standard SFP serial ID provides access to identification information that describes the transceiver’s capabilities, standard interfaces, manufacturer, and other information.

Additionally, F-tone’s SFP transceivers provide a unique enhanced digital diagnostic monitoring interface, which allows real-time access to device operating parameters such as transceiver temperature, laser bias current, transmitted optical power, received optical power and transceiver supply voltage. It also defines a sophisticated system of alarm and warning flags, which alerts end-users when particular operating parameters are outside of a factory set normal range.

The SFP MSA defines a 256-byte memory map in E2PROM that is accessible over a 2-wire serial interface at the 8 bit address 1010000X (A0h). The digital diagnostic monitoring interface makes use of the 8 bit address 1010001X (A2h), so the originally defined serial ID memory map remains unchanged. The interface is identical to, and is thus fully backward compatible with both the GBIC Specification and the SFP Multi Source Agreement.

The operating and diagnostics information is monitored and reported by a Digital Diagnostics Transceiver Controller (DDTC) inside the transceiver, which is accessed through a 2-wire serial interface. When the serial protocol is activated, the serial clock signal (SCL, Mod Def 1) is generated by the host. The positive edge clocks data into the SFP transceiver into those segments of the E2PROM that are not write-protected. The negative edge clocks data from the SFP transceiver. The serial data signal (SDA, Mod Def 2) is bi-directional for serial data transfer. The host uses SDA in conjunction with SCL to mark the start and end of serial protocol activation. The memories are organized as a series of 8-bit data words that can be addressed individually or sequentially.

Digital diagnostics for the FTCS-1312-10Dxx are internally calibrated by default.

Recommend Circuit Schematic

Mechanical Specifications (Unit: mm)

Regulatory Compliance

Feature	Reference	Performance
Electrostatic discharge（ESD）	IEC/EN 61000-4-2	Compatible with standards
Electromagnetic Interference (EMI)	FCC Part 15 Class B EN 55022 Class B (CISPR 22A)	Compatible with standards
Laser Eye Safety	FDA 21CFR 1040.10, 1040.11 IEC/EN 60825-1，2	Class 1 laser product
Component Recognition	IEC/EN 60950 ，UL	Compatible with standards
ROHS	2002/95/EC	Compatible with standards
EMC	EN61000-3	Compatible with standards

Ordering Information

Part Number	Product Description
FTCS-1312-10D	SFP+ Transceiver, 1310nm, 1.25Gbps, 10km, with DDM, 0°C~+70°C,
FTCS-1312-10DE	SFP+ Transceiver, 1310nm, 1.25Gbps, 10km, with DDM, -10°C~+80°C,
FTCS-1312-10DI	SFP+ Transceiver, 1310nm, 1.25Gbps, 10km, with DDM, -40°C~+85°C,