恒通未来 HTFUTURE CO.

, LIMITED
www.htfuture.com The leader of fiber transmission

1250Mb/s SFP 1310nm 10km Optical Transceiver Module

HTSF-S1G31Lx
Features
 Up to 1250Mb/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
 Support Digital Diagnostic Monitoring interface
Applications
 Single +3.3V power supply
 Compliant with SFF-8472  Switch to Switch Interface
 Case operating temperature  Gigabit Ethernet
Commercial: 0 ~ +70oC  Switched Backplane Applications
Extended: -10 ~ +80oC  Router/Server Interface
Industrial: -40 ~ +85oC  Other Optical Links

Part Number Ordering Information

Data Rate Wavelength Transmission Temperature (oC)
Part Number
(Gb/s) (nm) Distance(km) (Operating Case)

HTSF-S1G31LC 1.25 1310 10km SMF 0~70 commercial

HTSF-S1G31LE 1.25 1310 10km SMF -10~80 Extended

HTSF-S1G31LI 1.25 1310 10km SMF -40~85 Industrial

1. Absolute Maximum Ratings

It has to be noted that the operation in excess of any individual absolute maximum ratings
might cause permanent damage to this module.

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Parameter Symbol Min Max Unit Notes

o
Storage Temperature TS -40 85 C

Power Supply Voltage VCC -0.3 3.6 V

Relative Humidity (non-
condensation) RH 5 95 %
Damage Threshold THd 5 dBm

2. Recommended Operating Conditions and Power Supply

Requirements
Parameter Symbol Min Typical Max Unit Notes

0 70 commercial
Operating Case o
TOP -10 80 C extended
Temperature
-40 85 industrial

Power Supply Voltage VCC 3.135 3.3 3.465 V

Data Rate 1250 Mb/s

Control Input Voltage High 2 Vcc V

Control Input Voltage Low 0 0.8 V

Link Distance (SMF) D 10 km 9/125um

3. General Description
HTF’HTSF-S1G31Lx 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.

4. Pin Assignment and Pin Description

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Figure1. Diagram of host board connector block pin numbers and names

PIN Name Name/Description Notes

1 VEET Transmitter Ground (Common with Receiver Ground) 1

2 TXFAULT Transmitter Fault.

Transmitter Disable. Laser output disabled on high or
3 TXDIS 2
open.
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

Loss of Signal indication. Logic 0 indicates normal
8 LOS 5
operation.
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

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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:
1. Circuit ground is internally isolated from chassis ground.
2. Laser output disabled on TDIS >2.0V or open, enabled on TDIS <0.8V.
3. 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.
4. 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:
1) Low (0 – 0.8V): Reduced Bandwidth
2) (>0.8, < 2.0V): Undefined
3) High (2.0 – 3.465V): Full Bandwidth
4) Open: Reduced Bandwidth
5. 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.

5. Specification of Transmitter Electrical Characteristics

The following electrical characteristics are defined over the Recommended Operating
Environment unless otherwise specified.

Parameter Symbol Min. Typical Max Unit Notes

0.85 commercial
Power Consumption P W
0.9 Industrial

250 commercial
Supply Current Icc mA
270 Industrial

Transmitter
Single-ended Input
VCC -0.3 4.0 V
Voltage Tolerance
Differential Input Voltage Vin,pp 200 2400 mVpp

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Swing
Differential Input
Zin 90 100 110 Ohm
Impedance
Transmit Disable Assert
5 us
Time
Transmit Disable Voltage Vdis Vcc-1.3 Vcc V

Transmit Enable Voltage Ven Vee-0.3 0.8 V

Receiver
Differential Output
Vout,pp 500 900 mVpp
Voltage Swing
Differential Output
Zout 90 100 110 Ohm
Impedance

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

6. Optical Characteristics
The following optical characteristics are defined over the Recommended Operating
Environment unless otherwise specified.

Parameter Symbol Min. Typical Max Unit Notes

Transmitter

Center Wavelength λC 1270 1310 1360 nm

Spectrum Bandwidth(RMS) σ 3.5 nm

Average Optical Power PAVG -9 -3 dBm 1

Optical Extinction Ratio ER 9 dB

Transmitter OFF Output
POff -45 dBm
Power
Compliant with 802.3z(class 1 laser
Transmitter Eye Mask 2
safety)
Receiver

Center Wavelength λC 1270 1610 nm

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Receiver Sensitivity (Average

Sen. -20 dBm 3
Power)
Input Saturation Power
Psat -3 dBm
(overload)
LOS Assert LOSA -36 dB 4

LOS De-assert LOSD -21 dBm 4

LOS Hysteresis LOSH 0.5 dBm

Notes:
1. Measure at 2^7-1 NRZ PRBS pattern
2. Transmitter eye mask definition.
3. Measured with Light source 1310nm, ER=9dB; BER =<10^-12
@PRBS=2^7-1 NRZ
4. When LOS de-asserted, the RX data+/- output is High-level (fixed).

7. Digital Diagnostic Functions

The following digital diagnostic characteristics are defined over
the Recommended Operating Environment unless otherwise
specified. It is compliant to SFF8472 Rev10.2 with internal
calibration mode. For external calibration mode please contact
our sales staff.

Parameter Symbol Min. Max Unit Notes

Temperature monitor absolute DMI_ Over operating
-3 3 degC
error Temp temp
Supply voltage monitor absolute Full operating
DMI _VCC -0.15 0.15 V
error range
RX power monitor absolute error DMI_RX -3 3 dB

Bias current monitor DMI_ bias -10% 10% mA

TX power monitor absolute error DMI_TX -3 3 dB

8. Mechanical Dimensions

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Figure2. Mechanical Outline

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