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SFP 155M 20km
    • Up to 155Mbps data links
    • 1310nm FP Laser and PIN photo-detector
    • Up to 20km on 9/125µm SMF
    • Duplex LC receptacle optical interface compliant
    • Hot pluggable                     
    • All-metal housing for superior EMI performance
    • RoHS6 compliant (lead free)
    • Operating case temperature:
Commercial: -5°C to +70°C      
Extended: -20°C to +80°C
Industrial: -40°C to +85°C    
    • SONET OC-3 / SDH STM-1 
    • Fast Ethernet
    • Switch to Switch interface
    • Switched backplane applications
    • Router/Server interface
    • Other optical transmission systems
    • Compliant with SFP MSA
    • Compliant with SFF-8472
    • Compatible with G.957

The SFP transceivers are high performance, cost effective modules supporting data-rate of 155Mbps and 20km transmission distance with SMF.
The transceivers are compatible with SFP Multi-Source Agreement (MSA) and SFF-8472. For further information, please refer to SFP MSA and SFF-8472.

Module Block Diagram

Absolute Maximum Ratings
Power Supply VoltageVCC03.6V
Storage Temperature Ts-40+85°C
Operating Case TemperatureTc-40+85°C
Relative HumidityRH085%
RX Input Average PowerPmax-0dBm

Recommended Operating Environment 
Power Supply VoltageVcc3.133.33.46V
Power Supply CurrentIcc300mA
Operating Case TemperatureCommercialTc-5+70°C
Data Rate125/155Mbps

Electrical Characteristics
Transmitter Section
SingleEndedDataInputSwingVin PP2501000mV1
Transmit Disable Voltage VDVcc – 1.3VccV
Transmit Enable Voltage VENVeeVee+ 0.8V
Receiver Section
LOS FaultVlos faultVcc – 0.5Vcc_hostV2
LOS NormalVlos normVeeVee+0.5V2

1. Connected directly to TX data input pins. AC coupling from pins into laser driver IC.
2. LOS is an open collector output. Should be pulled up with 4.7kΩ – 10kΩ on the host board. Normal operation is logic 0; loss of signal is logic 1.

Optical Parameters
Transmitter Section
Centre Wavelengthλc126013101360nm
Spectral Width (RMS)σ3nm
Average Optical Power (avg.)Pout-13-6dBm1
Laser Off PowerPoff---45dBm
Extinction RatioER9--dB2
Relative Intensity NoiseRIN---128dB/Hz
Optical Rise/Fall Timetr/tf-1300ps3
Optical Return Loss Tolerance--12dB
Output Optical EyeCompliant with ITU-T G.9574
Receiver Section
Receiver Center Wavelengthλc12601620nm
Receiver Sensitivity in Average Power Sen-32-3dBm4
Los AssertLOSA-45--dBm
Los DessertLOSD---34dBm
Los HysteresisLOSH0.5-5dB
Receiver Reflectance---12dB
Receiver Power (damage)--0dBm

1. The optical power is launched into 9/125µm SMF.
2. Measured with a PRBS223-1 test pattern @155Mbps.
3. Unfiltered, 20-80%.Measured with a PRBS 223-1 test pattern @155Mbps.
4. Measured with a PRBS 223-1 test pattern @155Mbps, ER=10dB, BER<10-12.

Timing Characteristics
TX_Disable Assert Timet_off10us
TX_Disable Negate Timet_on1ms
Time to Initialize Include Reset of TX_FAULTt_init300ms
TX_FAULT from Fault to Assertiont_fault100us
TX_Disable Time to Start Resett_reset10us
Receiver Loss of Signal Assert Time TA, RX_LOS100us
Receiver Loss of Signal Deassert Time Td, RX_LOS100us
Rate-Select Change Timet_ratesel10us
Serial ID Clock Timef_serial-clock100kHz

Digital Diagnostic Monitor Characteristics (DDM)
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 stuff.

Temperature Monitor Absolute ErrorDMI_Temp-33°C
Laser Power Monitor Absolute ErrorDMI_TX-33dB
RX Power Monitor Absolute ErrorDMI_RX-33dB
Supply Voltage Monitor Absolute ErrorDMI_VCC-33V
Bias Current Monitor Absolute ErrorDMI_Ibias-10%10%mA

Digital Diagnostic Memory Map (Compliant with SFF-8472)
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 (For further information, please refer to SFF-8472).

Pin Definitions

Pin Descriptions
PinSignal NameDescriptionPlug Seq.Notes
1VeeTTransmitter Ground1
2TX FAULTTransmitter Fault Indication31
3TX Disable Transmitter Disable32
4MOD_DEF(2)I²C Serial Data Signal SDA33
5MOD_DEF(1)I²C Serial Clock Signal SCL33
6MOD_DEF(0)Grounded in Module33
7Rate SelectNot Connected3
8LOSReceiver Loss of Signal Indicator (Active  high, open-drain)34
9VeeRReceiver Ground1
10VeeRReceiver Ground1
11VeeRReceiver Ground1
12RD- Inv. Received Data Out35
13RD+Received Data Out35
14VeeRReceiver Ground1
15VccRReceiver Power Supply2
16VccTTransmitter Power Supply2
17VeeTTransmitter Ground1
18TD+Transmit Data In36
19TD-Inv. Transmit Data In36
20VeeTTransmitter Ground12

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;
Between (>0.8V,< 2.0V): Undefined;
High (2.0 to 3.465V): Transmitter Disabled;
Open: Transmitter Disabled.
3. Mod-Def0, 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 SCL.
MOD_DEF (2) is the data line of two wire serial interface for serial ID SDA.
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

Mechanical Dimensions

Ordering information
Part NumberProduct Description
YSP01-31201310nm, 155Mbps, 20km, Duplex LC SFP Transceiver, -5ºC ~ +70ºC, With DDM.
YSP01-3120E1310nm, 155Mbps, 20km, Duplex LC SFP Transceiver, -20ºC ~ +80ºC, With DDM.
YSP01-3120T1310nm, 155Mbps, 20km, Duplex LC SFP Transceiver, -40ºC ~ +85ºC, With DDM.

1. Small Form Factor Pluggable (SFP) Transceiver Multi-Source Agreement (MSA), September 2000.
2. Telcordia GR-253-CORE and ITU-T G.957 Specifications.
3. “Diagnostic Monitoring Interface for Optical Transceivers” SFF-8472, Rev 10.2, June 1, 2007.

Important Notice
Performance figures, data and any illustrative material provided in this data sheet are typical and must be specifically confirmed in writing by YOUTHTON before they become applicable to any particular order or contract. In accordance with the YOUTHTON policy of continuous improvement specifications may change without notice. The publication of information in this data sheet does not imply freedom from patent or other protective rights of YOUTHTON or others. Further details are available from any YOUTHTON sales representative.

Contact Information
EMAIL: info@youthton.com