Product Features
● Uncooled Laser Diodewith MQW Structure
● InGaAs PIN-TIA Photodiode Receiver
● 9/125μm SMF
● BIDI Single Mode Transceiver SFP Footprint
● LC Or SC Optical Interface Are Optional
● Compliant With SFP MSA and SFF-8472
● Digital Diagnostic Monitoring Interface
● Single +3.3V Power Supply
● CML Differential Inputsand Outputs
● LVTTL Signal Detection Output
● Compliant With ITU-TG.957
● Compliant With RoHS and LeadFree
● Metal Enclosure for Lower EMI
● Operating Case Temperature:
      Standard: 0 to +70℃
      Extend: -20 to +85℃
      Industrial: -40 to +85℃

Product Applications
● Fast Ethernet
● ATM/SONET/SDH
● Switch/Router
● Other Optical Transmission Systems

Absolute Maximum Ratings

Parameter Symbol Min Max Unit
Storage Temperature Tst -40 +85 °C
Operating Temperature TO BYCS-Bxx12-20D 0 +70 °C
BYCS-Bxx12-20DE -20 +85 °C
BYCS-Bxx12-20DI -40 +85 °C
Input Voltage – GND VCC V
Power Supply Voltage VCC-VEE 0 +3.6 V
Note: Stress in excess of maximum absolute ratings can cause permanent damage to the module.

Recommended Operating Conditions

Parameter Symbol Min Typ Max Unit
Storage Temperature Tst -40 – +85 °C
Operating Case Temperature TC BYCS-Bxx12-20D 0 – +70 °C
BYCS-Bxx12-20DE -20 – +85 °C
BYCS-Bxx12-20DI -40 – +85 °C
Power Supply Voltage VCC 3.1 3.3 3.5 V
Power Supply Current ICC – – 300 mA
Data Rate DR – 155 – Mbps
Optical Specification
Transmitter
Parameter Symbol Min Typ Max Unit Note
Center Wavelength 1310 FP   1261 1310 1360 nm
1550 1501 1550 1600
Spectral Width 1310nmFP   – – 4 nm –
1550nm DFB 1
Average Optical Output Power Po -9 – -3 dBm 20KM
Extinction Ratio ER 9 – – dB –
Optical Rise/Fall Time(20%-80%) Tr/Tf – – 0.27 ns –
Output Eye Diagram Compliant with ITU-T G.957
Receiver
Parameter Symbol Min Typ Max Unit Note
Operate Wavelength 1550 – 1501 1550 1600 nm
1310 – 1261 1310 1360 nm
Receiver Sensitivity RSENS – – -24 dBm 1
Receiver Saturation PRS -3 – – dBm 1
LOS Assert – -40 – – dBm Alarm: High-level
LOS De-Assert – – – -24 dBm
LOS Hysteresis – 0.5 – 5 dBm –

Electrical Specification

Transmitter
Parameter Symbol Min Typ Max Unit Note
Power Supply Current ICCT – 70 150 mA 2
Input Differential Impedance ZIN 90 100 110 Ω –
Input Swing Differential Voltage VIN 500 – 2400 mV 3
TX-Disable Voltage Disable – 2.0 – VCC V –
Enable – 0 – 0.8 V –
TX-Fault Voltage Fault – 2.0 – VCC V –
Normal – 0 – 0.8 V –
Receiver
Parameter Symbol Min Typ Max Unit Note
Power Supply Current ICCR – 70 140 mA 2
Output Swing Differential Voltage VOUT 600 – 2000 mV 4
LOS Voltage High – 2.0 – VCC V –
Low – 0 – 0.8 V –
Note: 

1. Minimum Sensitivity and saturation levels for a 223-1 PRBS test pattern @155Mbps.
2. The current excludes the output load current.
3. CML input, internally AC-coupled and terminated
4. Internally AC-coupled.
4. Internally AC-coupled.

Package Diagram
Board Layout Hole Pattern