Features ◊ Electrical interface compliant to SFF-8431 ◊ 850nm VCSEL laser and PIN photo-detector ◊ Maximum link length of 70m on OM3 MMF and 100m on OM4 MMF ◊ Digital diagnostics functions are available via the I2C interface ◊ Operating case temperature Commercial: 0°C to +70 °C ◊ +3.3V single power supply ◊ Power consumption less than 1W ◊ RoHS compliant ◊ Password protection for A0h and A2h Applications ◊ 25GBASE-SR Ethernet ◊ Servers, switches, storage and host card adapters Specification Absolute Maximum Ratings Table1- Absolute Maximum Ratings Parameter Symbol Min. Typical Max. Unit Notes Supply Voltage Vcc3 -0.5 - +3.6 V   Storage Temperature Ts -10 - +70 °C   Operating Humidity RH +5 - +85 % 1 Note: 1 No condensation Recommended Operating Conditions Parameter Symbol Min. Typical Max. Unit Notes Operating Case Temperature TC 0 - +70 °C   Power Supply Voltage Vcc 3.14 3.3 3.47 V   Power Supply Current Icc - - 300 mA   Power Dissipation Pd - - 1.0 W   Bit Rate BR 8.5 25.78125 - Gbps   Fiber Bend Radius Rb 3 - - cm   Table 2- Recommended operating Conditions Electrical Characteristics Table 3- Electrical Characteristics Parameter Symbol Min. Typ. Max. Units Notes                                          Transmitter Differential Data Input Swing Vin,P-P 200 - 1600 mVPP   Input Differential Impedance ZIN 90 100 110 Ω    Tx_Fault Normal Operation VOL 0 - 0.8 V   Transmitter Fault VOH 2.0 - VCC V    Tx_Disable Normal Operation VIL 0 - 0.8 V   Laser Disable VIH 2.0 - VCC+0.3 V   Receiver Differential Date Output Vout 400 - 800 mV   Output Differential Impedance ZD 90 100 110 Ω    Rx_LOS Normal Operation VOL 0 - 0.8 V   Lose Signal VoH 2.0 - VCC V   Optical Characteristics Table 4-Optical Characteristics Parameter Symbol Unit Min Typ Max Notes Optical transmitter Characteristics Bit Rate BR Gbps 8.5 25.78125 -   Center Wavelength Range λc nm 820 850 880   Average Launch powerTx_off Poff dBm - - -45   Launch Optical Power P0 dBm -6.0   2.4 1 Extinction Ratio ER dB 2 - -   Spectral Width(RMS) RMS nm - - 0.65   Optical Receiver Characteristics Bit Rate BR Gbps 8.5 25.78125     Bit Error Rate BER   - - E-12   Damage threshold DT dBm 3.4 - -   Overload Input OpticalPower PIN dBm 2.4 - - 2 Center Wavelength Range λc nm 820 - 880   Receiver Sensitivity inAverage Power Sen dBm - - -5.2 3 Los Assert LosA dBm -30 - -   Los De-Assert LosD dBm - - -13   Los Hysteresis LosH dB 0.5       Note: Coupled into 50/125 MMF. Measured with PRBS 231-1 test pattern @25.78125Gbps.BER=E-12 3. BER=1x10-12; PRBS231-1@25.78125Gbps. Recommended Host Board Power Supply Circuit Figure 1, Recommended Host Board Power Supply Circuit Recommended Interface Circuit   Figure 2, Recommended Interface Circuit Pin arrangement   Figure 3, Pin View Table 5-Pin Function Definitions Pin Symbol Name/Description Notes 1 VEET Module Transmitter Ground 1 2 TX_FAULT Module Transmitter Fault 2 3 TX_DISABLE Transmitter Disable; Turns off transmitter laser output 3 4 SDA 2-Wire Serial Interface Data Line (MOD-DEF2)   5 SCL 2-Wire Serial Interface Clock (MOD-DEF1)   6 MOD_ABS Module Absent, connected to VEET or VEER in the module 2 7 RS0 Rate Select 0, optionally controls SFP+ module receiver 4 8 RX_LOS Receiver Loss of Signal Indication (In FC designated as Rx_LOS and in Ethernet designated as NOT Signal Detect) 2 9 RS1 Rate Select 1, optionally controls SFP+ module transmitter 4 10 VEER Module Receiver Ground 1 11 VEER Module Receiver Ground 1 12 RD- Receiver Inverted Data Output   13 RD+ Receiver Non-Inverted Data Output   14 VEER Module Receiver Ground 1 15 VCCR Module Receiver 3.3 V Supply   16 VCCT Module Transmitter 3.3 V Supply   17 VEET Module Transmitter Ground 1 18 TD+ Transmitter Non-Inverted Data Input   19 TD- Transmitter Inverted Data Input   20 VEET Module Transmitter Ground 1 Note: The module ground pins are isolated from the module case. The pins shall be pulled up with 4.7K-10Kohms to a voltage between 3.14V and 3.46V on host board. The pin is pulled up to VCCT with a 4.7K-10KΩ resistor in the module. See SFF-8472 Rev12.2 Table 10-2. Monitoring Specification Figure 4, Memory Map   Mechanical Design Diagram Table 5- Cable Length Cable Length  L（Unit: m） Tolerant（Unit: cm） ≤1.0 +5/-0 1.0＜L≤4.5 +15/-0 4.5＜L≤14.5 +30/-0 ＞14.5 +2%/-0 Warnings Handling Precautions: This device is susceptible to damage as a result of electrostatic discharge (ESD). A static free environment is highly recommended. Follow guidelines according to proper ESD procedures. Laser Safety: Radiation emitted by laser devices can be dangerous to human eyes. Avoid eye exposure to direct or indirect radiation.