Product Features:
l Supports 25.78Gb/s aggregate bit rate;
l 1310nm DFB Laser transmitter and PIN/TIA receiver;
l Maximum link length of 20km on;
l Single Mode Fiber (SMF);
l Hot-pluggable SFP28 footprint;
l Duplex LC receptacles;
l Single +3.3V±5% power supply;
l Maximum power dissipation < 1.2W;
l Compliant with SFF-8472 & IEEE 802.3cc;
l Fully RoHS Compliant;
l Case operating temperature;
Commercial: 0°C to +70°C
Industrial: -40°C to +85°C
I. Pin Diagram
Pinout of Connector Block on Host Board
II.Pin Descriptions
Pin | Symbol | Name/Description | Ref. |
1 | V EET | Transmitter Ground (Common with Receiver Ground) | 1 |
2 | T FAULT | Transmitter Fault. | 2 |
3 | T DIS | Transmitter Disable. Laser output disabled on high or open. | 3 |
4 | SDA | 2-wire Serial Interface Data Line | 4 |
5 | SCL | 2-wire Serial Interface Clock Line | 4 |
6 | MOD_ABS | Module Absent. Grounded within the module | 4 |
7 | RS0 | No connection required | |
8 | LOS | Loss of Signal indication. Logic “0” indicates normal operation. | 5 |
9 | RS1 | No connection required | |
10 | V EER | Receiver Ground (Common with Transmitter Ground) | 1 |
11 | V EER | 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 | V EER | Receiver Ground (Common with Transmitter Ground) | 1 |
15 | V CCR | Receiver Power Supply | |
16 | V CCT | Transmitter Power Supply | |
17 | V EET | 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 | V EET | Transmitter Ground (Common with Receiver Ground) | 1 |
Notes:
1. Circuit ground is internally isolated from chassis ground.
2. TFAULT is an open collector/drain output, which is pulled up with a 4.7kΩ – 10kΩ resistor on the
host board, but is grounded inside the SFP+ cable plug.
3. Laser output disabled on TDIS >2.0V or open, enabled on TDIS <0.8V.
4. Should be pulled up with 4.7kΩ – 10kΩ on host board to a voltage between 2.0V and 3.6V.
MOD_ABS pulls line low to indicate module is plugged in.
5. LOS is open collector output. Should be pulled up with 4.7kΩ – 10kΩ on host board to a voltage
between 2.0V and 3.6V. Logic 0 indicates normal operation; logic 1 indicates loss of signal.
III. Absolute Maximum Ratings
Parameter | Symbol | Min | Type | Max | Unit | Ref. |
Maximum Supply Voltage | Vcc | -0.5 | 3.6 | V | ||
Storage Temperature | TS | -40 | 85 | ℃ | ||
Relative Humidity | RH | 0 | 85 | % |
Notes:
1.Limited by the fiber cable jacket, not the activeends.
2.Non-condensing
IV. Optical Characteristics
Parameter | Symbol | Min. | Typ. | Max. | Unit | Ref. |
Transmitter | ||||||
Signaling rate(range) | Sr | 25.7825±100ppm | GBd | |||
Center Wavelength | λc | 1260 | 1355 | nm | ||
Optical Return Loss Tolerance | 20 | nm | ||||
Average Output Power | Pavg | -4 | 2 | dBm | ||
Optical Modulation Amplitude | TxOMA | -4 | dBm | |||
Extinction Ratio | ER | 3.5 | dB | |||
Side Mode Suppression Ratio | SMSR | 30 | dB | |||
Transmitter OFF Output Power | POff | -30 | dBm | |||
Transmitter and Dispersion Penalty | TDP | 2.7 | dB | |||
Transmitter eye mask definition {X1, X2, X3, Y1, Y2, Y3} Hit ratio 5×10-5 hits per sample. | {0.31, 0.4, 0.45, 0.34, 0.38, 0.4} | |||||
Receiver | ||||||
Signaling rate(range) | Sr | 25.7825±100ppm | GBd | |||
Center Wavelength | λc | 1260 | 1355 | nm | ||
Receiver Sensitivity(OMA) | SOMA | -12 | dBm | 1 | ||
Receiver Reflectance | Rfl | -26 | dBm | |||
Loss of Signal Assert | PA | -30 | dBm | |||
Loss of Signal De-assert | PD | -17 | dBm | |||
LOS Hysteresis | PD- PA | 0.5 | dB | |||
Note:
1. 1. Measured at 25.78125Gb/s, ER>3.5dBm, PRBS 2 31 -1 and BER better than or equal to 5x10-5.
V. Digital Diagnostic Memory Map
VI. Digital Diagnostic Monitoring Information
Parameter | Unit | Accuracy |
Case Temperature | ℃ | ±3 |
Supply Voltage | V | ±3% |
Tx Bias Current | mA | ±10% |
Tx Optical Power | dB | ±3 |
Rx Optical Power | dB | ±3 |
VII. Electrical Interface Characteristics
Parameter | Symbol | Min | Type | Max | Unit | Ref. |
Supply Voltage | Vcc | 3.135 | 3.3 | 3.465 | V | |
Supply Current | Icc | 300 | mA | Commercial | ||
350 | mA | Industrial | ||||
Transmitter | ||||||
Input differential impedance | Rin | 100 | Ω | 1 | ||
Single-ended Data Input Swing | Vin | 90 | 450 | mVp-p p | ||
Transmit Disable Voltage | VD | 2 | VCCHOST | V | ||
Transmit Enable Voltage | VEN | Vee | Vee+0.8 | V | ||
Transmit Fault Assert Voltage | V FA | 2 | VCCHOST | V | ||
Transmit Fault De-Assert Voltage | V FDA | Vee | Vee+0.4 | V | ||
Receiver | ||||||
Single-ended Data Output Swing | Vout | 200 | 450 | mVp-p
| 2 | |
LOS Fault | VLOS_fault | 2 | VccHOST | V | 3 | |
LOS Normal | VLOS_norm | Vee | Vee+0.4 | V | 3 | |
Notes:
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. Maximum pull-up voltage is 5.5V.
VIII. Recommended Interface Circuit
IX. Mechanical Dimensions (mm)
SFP wire mechanical drawing (Unit: mm)
Product Features
l Supports 25.78Gb/s aggregate bit rate
l 1310nm DFB Laser transmitter and PIN/TIA receiver
l Maximum link length of 20km on
l Single Mode Fiber (SMF)
l Hot-pluggable SFP28 footprint
l Duplex LC receptacles
l Single +3.3V±5% power supply
l Maximum power dissipation < 1.2W
l Compliant with SFF-8472 & IEEE 802.3cc
l Fully RoHS Compliant
l Case operating temperature
Commercial: 0°C to +70°C
Industrial: -40°C to +85°C
Applications | Compliance |
Data Center Backbone | SFP28 MSA. |
Ethernet Switches | IEEE802.3cc |
High-speed Servers | SFF-8431 |
High-performance Computing Clusters | SFF-8432 |
Ordering Information
Package | Product part NO. | Distance | Temperature Range |
FSJMLB31-K20C | 25.78125 | 1310 | 20km |
FSJMLB31-K20I | 25.78125 | 1310 | 20km |
*For availability of additional cable lengths, please contact Fibridge. | |||