SFP-1.25G-LX 1.25Gbps SFP Optical Transceiver, …

1 1 of 8 VER / 090618 SFP Optical transceiver , 10km Reach 1 Feature 1310nm FP laser and PIN photo detector Meet SFP MSA and SFF-8472 with LC receptacle Digital diagnostic monitoring 10km transmission with SMF Hot-pluggable Metal enclosure for lower EMI + Single power supply Qualified to meet the intent of Bellcore reliability practices LVPECL logic interface simplifies interface to external circuitry LVTTL logic level RX LOS With pull de-latch With 9/125 m single mode fiber (SMF) Operate data.

2 Operate temperature Standard :0 to +70 C Extended : -20 to +85 C industrial : -40 to +85 C Complies with RoHS directive 2 Application ATM SONET Fiber Channel Gigabit Ethernet Switches Routers Hubs 3 General The Optical transceiver is compliant with the Small Form-Factor Pluggable (SFP) Multi-Source Agreement (MSA) and SFF-8472. It offers previously unavailable system cost, upgrade, and reliability benefits by virtue of being hot-pluggable. The Optical transceiver is ROHS compliant; each of the components is lead-free.

3 2 of SFP Optical transceiver , 10km Reach The Optical transceiver contains an EEPROM. It provides access to sophisticated identification information that describes the transceiver s capabilities, standard interfaces, manufacturer, and other information. The serial interface uses the 2-wire serial CMOS EEPROM protocol defined for the ATMEL AT24C01A/02/04 family of components. The transceivers are compatible with SFP Multi-Source Agreement (MSA) and SFF-8472.

4 For further information, please refer to SFP MSA. PIN Post AmpLD DriverLD TD+/-TxFaultRD+/-LOSTxDisA/D convertor EEPROM Memory Digital Diagnostic Monitoring InterfaceTe m p VccSDASCL2 wire address 1010000X (A0h)2 wire address 1010001X (A2h)Alarm and Warning Thresholds (56 bytes) Cal Constants (40 bytes) Real Time Diagnostic Interface (24 bytes) Vendor Specific (8 bytes) Serial ID Defined by SFP MSA (96 bytes) Vendor Specific (32 bytes) 09512705595119127 User Writable EEPROM (120 bytes) Vendor Specific (8 bytes) 247255 Reserved (128 bytes)

5 255 3 of SFP Optical transceiver , 10km Reach 4 Performance Specifications Absolute Maximum Ratings Parameter Symbol Min. Max. Unit Note Storage Temperature Tst -40 +85 C - Input Voltage - GND Vcc V - Power Supply Voltage Vcc-Vee + V - Recommended Operating Conditions PSymbol Min Typical Max Unit Operating Case Temperature Standard Tc 0 +70 C -20+85 industrial -40 +85 C Power Supply Voltage Vcc V Power Supply Current Icc 300 mA Data Rate Gbps 4

6 Of SFP Optical transceiver , 10km Reach Optical and Electrical Characteristics Parameter SymbolMin Typical Max Unit Notes Transmitter Centre Wavelength c 1260 1310 1360 nm Spectral Width (RMS) nm Average Output Power Pout -8 -2 dBm 1 Extinction Ratio ER 9 dB Optical Rise/Fall Time (20%~80%) tr/tf ns Data Input Swing Differential VIN400 1800 mV 2 Input Differential Impedance ZIN90 100 110 TX Disable Disable Vcc V Enable 0 V TX Fault Fault Vcc V Normal 0 V Receiver Centre Wavelength c 1100 1600 nm Receiver Sensitivity -24 dBm 3 Receiver Overload 0 dBm 3 LOS De-Assert LOSD -27 dBm LOS Assert LOSA -30 dBm LOS Hysteresis 1 4 dB Data Output Swing Differential Vout 400 1800 mV 4 LOS High Vcc V Low V Notes: 1.

7 The Optical power is launched into SMF. 2. PECL input, internally AC-coupled and terminated. 3. Measured with a PRBS 27-1 test pattern @1250 Mbps, BER 1 10-12. 4. Internally AC-coupled. 5 of SFP Optical transceiver , 10km Reach 5 Pin Definitions Pin Diagram Pin Descriptions Pin# Name Function Notes 1 VeeT Transmitter Ground - 2 TX Fault Transmitter Fault Indication Note 1 3 TX Disable Transmitter Disable Note 2, Module disables on high or open 4 MOD-DEF2 Module Definition 2 Note 3.

8 2 wire serial ID interface 5 MOD-DEF1 Module Definition 1 Note 3, 2 wire serial ID interface 6 MOD-DEF0 Module Definition 0 Note 3, Grounded in Module 7 Rate Select Not Use - 8 LOS Loss of Signal Note 4 9 VeeR Receiver Ground Note 5 10 VeeR Receiver Ground Note 5 11 VeeR Receiver Ground Note 5 12 RD- Inv. Received Data Out Note 6 13 RD+ Received Data Out Note 6 Tx DisableVeeT VeeTVeeT VccR VccT VeeR VeeRVeeRVeeR TD+TD-RD-RD+ MOD-DEF(2)MOD-DEF(1)MOD-DEF(0)Rate SelectLOSTx Fault2018191716131514121113245867910 Bottom of Board (as viewed thru top of board)

9 Top of Board 6 of SFP Optical transceiver , 10km Reach Pin# Name Function Notes 14 VeeR Receiver Ground Note 5 15 VccR Receiver Power Note 7, 5% 16 VccT Transmitter Power Note 7, 5% 17 VeeT Transmitter Ground Note 5 18 TD+ Transmit Data In Note 8 19 TD- Inv. Transmit Data In Note 8 20 VeeT Transmitter Ground Note 5 Notes: 1. TX Fault is an open collector/drain output, which should be pulled up with a 10K resistor on the host board.

10 Pull up voltage between and VccT, R+ When high, output indicates a laser fault of some kind. Low indicates normal operation. In the low state, the output will be pulled to < 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 10 K resistor. Its states are: Low (0 ): Transmitter on (> , < ): Undefined High ( ): Transmitter Disabled Open: Transmitter Disabled 3. Mod-Def 0,1,2. These are the module definition pins.