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FM712 Datasheet(PDF) 3 Page - FutureWafer Tech Co.,Ltd |
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FM712 Datasheet(HTML) 3 Page - FutureWafer Tech Co.,Ltd |
3 / 5 page Applications information Figure 3 Power derating Curve Figure 4 Capacitance vs.Reverse voltage Device connection for protectoion of two RS485 data lines EIA RS-485 specifies a +-7v ground difference between devices on the bus.This permits the bus voltage to range from +12v to -7v. The FM712 is designed to protect two RS485 data line in extended common mode applications. The FM712 may be used to protect devices from transient voltage resulting from ESD,EFT,and lightning. The device is designed with asymmetrical operating voltages for optimum protection. The tvs diodes at pins 1 and 2 have a working voltage of 12 volts.These pins are connected to the differential data line pairs. The tvs diodes at pin 3 have a working voltage of 7 volts. Pin 3 is connected to ground. The internal tvs diodes of the FM712 will protect the transceiver input from positive transient voltage spikes greater than 12v and negative spikes greater than 7v. A series current limiting resistor may be added in applications requiring enhanced surge immunity. E1506F3C-STD-FW-003 For extended common-mode RS-485 FM712 Futurewafer Tech Co., Ltd |
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