特点
Low Power: Icc = 120μA Max with Driver Disabled
ICC = 500μA Max with Driver Enabled, No Load
1μA Quiescent Current in Shutdown Mode
Controlled Slew Rate Driver for Reduced EMI
Single 5V Supply
Drivers/Receivers Have ±10kV ESD Protection
-7V to 12V Common-Mode Range Permits ±7V Ground Difference Between Devices on the Data Line
Thermal Shutdown Protection
Power Up/Down Glitch-Free Driver Outputs Permit Live Insertion or Removal of Transceiver
Driver Maintains High Impedance in Three-State or with the Power Off
Up to 32 Transceivers on the Bus
Pin Compatible with the LTC485
典型应用
典型应用
描述
描述 The LTC?1483 is an ultra-low power differential line transceiver designed for data transmission standard RS485 applications with extended common-mode range (- 7V to 12V). It will also meet the requirements of RS422. The LTC1483 features output drivers with controlled slew rate, decreasing the EMI radiated from the RS485 lines, and improving signal fidelity with misterminated lines. The CMOS design offers significant power savings over its bipolar counterparts without sacrificing ruggedness against overload or ESD damage. Typical quiescent current is only 80μA while operating and less than 1mA in shutdown. The driver and receiver feature three-state outputs, with the driver outputs maintaining high impedance over the entire common-mode range. Excessive power dissipation caused by bus contention or faults is prevented by a thermal shutdown circuit which forces the driver outputs into a high impedance state. The receiver has a fail-safe feature which guarantees a high output state when the inputs are left open. I/O pins are protected against multiple ESD strikes of over ±10kV. The LTC1483 is fully specified over the commercial and extended industrial temperature range and is available in 8-pin DIP and SO packages.