LTC1482

Supply Voltage (VCC)................................................ 6.5V
Control Input Voltages .................  0.3V to (VCC + 0.3V)
Carrier Detect Voltage .................................  0.3V to 8V
Driver Input Voltage .....................  0.3V to (VCC + 0.3V)
Driver Output Voltages .................................  7V to 10V
Receiver Input Voltages (Driver Disabled) .. 12V to 14V
Receiver Output Voltage ...............  0.3V to (VCC + 0.3V)
Junction Temperature .......................................... 125°C
Operating Temperature Range
LTC1482C ............................................. 0°C £ TA £ 70°C
LTC1482I.......................................... 40°C £ TA £ 85°C
Storage Temperature Range ................ 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................... 300°C


Description

The LTC®1482 is a low power RS485 compatible transceiver that offers an active low carrier detect output. The open-drain carrier detect pin allows several transceivers to share the same carrier detect line and can be used to detect the insertion or removal of a driven RS485/RS422 cable. 

Enhanced ESD protection allows the LTC1482 to withstand ±15kV (human body model), IEC-1000-4-2 level 4 (±8kV) contact and level 3 (±8kV) air discharge ESD without latchup or damage. 

The LTC1482 receiver stays alive at all times except in shutdown. The supply current is a maximum of 700mA and 900mA when the driver is disabled and enabled respectively. In shutdown, the quiescent current of the LTC1482 drops to a maximum of 20mA. 

When the driver is disabled or the LTC1482 is in shutdown, the driver outputs are three-stated and remain in a high impedance state over the RS485 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.