LTC1482 Datasheet | Linear Technology

LTC1482 Low Power RS485 Transceiver with Carrier Detect and Receiver Fail-Safe DESCRIPTIO The LTC®1482 is a low power RS485 patible 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 ±15k V (human body model), IEC-1000-4-2 level 4 (± 8k V) contact and level 3 (± 8k V) 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 700µA and 900µA when the driver is disabled and enabled respectively. In shutdown, the quiescent current of the LTC1482 drops to a maximum of 20µA. 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 mon 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 LTC1482 is fully specified over the mercial and industrial temperature ranges and is available in 8-lead MSOP, PDIP and SO packages. Features s s s s s s s s s s s s s No Damage or Latchup to ±15k V (Human Body Model), IEC1000-4-2 Level 4 (±8k V) Contact and Level 3 (±8k V) Air Discharge Active Low Carrier Detect Output Guaranteed High Receiver Output State for Floating, Shorted or Terminated Inputs with No Signal Present Drives Low Cost Residential Telephone Wires Low Power: ICC = 700µA Max with Driver Disabled ICC = 900µA Max in Driver Mode Without Load 20µA Max Quiescent Current in Shutdown Mode Single 5V Supply - 7V to 12V mon Mode Range Permits ± 7V Ground Difference Between Devices on the Data Line Maximum Data Rate of 4Mbps Power Up/Down Glitch-Free Driver Outputs Up to 32 Transceivers on the Bus Available in 8-Lead MSOP,...