Low Power RS485 Interface Transceiver LTC485IS8

FEATURES                                                                                                              TYPICAL APPLICATION

■ Low Power: I_CC = 300µA Typ                                                        

■ Designed for RS485 Interface Applications

■ Single 5V supply

■ –7V to 12V Bus Common Mode Range Permits

   ±7V Ground Difference Between Devices on the Bus

■ 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

■ Combined Impedance of a Driver Output and

   Receiver Allows Up to 32 Transceivers on the Bus

■ 70mV Typical Input Hysteresis

■ 30ns Typical Driver Propagation Delays

   with 5ns Skew

■ Pin Compatible with ±60V Protected LT1785 and                          

   52Mbps LTC1685

APPLICATIONS

■ Low Power RS485/RS422 Transceiver

■ Level Translator

DESCRIPTION

The LTC® 485 is a low power differential bus/line trans-

ceiver designed for multipoint data transmission standard

RS485 applications with extended common mode range

(12V to –7V). It also meets the requirements of RS422.

                                                                                                              PACKAGE/ORDER INFORMATION

The CMOS design offers significant power savings over its

bipolar counterpart without sacrificing ruggedness against                  

overload of ESD damage.

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.

The LTC485 is fully specified over the commercial and

extended industrial temperature range.