Features

• Very Low Power: I_CC = 110μA Typ
• Designed for RS485 or RS422 Applications
• Single 5V Supply
• –7V to 12V Bus Common Mode Range Permits ±7V GND Difference Between Devices on the Bus
• Thermal Shutdown Protection
• Power-Up/Down Glitch-Free Driver Outputs Permit Live Insertion/Removal of Package
• Driver Maintains High Impedance in Three-State or with the Power Off
• 28ns Typical Driver Propagation Delays with 5ns Skew
• Pin Compatible with the SN75174, DS96174, μA96174, and DS96F174

Typical Application

Description

The LTC®487 is a low power differential bus/line driver designed for multipoint data transmission standard RS485 applications with extended common mode range (– 7V to 12V). It also meets RS422 requirements.

The CMOS design offers significant power savings over its bipolar counterpart without sacrificing ruggedness against overload or ESD damage.

The driver features 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.

Both AC and DC specifications are guaranteed from 0°C to 70°C (Commercial), –40°C to 85°C (Industrial) and over the 4.75V to 5.25V supply voltage range.