特点
Low Power: I
CC
= 300μA Typical
Designed for RS485 or RS422 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 Package
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
28ns Typical Driver Propagation Delays with 5ns Skew for 2.5MB Operation
Pin Compatible with the SN75180
Available in 14-Lead PDIP and SO Packages
典型应用
描述
The LTC?491 is a low power differential bus/line transceiver designed for multipoint data transmission standard RS485 applications with extended common mode range (12V to –7V). It also meets the requirements of RS422.
The CMOS design offers significant power savings over its bipolar counterpart without sacrificing ruggedness against overload or 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.
Both AC and DC specifications are guaranteed from 0°C to 70°C and 4.75V to 5.25V supply voltage range.