LTC1485IS8#TRPBF UART Interface IC RS-232 Interface IC 1x 5V RS232/RS485 Multiprotocol Tran
uart multiplexer ic
,uart level shifter ic
LTC1485IS8#TRPBF UART Interface IC RS-232 Interface IC 1x 5V RS232/RS485 Multiprotocol Tran
FEATURES
n ESD Protection Over ±10kV
n Low Power: ICC = 1.8mA Typ
n 28ns Typical Driver Propagation Delays with 4ns Skew
n Designed for RS485 or RS422 Applications
n Single 5V Supply
n −7V to 12V Bus Common-Mode Range Permits ±7V Ground Difference Between Devices on the Bus n Thermal Shutdown Protection
n Power-Up/Down Glitch-Free Driver Outputs
n Driver Maintains High Impedance in Three-State or with the Power Off
n Combined Impedance of a Driver Output and Receiver Allows up to 32 Transceivers on the Bus n 60mV Typical Input Hysteresis
n Pin-Compatible with the SN75176A, DS75176A, and SN75LBC176
APPLICATIONS
n Low Power RS485/RS422 Transceiver
n Level Translator
DESCRIPTION
The LTC®1485 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.
The CMOS with Schottky 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 dissipa- tion caused by bus contention or faults is prevented by a thermal shutdown circuit which forces the driver outputs into a high impedance state. I/O pins are protected against multiple ESD strikes of over ±10kV.
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 –40°C to 85°C and 4.75V to 5.25V supply voltage range.
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