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LTC1485CN8
LTC1485 Differential Bus Transceiver U DESCRIPTIO FEATURES s s s s s s s s s s s s ESD Protection over ±10kV Low Power: ICC = 1.8mA Typ 28ns Typical Driver Propagation Delays with 4ns Skew 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 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 60mV Typical Input Hysteresis Pin Compatible with the SN75176A, DS75176A, and SN75LBC176 s 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. 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. S Low Power RS485/RS422 Transceiver Level Translator , LTC and LT are registered trademarks of Linear Technology Corporation. UO s The CMOS with Schottky design offers significant power savings over its bipolar counterpart without sacrificing ruggedness against overload or ESD damage. Both AC and DC specifications are guaranteed from – 40°C to 85°C and 4.75V to 5.25V supply voltage range. UO APPLICATI The LTC ®1485 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. TYPICAL APPLICATI DE 5V 5V 3 8 8 LTC1485 LTC1485 6 6 DI 4 120Ω DRIVER 7 RO 1 120Ω 4000 FT 24 GAUGE TWISTED PAIR DRIVER RE RECEIVER 5 4 DI 7 RECEIVER 2 DE 3 5 1 RO 2 RE 1485 TA01 1
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