(Hong Kong)
Product Summary
The LTC491IS 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 LTC491IS 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 applications of the LTC491IS are (1)low power RS485/RS422 receivers; (2)level translator.
Parametrics
LTC491IS absolute maximum ratings: (1)Supply Voltage (VCC): 12V; (2)Driver Input Currents: –25mA to 25mA; (3)Driver Input Voltages: –0.5V to VCC +0.5V; (4)Driver Output Voltages: ±14V; (5)Receiver Input Voltages: ±14V; (6)Receiver Output Voltages: –0.5V to VCC +0.5V; (7)Operating Temperature Range: 0°C to 70°C; (8)Storage Temperature Range: –65°C to 150°C; (9)Lead Temperature (Soldering, 10 sec): 300°C.
Features
LTC491IS features: (1)Low Power: ICC = 300μA Typical; (2)Designed for RS485 or RS422 Applications; (3)Single +5V Supply; (4)–7V to +12V Bus CommoMode Range Permits ±7V Ground Difference BetweeDevices othe Bus; (5)Thermal ShutdowProtection; (6)Power-Up/DowGlitch-Free Driver Outputs Permit Live Insertioor Removal of Package; (7)Driver Maintains High Impedance iThree-State or with the Power Off; (8)Combined Impedance of a Driver Output and Receiver Allows up to 32 Transceivers othe Bus; (9)70mV Typical Input Hysteresis; (10)28ns Typical Driver PropagatioDelays with 5ns Skew; (11)PiCompatible with the SN75180.
Diagrams
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 LTC491IS |
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IC TXRX RS485 LOWPWR DIFF 14SOIC |
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LTC491IS#PBF |
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IC TXRX RS485 LOW POWER 14-SOIC |
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LTC491IS#TR |
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IC TXRX RS485 LOW POWER 14-SOIC |
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LTC491IS#TRPBF |
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IC TXRX RS485 LOW POWER 14-SOIC |
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