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LT1785ACS8 Datasheet(PDF) 1 Page - Linear Technology |
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LT1785ACS8 Datasheet(HTML) 1 Page - Linear Technology |
1 / 12 page 1 LT1785/LT1785A LT1791/LT1791A 60V Fault Protected RS485/RS422 Transceivers Normal Operation Waveforms at 250kBaud GND1 GND2 RTERM 1785/91 TA01 RO1 RE1 DE1 DI1 LT1785 RO2 RE2 DE2 DI2 LT1785 VCC1 VCC2 RTERM TX TX RX RX DESCRIPTIO The LT ®1785/LT1791 are half-duplex and full-duplex dif- ferential bus transceivers for RS485 and RS422 applica- tions which feature on-chip protection from overvoltage faults on the data transmission lines. Receiver input and driver output pins can withstand voltage faults up to ±60V with respect to ground with no damage to the device. Faults may occur while the transceiver is active, shut down or powered off. Data rates to 250kbaud on networks of up to 128 nodes are supported. Controlled slew rates on the driver outputs control EMI emissions and improve data transmission integrity on improperly terminated lines. Drivers are speci- fied to operate with inexpensive cables as low as 72 Ω characteristic impedance. The LT1785A/LT1791A devices have “fail-safe” receiver inputs to guarantee a receiver output high for shorted, open or inactive data lines. On-chip ESD protection elimi- nates need for external protection devices. The LT1785/LT1785A are available in 8-lead DIP and SO packages and the LT1791/LT1791A in 14-lead DIP and SO packages. s Protected from Overvoltage Line Faults to ±60V s Pin Compatible with LTC485 and LTC491 s High Input Impedance Supports Up to 128 Nodes s No Damage or Latchup to ESD IEC-1000-4-2 Level 4: ±15kV Air Discharge IEC-1000-4-2 Level 2: ±4kV Contact Discharge s Controlled Slew Rates for EMI Emissions Control s Guaranteed High Receiver Output State for Floating, Shorted or Inactive Inputs s Outputs Assume a High Impedance When Off or Powered Down s Drives Low Cost, Low Impedance Cables s Short-Circuit Protection on All Outputs s Thermal Shutdown Protection s Industrial Control Data Networks s CAN Bus Applications s HVAC Controls 1785/91 TA02 , LTC and LT are registered trademarks of Linear Technology Corporation. FEATURES APPLICATIO S TYPICAL APPLICATIO RO Y-Z DI |
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