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LTC2802 Datasheet(PDF) 1 Page - Analog Devices |
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LTC2802 Datasheet(HTML) 1 Page - Analog Devices |
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1 / 32 page  LTC2873 1 REV B For more information www.analog.com Document Feedback TYPICAL APPLICATION FEATURES DESCRIPTION Single-Bus RS485/RS232 Multiprotocol Transceiver with Switchable Termination The LTC®2873 is a robust pin-configurable multiprotocol transceiver that supports RS232, RS485, and RS422 protocols while operating on a single 3V to 5.5V supply. The LTC2873 can be configured as a half-duplex RS485 transceiver or as an RS232 transceiver using the same two bus pins. A pin-controlled integrated termination resistor allows for easy interface reconfiguration, eliminating external resis- tors and control relays. Loopback mode steers the driver inputs to the receiver outputs for diagnostic self-test. The RS485 receiver supports up to 256 nodes per bus, and features full failsafe operation for floating, shorted or terminated inputs. An integrated DC/DC boost converter uses a tiny 2mm × 1.6mm inductor and one capacitor, eliminating the need for multiple supplies when driving RS232 levels. APPLICATIONS n One RS485 or One RS232 Transceiver n 3V to 5.5V Supply Voltage n Up to 20Mbps RS485 n Slew-Controlled RS232 Operation: n Selectable 1Mbps or 250kbps n Automatic Selection of Integrated RS485 (120Ω) and RS232 (5kΩ) Termination Resistors n High ESD: ±26kV HBM n Logic Loopback Mode n 1.7V to 5.5V Logic Interface n Supports Up to 256 RS485 Nodes n RS485 Receiver Failsafe Eliminates UART Lockup n H-Grade Available (–40°C to 125°C) n Available in 24-Pin 4mm × 5mm QFN Package n Software Selectable RS232/RS485/RS422 Interface n Industrial Sensors and Actuators n Alarm Systems n Traffic Control and Monitoring n Highway Signs and Jumbo Displays All registered trademarks and trademarks are the property of their respective owners. 2873 TA01 120 5k 1F 1F 1F 1.7V TO VCC 3V TO 5.5V 220nF 10H 2.2F VL CAP SW SHDN DI RO 485/232 485/232 D/R (485) RE485 TE485 DE485/ F232 LB GND RS232 RS485 A/DO B/RI VDD VEE VCC DATA IN DATA OUT LTC2873 RS232 (485/232 LOW) RS485 (485/232 HIGH) RS485/RS232 Mode Switching RS232 RS485 1µs/DIV DI 485/232 5V/DIV A/DO 3V/DIV B/RI 2873 TA01b |
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