Multiprotocol transceiver shrinks RS485/RS232 designs
A simple logic interface, supporting voltages as low as 1.7V, enables reconfiguration of shared bus lines as either one RS232 single-ended transceiver or one half-duplex RS485 differential transceiver. An integrated DC/DC boost controller and pin-controlled RS485 integrated termination resistor eliminate the need for external circuitry.
The LTC2873 is offered in commercial, industrial and automotive versions, supporting operating temperature ranges from 0°C to 70°C, -40°C to 85°C and -40°C to 125°C, respectively. The LTC2873 is available in a RoHS compliant 24-pin 4 x 5 mm QFN package. Pricing starts at $4.45 (1,000)
Linear Technology; www.linear.com/product/LTC2873
Features: LTC2873
3V to 5.5V supply voltage range
One RS485 & one RS232 transceiver
20 Mbps RS485 & selectable 1 Mbps or 250 kbps RS232
Automatic selection of integrated RS485 (120Ω) & RS232 (5 kΩ) termination resistors
Logic loopback mode
High ESD: ±26 kV on line I/O; ±4 kV on all other pins
1.7V to 5.5V logic interface
Supports up to 256 RS485 nodes
Full failsafe RS485 receiver eliminates UART lockup
24-pin 4 x 5 mm QFN package
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