ANALOG DEVICES LTC2871CUHF#PBF RS232/RS485 Transceiver, 20Mbps, Open, Short, 3 to 5.5V, 0°C to 70°C, QFN-38

LTC2871CUHF#PBF is a RS232/RS485 multiprotocol transceiver with integrated termination. It can be configured as two RS232 single ended transceivers or one RS485 differential transceiver on shared I/O lines. It offers independent control of two RS232 transceivers and one RS485 transceiver, each on dedicated I/O lines. Pin-controlled integrated termination resistors allow for easy interface reconfiguration, eliminating external resistors and control relays. Half-duplex switches allow four-wire and two-wire RS485 configurations. Loopback mode steers the driver inputs to the receiver outputs for diagnostic self-test. The RS485 receivers support up to 256 nodes per bus and feature full failsafe operation for floating, shorted or terminated inputs. It is used in applications such as software selectable RS232/RS485/RS422 interface, point-of-sale terminals, cable repeaters, protocol translators.

• Supply voltage range from 3V to 5.5V, supports upto 256 RS485 nodes
• Logic loopback mode, 1.7V to 5.5V logic interface
• RS485 receiver failsafe eliminates UART lockup
• VCC supply current in shutdown mode is 8µA typical at (TA = 25°C)
• Input current (RS485 receiver) is 125µA maximum at (VIN = 12V or -7V, VCC = 0V or 3.3V)
• Input resistance (RS485 receiver) is 125Kohm typical at (VIN = 12V or -7V, VCC = 0V or 3.3V)
• Input hysteresis is 220mV typical at (TA = 25°C. VCC = VL = 3.3V)
• Maximum data rate (RS485) is 20Mbps minimum at (TA = 25°C. VCC = VL = 3.3V)
• Driver propagation delay (RS485) is 20ns typical at (RDIFF = 54 ohm, CL = 100pF)
• Operating temperature range from 0°C to 70°C, 38-lead plastic QFN

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party