LTC2872

Features n n n n n n n n n n n Four RS232 and Two RS485 Transceivers 3V to 5.5V Supply Voltage 20Mbps RS485 and 500kbps RS232 Automatic Selection of Integrated RS485 (120Ω) and RS232 (5kΩ) Termination Resistors Half-/Full-Duplex RS485 Switching Logic Loopback Mode High ESD: ±16kV on Line I/O 1.7V to 5.5V Logic Interface Supports Up to 256 RS485 Nodes RS485 Receiver Full Failsafe Eliminates UART Lockup Available in 38-Pin 5mm × 7mm QFN Package Flexible RS232/RS485/RS422 Interface Software Selectable Multiprotocol Interface Ports Point-of-Sale Terminals Cable Repeaters Protocol Translators PROFIBUS-DP Networks LTC2872 RS232/RS485 Dual Multiprotocol Transceiver with Integrated Termination Description The LTC®2872 is a robust pin-configurable transceiver that supports RS232, RS485, and RS422 standards while operating on a single 3V to 5.5V supply. The LTC2872 can be configured as four RS232 single-ended transceivers or two RS485 differential transceivers, or combinations of both, on shared 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. An integrated DC/DC boost converter...