LTC2870IUFD#PBF

LTC2870 is a robust pin-configurable multiprotocol transceiver with integrated termination supporting RS232, RS485, and RS422 protocols. The LTC2870 can be configured as two RS232 single ended transceiver or one RS485 differential transceiver 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 receiver support up to 256 nodes per bus, and feature full failsafe operation for floating, shorted or terminated inputs. Typical applications are software selectable RS232/RS485/RS422 interface, point-of-sale terminals, cable repeaters, protocol translators.

• 3V to 5.5V supply voltage
• 20Mbps RS485 and 500kbps RS232
• Automatic selection of integrated RS485 (120 ohm) and RS232 (5kohm) termination resistors
• Half-/full-duplex RS485 switching
• High ESD is ±26kV
• Logic loopback mode
• 1.7V to 5.5V logic interface
• Supports up to 256 RS485 nodes, RS485 receiver failsafe eliminates UART lockup
• 28-lead (4mm × 5mm) plastic QFN package
• –40°C to 85°C temperature range

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