General Description

The MAX3140 is a complete universal asynchronous receiver-transmitter (UART) and a true fail-safe RS-485/RS-422 transceiver combined in a single 28-pin QSOP package for space-, cost-, and power-constrained applications. The MAX3140 saves additional board space as well as microcontroller (µC) I/O pins by featuring an SPI™/QSPI™/MICROWIRE™-compatible serial interface. It is pin-programmable for configuration in all RS-485/RS-422 networks.

Features

♦ Integrated UART and RS-485/RS-422 Transceiver in a Single 28-Pin QSOP

♦ SPI/MICROWIRE-Compatible Interface Saves µC I/O Pins

♦ True Fail-Safe Receiver Output Eliminates Complex Network Termination

♦ Pin-Programmable RS-485/RS-422 Features

Half/Full-Duplex Operation

Slew-Rate Limiting for Reduced EMI

115kbps/500kbps/10Mbps Data Rates

Receiver/Transmitter Phase for Twisted-Pair Polarity Reversal

♦ Full-Featured UART

Programmable Up to 230k baud with a 3.6864MHz Crystal

8-Word Receive FIFO Minimizes Processor

Overhead 9-Bit Address-Recognition Interrupt

♦ Allows Up to 256 Transceivers on the Bus

♦ Low 20µA Hardware Shutdown Mode

♦ Hardware/Software-Compatible with MAX3100 and MAX3089

Applications

Industrial-Control

Transceivers for EMI

Local Area Networks

Sensitive Applications

HVAC and Building

Control Embedded Systems

Point-of-Sale Devices

Intelligent Instrumentation