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