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General Description

The MAX3100 universal asynchronous receiver transmit ter (UART) is the first UART specifically optimized for small microcontroller-based systems. Using an SPI?/Microwire? interface for communication with the host microcontroller (μC), the MAX3100 comes in a compact 16-pin QSOP. The asynchronous I/O is suitable for use in RS-232, RS-485, IR, and opto-isolated data links. IR-link communication is easy with the MAX3100’s infrared data association (IrDA) timing mode.

Features

?16-Pin QSOP Package (8-pin SO footprint): Smallest UART Available

?Full-Featured UART:

—IrDA SIR Timing Compatible

—8-Word FIFO Minimizes Processor Overhead at High Data Rates

—Up to 230k Baud with a 3.6864MHz Crystal

—9-Bit Address-Recognition Interrupt

—Receive Activity Interrupt in Shutdown

?SPI/Microwire-Compatible μC Interface

?Lowest Power:

—150μA Operating Current at 3.3V

—10μA in Shutdown with Receive Interrupt

?+2.7V to +5.5V Supply Voltage in Operating Mode

?Schmitt-Trigger Inputs for Opto-Couplers

?TX and RTSOutputs Sink 25mA for Opto-Couplers

Applications

Hand-Held Instruments

Intelligent Instrumentation

UART in SPI Systems

Small Networks in HVAC or Building Control

Isolated RS-232/RS-485: Directly Drives Opto-Couplers

Low-Cost IR Data Links for Computers/Peripherals