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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 com-

pact 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.

The MAX3100 includes a crystal oscillator and a baud-

rate generator with software-programmable divider ratios

for all common baud rates from 300 baud to 230k baud.

A software- or hardware-invoked shutdown lowers quies-

cent current to 10µA, while allowing the MAX3100 to

detect receiver activity.

An 8-word-deep first-in/first-out (FIFO) buffer minimizes

processor overhead. This device also includes a flexible

interrupt with four maskable sources, including address

recognition on 9-bit networks. Two hardware-handshak-

ing control lines are included (one input and one output).

The MAX3100 is available in 14-pin plastic DIP and small,

16-pin QSOP packages in the commercial and extended

temperature ranges.

________________________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

____________________________Features

o 16-Pin QSOP Package (8-pin SO footprint):

Smallest UART Available

o 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

o SPI/Microwire-Compatible µC Interface

o Lowest Power:

—150µA Operating Current at 3.3V

—10µA in Shutdown with Receive Interrupt

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

o Schmitt-Trigger Inputs for Opto-Couplers

o TX and RTS Outputs Sink 25mA for Opto-Couplers

SPI/Microwire-Compatible

UART in QSOP-16

________________________________________________________________

Maxim Integrated Products

1

14

13

12

11

10

9

8

1

2

3

4

5

6

7

TX

RX

RTS

CS

SCLK

DOUT

DIN

TOP VIEW

MAX3100

CTS

X1

X2

GND

SHDN

IRQ

DIP

16

15

14

13

12

11

10

9

1

2

3

4

5

6

7

8

TX

RX

RTS

N.C.

CTS

X1

X2

DIN

DOUT

SCLK

CS

N.C.

IRQ

SHDN

GND

MAX3100

QSOP

__________________________________________________________Pin Configurations

19-1259; Rev 0; 7/97

PART

MAX3100CPD

MAX3100CEE

0°C to +70°C

0°C to +70°C

TEMP. RANGE

PIN-PACKAGE

14 Plastic DIP

16 QSOP

______________Ordering Information

Typical Operating Circuit appears at end of data sheet.

SPI is a trademark of Motorola, Inc. Microwire is a trademark of National Semiconductor Corp.

MAX3100EPD

MAX3100EEE

-40°C to +85°C

-40°C to +85°C

14 Plastic DIP

16 QSOP