19-1259; Rev 0; 7/97
SPI/Microwire-Compatible
UART in QSOP-16
_______________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.
____________________________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
MAX3100
______________Ordering Information
PART
MAX3100CPD
MAX3100CEE
MAX3100EPD
MAX3100EEE
TEMP. RANGE
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
14 Plastic DIP
16 QSOP
14 Plastic DIP
16 QSOP
________________________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
Typical Operating Circuit appears at end of data sheet.
__________________________________________________________Pin Configurations
TOP VIEW
DIN 1
DOUT 2
SCLK 3
CS 4
IRQ 5
SHDN 6
GND 7
14 V
CC
13 TX
12 RX
DIN 1
DOUT 2
SCLK 3
CS 4
N.C. 5
IRQ 6
SHDN 7
GND 8
16 V
CC
15 TX
14 RX
MAX3100
11 RTS
10 CTS
9
8
X1
X2
MAX3100
13 RTS
12 N.C.
11 CTS
10 X1
9
X2
DIP
QSOP
SPI is a trademark of Motorola, Inc. Microwire is a trademark of National Semiconductor Corp.
________________________________________________________________
Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
