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General Description
The MAX3110E/MAX3111E combine a full-featured uni-
versal asynchronous receiver/transmitter (UART) with
±15kV ESD-protected RS-232 transceivers and inte-
grated charge-pump capacitors into a single 28-pin
package for use in space-, cost-, and power-con-
strained applications. The MAX3110E/MAX3111E also
feature an SPI™/QSPI™/MICROWIRE™-compatible
serial interface to save additional board space and
microcontroller (µC) I/O pins.
A proprietary low-dropout output stage enables the
2-driver/2-receiver interface to deliver true RS-232 per-
formance down to V
CC
= +3V (+4.5V for MAX3110E)
while consuming only 600µA. The receivers remain
active in a hardware/software-invoked shutdown, allow-
ing external devices to be monitored while consuming
only 10µA. Each device is guaranteed to operate at up
to 230kbps while maintaining true EIA/TIA-232 output
voltage levels.
The MAX3110E/MAX3111E’s UART includes a crystal
oscillator and baud-rate generator with software-pro-
grammable divider ratios for all common baud rates
from 300baud to 230kbaud. The UART features an 8-
word-deep receive FIFO that minimizes processor over-
head and provides a flexible interrupt with four
maskable sources. Two control lines (one input and
one output) are included for hardware handshaking.
The UART and RS-232 functions can be used together
or independently since the two functions share only
supply and ground connections (the MAX3110E/
MAX3111E are hardware- and software-compatible
with the MAX3100 and MAX3222E).
________________________Applications
Point-of-Sale (POS) Devices
Handy-Terminals
Telecom/Networking Diagnostic Ports
Industrial Front-Panel Interfaces
Hand-Held/Battery-Powered Equipment
Features
♦ Integrated RS-232 Transceiver and UART in a
Single 28-Pin Package
♦ SPI/QSPI/MICROWIRE-Compatible µC Interface
♦ Internal Charge-Pump Capacitors—
No External Components Required!
♦ True RS-232 Operation Down to V
CC
= +3V
(MAX3111E)
♦ ESD Protection for RS-232 I/O Pins
±15kV—Human Body Model
±8kV—IEC 1000-4-2, Contact Discharge
±15kV—IEC 1000-4-2, Air-Gap Discharge
♦ Single-Supply Operation
+5V (MAX3110E)
+3.3V (MAX3111E)
♦ Low Power
600µA Supply Current
10µA Shutdown Supply Current with
Receiver Interrupt Active
♦ Guaranteed 230kbps Data Rate
♦ Hardware/Software-Compatible with MAX3100
and MAX3222E
MAX3110E/MAX3111E
†
SPI/MICROWIRE-Compatible UART and ±15kV ESD-
Protected RS-232 Transceivers with Internal Capacitors
________________________________________________________________
Maxim Integrated Products
1
19-1494; Rev 0; 7/99
Typical Application Circuit
Ordering Information
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
Ordering Information continued at end of data sheet.
Pin Configuration appears at end of data sheet.
†
Covered by U.S. Patent numbers 4,636,930; 4,679,134;
4,777,577; 4,797,899; 4,809,152; 4,897,774; 4,999,761; and
other patents pending.
PART
MAX3110ECWI
MAX3110ECNI 0°C to +70°C
0°C to +70°C
TEMP.
RANGE
PIN-
PACKAGE
28 Wide SO
28 Plastic DIP
V
CC
(V)
5
5
