Datasheet

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________________General Description
The MAX3471 half-duplex transceiver is intended for
lithium battery-powered RS-485/RS-422 applications. It
draws only 1.6µA (typical) supply current from a 3.6V
supply with the receiver enabled and the driver dis-
abled. Its wide 2.5V to 5.5V supply voltage guarantees
operation over the lifetime of a lithium battery.
This device features true fail-safe operation that guar-
antees a logic-high receiver output when the receiver
inputs are open or shorted. This means that the receiv-
er output will be a logic high if all transmitters on a ter-
minated bus are disabled (high impedance). The
MAX3471 has a 1/8-unit load input resistance. When
driver outputs are enabled and pulled above V
CC
or
below GND, internal circuitry prevents battery back-
charging.
The MAX3471 is available in an 8-pin µMAX package.
________________________Applications
Remote Meter Reading
Battery-Powered Differential Communications
Level Translators
____________________________Features
♦ 1.6µA Supply Current with Receiver Enabled
♦ +2.5V to +5.5V Single-Supply Operation
♦ True Fail-Safe Receiver Input
♦ Available in µMAX Package
♦ 1/8-Unit-Load Receiver Input
♦ -7V to +10V Common-Mode Input Voltage Range
MAX3471
1.6µA, RS-485/RS-422, Half-Duplex,
Differential Transceiver for Battery-Powered Systems
________________________________________________________________ Maxim Integrated Products 1
1
2
3
4
8
7
6
5
V
CC
B
A
GNDDI
DE
RE
RO
MAX3471
µMAX
TOP VIEW
___________________Pin Configuration
MAX3471
B
A
B
A
R
DI
V
CC
V
CC
GND
GND
REMOTE UNIT
DE
RO
D
RE
R
DE
DI
RO
D
RE
R
DI DE
D
BA
RERO
TYPICAL HALF-DUPLEX RS-485 NETWORK
R
DI DE
D
BA
RERO
V
CC
GND
V
CC
V
CC
0.1µF
CENTRAL UNIT
REMOTE UNIT
REMOTE UNIT
19-0497; Rev 0; 2/98
PART
MAX3471CUA
MAX3471EUA -40°C to +85°C
0°C to +70°C
TEMP. RANGE PIN-PACKAGE
8 µMAX
8 µMAX
_______________Ordering Information
Typical Application Circuit