MAX3471EUA Datasheet, PDF (1/8 Pages) Maxim Integrated Products – 1.6muA, RS-485/RS-422, Half-Duplex, Differential Transceiver for Battery-Powered Systems

19-0497; Rev 0; 2/98
1.6µA, RS-485/RS-422, Half-Duplex,
Differential Transceiver for Battery-Powered Systems
________________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 VCC 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
o 1.6µA Supply Current with Receiver Enabled
o +2.5V to +5.5V Single-Supply Operation
o True Fail-Safe Receiver Input
o Available in µMAX Package
o 1/8-Unit-Load Receiver Input
o -7V to +10V Common-Mode Input Voltage Range
_______________Ordering Information
PART
MAX3471CUA
MAX3471EUA
TEMP. RANGE
0°C to +70°C
-40°C to +85°C
PIN-PACKAGE
8 µMAX
8 µMAX
___________________Pin Configuration
TOP VIEW
RO 1
RE 2
DE 3
DI 4
MAX3471
µMAX
8 V_CC
7B
6A
5 GND
Typical Application Circuit
V_CC
DI
B
D
DE
A
RO
R
B
A
RE
GND
V_CC
REMOTE UNIT
D
B
A
GND VCC
R
D
V_CC
B
DE
D
A
DI
R
RO
RE
GND
R
CENTRAL UNIT
MAX3471
DI DE RO RE
DI DE RO RE
REMOTE UNIT
REMOTE UNIT
TYPICAL HALF-DUPLEX RS-485 NETWORK
V_CC
0.1µF
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone [phone].
For small orders, phone [phone] ext. 3468.