19-0497; Rev 0; 2/98
1.6µA, RS-485/RS-422, Ha lf-Duple x,
Diffe re ntia l Tra ns c e ive r for Ba tte ry-Pow e re d Sys te m s
MAX3471
________________Ge n e ra l De s c rip t io n
____________________________Fe a t u re s
♦ 1.6µA Supply Current with Receiver Enabled
♦ +2.5V to +5.5V Single-Supply Operation
♦ True Fail-Safe Receiver Input
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.
♦ Available in µMAX Package
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-
mina te d b us a re d is a b le d (hig h imp e d a nc e ). The
MAX3471 has a 1/8-unit load input resistance. When
♦ 1/8-Unit-Load Receiver Input
♦ -7V to +10V Common-Mode Input Voltage Range
_______________Ord e rin g In fo rm a t io n
driver outputs are enabled and pulled above V
below GND, internal circuitry prevents battery back-
charging.
or
CC
PART
TEMP. RANGE
0°C to +70°C
PIN-PACKAGE
8 µMAX
MAX3471CUA
MAX3471EUA
-40°C to +85°C
8 µMAX
The MAX3471 is available in an 8-pin µMAX package.
________________________Ap p lic a t io n s
___________________P in Co n fig u ra t io n
Remote Meter Reading
TOP VIEW
Battery-Powered Differential Communications
Level Translators
RO
RE
DE
DI
1
2
3
4
8
7
6
5
V
CC
B
MAX3471
A
GND
µMAX
Typ ic a l Ap p lic a t io n Circ u it
V
CC
V
CC
V
CC
0.1µF
B
A
B
A
DI
DE
DI
D
D
DE
B
A
B
A
RO
RE
R
R
RO
RE
V
CC
GND
V
CC
GND
GND
REMOTE UNIT
R
R
D
D
CENTRAL UNIT
DI
DE
DI
DE
RO RE
RO RE
MAX3471
REMOTE UNIT
REMOTE UNIT
TYPICAL HALF-DUPLEX RS-485 NETWORK
________________________________________________________________ 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.