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PDF MAX3471EUA Data sheet ( Hoja de datos )
| Número de pieza | MAX3471EUA | |
| Descripción | 1.6A / RS-485/RS-422 / Half-Duplex / Differential Transceiver for Battery-Powered Systems | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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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 VCC
7B
6A
5 GND
Typical Application Circuit
VCC
DI B
D
DE A
RO R
B
RE
GND VCC
A
REMOTE UNIT
D
BA
GND VCC
R
D
VCC
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
VCC
0.1µF
________________________________________________________________ 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.
1 page  
1.6µA, RS-485/RS-422, Half-Duplex,
Differential Transceiver for Battery-Powered Systems
Typical Operating Characteristics (continued)
(VCC = +3.6V, TA = +25°C, unless otherwise noted.)
OUTPUT CURRENT vs. DRIVER
OUTPUT HIGH VOLTAGE (VCC = 5V)
45
VCC = 5V
40
35
30
25
20
15
10
5
0
-12 -10 -8 -6 -4 -2 0 2 4 6
OUTPUT HIGH VOLTAGE (V)
OUTPUT CURRENT vs. DRIVER
OUTPUT HIGH VOLTAGE (VCC = 3.6V)
25
VCC = 3.6V
20
15
10
5
0
-12 -10 -8 -6 -4 -2 0
OUTPUT HIGH VOLTAGE (V)
2
4
NO-LOAD SUPPLY CURRENT
vs. TEMPERATURE (DE = VCC)
90
80 VCC = 5.5V
70 VCC = 5.0V
60
50
VCC = 3.6V
40
30 VCC = 2.5V
20
10
DE = VCC
0
-50 -25
0 25 50 75
TEMPERATURE (°C)
100 125
NO-LOAD SUPPLY CURRENT
vs. TEMPERATURE (DE = GND)
3.0
2.5 VCC = 5.5V
VCC = 5.0V
2.0
VCC = 3.6V
1.5
1.0 VCC = 2.5V
0.5
DE = GND
0
-50 -25 0
25 50 75
TEMPERATURE (°C)
100 125
RECEIVER PROPAGATION
DELAY (tPLH) vs. TEMPERATURE
6
VCC = 3.6V
5
4
VCC = 5V
3
2
1
CIRCUIT OF FIGURE 9
CL = 100pF
|VID| = 2V
0
-40 -20 0 20
40
60
TEMPERATURE (°C)
80 100
DRIVER PROPAGATION DELAY
(tDPHL, tDPLH) vs. TEMPERATURE
1.5
VCC = 3.6V, RDIFF = 1.5kΩ
1.4
VCC = 5V, RDIFF = 1.5kΩ
1.3
1.2
1.1
VCC = 5V, RDIFF = 54Ω
1.0
VCC = 3.6V, RDIFF = 54Ω
0.9
0.8
CL1 = CL2 = 100pF
0.7
-40 -20 0 20 40 60
TEMPERATURE (°C)
80 100
RECEIVER PROPAGATION
DELAY (tPHL) vs. TEMPERATURE
7.5
7.0 VCC = 3.6V
6.5
6.0
5.5
5.0 VCC = 5V
4.5
4.0
3.5
3.0
-40 -20
|VID| = 2V
CL = 100pF
0 20 40 60 80 100
TEMPERATURE (°C)
_______________________________________________________________________________________ 5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet MAX3471EUA.PDF ] | |
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