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PDF MAX1484 Data sheet ( Hoja de datos )

Número de pieza MAX1484
Descripción RS-485/RS-422 Transceivers
Fabricantes Maxim Integrated　
Logotipo Maxim Integrated Logotipo



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19-1312; Rev 1; 3/06
Software-Selectable, Half-/Full-Duplex, Slew-Rate-Limited,
12Mbps, RS-485/RS-422 Transceivers in µMAX Package
_______________General Description
The MAX1481/MAX1484/MAX1485/MAX1486 provide
software-selectable, half-/full-duplex, low-power, slew-
rate-limited, and high-speed (12Mbps) RS-485/RS-422
operation in a 10-pin µMAX® package—the smal-
lest 10-pin package available.
The software-selectable, half-/full-duplex MAX1485/
MAX1486 make obsolete the normally larger and more
expensive solutions required for selectable half-/full-
duplex RS-485/RS-422 operation: 1) a 14-pin, full-
duplex transceiver configured via jumpers between
receiver and transmitter lines, or 2) two 8-pin, half-
duplex transceivers, which require an additional invert-
er logic gate for software selectability.
The MAX1481/MAX1484 are functionally equivalent to
the industry-standard MAX491 and 75180, and are
designed for space-constrained, full-duplex RS-422
applications.
All parts contain one driver and one receiver and fea-
ture a 1/8-unit-load receiver input impedance, allowing
up to 256 transceivers on the bus. The MAX1481/
MAX1485 feature reduced-slew-rate drivers that mini-
mize EMI and reduce reflections caused by improperly
terminated cables, allowing error-free data transmission
up to 250kbps. The MAX1484/MAX1486 driver slew
rates are not limited, allowing them to transmit up to
12Mbps.
The MAX1481/MAX1484/MAX1485/MAX1486 draw only
300µA of supply current. The MAX1481 has a low-power
shutdown mode that reduces supply current to only
0.1µA. All devices operate from a single 5V supply.
Drivers are output short-circuit current limited and are
protected against excessive power dissipation by
thermal-shutdown circuitry that places the driver outputs
into a high-impedance state. The receiver input has a fail-
safe feature that guarantees a logic-high output if the
input is open circuit.
____________________________Features
o 10-Pin µMAX Package: Smallest 10-Pin Package
o Software-Selectable Half-/Full-Duplex Operation
(MAX1485/MAX1486)
o 0.1µA Low-Current Shutdown Mode (MAX1481)
o Slew-Rate Limiting Allows Error-Free Data
Transmission (MAX1481/MAX1485)
o 12Mbps High-Speed Operation
(MAX1484/MAX1486)
o Allow up to 256 Transceivers on the Bus
______________Ordering Information
PART
MAX1481CUB
MAX1481EUB
MAX1484CUB
MAX1484EUB
MAX1485CUB
MAX1485EUB
MAX1486CUB
MAX1486EUB
TEMP RANGE
0°C to +70°C
-40°C to +85°C
0°C to +70°C
-40°C to +85°C
0°C to +70°C
-40°C to +85°C
0°C to +70°C
-40°C to +85°C
PIN-PACKAGE
10 µMAX
10 µMAX
10 µMAX
10 µMAX
10 µMAX
10 µMAX
10 µMAX
10 µMAX
________________________Applications
Low-Power RS-422/RS-485 Communications
Level Translators
Hand-Held Equipment
Battery-Powered Equipment
Transceiver for EMI-Sensitive Applications
Industrial-Control Local Area Networks
µMAX is a registered trademark of Maxim Integrated Products, Inc.
______________________________________________________________Selection Table
Part
MAX1481
MAX1484
MAX1485
MAX1486
Half/Full
Duplex
Full
Full
Selectable
Selectable
Data
Rate
(Mbps)
0.250
12
0.250
12
Slew-
Rate
Limited
Yes
No
Yes
No
Low-
Power
Shutdown
Yes
No
No
No
Driver
Enable
Yes
Yes
Yes
Yes
Receiver
Enable
Yes
Yes
No
No
Quiescent
Current
(µA)
Transceivers
on Bus
300 256
300 256
300 256
300 256
Pin-
Package
10 µMAX
10 µMAX
10 µMAX
10 µMAX
________________________________________________________________ Maxim Integrated Products 1
________________________________________________________________ Maxim Integrated Products 1
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1 page




MAX1484 pdf
Software-Selectable, Half-/Full-Duplex, Slew-Rate-Limited,
12Mbps, RS-485/RS-422 Transceivers in µMAX Package
__________________________________________Typical Operating Characteristics
(VCC = +5V, TA = +25°C, unless otherwise noted.)
NO-LOAD SUPPLY CURRENT
vs. TEMPERATURE
360
340 MAX1481/MAX1485
320
300
280
MAX1484/MAX1486
260
240
220
-60 -40 -20 0 20 40 60
TEMPERATURE (°C)
80 100
SHUTDOWN CURRENT
vs. TEMPERATURE
114
110
106
102
98
94
-60 -40 -20 0 20 40 60
TEMPERATURE (°C)
80 100
OUTPUT CURRENT vs.
RECEIVER OUTPUT LOW VOLTAGE
60
50
40
30
20
10
0
0
1234
OUTPUT LOW VOLTAGE (V)
5
RECEIVER OUTPUT LOW VOLTAGE
vs. TEMPERATURE
0.50
IRO = 8mA
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
-60 -40 -20 0 20 40 60
TEMPERATURE (°C)
80 100
OUTPUT CURRENT vs.
RECEIVER OUTPUT HIGH VOLTAGE
30
25
20
15
10
5
0
0
1234
OUTPUT LOW VOLTAGE (V)
5
RECEIVER OUTPUT HIGH VOLTAGE
vs. TEMPERATURE
4.5
IRO = 8mA
4.4
4.3
4.2
4.1
4.0
3.9
3.8
-60 -40 -20 0 20 40 60
TEMPERATURE (°C)
80 100
MAX1481/MAX1485 RECEIVER
PROPAGATION DELAY vs. TEMPERATURE
105
CLOAD = 15pF
100
95
90
85
80
75
-60 -40 -20 0 20 40 60
TEMPERATURE (°C)
80 100
MAX1484/MAX1486 RECEIVER
PROPAGATION DELAY vs. TEMPERATURE
94
93 CLOAD = 15pF
92
91
90
89
88
87
86
-60 -40 -20 0 20 40 60
TEMPERATURE (°C)
80 100
MAX1481/MAX1485 DRIVER
PROPAGATION DELAY vs. TEMPERATURE
680
RDIFF = 54Ω
660 CL1 = CL2 = 100pF
640
620
600
580
560
540
-60 -40 -20 0 20 40 60
TEMPERATURE (°C)
80 100
_______________________________________________________________________________________ 5

5 Page





MAX1484 arduino
Software-Selectable, Half-/Full-Duplex, Slew-Rate-Limited,
12Mbps, RS-485/RS-422 Transceivers in µMAX Package
Y
VOD
Z
R
R VOC
Figure 5. Driver DC Test Load
3V
DE
DI
Y
VID
Z
CL1
RDIFF
CL2
RECEIVER TEST POINT
OUTPUT
CL
1k
1k
VCC
S1
S2
Figure 6. Receiver Enable/Disable Timing Test Load
OUTPUT
UNDER TEST
500Ω
CL
VCC
S1
S2
Figure 7. Driver Timing Test Circuit
Figure 8. Driver Enable/Disable Timing Test Load
3V
DI
0V
1.5V
Z
Y
VDIFF
VO
0V
-VO
VO
1/2 VO
10%
tR
tDPLH
tDPHL
1.5V
1/2 VO
VDIFF = VY - VZ
90%
90%
tF
tSKEW = | tPLH - tPHL |
10%
Figure 9. Driver Propagation Delays
3V
DE
0V
Y, Z
VOL
Y, Z
0V
1.5V
1.5V
tDZL(SHDN), tDPL
tDLZ
2.3V OUTPUT NORMALLY LOW
OUTPUT NORMALLY HIGH
2.3V
DZH(SHDN), DZH
DHZ
VOL +0.5V
VOH -0.5V
Figure 10. Driver Enable and Disable Times
______________________________________________________________________________________ 11

11 Page







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