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PDF MAX1482 Data sheet ( Hoja de datos )
| Número de pieza | MAX1482 | |
| Descripción | Slew-Rate-Limited RS-485 Transceivers | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX1482 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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19-0367; Rev 1; 5/06
20µA, 1⁄8-Unit-Load, Slew-Rate-Limited
RS-485 Transceivers
_______________General Description
The MAX1482 and MAX1483 are low-power trans-
ceivers for RS-485 and RS-422 communication. Both
feature slew-rate-limited drivers that minimize EMI and
reduce reflections caused by improperly terminated
cables. Data rates are guaranteed up to 250kbps.
The MAX1482/MAX1483 draw only 20µA of supply cur-
rent. Additionally, they have a low-current shutdown
mode that consumes only 0.1µA. Both parts operate
from a single +5V supply.
Drivers are short-circuit current limited and are protect-
ed 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.
The MAX1482 is full duplex and the MAX1483 is half
duplex. Both parts have a 1⁄8-unit-load input impedance
that guarantees up to 256 transceivers on the bus.
________________________Applications
Low-Power RS-485/RS-422 Networks
Transceivers for EMI-Sensitive Applications
Industrial-Control Local Area Networks
Large 256-Node LANs
_________Typical Operating Circuits
____________________________Features
♦ Low 20µA Operating Current
♦ Slew-Rate Limited for Reduced EMI and
Reduced Reflections
♦ 0.1µA Low-Current Shutdown Mode
♦ Designed for RS-485 and RS-422 Applications
♦ Operate from a Single +5V Supply
♦ -7V to +12V Common-Mode Input Voltage Range
♦ Allows up to 256 Transceivers on the Bus—
Guaranteed (1⁄8-unit load)
♦ Current Limiting and Thermal Shutdown for
Driver Overload Protection
Ordering Information
PART
MAX1482CPD
MAX1482CSD
MAX1482EPD
MAX1482ESD
MAX1483CPA
MAX1483CSA
MAX1483CUA
MAX1483EPA
MAX1483ESA
TEMP RANGE PIN-PACKAGE
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
14 PDIP
14 SO
14 PDIP
14 SO
8 PDIP
8 SO
8 µMAX®
8 PDIP
8 SO
PKG
CODE
P14-3
S14-4
P14-3
S14-4
P8-1
S8-5
U8-1
P8-1
S8-5
_________________Pin Configurations
RO 1
RE 2
DE 3
DI 4
R
D
+5V
8 VCC
7B
Rt
6
A
5 GND
MAX1483
B
Rt
A
DE
DI
D
R RO
RE
NOTE: PIN LABELS Y AND Z ON TIMING, TEST, AND WAVEFORM
DIAGRAMS REFER TO PINS A AND B WHEN DE IS HIGH.
TYPICAL OPERATING CIRCUIT SHOWN WITH DIP/SO PACKAGE.
MAX1482 appears at end of data sheet.
TOP VIEW
RO 1
RE 2
DE 3
DI 4
R
D
DIP/SO
8 VCC
7B
6A
5 GND
B1
VCC 2
RO 3
RE 4
MAX1483
8A
7 GND
6 DI
5 DE
µMAX
MAX1482 appears at end of data sheet.
µMAX is a registered trademark of Maxim Integrated products, Inc.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 page  
20µA, 1⁄8-Unit-Load, Slew-Rate-Limited
RS-485 Transceivers
______________________________________________________________Pin Description
MAX1482
DIP/SO
PIN
MAX1483
DIP/SO
µMAX
21
3
32
4
43
5
6, 7
9
10
—
12
—
11
14
1, 8, 13
4
5
—
—
6
—
7
—
8
—
5
6
7
—
—
8
—
1
—
2
—
NAME
FUNCTION
RO
RE
DE
DI
GND
Y
Z
A
A
B
B
VCC
N.C.
Receiver Output. With the receiver output enabled (RE low), RO is high if
A > B by 200mV or when A and B are not connected, and RO is low if A < B
by 200mV.
Receiver Output Enable. When RE is low, RO is enabled. When RE is high, RO
is high impedance. If RE is high and DE is low, the MAX1482/MAX1483 enter
a low-power (0.1µA) shutdown state.
Driver Output Enable. The driver outputs, A and B, (Y and Z for the MAX1482)
are enabled by bringing DE high. When DE is low, the driver outputs are high
impedance, and the devices can function as line receivers if RE is low. If RE is
high and DE is low, the parts will enter a low-power (0.1µA) shutdown state. If
the driver outputs are enabled, the devices function as line drivers.
Driver Input. With DE high, a low on DI forces output Y low and output Z high,
and a high on DI forces output Y high and output Z low.
Ground
Noninverting Driver Output
Inverting Driver Output
Noninverting Receiver Input and Noninverting Driver Output
Noninverting Receiver Input
Inverting Receiver Input and Inverting Driver Output
Inverting Receiver Input
Positive Supply: 4.75V to 5.25V
No Connect—not internally connected
_______________________________________________________________________________________ 5
5 Page 
20µA, 1⁄8-Unit-Load, Slew-Rate-Limited
RS-485 Transceivers
A
RO R 120Ω
RE B
DE
DI D
Z
120Ω
Y
Y ZB A
R
D
DI DE RE RO
NOTE: RE AND DE ON.
Figure 15. MAX1482 Full-Duplex RS-485 Network
RO R
RE
DE
DI D
MAX1482
A
120Ω
B
DATA IN
Z
120Ω
Y
DATA OUT
NOTE: RE AND DE ON.
Figure 16. Line Repeater for MAX1482
Y
120Ω
Z
D
B
120Ω
R
Y ZB A
A
R
D
MAX1482
DI
DE
RE
RO
DI DE RE RO
Typical Operating Circuits
________________________(continued)
DI 5
RO 2
N.C. 1, 8, 13
DE VCC
4 14
D
R
9Y
10
Z
12 A
Rt
11
B
3 6, 7
RE GND
MAX1482
VCC RE
Rt R
D
GND DE
RO
DI
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet MAX1482.PDF ] | |
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