MAX1486 반도체 회로 부품 판매점
RS-485/RS-422 Transceivers
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 Maxim Integrated |
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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Software-Selectable, Half-/Full-Duplex, Slew-Rate-Limited,
12Mbps, RS-485/RS-422 Transceivers in µMAX Package
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VCC) ............................................................+7V
Control Input Voltage (RE, DE, H/F) ...........-0.3V to (VCC + 0.3V)
Driver Input Voltage (DI).............................-0.3V to (VCC + 0.3V)
Driver Output Voltage (A, B, Y, Z) ..........................-8V to +12.5V
Receiver Input Voltage, Half Duplex (Y, Z) ............-8V to +12.5V
Receiver Input Voltage, Full Duplex (A, B).............-8V to +12.5V
Receiver Output Voltage (RO)....................-0.3V to (VCC + 0.3V)
Continuous Power Dissipation
10-Pin µMAX (derate 5.6mW/°C above +70°C) ............444mW
Operating Temperature Ranges
MAX148_C_ _ ......................................................0°C to +70°C
MAX148_E_ _....................................................-40°C to +85°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VCC = +5V ±5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.) (Note 1)
PARAMETER
DRIVER
Differential Driver Output
Change in Magnitude of
Differential Output Voltage
(Note 2)
SYMBOL
CONDITIONS
VOD1
VOD2
No load, Figure 5
R = 50Ω (RS-422), Figure 5
R = 27Ω (RS-485), Figure 5
∆VOD R = 50Ω or 27Ω, Figure 5
MIN TYP MAX
5
2.0
1.5 5
0.2
Driver Common-Mode Output
Voltage
VOC R = 50Ω or 27Ω, Figure 5
3
Change in Magnitude of
Common-Mode Voltage (Note 2)
Input High Voltage
Input Low Voltage
Input Current
Input Current (Y and Z for Half
Duplex, A and B for Full Duplex)
Output Leakage (Y and Z)
(MAX1481/MAX1484 Only)
Output Leakage (Y and Z)
(MAX1485/MAX1486 Only)
Driver Output Short-Circuit
Current (Note 3)
∆VOC
VIH1
VIL1
IIN1
IIN2
IO
IO
IOSD
R = 50Ω or 27Ω, Figure 5
DE, DI, RE, H/F
DE, DI, RE, H/F
DE, DI, RE, H/F
DE = GND,
VCC = GND or 5.25V
DE = GND
DE = GND
VIN = 12V
VIN = -7V
VIN = 12V
VIN = -7V
VIN = 12V
VIN = -7V
-7V ≤ VOUT ≤ 12V
0.2
2.0
0.8
±2
0.125
-0.1
10
-10
125
-100
35 250
UNITS
V
V
V
V
V
V
µA
mA
µA
µA
mA
2 _______________________________________________________________________________________
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제조업체: Maxim Integrated
( maxim )
MAX1486 transceiver
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