MAX1481 Maxim, MAX1481 Datasheet
MAX1481
Manufacturer Part Number
MAX1481
Description
Software-Selectable / Half-/Full-Duplex / Slew-Rate-Limited / 12Mbps / RS-485/RS-422 Transceivers in MAX Package
Manufacturer
Maxim
Datasheet
1.MAX1481.pdf
(16 pages)
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Software-Selectable, Half-/Full-Duplex, Slew-Rate-Limited,
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 smallest
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.
19-1312; Rev 0; 10/97
______________________________________________________________Selection Table
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.
_______________General Description
MAX1481
MAX1484
MAX1485
MAX1486
Part
12Mbps, RS-485/RS-422 Transceivers in µMAX Package
Selectable
Selectable
Half/Full
Duplex
Full
Full
________________________________________________________________ Maxim Integrated Products
(Mbps)
0.250
0.250
Data
Rate
12
12
Limited
Slew-
Rate
Yes
Yes
No
No
Shutdown
Power
Low-
Yes
No
No
No
Enable
Driver
Yes
Yes
Yes
Yes
____________________________Features
________________________Applications
______________Ordering Information
MAX1481CUB
MAX1481EUB
MAX1484CUB
MAX1484EUB
MAX1485CUB
MAX1485EUB
MAX1486CUB
MAX1486EUB
10-Pin µMAX Package: Smallest 10-Pin Package
Software-Selectable Half-/Full-Duplex Operation
(MAX1485/MAX1486)
0.1µA Low-Current Shutdown Mode (MAX1481)
Slew-Rate Limiting Allows Error-Free Data
Transmission (MAX1481/MAX1485)
12Mbps High-Speed Operation
(MAX1484/MAX1486)
Allow up to 256 Transceivers on the Bus
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
PART
Receiver
Enable
Yes
Yes
No
No
Quiescent
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
Current
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
(µA)
300
300
300
300
Transceivers
on Bus
256
256
256
256
10 µMAX
10 µMAX
10 µMAX
10 µMAX
10 µMAX
10 µMAX
10 µMAX
10 µMAX
PIN-PACKAGE
10 µMAX
10 µMAX
10 µMAX
10 µMAX
Package
Pin-
1
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