19-1312; Rev 0; 10/97
Softw a re -Se le c ta ble , Ha lf-/Full-Duple x, Sle w -Ra te -Lim ite d,
12Mbps , RS-485/RS-422 Tra ns c e ive rs in µMAX Pa c ka ge
5/MAX1486
_______________Ge n e ra l De s c rip t io n
____________________________Fe a t u re s
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.
♦ 10-Pin µMAX Package: Smallest 10-Pin Package
♦ Software-Selectable Half-/Full-Duplex Operation
(MAX1485/MAX1486)
♦ 0.1µA Low-Current Shutdown Mode (MAX1481)
The software-selectable, half-/full-duplex MAX1485/
MAX1486 make obsolete the normally larger and more
expensive solutions required for selectable half-/full-
d up le x RS-485/RS-422 op e ra tion: 1) a 14-p in, 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.
♦ Slew-Rate Limiting Allows Error-Free Data
Transmission (MAX1481/MAX1485)
♦ 12Mbps High-Speed Operation
(MAX1484/MAX1486)
♦ Allow up to 256 Transceivers on the Bus
The MAX1481/MAX1484 are functionally equivalent to
the industry-standard MAX491 and 75180, and are
designed for space-constrained, full-duplex RS-422
applications.
______________Ord e rin g In fo rm a t io n
PART
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
MAX1481CUB
MAX1481EUB
MAX1484CUB
MAX1484EUB
MAX1485CUB
MAX1485EUB
MAX1486CUB
MAX1486EUB
All parts contain one driver and one receiver and fea-
ture a 1/8-unit-load receiver input impedance, allowing
up to 256 tra ns c e ive rs on the b us . 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.
________________________Ap p lic a t io n s
Low-Power RS-422/RS-485 Communications
Level Translators
Drivers are output short-circuit current limited and are
p rote c te d a g a ins t e xc e s s ive p owe r d is s ip a tion b y
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.
Hand-Held Equipment
Battery-Powered Equipment
Transceiver for EMI-Sensitive Applications
Industrial-Control Local Area Networks
______________________________________________________________S e le c t io n Ta b le
Data
Rate
(Mbps)
Slew-
Rate
Limited
Low-
Power
Shutdown
Quiescent
Current
(µA)
Half/Full
Duplex
Driver
Enable
Receiver
Enable
Transceivers
on Bus
Pin-
Package
Part
MAX1481
MAX1484
MAX1485
MAX1486
Full
Full
0.250
12
Yes
No
Yes
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
No
300
300
300
300
256
256
256
256
10 µMAX
10 µMAX
10 µMAX
10 µMAX
Selectable
Selectable
0.250
12
Yes
No
No
________________________________________________________________ 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.
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