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 inverter
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 feature
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 minimize
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.
Notes: **This pricing is BUDGETARY, for comparing similar parts. Prices are in
U.S. dollars and subject to change. Quantity pricing may vary
substantially and international prices may differ due to local
duties, taxes, fees, and exchange rates. For volume-specific prices
and delivery, please see the price and availability page
or contact an authorized distributor.
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