MAX1480ACPI

MAX1480ACPI

Complete, Isolated RS-485/RS-422 Data Interface

General Description

The MAX1480A/MAX1480B/MAX1480C/MAX1490A/

MAX1490B are complete, electrically isolated, RS-485/

RS-422 data-communications interface solutions in a

hybrid microcircuit. Transceivers, optocouplers, and a

transformer provide a complete interface in a standard

DIP package. A single +5V supply on the logic side powers both sides of the interface.

The MAX1480B/MAX1480C/MAX1490B feature reducedslew-rate drivers that minimize EMI and reduce reflections caused by improperly terminated cables, allowing

error-free data transmission at data rates up to 250kbps.

The MAX1480A/MAX1490A driver slew rate is not limited,

allowing transmission rates up to 2.5Mbps. The

MAX1480A/B/C are designed for half-duplex communication, while the MAX1490A/B feature full-duplex communication.

Drivers are short-circuit current limited and protected

against excessive power dissipation by thermal shutdown circuitry that places the driver outputs into a highimpedance state. The receiver input has a fail-safe

feature that guarantees a known output (RO low for the

MAX1480A/B/C, RO high for the MAX1490A/B/C) if the

input is open circuit.

The MAX1480A/MAX1480B/MAX1480C/MAX1490A/

MAX1490B typically withstand 1600VRMS (1 minute) or

2000VRMS (1 second). Their isolated outputs meet all 

RS-485/RS-422 specifications. The MAX1480A/B/C are

available in a 28-pin DIP package, and the MAX1490A/B

are available in a 24-pin DIP package.

Applications

Isolated RS-485/RS-422 Data Interface

Transceivers for EMI-Sensitive Applications

Industrial-Control Local Area Networks

Automatic Test Equipment

HVAC/Building Control Networks

Next-Generation Device Features

 For Integrated ESD Protection

MAX1480E/MAX1490E: ±15kV ESD-Protected,

Isolated RS-485/RS-422 Data Interfaces

 For Space-Constrained Applications

MAX3157: High CMRR, RS-485 Transceiver with

±50V Isolation

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