MAX3442EESA

±15kV ESD-Protected, ±60V Fault-Protected, 10Mbps, Fail-Safe RS-485/J1708 Transceivers

General Description

The MAX3440E–MAX3444E fault-protected RS-485 and J1708 transceivers feature ±60V protection from signal faults on communication bus lines. Each device contains one differential line driver with three-state output and one differential line receiver with three-state input. The 1/4-unitload receiver input impedance allows up to 128 transceivers on a single bus. The devices operate from a 5V supply at data rates of up to 10Mbps. True fail-safe inputs guarantee a logic-high receiver output when the receiver inputs are open, shorted, or connected to an idle data line. Hot-swap circuitry eliminates false transitions on the data bus during circuit initialization or connection to a live backplane. Short-circuit current-limiting and thermal shutdown circuitry protect the driver against excessive power dissipation, and on-chip ±15kV ESD protection eliminates costly external protection devices. The MAX3440E–MAX3444E are available in 8-pin SO and PDIP packages and are specified over industrial and automotive temperature ranges.

Applications

RS-422/RS-485 Communications Truck and Trailer Applications Industrial Networks Telecommunications Systems Automotive Applications HVAC Controls

Features

 ♦ ±15kV ESD Protection

♦ ±60V Fault Protection

♦ Guaranteed 10Mbps Data Rate (MAX3441E/MAX3443E)

♦ Hot Swappable for Telecom Applications

♦ True Fail-Safe Receiver Inputs

♦ Enhanced Slew-Rate-Limiting Facilitates Error-Free Data Transmission (MAX3440E/MAX3442E/MAX3444E)

♦ Allow Up to 128 Transceivers on the Bus

♦ -7V to +12V Common-Mode Input Range

♦ Automotive Temperature Range (-40°C to +125°C)

♦ Industry-Standard Pinout

ABSOLUTE MAXIMUM RATINGS

Voltages Referenced to GND VCC ........................................................................................+7V

FAULT, DE/RE, RE, DE, DE, DI, TXD..........-0.3V to (VCC + 0.3V)

A, B (Note 1) ........................................................................±60V

RO ..............................................................-0.3V to (VCC + 0.3V)

Short-Circuit Duration (RO, A, B) ...............................Continuous Continuous Power Dissipation

(TA = +70°C)

8-Pin SO (derate 5.9mW/°C above +70°C)..................471mW

8-Pin PDIP (derate 9.09mW/°C above +70°C).............727mW

Operating Temperature Ranges MAX344_EE_ _ ...............................................-40°C to +85°C MAX344_EA_ _ .............................................-40°C to +125°C

Storage Temperature Range .............................-65°C to +150°C

Junction Temperature......................................................+150°C

Lead Temperature (soldering, 10s) .................................+300°C

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