MAX3079EEPD+

Overview

The MAX3079EEPD+ is a +3.3V, ±15kV ESD-protected, fail-safe, hot-swap RS-485 transceiver featuring one driver and one receiver in a 14-pin Plastic DIP package. It supports selectable half-duplex or full-duplex operation via the H/F pin. The device offers pin-selectable slew rates for data transmission up to 250kbps (SRL unconnected), 500kbps (SRL = VCC), or 16Mbps (SRL = GND). Independent phase control pins allow correction of twisted-pair reversal. Supply current is 0.8mA typical with shutdown mode drawing 10µA maximum.

Feature Summary

• Pin-selectable communication modes including half-duplex and full-duplex configurations
• Configurable slew-rate limiting for optimized data rates from 250kbps to 16Mbps
• Independent transmitter and receiver phase inversion capabilities
• Hot-swap input structures on DE and RE pins to prevent bus contention during insertion

Applications

• Lighting Systems
• Industrial Control
• Telecom
• Security Systems
• Instrumentation

Procurement Notes

Verify the specific suffix 'EEPD+' corresponds to the required temperature range (-40°C to +85°C) and 14-pin PDIP packaging. Confirm RoHS compliance status through official manufacturer documentation prior to procurement. Ensure ordering details match the exact functional requirements for the selected duplex and slew-rate modes.

Selection Notes

Select this component when flexible configuration of duplex mode and data rate is required within a single package. The MAX3079E is suitable for designs needing independent phase control to address wiring errors. Compare against fixed-function variants like the MAX3076E or MAX3073E if specific speed or duplex constraints simplify the design without requiring programmability.

Part Context

The MAX3079E belongs to the MAX3070E–MAX3079E family of high-speed RS-485/RS-422 transceivers manufactured by Analog Devices / Maxim Integrated. This series provides robust protection features including ±15kV ESD protection and true fail-safe receivers while maintaining EIA/TIA-485 compatibility across the product line.

Replacement Considerations

Direct functional substitutes within the same family include other MAX307xE variants such as MAX3076E or MAX3073E, though these lack the programmable slew-rate and duplex selection features of the MAX3079E. Verify pinout compatibility and electrical specifications before substitution.

FAQ

How is the data rate configured on the MAX3079E?

The data rate is set via the SRL pin: leave unconnected for 250kbps, connect to VCC for 500kbps, or connect to GND for 16Mbps.

Can the MAX3079E operate in both half-duplex and full-duplex modes?

Yes, the H/F pin selects the mode; drive it low or leave unconnected for full-duplex, or drive it high for half-duplex.

What is the purpose of the TXP and RXP pins?

These pins allow independent inversion of the transmitter and receiver phases to correct for reversed twisted-pair connections.