MAX3070EEPD

Overview

The MAX3070EEPD is a +3.3V, full-duplex RS-485 transceiver featuring one driver and one receiver in a 14-pin PDIP package. It operates within an industrial temperature range of -40°C to +85°C with a supply voltage of 3.3V ±10%. The device supports data rates up to 250kbps with reduced slew-rate drivers to minimize EMI. Key electrical characteristics include ±15kV Human Body Model ESD protection on I/O pins, fail-safe circuitry guaranteeing a logic-high output when inputs are open or shorted, and hot-swap capability on DE and RE inputs. Supply current is typically 1.5mA, dropping to 10µA in shutdown mode.

Feature Summary

• Integrated fail-safe circuitry ensures a logic-high receiver output during bus idle states or input faults.
• Hot-swap input structure prevents false transitions and erroneous data transfer during board insertion into powered backplanes.
• Reduced slew-rate driver design minimizes electromagnetic interference (EMI) and signal reflections on improperly terminated cables.
• Robust protection includes ±15kV ESD tolerance on all I/O pins and thermal shutdown for driver overcurrent protection.

Applications

• Industrial control systems requiring robust communication over twisted-pair lines
• Lighting systems utilizing RS-485 networks
• Telecommunications equipment interfaces
• Security system monitoring and control panels
• General-purpose instrumentation and data acquisition

Procurement Notes

Verify the specific suffix 'EEPD' corresponds to the required industrial temperature grade (-40°C to +85°C) and 14-pin plastic DIP packaging. Confirm that the full-duplex configuration aligns with the system architecture, as other variants in the MAX3070E-MAX3079E family offer half-duplex or selectable modes. Ensure compatibility with 3.3V logic levels and check for any lead-free or RoHS compliance requirements mandated by the target assembly process.

Selection Notes

Select this component for applications requiring full-duplex RS-485 communication at speeds up to 250kbps where EMI reduction is critical. The fixed 250kbps slew rate distinguishes it from higher-speed variants like the MAX3076E. Consider the 14-pin PDIP package for through-hole prototyping or high-reliability environments. Verify that the 1/8-unit load input impedance supports the intended number of nodes on the bus, allowing up to 256 transceivers.

Part Context

The MAX3070EEPD belongs to the MAX3070E–MAX3079E family of +3.3V RS-485 transceivers manufactured by Analog Devices (Maxim Integrated). This series shares common features such as fail-safe operation, hot-swap capability, and ±15kV ESD protection. Variants differ primarily in duplex mode (full vs. half), maximum data rates (250kbps to 16Mbps), and package types. The MAX3070E specifically denotes the full-duplex, 250kbps variant.

Replacement Considerations

Direct functional substitutes within the same family include the MAX3070E in alternative packages such as SOIC (e.g., MAX3070ESA) or TSSOP. For pin-compatible replacements with different speed or duplex capabilities, verify interface changes; however, the MAX3070E's specific combination of full-duplex and 250kbps limited slew rate may require careful evaluation against faster variants like the MAX3076E.