MAX3323EEPE+

Overview

The MAX3323EEPE+ is a single-transmitter, single-receiver RS-232 transceiver designed for multidrop applications. It operates from a 3.0V to 5.5V supply and supports data rates up to 250kbps. The device features ±15kV ESD protection on all I/O pins using Human Body Model, IEC 1000-4-2 Air-Gap, and Contact Discharge standards. It includes pin-selectable receiver input resistance (5kΩ or high impedance) and a dedicated VL logic supply pin for mixed-voltage system compatibility. The component utilizes a dual charge pump requiring four small capacitors and offers a low-power shutdown mode with 1µA typical current consumption.

Feature Summary

• Pin-selectable receiver input resistance allows configuration between standard 5kΩ termination and high-impedance modes for multidrop bus sharing.
• Integrated dual charge pump generates required RS-232 voltage levels from a single low-voltage supply without external inductors.
• Enhanced electrostatic discharge protection ensures robustness against ±15kV human body model and IEC 1000-4-2 discharge events.
• Dedicated VL logic supply pin enables direct interface with mixed-voltage microprocessor systems ranging from 1.65V to 5.5V.

Applications

• Bar-code scanners
• Video security systems
• Industrial data acquisition equipment

Procurement Notes

Verify the specific ordering suffix 'EPE+' corresponds to the 16-pin DIP package variant when sourcing components. Confirm that the supplier provides documentation verifying compliance with RoHS directives and lead-free manufacturing processes. Ensure the received units match the specified -40°C to +85°C operating temperature range for industrial reliability.

Selection Notes

Select this component for designs requiring multidrop RS-232 communication where multiple peripherals share a single serial bus line. The pin-selectable receiver impedance is critical for maintaining signal integrity across shared lines. Consider the separate VL pin if the host logic operates at voltages different from the main power supply.

Part Context

This part belongs to the MAX3322E/MAX3323E family of low-power RS-232 transceivers. While the MAX3322E provides two drivers and receivers for hardware handshaking, the MAX3323E is optimized for simpler multidrop configurations with a single transmitter and receiver pair.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.

FAQ

How does the MAX3323EEPE+ support multidrop applications?

It features pin-selectable receiver input resistance, allowing one receiver to maintain a standard 5kΩ load while others switch to high impedance, ensuring RS-232 compliance on shared buses.

What is the function of the VL pin?

The VL pin serves as the logic-level supply input, setting the output voltage levels for receiver outputs and defining the input thresholds for transmitters and control pins, enabling compatibility with mixed-voltage systems.

What ESD protection levels are guaranteed?

The device guarantees ±15kV protection via the Human Body Model and IEC 1000-4-2 Air-Gap Discharge methods, along with ±8kV protection via the IEC 1000-4-2 Contact Discharge method.