MAX3323EEUE+

Overview

The MAX3323EEUE+ is a single-transmitter, single-receiver RS-232 transceiver designed for multidrop applications. It operates from a 3.0V to 5.5V supply and achieves data rates up to 250kbps using a dual charge pump requiring only four 0.1µF capacitors at 3.3V. The device features pin-selectable receiver input resistance (5kΩ or high impedance) controlled by the RENABLE logic signal. A dedicated VL pin allows compatibility with mixed-voltage systems ranging from 1.65V to 5.5V. It includes a low-power shutdown mode drawing less than 10µA and provides ±15kV ESD protection on all I/O pins.

Feature Summary

• Pin-selectable receiver input resistance enables standard RS-232 loading or high-impedance modes for multidrop bus sharing.
• Dedicated VL logic supply pin allows direct interface with mixed-voltage microprocessor systems.
• Transmitters are three-stated via TXENABLE control to facilitate transmission-line multiplexing.
• Integrated dual charge pump generates true RS-232 levels from low-voltage supplies.

Applications

• Bar-code scanners
• Video security systems
• Industrial data acquisition
• Data splitters

Procurement Notes

Verify the specific ordering suffix EEUE+ corresponds to the TSSOP-16 package and the -40°C to +85°C temperature range. Confirm RoHS compliance status through official manufacturer documentation. Ensure the component source is an authorized distributor to guarantee authenticity and traceability.

Selection Notes

Select this component when designing multidrop RS-232 networks requiring shared bus lines. The MAX3323E variant is appropriate for systems needing one transmitter and one receiver. Verify that the application requires the specific pin-selectable termination feature and mixed-voltage logic compatibility provided by the VL pin.

Part Context

This part belongs to the MAX3322E/MAX3323E family of RS-232 transceivers. While the MAX3322E offers two drivers and receivers for hardware handshaking, the MAX3323E provides a single driver/receiver pair optimized for peripheral connections in multidrop configurations.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the verified source material.

FAQ

How is the receiver input resistance configured?

The receiver input resistance is selectable between 5kΩ and high impedance via the RENABLE logic pin. Driving RENABLE high connects the 5kΩ resistor, while driving it low sets the input to high impedance.

What is the purpose of the VL pin?

The VL pin serves as the logic-level supply input. It sets the output voltage levels for the receiver outputs and defines the input thresholds for the transmitters and control pins, allowing operation with logic voltages from 1.65V to 5.5V.

How does the device manage power consumption?

The device enters a shutdown mode when the SHDN pin is driven low. In this state, the charge pumps turn off, outputs go to high impedance, and supply current drops to less than 10µA.