MAX3323EEUE+T

Overview

The MAX3323EEUE+T 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. 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 logic 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 RS-232 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 logic control to facilitate transmission-line multiplexing.
• Integrated dual charge pumps generate required RS-232 voltages from a single low-voltage supply.

Applications

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

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm package type and temperature range. Confirm RoHS compliance status as indicated in official datasheets. Ensure the component matches the exact part number specifications before integration into designs.

Selection Notes

Select this component for multidrop RS-232 networks requiring a single transmitter and receiver channel. It is suitable for systems needing flexible logic voltage interfacing via the VL pin. Consider the TSSOP-16 package constraints and external capacitor requirements for the charge pump circuit during layout.

Part Context

This component belongs to the MAX3322E/MAX3323E family of RS-232 transceivers. While the MAX3322E offers two drivers and receivers for hardware handshaking, the MAX3323E provides one driver and receiver optimized for general multidrop peripheral connections.

Replacement Considerations

The MAX3322E is a related variant within the same family but contains two transmitters and receivers instead of one. Verify functional requirements match the single-channel configuration of the MAX3323E before substitution.

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 selects the 5kΩ termination, 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 transmitter and control logic, allowing compatibility with logic voltages from 1.65V to 5.5V.

How does the device manage multidrop applications?

The device supports multidrop applications by allowing transmitters to be three-stated via the TXENABLE pin and receivers to switch between standard load and high-impedance states via the RENABLE pin, enabling multiple devices to share a single communication bus.