MAX3381ECUP+

Overview

The MAX3381ECUP+ is a +2.35V to +5.5V-powered EIA/TIA-232 and V.28/V.24 communication interface featuring two receivers and two transmitters. It supports data rates up to 250kbps with an operating temperature range of 0°C to +70°C in a 20-pin TSSOP package. The device incorporates AutoShutdown Plus technology, reducing supply current to 1µA when no valid signal transitions are detected for 30 seconds. All RS-32 inputs, outputs, and logic pins provide ±15kV ESD protection via the Human Body Model and IEC 1000-4-2 Air-Gap Discharge methods. A dedicated VL pin allows interoperation in mixed-logic voltage systems down to +1.65V.

Feature Summary

• AutoShutdown Plus feature automatically reduces power consumption by shutting down the on-board power supply and drivers after 30 seconds of inactivity.
• Proprietary low-dropout transmitter output stage enables true RS-232 performance from a +3.1V to +5.5V supply using a dual charge pump.
• Includes a unique VL pin that sets CMOS logic thresholds and outputs, allowing compatibility with cell phone logic supply voltages as low as +1.65V.
• Provides enhanced electrostatic discharge protection on both TTL/CMOS and RS-232 sides without requiring external components.

Applications

• Cell Phone Data Lump Cables
• PDA Data Lump Cables
• GPS Receivers
• Digital Cameras

Procurement Notes

Verify the specific ordering suffix against official manufacturer documentation to confirm the exact temperature grade and RoHS compliance status. Confirm the package type matches the required PCB footprint. Ensure the component meets the necessary environmental standards for the intended deployment environment before finalizing procurement.

Selection Notes

Select the MAX3381ECUP+ over the MAX3380E variant when lower data rates are sufficient, as it offers a slower slew rate to minimize noise and electromagnetic interference (EMI). This makes it suitable for applications where signal integrity is prioritized over maximum throughput. Ensure the system operates within the specified +2.35V to +5.5V supply range.

Part Context

This component belongs to the MAX3380E/MAX3381E family of RS-232 transceivers designed for portable electronics. It shares core architectural features with the MAX3380E but differs in maximum data rate specifications. The ECUP suffix indicates a commercial temperature range and TSSOP packaging, distinguishing it from industrial temperature variants or other package styles within the same product line.

Replacement Considerations

Public confirmed substitute part numbers: MAX3380ECUP+