MAX3386EEUP+T

Overview

The MAX3386EEUP+T is a 3.0V-powered EIA/TIA-232 and V.28/V.24 communications interface featuring two receivers and three transmitters. It operates from a +3.0V to +5.5V supply with a maximum data rate of 250kbps. The device includes a dual charge pump requiring four small capacitors for operation. All RS-232 inputs and outputs are protected against electrostatic discharge up to ±25kV using the IEC 1000-4-2 Air-Gap Discharge method. A unique VL pin allows logic-level programming for mixed-voltage systems. The component is housed in a space-saving TSSOP-20 package.

Feature Summary

• Features enhanced electrostatic discharge protection on all RS-232 inputs and outputs, ensuring robustness against high-voltage static events without latchup.
• Includes a dedicated VL pin that enables compatibility with mixed-voltage logic systems by allowing both input thresholds and output swing levels to be programmable.
• Utilizes a proprietary low-dropout transmitter output stage and dual charge pump to deliver true RS-232 performance directly from a single low-voltage supply.

Applications

• Subnotebook and Palmtop Computers
• PDAs and PDA Cradles
• Cell Phone Data Cables
• Battery-Powered Equipment

Procurement Notes

Verify the specific suffix 'EUP' corresponds to the extended temperature range (-40°C to +85°C) and TSSOP-20 packaging configuration. Confirm RoHS compliance status through official manufacturer documentation or authorized distributor declarations prior to integration into production designs.

Selection Notes

Select this component when interfacing between 3V logic systems and standard RS-232 ports requiring high ESD tolerance. The inclusion of an extra transmitter supports ring indicator signaling for cradle applications. Ensure external capacitor values meet minimum requirements for the specific operating voltage to maintain stable charge pump performance.

Part Context

This part belongs to the MAX3386E family of low-power RS-232 transceivers designed specifically for portable electronics. It shares functional similarities with other Maxim Integrated interface devices but distinguishes itself through its optimized 3V operation and integrated ESD protection capabilities suitable for handheld environments.

Replacement Considerations

Direct pin-compatible alternatives within the same product family include the MAX3386ECUP for commercial temperature ranges. Verify electrical specifications and package dimensions before substituting with components from other manufacturers.

FAQ

How does the VL pin function in mixed-voltage systems?

The VL pin serves as a separate logic supply input that sets the output voltage level for receiver outputs and defines the input thresholds for transmitters and shutdown logic, allowing direct interfacing with various logic families.

What is the maximum ESD protection rating for the RS-232 pins?

All RS-232 inputs and outputs are protected to ±25kV using the IEC 1000-4-2 Air-Gap Discharge method, ±8kV via Contact Discharge, and ±15kV using the Human Body Model.

Can the MAX3386EEUP+T operate at data rates higher than 250kbps?

No, the device is guaranteed to operate at data rates up to 250kbps while maintaining compliant RS-232 output levels under worst-case load conditions.