MAX3386EEUP+

Overview

The MAX3386EEUP+ is a 3V-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 guaranteed 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 interoperation in mixed-logic voltage systems by programming both input and output logic levels. The component is housed in a space-saving 20-pin TSSOP package.

Feature Summary

• Enhanced ESD protection on Rx inputs and Tx outputs
• VL pin for compatibility with mixed-voltage systems
• Low 300µA supply current
• 1µA low-power shutdown

Applications

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

Procurement Notes

Verify the specific suffix 'E' indicates the extended temperature range (-40°C to +85°C) compared to the commercial grade. Confirm the '+T' designation corresponds to reel packaging if applicable, though datasheet ordering info lists tube options. Ensure the manufacturer source matches Analog Devices/Maxim Integrated specifications for the EEUP variant.

Selection Notes

Select this component when interfacing between 3V logic systems and standard RS-232 ports. The VL pin is critical for connecting to baseband logic as low as 1.8V without forward biasing internal devices. Ensure the application requires three transmitters, such as for ring indicator signals, rather than the standard two found in similar transceivers.

Part Context

This part belongs to the MAX3386E family of 3V RS-232 transceivers designed for portable electronics. The 'EEUP' designation specifies the extended industrial temperature range and the TSSOP-20 package type. It serves as a direct replacement for older 5V-only RS-232 solutions in battery-operated handheld devices.

Replacement Considerations

Public confirmed substitute part numbers: MAX3386ECUP (Commercial Temperature Range).

FAQ

What is the purpose of the VL pin?

The VL pin sets the logic-level supply for all CMOS inputs and outputs, allowing the receiver outputs to swing between 0 and VL. This enables compatibility with mixed-voltage systems where the host logic may be lower than VCC.

How does the shutdown mode affect power consumption?

When the SHDN pin is driven low, the supply current falls to less than 1µA. In this state, the charge pumps turn off, transmitter outputs become high impedance, and receiver outputs also go high impedance.

What ESD protection levels are guaranteed?

The device guarantees ±25kV protection via IEC 1000-4-2 Air-Gap Discharge, ±8kV via IEC 1000-4-2 Contact Discharge, and ±15kV via the Human Body Model on all RS-232 inputs and outputs.