MAX3381EEUP+T

Overview

The MAX3381EEUP+T is a dual-transmitter, dual-receiver RS-232 transceiver manufactured by Analog Devices / Maxim Integrated. It operates on a supply voltage range of +2.35V to +5.5V and supports data rates up to 250kbps. The device features AutoShutdown Plus technology, reducing supply current to 1µA during inactivity. It includes ±15kV ESD protection on all CMOS and RS-32 I/Os. The component is housed in a 20-pin TSSOP package and functions within an operating temperature range of -40°C to +85°C.

Feature Summary

• AutoShutdown Plus feature automatically reduces power consumption when no signal transitions are detected for 30 seconds.
• Integrated dual-mode regulated charge pump enables operation from lithium-ion batteries down to +2.35V.
• Provides ±15kV electrostatic discharge protection on all inputs and outputs using Human Body Model and IEC standards.
• Features a dedicated VL logic supply pin allowing compatibility with mixed-logic voltage systems down to +1.65V.

Applications

• Cell phone data lump cables
• PDA data lump cables
• GPS receivers
• Digital cameras

Procurement Notes

Verify the specific suffix 'EEUP+T' against official documentation to confirm the extended temperature range (-40°C to +85°C), TSSOP-20 packaging, and lead-free status. Ensure the source document explicitly links this ordering code to the MAX3381E functional specifications before procurement.

Selection Notes

Select the MAX3381EEUP+T over the MAX3380E variant when applications require a slower slew rate to minimize noise and electromagnetic interference (EMI). This model is optimized for battery-powered portable devices requiring low-power shutdown modes and robust ESD protection on both logic and RS-232 sides.

Part Context

This component belongs to the MAX3380E/MAX3381E family of low-voltage RS-232 transceivers. It shares architectural similarities with other Maxim interface ICs designed for mobile communications, specifically focusing on extending battery life through intelligent power management and high-density packaging solutions.

Replacement Considerations

Public confirmed substitute part numbers: MAX3380EEUP+T.

FAQ

How does the MAX3381E handle output voltages when the supply drops below 3.1V?

When VCC falls below approximately +3.1V, the device automatically reduces RS-232 output levels from ±5.5V to ±3.7V. This maintains RS-232 compatibility while lowering supply current requirements to preserve battery life.

What is the function of the INVALID pin?

The INVALID pin asserts high if any receiver input is in an invalid state (between +0.3V and -0.3V) for at least 30µs. It can be used to control the FORCEON input to manage AutoShutdown Plus behavior.

Can the MAX3381E operate with logic supplies lower than VCC?

Yes, the device features a separate VL pin that sets the logic thresholds and output levels. This allows the logic supply to be as low as +1.65V, enabling interoperability in mixed-logic voltage systems.