MAX3381ECUP+T

Overview

The MAX3381ECUP+T is a +2.35V to +5.5V powered RS-232 transceiver featuring two transmitters and two receivers. It supports data rates up to 250kbps with a slower slew rate for noise reduction. The device incorporates AutoShutdown Plus technology, reducing supply current to 1µA when idle. All RS-232 inputs, outputs, and logic pins provide ±15kV ESD protection. A dedicated VL pin allows operation in mixed-logic voltage systems down to +1.65V. It operates within a commercial temperature range of 0°C to +70°C and utilizes a 20-pin TSSOP package.

Feature Summary

• AutoShutdown Plus feature automatically reduces power consumption by shutting down the on-board power supply and drivers after 30 seconds of inactivity.
• Integrated dual-mode regulated charge pump enables true RS-232 performance from low supply voltages using only four small capacitors.
• Dedicated VL logic supply input sets CMOS logic thresholds and output levels, enabling compatibility with mixed-voltage logic systems.
• Enhanced electrostatic discharge protection on all CMOS and RS-32 I/Os ensures reliability without latch-up during high-stress events.

Applications

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

Procurement Notes

Verify the specific suffix 'CUP' confirms the commercial temperature range (0°C to +70°C) and TSSOP-20 packaging. Confirm the '+T' designation indicates tape-and-reel delivery format. Cross-reference the manufacturer's latest documentation to ensure component availability and compliance status before finalizing procurement orders.

Selection Notes

Select this model over the MAX3380E variant when lower data rates are sufficient but reduced electromagnetic interference is required due to its slower slew rate. Ensure the system logic voltage aligns with the VL pin range (+1.65V to +5.5V). Verify that the 250kbps maximum data rate meets the application requirements compared to higher-speed alternatives.

Part Context

This component belongs to the MAX3380E/MAX3381E family of low-power RS-232 transceivers designed for portable electronics. It shares architectural similarities with other Maxim Integrated interface devices but is distinctively optimized for battery-powered applications requiring extended standby life through advanced shutdown features.

Replacement Considerations

The MAX3380ECUP+T serves as a functional substitute if higher data rates up to 460kbps are acceptable. Other members of the MAX3380E/MAX3381E series may be considered based on specific temperature range or package variations.

FAQ

How does the AutoShutdown Plus feature function?

The device enters a 1µA shutdown mode when it does not detect a valid signal transition on any receiver or transmitter input for 30 seconds. It wakes up immediately upon detecting a valid edge.

What is the purpose of the VL pin?

The VL pin acts as a separate logic supply input that sets the threshold for transmitter inputs and the output voltage levels for receiver and INVALID outputs, allowing interoperability with mixed-logic voltage systems.

What distinguishes the MAX3381E from the MAX3380E?

The MAX3381E operates at a maximum data rate of 250kbps with a slower slew rate, whereas the MAX3380E supports up to 460kbps with a faster slew rate.