MAX3320TEAP

Overview

The MAX3320TEAP+ is a dual RS-232 transceiver integrated with a microprocessor power-on reset circuit, operating from a +3V to +5.5V supply. It features AutoShutdown Plus technology, reducing supply current to 4µA when inputs are inactive for 30 seconds. The device guarantees data rates up to 250kbps using only four 0.1µF external capacitors. The 'T' suffix indicates a 3.08V reset threshold. It operates within the -40°C to +85°C temperature range and is housed in a 20-pin SSOP package.

Feature Summary

• Integrates an RS-232 transceiver with a precise power-on reset supervisor that asserts a low signal when VCC drops below the threshold.
• Features AutoShutdown Plus functionality that automatically disables the charge pump and drivers after 30 seconds of inactivity to minimize power consumption.
• Includes an INVALID output pin that signals when valid RS-232 levels are absent on receiver inputs for at least 90 microseconds.

Applications

• Palmtop Computers
• Portable/Battery-Powered Equipment
• Hand-Held Equipment

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm the exact reset threshold voltage and temperature grade. Confirm the presence of the '+' designation for lead-free compliance status. Ensure the component source provides traceable manufacturing records consistent with Analog Devices specifications.

Selection Notes

Select this component when designing systems requiring simultaneous RS-232 communication and microprocessor supervision in a compact footprint. The 3.08V reset threshold is suitable for 3.3V logic systems. Verify that the application environment remains within the specified -40°C to +85°C operational limits for reliable performance.

Part Context

This part belongs to the MAX3320 family of true RS-232 transceivers. The TEAP variant specifically denotes the extended industrial temperature range (-40°C to +85°C) and the T-suffix reset threshold (3.08V). It shares the core transceiver architecture with commercial variants but is optimized for broader environmental stability.

Replacement Considerations

Direct functional replacements include other MAX3320 variants such as MAX3320EAP+ or MAX3320CAP+. Selection depends on matching the required reset threshold voltage and ensuring the replacement supports the necessary operating temperature range for the target application.

FAQ

What is the function of the INVALID output?

The INVALID output asserts high when no valid RS-232 signal levels are present on any receiver input for a duration of at least 90µs.

How does AutoShutdown Plus reduce power consumption?

It monitors all receiver and transmitter inputs; if no activity is detected for 30 seconds, it shuts down the internal charge pumps and drivers, lowering supply current to 4µA.

What external components are required for operation?

The device requires four small 0.1µF external capacitors to support the dual charge pump voltage converter for generating the necessary RS-232 voltages.