MAX3320BEAP+

Overview

The MAX3320BEAP+ is a true RS-232 transceiver with an integrated microprocessor supervisory circuit, operating from a +3V to +5.5V supply. It features two drivers and two receivers supporting data rates up to 250kbps. The device incorporates AutoShutdown Plus technology, reducing supply current to 4µA when inputs are inactive for 30 seconds. A power-on reset generator provides a minimum 100ms pulse width upon power-up. The BE suffix indicates a 2.85V reset threshold and an extended temperature range of -40°C to +85°C. It utilizes a dual charge pump requiring only four external capacitors.

Feature Summary

• Integrates a microprocessor supervisory circuit with an RS-232 transceiver in a single package
• AutoShutdown Plus feature reduces supply current to 4µA during periods of inactivity
• Power-on reset output remains valid down to VCC = 1V with immunity to fast transients
• Proprietary low-dropout transmitter stage enables true RS-232 performance on a single supply

Applications

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

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm the exact reset threshold voltage and operating temperature range. Confirm that the component meets RoHS compliance standards as indicated by the plus sign in the part number. Ensure the SSOP-20 package dimensions align with the target PCB footprint requirements before finalizing procurement orders.

Selection Notes

Select this component when a combined RS-232 interface and system supervision function is required to minimize board space. The choice between suffixes depends on the specific supply voltage monitoring needs; the 'B' suffix provides a 2.85V threshold suitable for 3.3V systems. Consider the -40°C to +85°C rating if the application operates in industrial or outdoor environments compared to commercial grade alternatives.

Part Context

This device belongs to the MAX3320 family of low-power RS-232 transceivers designed for portable applications. It combines standard communication capabilities with essential system management functions. The integration of the power-on reset eliminates the need for a separate supervisor IC, simplifying the design for battery-operated devices where power conservation and component count are critical constraints.

Replacement Considerations

Check for direct pin-compatible replacements within the same product family that may offer different reset thresholds or temperature ranges. Verify that any substitute maintains the 250kbps data rate guarantee and the 4µA shutdown current specification to ensure equivalent power performance in battery-powered designs.