MAX3320ACAP+T

Overview

The MAX3320ACAP+T is a true RS-232 transceiver integrated with a microprocessor power-on reset circuit, operating from a +3V to +5.5V supply. It features two drivers and two receivers supporting full-duplex communication at data rates up to 250kbps. The device utilizes a dual charge pump requiring four 0.1µF external capacitors. AutoShutdown Plus reduces supply current to 4µA when inputs are inactive for 30 seconds. The RESET output asserts when VCC drops below the 4.25V threshold (suffix A) and remains valid down to 1V. It is housed in a 20-pin SSOP package.

Feature Summary

• Integrates an RS-232 transceiver with a precise power-supply supervisor that monitors voltage levels and generates a reset signal during brownout or power-up conditions.
• Features AutoShutdown Plus technology which automatically disables the internal charge pumps and transmitter outputs after 30 seconds of inactivity to minimize power consumption.
• Includes an INVALID output pin that indicates the presence or absence of valid RS-232 signal levels on the receiver inputs.

Applications

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

Procurement Notes

Verify the specific suffix 'A' corresponds to the required 4.25V reset threshold before procurement. Confirm the 'T' suffix indicates tape-and-reel packaging if reel handling is required for assembly. Ensure the component meets RoHS standards as indicated by the '+' designation. Cross-reference the manufacturer's latest documentation for any updates regarding lead-free compliance or environmental declarations.

Selection Notes

Select this component when a combined RS-232 interface and power supervision function is needed within a single package. The 4.25V reset threshold is suitable for standard 5V logic systems. Verify that the 250kbps maximum data rate aligns with the system requirements. Consider the 20-pin SSOP footprint constraints during PCB layout planning.

Part Context

This part belongs to the MAX3320 family, which includes variants with different temperature ranges and reset thresholds. The 'CAP' designation identifies the commercial temperature range (0°C to +70°C) and SSOP package. Other suffixes like 'EAP' denote extended temperature ranges (-40°C to +85°C). The 'T' suffix specifically denotes reel packaging for automated insertion.

Replacement Considerations

The MAX3320EAP+ serves as a direct functional replacement offering an extended industrial temperature range (-40°C to +85°C) while maintaining the same electrical characteristics and pinout. Ensure the reset threshold requirement matches the selected variant.