MAX3320LCAP

Overview

The MAX3320LCAP is a true 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 supports data rates up to 250kbps and includes two drivers and two receivers in a 20-pin SSOP package. The 'L' suffix designates a reset threshold of 4.63V (range 4.50V to 4.75V). It operates within a commercial temperature range of 0°C to +70°C.

Feature Summary

• Integrates an RS-232 transceiver with a precise power-on reset supervisor that asserts a low signal when VCC drops below the preset threshold.
• Features AutoShutdown Plus functionality that automatically disables the charge pump and transmitters after 30 seconds of inactivity to minimize power consumption.
• Includes an INVALID output pin that indicates when valid RS-232 signal 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 documentation to confirm the reset threshold voltage and temperature grade. Confirm the package type matches the required footprint. Check for RoHS compliance status as indicated in the official datasheet. Ensure the component source is authorized to avoid counterfeit parts.

Selection Notes

Select this component when designing battery-operated systems requiring low standby current and integrated system supervision. The MAX3320LCAP is suitable for applications needing a 4.63V reset threshold. Verify that the required data rate does not exceed 250kbps and that the operating environment falls within the 0°C to +70°C commercial range.

Part Context

The MAX3320 belongs to a family of single-supply RS-232 transceivers designed for portable electronics. Variants such as the MAX3320ACAP, MAX3320EAP, and MAX3320TAP differ primarily in their reset threshold voltages and specified operating temperature ranges. This integration simplifies board layout by combining communication and supervision functions.

Replacement Considerations

Direct replacements include other MAX3320 variants like the MAX3320ACAP or MAX3320EAP, provided the reset threshold and temperature specifications align with the design requirements. Cross-family replacements require verification of pin compatibility and electrical characteristics.