MAX3325CAI

Overview

The MAX3325CAI is a dual RS-232 transceiver with an integrated LCD supply and contrast controller. It operates on a single +3.0V to +3.6V supply, providing a regulated +5.0V output at 11mA for logic or display power. The device features two transmitters and two receivers supporting data rates up to 250kbps. An internal 6-bit DAC allows for 64 contrast levels, adjustable via UP/DOWN inputs. A temperature sensor compensates LCD bias against ambient changes. Shutdown modes reduce current consumption below 1µA. It is housed in a 28-pin SSOP package.

Feature Summary

• Integrates dual RS-232 transceivers with a dedicated LCD bias supply and contrast control circuitry.
• Includes a 6-bit digital-to-analog converter (DAC) with temperature compensation for precise LCD adjustment.
• Supports independent shutdown of the RS-232 section and analog circuits to minimize power consumption.
• Generates required RS-232 voltages using small external capacitors without inductors.

Applications

• PDAs and Palmtop Computers
• Handy Terminals
• GPS Receivers
• Hand-Held Medical Equipment
• Industrial Test Equipment

Procurement Notes

Verify the specific suffix CAI corresponds to the commercial temperature range (0°C to +70°C) and 28-pin SSOP package. Confirm that the ordering information matches the exact component requirements for your design. Cross-reference the datasheet revision to ensure all electrical characteristics align with your system specifications before finalizing procurement.

Selection Notes

Select this component when a single-chip solution is needed for both serial communication and LCD driving in battery-powered devices. Ensure the system logic voltage falls within the specified input range. Verify that the available external capacitor space accommodates the required charge pump components. Consider the thermal performance if operating near the upper limit of the commercial temperature range.

Part Context

The MAX3325 belongs to Maxim Integrated's family of low-power RS-232 transceivers designed for portable electronics. Unlike standard transceivers, it combines interface capabilities with display management functions. This integration reduces board space and component count, making it suitable for compact handheld instruments where power efficiency and feature density are critical design constraints.

Replacement Considerations

MAX3325CNI