MAX3244ECAI+

Overview

The MAX3244ECAI+ is a true RS-232 transceiver from the MAX3244E series, manufactured by Analog Devices/Maxim Integrated. It operates on a single +3.0V to +5.5V supply and features three drivers and five receivers for full-duplex communication. The device guarantees a data rate of 250kbps with worst-case loads of 3kΩ in parallel with 1000pF. It incorporates AutoShutdown Plus technology, achieving a typical supply current of 1μA when inactive. I/O pins are protected against ±15kV ESD via Air-Gap Discharge and Human Body Model standards. The component utilizes a dual charge pump requiring four 0.1μF capacitors and is housed in a 28-pin SSOP package.

Feature Summary

• AutoShutdown Plus functionality automatically reduces power consumption by shutting down internal charge pumps during periods of inactivity or cable disconnection.
• Integrated INVALID output signal indicates the presence or absence of valid RS-232 voltage levels at receiver inputs.
• Proprietary low-dropout transmitter output stage enables true RS-232 performance across the specified voltage range using minimal external capacitance.
• Enhanced electrostatic discharge protection ensures robust operation in high-interference environments.

Applications

• Notebook, subnotebook, and palmtop computers
• Cellular phones and battery-powered equipment
• Hand-held devices and peripherals
• Printers and automotive systems

Procurement Notes

Verify the specific suffix 'CAI+' corresponds to the required industrial temperature range (-40°C to +85°C) and SSOP-28 packaging configuration. Confirm lead-free/RoHS compliance status as indicated by the '+' designation. Ensure the ordering information matches the exact pinout and functional requirements for the target design before finalizing procurement.

Selection Notes

Select this component for applications requiring multiple receiver lines alongside standard transmission capabilities within a space-constrained footprint. Consider the MAX3245E if a guaranteed 1Mbps data rate is necessary instead of the 250kbps limit. Evaluate the need for the R2OUTB always-active output feature if monitoring ring indicators during shutdown states is required.

Part Context

This part belongs to the MAX3224E/MAX3225E/MAX3226E/MAX3227E/MAX3244E/MAX3245E family of 3V-powered RS-232 interfaces. These devices share common features such as AutoShutdown Plus and ±15kV ESD protection but differ in driver/receiver counts and maximum data rates. The MAX3244E specifically provides a 3-driver, 5-receiver configuration optimized for complex peripheral connections.

Replacement Considerations

The MAX3245EEAI+ serves as a direct functional substitute offering identical pinouts and features but with a guaranteed 1Mbps data rate capability. Verify thermal dissipation characteristics and capacitor requirements remain compatible with the existing board layout when substituting.