MAX3244ECUI+

Overview

The MAX3244ECUI+ is a true RS-232 transceiver manufactured by Analog Devices (Maxim Integrated). It operates on a single +3.0V to +5.5V supply and features AutoShutdown Plus technology, achieving a typical supply current of 1µA when inactive. The device includes three drivers and five receivers for full-duplex communication with a guaranteed data rate of 250kbps. It utilizes a dual charge pump requiring only four 0.1µF capacitors at 3.3V. The component is housed in a 28-pin TSSOP package and supports an operating temperature range from 0°C to +70°C.

Feature Summary

• AutoShutdown Plus functionality automatically reduces power consumption by shutting down the charge pump and transmitters during periods of inactivity or cable disconnection.
• Integrated INVALID output signal detects valid RS-232 voltage levels on receiver inputs independent of shutdown states.
• Dedicated R2OUTB noninverting receiver output remains active during shutdown to monitor external devices without forward biasing other components.

Applications

• Notebook, subnotebook, and palmtop computers
• Cellular phones and handheld equipment
• Battery-powered peripherals and printers

Procurement Notes

Verify the specific suffix 'C' indicates the commercial temperature range (0°C to +70°C) rather than the industrial grade (-40°C to +85°C). Confirm the 'U' package designation corresponds to the 28-pin TSSOP form factor required for the target PCB layout. Ensure the '+' suffix confirms lead-free and RoHS compliance status before finalizing procurement orders.

Selection Notes

Select this component over the MAX3245 variant if the application requires a guaranteed 250kbps data rate but does not need MegaBaud speeds up to 1Mbps. This part is suitable for systems where low standby power is critical due to the AutoShutdown Plus feature. Verify that the system UART can tolerate the high-impedance state of the R_OUT pins during shutdown while utilizing the always-active R2OUTB pin for ring detection.

Part Context

This device belongs to the MAX3224–MAX3227/MAX3244/MAX3245 family of 3V-powered RS-232 interfaces. It shares the same core architecture and AutoShutdown Plus capabilities as the MAX3224 and MAX3226, differing primarily in the number of drivers and receivers provided within the 28-pin package configuration.

Replacement Considerations

The MAX3244EAP+ serves as a direct replacement offering the same electrical specifications but packaged in SSOP-28 instead of TSSOP-28. Designers must verify pin-to-pin compatibility and ensure the mechanical footprint accommodates the alternative package dimensions.