MAX3238ECAI+

Overview

The MAX3238ECAI+ is a multichannel RS-232 line driver and receiver manufactured by Analog Devices Inc./Maxim Integrated. It operates on a single +3.0V to +5.5V supply and features five drivers and three receivers. The device incorporates AutoShutdown Plus technology, achieving a typical shutdown supply current of 10nA when no valid signal transitions are detected. It supports data rates up to 250kbps and includes Schmitt triggers on all inputs. Enhanced ESD protection is provided on both RS-232 I/O pins and logic pins, rated at ±15kV (Human Body Model). The component is housed in a 28-pin SSOP package and is specified for an operating temperature range of 0°C to +70°C.

Feature Summary

• AutoShutdown Plus feature automatically reduces power consumption by shutting down the onboard power supply and drivers when no valid signal transitions are detected on receiver or transmitter inputs.
• Enhanced electrostatic discharge (ESD) protection is integrated on all RS-232 input/output pins as well as logic I/O pins, eliminating the need for external protection components.
• Transmitter inputs, FORCEON, and FORCEOFF include active positive feedback resistors that retain valid logic levels if the driving signal is removed or becomes high impedance.
• An always-active noninverting receiver output (R1OUTB) allows monitoring of receiver activity while other receivers are in a high-impedance state during shutdown.

Applications

• Cellular data cables
• Modems
• Battery-powered equipment
• Peripherals
• Data cradles

Procurement Notes

Verify the specific ordering suffix 'CAI' corresponds to the commercial temperature range (0°C to +70°C) and the 28-pin SSOP package configuration. Confirm that the manufacturer designation matches Analog Devices Inc./Maxim Integrated specifications. Ensure compatibility with required voltage levels and interface standards before finalizing procurement orders.

Selection Notes

Select the MAX3238ECAI+ for applications requiring low-power standby modes and robust ESD protection on logic interfaces. This part is suitable for systems powered between 3.0V and 5.5V. Note that the MAX3248E variant offers low-level logic thresholds for 1.8V systems, whereas this model uses standard logic thresholds. Ensure adequate decoupling capacitors are used for the charge pump operation.

Part Context

This component belongs to the MAX3238E/MAX3248E family of +3.0V to +5.5V RS-232 transceivers. The primary distinction within this family lies in the input logic thresholds; the MAX3238E utilizes standard thresholds, while the MAX3248E features low-level thresholds designed for 1.8V systems. Both share identical pinouts, ESD protection ratings, and AutoShutdown Plus functionality.

Replacement Considerations

Public confirmed substitute part numbers: MAX3238EEAI, MAX3248EEAI, MAX3248ECAI.