MAX3243ECPWE4

Overview

The MAX3243ECPWE4 is a multichannel RS-232 line driver and receiver manufactured by Texas Instruments. It operates from a single 3-V to 5.5-V supply and integrates three drivers and five receivers. The device features ±15-kV electrostatic discharge (ESD) protection on all RS-232 bus lines according to the Human Body Model (HBM). It supports data rates up to 250 kbps and includes an automatic power-down mode that reduces supply current to 1 µA when no valid signal is detected. The component is housed in a 28-pin TSSOP package.

Feature Summary

• Integrates three independent line drivers and five line receivers for full-duplex communication.
• Provides ±15-kV ESD protection on all RS-232 bus pins to enhance reliability.
• Features automatic power-down functionality to minimize power consumption during idle periods.
• Operates with a single 3-V to 5.5-V power supply using internal charge pumps.

Applications

• Battery-powered portable equipment requiring low power consumption.
• Industrial control systems needing robust ESD protection.
• Personal digital assistants and handheld devices.
• Laptop and notebook computer serial port interfaces.

Procurement Notes

Verify the specific suffix CPWE4 against the manufacturer's official datasheet to confirm pinout compatibility and package dimensions. Ensure the procurement source provides traceability documentation, as this part may be subject to lifecycle changes or obsolescence notices. Cross-reference the RoHS status and environmental compliance certificates required for your assembly process before finalizing orders.

Selection Notes

Select this component when designing systems requiring multiple RS-232 channels within a limited board space. The 250 kbps data rate suits standard asynchronous communication needs. Consider the TSSOP-28 package constraints for thermal management and PCB layout. Verify that the 1 µA shutdown current meets the strictest battery life requirements of the target application compared to higher-speed alternatives.

Part Context

This part belongs to the MAX3243 family of multichannel RS-232 transceivers. It shares core electrical specifications with variants like the MAX3243EIDWR and MAX3243ECRHBR but differs in packaging and temperature ratings. The 'E' designation typically indicates an extended industrial temperature range, while the suffix defines the specific physical package type offered by Texas Instruments.

Replacement Considerations

Direct replacements include other MAX3243 variants such as MAX3243EIDWR or MAX3243ECRHBR, provided the package footprint matches the design. Verify that substitute parts maintain the same 250 kbps data rate and 1 µA shutdown current specifications to ensure functional equivalence without redesigning the external capacitor network.