MAX3243CWI+T

Overview

The MAX3243CWI+T is a multichannel RS-232 line driver and receiver manufactured by Analog Devices Inc./Maxim Integrated. It operates from a single +3.0V to +5.5V supply and features an integrated dual charge pump that generates ±5.5V internally, eliminating the need for external bipolar supplies. The device includes three transmitters and five receivers with AutoShutdown capability, reducing supply current to 1µA when no valid signal is detected. It supports data rates up to 235kbps, provides ±15kV ESD protection on receiver inputs, and utilizes 0.1µF capacitors for 3.3V operation.

Feature Summary

• AutoShutdown technology reduces power consumption by disabling internal power supplies and drivers when no valid RS-232 signal is present on receiver inputs.
• Integrated dual charge pump circuitry generates required positive and negative voltages from a single low-voltage supply, simplifying system design.
• Includes a complementary always-active receiver output (R2OUTB) for monitoring external devices without forward-biasing other logic during shutdown states.

Applications

• Battery-powered equipment requiring extended standby life
• Hand-held portable devices with limited power budgets
• Portable diagnostic equipment interfacing via serial ports

Procurement Notes

Verify the specific suffix 'W' corresponds to the Wide SOIC package and 'I' indicates the industrial temperature range (-40°C to +85°C). Confirm the '+T' designation aligns with reel packaging requirements for automated assembly processes. Cross-reference the manufacturer's latest ordering guide to ensure component availability and compliance with current environmental standards.

Selection Notes

Select this component when designing systems requiring multiple RS-232 channels with strict power constraints. Ensure the application environment falls within the specified -40°C to +85°C operating range. Verify that the host logic voltage levels are compatible with the device's CMOS input thresholds at the chosen supply voltage.

Part Context

This part belongs to the MAX3221/MAX3223/MAX3243 family of low-power RS-232 transceivers. While the MAX3221 offers one channel and the MAX3223 offers two, the MAX3243 provides three drivers and five receivers in a 28-pin package. All variants share the same core AutoShutdown architecture and charge-pump technology.

Replacement Considerations

MAX3243CWI+ is a tube-packaged equivalent with identical electrical specifications. MAX3243EAI+T offers the same functionality in an SSOP package with the same temperature range. Verify pinout compatibility before substituting packages such as TSSOP or standard SOIC variants.