MAX3243EWI+T

Overview

The MAX3243EWI+T is a +3.0V to +5.5V RS-232 transceiver featuring three drivers and five receivers in a 28-pin Wide SO package. It incorporates AutoShutdown technology, reducing supply current to 1µA when no valid signal is detected on receiver inputs for 30µs. The device operates within an industrial temperature range of -40°C to +85°C. It supports data rates up to 235kbps with typical propagation delays of 0.3µs. Internal dual charge pumps generate ±5.5V from a single supply, eliminating the need for external voltage converters.

Feature Summary

• AutoShutdown functionality reduces power consumption by disabling internal power supplies and drivers during periods of inactivity.
• Integrated dual charge pump circuitry generates required RS-232 voltages from a single low-voltage supply.
• Complementary always-active receiver output allows monitoring of serial activity while other receivers are disabled.

Applications

• Battery-powered equipment
• Hand-held devices
• Portable diagnostics equipment

Procurement Notes

Verify the specific suffix 'EWI' corresponds to the Wide SO package and extended temperature grade (-40°C to +85°C). Confirm RoHS compliance status indicated by the '+' suffix. Ensure the ordering code matches the exact pinout and thermal characteristics defined in the manufacturer's documentation before finalizing procurement.

Selection Notes

Select this component for applications requiring low-power standby modes and single-supply operation. The Wide SO package offers a larger footprint compared to SSOP or TSSOP variants. Verify that the system logic levels are compatible with the specified input thresholds. Consider the 235kbps maximum data rate against application requirements.

Part Context

This part belongs to the MAX3221/MAX3223/MAX3243 family of low-power RS-232 transceivers. The MAX3243 variant specifically provides three drivers and five receivers, distinguishing it from the lower-channel MAX3221 and MAX3223 models. The 'E' designation indicates the extended industrial temperature range.

Replacement Considerations

MAX3243EWI (non-RoHS version)

FAQ

How does the AutoShutdown feature determine when to enter low-power mode?

The device enters AutoShutdown mode if no valid RS-232 signal levels are present on all receiver inputs for a duration of 30µs.

What is the function of the R2OUTB pin on the MAX3243?

R2OUTB is a complementary, always-active receiver output that monitors RS-232 activity even when the main receivers are in a high-impedance shutdown state.

Can the MAX3243 drive serial mice directly?

Yes, the MAX3243 is designed to drive serial mice, but the AutoShutdown feature must be disabled by connecting FORCEOFF and FORCEON appropriately to ensure continuous operation.