MAX3243CUI+G1Z

Overview

The MAX3243CUI+G1Z is a +3.0V to +5.5V RS-232 transceiver featuring AutoShutdown technology, housed in a 28-pin TSSOP package with an operating temperature range of 0°C to +70°C. It integrates three drivers and five receivers, supporting data rates up to 235kbps. The device achieves a typical supply current of 1µA during shutdown by disabling the onboard power supply when no valid signal is detected on receiver inputs for 30µs. It utilizes internal dual charge pumps to generate ±5.5V from a single supply, requiring only 0.1µF capacitors at 3.3V operation.

Feature Summary

• AutoShutdown functionality reduces supply current to 1µA when no valid RS-232 signal is present on receiver inputs for 30µs.
• Integrated dual charge pump circuitry generates required voltage levels without external ±12V supplies.
• Includes a complementary always-active receiver output (R2OUTB) for monitoring signals while other receivers are in high-impedance shutdown state.

Applications

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

Procurement Notes

Verify the specific suffix G1Z against the manufacturer's latest documentation to confirm RoHS compliance status and any minor manufacturing updates. Ensure the ordering code matches the exact pin configuration and thermal characteristics required for your PCB layout design.

Selection Notes

Select this component for applications requiring low-power standby modes where cable disconnection detection is necessary. The 28-pin TSSOP package is suitable for space-constrained designs. Verify that the 0°C to +70°C industrial temperature range meets your environmental requirements.

Part Context

This part belongs to the MAX3221/MAX3223/MAX3243 family of low-voltage RS-232 transceivers. While sharing core features like AutoShutdown and single-supply operation, it differs from the MAX3221 (1/1) and MAX3223 (2/2) by offering higher channel counts (3/5). It serves as a direct replacement for legacy RS-232 interfaces in modern low-voltage systems.

Replacement Considerations

MAX3243EUI+G1Z offers the same electrical specifications but operates over an extended temperature range of -40°C to +85°C.

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 detected on all receiver inputs for a duration of 30µs.

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

R2OUTB is a complementary receiver output that remains active even when the main receivers are in high-impedance shutdown, allowing for continuous monitoring of ring indicator or other signals.

Can the MAX3243 drive serial mice directly?

Yes, the MAX3243 is specifically designed to drive serial mice, though AutoShutdown should be disabled via FORCEOFF/FORCEON connections when used for this purpose.