MAX3243EEAI+G1Z

Overview

The MAX3243EEAI+G1Z is a true RS-232 transceiver featuring three drivers and five receivers in a 28-pin SSOP package. It operates from a single +3.0V to +5.5V supply with an integrated dual charge pump generating ±5.5V internally. The device incorporates AutoShutdown technology, reducing supply current to 1µA when no valid signal is detected on receiver inputs for 30µs. It supports data rates up to 235kbps and includes an always-active complementary receiver output (R2OUTB) for external monitoring during shutdown.

Feature Summary

• AutoShutdown functionality reduces power consumption by disabling the onboard power supply and drivers when valid RS-232 signals are absent.
• Integrated dual charge-pump circuitry eliminates the need for external ±12V supplies, enabling operation from a single low-voltage source.
• Complementary R2OUTB pin provides continuous monitoring of receiver activity even when primary receivers are disabled in shutdown mode.

Applications

• Battery-powered equipment requiring extended standby life
• Hand-held devices and portable diagnostics equipment
• Peripherals utilizing serial mouse interfaces

Procurement Notes

Verify the specific suffix G1Z against the manufacturer's official documentation to confirm RoHS compliance status and exact package variant. Confirm that the ordering information matches the required temperature range and pin configuration before finalizing procurement orders.

Selection Notes

Select this component when system design requires low-power standby modes combined with standard RS-232 connectivity. Ensure the application can accommodate the internal charge pump capacitors and verify that the 28-pin SSOP footprint fits the PCB layout constraints.

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 siblings by offering a higher channel count (3Tx/5Rx) and specialized outputs for peripheral control.

Replacement Considerations

MAX3243EAI is the direct functional equivalent without the suffix designation. Verify compatibility with MAX3243EWI or MAX3243EUI if different package types are required, ensuring pinout alignment remains consistent across variants.

FAQ

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

The device enters AutoShutdown mode after detecting no valid signal levels on all receiver inputs for a duration of 30µs, subsequently shutting down the power supply and drivers to achieve 1µA current consumption.

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

R2OUTB is a complementary, always-active receiver output that allows monitoring of external RS-232 devices, such as ring indicators, even when the main receivers are in a high-impedance state due to shutdown.

Can the MAX3243 drive serial mice directly?

Yes, the MAX3243 is specifically designed to drive serial mice from low-voltage supplies, meeting their current and voltage requirements while operating within the +3.0V to +5.5V range.