MAX3243ECAI+TG1Z

Overview

The MAX3243ECAI+TG1Z is a Maxim Integrated RS-232 transceiver featuring three drivers and five receivers. It operates on a single +3.0V to +5.5V supply with an operating current of 1µA in shutdown mode. The device supports data rates up to 250kbps and includes AutoShutdown functionality. It provides ±15kV ESD protection via the Human Body Model and ±8kV IEC 1000-4-2 Contact Discharge. The component is housed in a 28-pin SSOP package and functions within a temperature range of 0°C to +70°C.

Feature Summary

• AutoShutdown technology reduces supply current to 1µA when no valid RS-232 signal is detected for 30µs, enabling power savings without BIOS modifications.
• Integrated dual charge pump generates internal ±5.5V rails from a single low-voltage supply using only four small capacitors.
• Enhanced electrostatic discharge protection ensures robustness against ±15kV Human Body Model and ±8kV IEC 1000-4-2 Contact Discharge events.

Applications

• Notebook, subnotebook, and palmtop computers
• Battery-powered equipment and handheld devices
• Cellular phones and peripherals

Procurement Notes

Verify the specific ordering suffixes against the manufacturer's official documentation to confirm exact package type, lead finish, and temperature rating. Confirm that the requested part number matches the intended application requirements before finalizing procurement orders.

Selection Notes

Select this component for applications requiring low-power RS-232 communication in space-constrained environments. Ensure the system design accommodates the required external capacitors for the charge pump and verify compatibility with the target logic voltage levels.

Part Context

This device belongs to the MAX3221E/MAX3223E/MAX3243E family of 3V-powered RS-232 transceivers. It shares core features like AutoShutdown and high ESD protection with its siblings but offers a higher channel count (3 drivers/5 receivers) suitable for complete serial port implementations.

Replacement Considerations

Public confirmed substitute part numbers include MAX3243ECDB and MAX3243ECDWR.

FAQ

How does the AutoShutdown feature function?

When FORCEON is low and FORCEOFF is high, the device enters AutoShutdown mode. If no valid RS-232 signal levels are detected on all receiver inputs for 30µs, the onboard charge pump and drivers shut off, reducing supply current to 1µA.

What is the purpose of the R2OUTB pin on the MAX3243E?

R2OUTB is an always-active noninverting complementary receiver output. It allows external devices to be monitored without forward biasing the protection diodes in circuitry that may be powered down.

Can the MAX3243E drive serial mice?

Yes, the MAX3243E has been specifically designed to drive serial mice. However, the AutoShutdown feature must be disabled by connecting FORCEOFF and FORCEON to VCC to ensure continuous operation.