MAX3243EEAI+C9V

Overview

The MAX3243EEAI+C9V is an RS-232 transceiver from the MAX3243E series, manufactured by Analog Devices Inc./Maxim Integrated. It features three drivers and five receivers with full-duplex communication capability. The device operates on a supply voltage range of +3.0V to +5.5V and supports data rates up to 250kbps. It incorporates AutoShutdown technology to achieve a typical supply current of 1µA when no valid signal is detected. ESD protection is rated at ±15kV (Human Body Model), ±8kV (Contact Discharge), and ±15kV (Air-Gap). The component is housed in a 28-pin SSOP package and functions within an operating temperature range of -40°C to +85°C.

Feature Summary

• AutoShutdown feature reduces supply current to 1µA upon detecting invalid RS-232 signal levels for 30µs.
• Integrated dual charge pump generates internal +5.5V and -5.5V supplies using four external 0.1µF capacitors.
• Includes two noninverting complementary receiver outputs that remain active during shutdown to monitor peripherals without forward biasing protection diodes.

Applications

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

Procurement Notes

Verify the specific ordering suffix C9V against official manufacturer documentation to confirm packaging or tape-and-reel specifications. Ensure compatibility with the required 28-pin SSOP footprint and validate that the -40°C to +85°C industrial temperature rating meets system environmental requirements before finalizing procurement.

Selection Notes

Select this component for applications requiring low-power standby modes via AutoShutdown. It is suitable for systems needing three transmit and five receive channels. Verify that the external capacitor values align with the +3.0V to +5.5V supply voltage to ensure proper charge pump operation and RS-232 output levels.

Part Context

This part belongs to the MAX3221E/MAX3223E/MAX3243E family of true RS-232 transceivers. While the MAX3221E offers one driver/receiver and the MAX3223E provides two, the MAX3243E variant delivers a complete serial port interface with three drivers and five receivers, making it ideal for complex notebook or subnotebook computer interfaces.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material.

FAQ

How does the AutoShutdown feature function?

When FORCEON is low and FORCEOFF is high, the device monitors receiver inputs. If no valid RS-232 signal levels are detected for 30µs, the charge pump and drivers shut off, reducing supply current to 1µA. The device wakes up when a valid level is applied.

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

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

What ESD protection ratings does the device support?

The device supports ±15kV Human Body Model, ±8kV IEC 1000-4-2 Contact Discharge, and ±15kV IEC 1000-4-2 Air-Gap Discharge protection.