MAX3243ECAI

Overview

The MAX3243ECAI is a full-duplex RS-232 transceiver manufactured by Analog Devices Inc./Maxim Integrated. It integrates three drivers and five receivers, operating on a single +3.0V to +5.5V supply. The device supports data rates up to 250kbps with a propagation delay of 0.15µs. It features AutoShutdown technology that reduces supply current to 1µA when no valid signal is detected. ESD protection is rated at ±15kV (HBM), ±8kV (Contact Discharge), and ±15kV (Air-Gap). The component operates within a temperature range of -40°C to +85°C and is housed in a 28-pin SSOP package.

Feature Summary

• Integrates three line drivers and five line receivers for complete serial port functionality.
• Features AutoShutdown technology to reduce power consumption to 1µA during idle states.
• Provides enhanced electrostatic discharge protection on all I/O pins.

Applications

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

Procurement Notes

Verify the specific ordering suffix 'CAI' against the manufacturer's official selector guide to confirm the exact pin count, package type, and temperature rating. Ensure compatibility with the required voltage levels and interface standards before finalizing procurement orders.

Selection Notes

Select this component for applications requiring multiple transmit and receive channels within a compact footprint. Consider the 250kbps data rate limit and the specific -40°C to +85°C operating range. Verify that the external capacitor requirements align with the system's space and cost constraints.

Part Context

This part belongs to the MAX3221E/MAX3223E/MAX3243E family of low-power RS-232 transceivers. While sharing core technologies like AutoShutdown and dual charge pumps, it differs from siblings by offering a higher channel count (3Tx/5Rx) compared to the 1Tx/1Rx or 2Tx/2Rx variants.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.

FAQ

How does the AutoShutdown feature function?

AutoShutdown disables the onboard charge pump and drivers when no valid RS-232 signal levels are detected on receiver inputs for 30µs, reducing supply current to 1µA. The device reactivates upon detecting a valid signal.

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

R2OUTB is an always-active noninverting complementary receiver output. It allows monitoring of receiver activity, such as Ring Indicator signals, even when other receivers are in a high-impedance shutdown state.

Does the MAX3243E support mouse driveability?

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