MAX3221CAE

Overview

The MAX3221CAE is a single-driver, single-receiver RS-232 transceiver manufactured by Analog Devices Inc./Maxim Integrated. It operates from a +3.0V to +5.5V supply and achieves 1µA supply current via the AutoShutdown feature when no valid signal is detected on receiver inputs for 30µs. The device utilizes a proprietary dual charge pump to generate true RS-232 levels without requiring external ±12V supplies. It supports data rates up to 235kbps with 0.1µF capacitors in 3.3V operation. The component is housed in a 16-pin SSOP package and functions within an operating temperature range of 0°C to +70°C.

Feature Summary

• AutoShutdown technology reduces power consumption by disabling onboard power supplies and drivers when no valid RS-232 signal is present at receiver inputs.
• Integrated high-efficiency dual charge-pump circuitry generates required voltage levels from a single low-voltage supply, eliminating the need for external negative voltage sources.
• Provides enhanced electrostatic discharge protection on all transmitter outputs and receiver inputs.

Applications

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

Procurement Notes

Verify the specific ordering suffix against official manufacturer documentation to confirm package type and temperature range. Confirm RoHS compliance status through authorized distributors or direct manufacturer channels. Ensure the source document matches the exact part number to avoid discrepancies in electrical characteristics or pin configurations.

Selection Notes

Select this component for applications requiring minimal quiescent current during idle periods. Verify that the system logic levels are compatible with the specified input thresholds. Ensure adequate decoupling capacitors are placed near the IC to support the internal charge pump operation effectively.

Part Context

This part belongs to the MAX3221/MAX3223/MAX3243 family of 3V-powered RS-232 transceivers. The MAX3221 variant specifically provides one driver and one receiver configuration. Other family members offer increased channel counts while maintaining similar power management features and interface standards.

Replacement Considerations

MAX3221CUE (16-pin TSSOP)

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 level is detected for 30µs, the onboard power supply and drivers shut down, reducing supply current to 1µA.

What capacitor values are required for 3.3V operation?

For 3.3V operation, the datasheet specifies using 0.1µF capacitors for C1, C2, C3, and C4.

Can the MAX3221CAE operate directly from a battery?

Yes, the device operates from a single +3.0V to +5.5V supply, making it suitable for direct connection to battery-powered systems without additional voltage regulation for the interface.