MAX3223ECAP

Overview

The MAX3223ECAP is a dual-driver, dual-receiver RS-232 transceiver in a 20-pin SSOP package. It operates from a single +3.0V to +5.5V supply and achieves 1µA supply current via AutoShutdown when no valid signal is detected on receiver inputs for 30µs. The device guarantees a 120kbps data rate with worst-case loads of 3kΩ parallel 1000pF, typically supporting up to 235kbps. It features ±15kV ESD protection on all pins, integrated dual charge pumps requiring only 0.1µF capacitors at 3.3V, and an INVALID output indicating shutdown status.

Feature Summary

• AutoShutdown feature reduces supply current to 1µA when no valid RS-232 signal is present on receiver inputs for 30µs
• Integrated dual charge pump eliminates the need for external ±12V supplies by generating internal V+ and V- rails
• Provides ±15kV electrostatic discharge (ESD) protection on all RS-232 bus pins
• INVALID output pin indicates whether the device is in normal operation or low-power shutdown mode

Applications

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

Procurement Notes

Verify the specific suffix 'CAP' corresponds to the 20-pin SSOP package and -40°C to +85°C temperature range as listed in the manufacturer's ordering guide. Confirm RoHS compliance status through official documentation, as packaging suffixes may indicate environmental certifications without altering electrical function. Cross-reference the manufacturer part number with authorized distributors to ensure authenticity and traceability.

Selection Notes

Select this component for designs requiring low power consumption in standby states due to the AutoShutdown capability. Ensure the application logic voltage is compatible with the specified input thresholds for 3.3V or 5V systems. Verify that the required data rate does not exceed the guaranteed 120kbps under worst-case loading conditions. Consider the 20-pin SSOP footprint constraints during PCB layout planning.

Part Context

The MAX3223ECAP belongs to the MAX3221/MAX3223/MAX3243 family of 3V-powered RS-232 transceivers. While the MAX3221 offers one driver/receiver in a 16-pin package, and the MAX3243 provides three drivers and five receivers in a 28-pin package, the MAX3223 specifically provides two drivers and two receivers. All variants share the same core AutoShutdown technology and charge pump architecture.

Replacement Considerations

MAX3223EAP

FAQ

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

The device enters AutoShutdown mode when FORCEON is low and FORCEOFF is high, and no valid RS-232 signal levels are detected on any receiver input for a duration of 30µs.

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.

What is the function of the INVALID output pin?

The INVALID output is high when the device is in normal operation and low when the device is in shutdown mode, indicating the status of the receiver inputs.