MAX3223EUP+

Overview

The MAX3223EUP+ is a dual-driver, dual-receiver RS-232 transceiver in a 20-pin TSSOP package. It operates from a single +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 supports data rates up to 120kbps (typical 235kbps) with a propagation delay of 0.3µs. Internal dual charge pumps generate ±5.5V using four 0.1µF capacitors at 3.3V operation. It includes an INVALID output indicating active shutdown status.

Feature Summary

• AutoShutdown technology reduces power consumption by disabling internal power supplies and drivers when receiver inputs are inactive.
• Integrated dual charge pump circuitry eliminates the need for external ±12V supplies or inductors.
• Provides true RS-232 performance directly from a single low-voltage power source.

Applications

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

Procurement Notes

Verify that the component matches the specific Analog Devices/Maxim Integrated part number MAX3223EUP+. Confirm the suffix indicates RoHS compliance as per manufacturer documentation. Ensure the package type is identified as 20-TSSOP. Cross-reference the datasheet revision to confirm electrical characteristics align with design requirements before procurement.

Selection Notes

Select this component for applications requiring low-power RS-232 communication powered by a single 3.3V or 5V rail. The AutoShutdown feature is critical for battery-operated systems where standby current must be minimized. Verify that the required data rate does not exceed the guaranteed 120kbps limit under worst-case loading conditions.

Part Context

This device belongs to the MAX3221/MAX3223/MAX3243 family of 3V-powered EIA/TIA-232 transceivers. While the MAX3221 offers one driver/receiver and the MAX3243 provides three drivers and five receivers, the MAX3223 specifically provides two drivers and two receivers in a 20-pin package format.

Replacement Considerations

The MAX3223EAP serves as a pin-compatible alternative in a 20-pin SSOP package. Other family members like the MAX3221 or MAX3243 offer different channel counts but share similar operational principles and power management features.

FAQ

How does the AutoShutdown feature function?

When FORCEON is low and FORCEOFF is high, the device shuts down if no valid RS-32 levels are present on all receiver inputs for 30µs, 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 through C4.

What is the purpose of the INVALID output?

The INVALID output indicates the status of the receiver inputs; it is high when the device is active and low when the device is in shutdown mode.