MAX3224ECAP+

Overview

The MAX3224ECAP+ is a dual RS-232 transceiver manufactured by Analog Devices (Maxim Integrated). It operates on a single +3.0V to +5.5V supply and guarantees a data rate of 250kbps. The device features AutoShutdown Plus technology, achieving a typical supply current of 1μA during inactivity. It includes two drivers and two receivers with full-duplex communication capability. ESD protection is rated at ±15kV for human body model and air-gap discharge. The component is housed in a 20-pin SSOP package and supports an operating temperature range of 0°C to +70°C.

Feature Summary

• AutoShutdown Plus functionality automatically reduces power consumption when the interface is idle or disconnected.
• Integrated dual charge pump generates internal voltage rails using only four small external capacitors.
• Enhanced electrostatic discharge protection ensures robustness against high-voltage static events.

Applications

• Notebook, subnotebook, and palmtop computers
• Cellular phones and battery-powered equipment
• Hand-held devices and peripherals such as printers

Procurement Notes

Verify that the specific suffix 'CAP+' corresponds to the 20-pin SSOP package and industrial temperature range (0°C to +70°C) required for your design. Confirm RoHS compliance status through official manufacturer documentation before finalizing procurement orders.

Selection Notes

Select this component when designing low-power RS-232 interfaces requiring automatic power management without BIOS modifications. Ensure the application environment remains within the specified 0°C to +70°C operational limits and utilizes a 3.0V to 5.5V power supply.

Part Context

This part belongs to the MAX3224E/MAX3225E/MAX3226E/MAX3227E family of 3V-powered RS-232 transceivers. While other variants in the series support higher data rates up to 1Mbps, the MAX3224E specifically guarantees 250kbps operation. The family shares common features like AutoShutdown Plus and ±15kV ESD protection.

Replacement Considerations

Direct pin-compatible replacements within the same family include MAX3224ECTP+, MAX3224ECUP+, and MAX3224ECPP+. For extended temperature ranges, consider MAX3224EEAP+ (-40°C to +85°C) or MAX3224EAAP+ (-40°C to +125°C).

FAQ

How does the AutoShutdown Plus feature function?

The device enters a low-power shutdown mode when no valid signal transition is detected on any receiver or transmitter input for more than 30 seconds. It wakes up automatically upon sensing a valid transition.

What is the purpose of the READY output pin?

The READY output asserts high when the internal charge pumps are regulating and the device is ready to begin transmitting. It goes low when the charge pumps are disabled in shutdown mode.

What external components are required for operation?

The device requires four small 0.1μF capacitors for the dual charge pump to operate from a 3.3V supply. Specific capacitor values may vary depending on the supply voltage.