MAX3224ECPP+

Overview

The MAX3224ECPP+ is a lead-free, RoHS-compliant RS-232 transceiver manufactured by Analog Devices (Maxim Integrated). It operates on a single +3.0V to +5.5V supply and features AutoShutdown Plus technology for ultra-low power consumption. The device includes two drivers and two receivers with guaranteed data rates of up to 250kbps. It provides enhanced ESD protection rated at ±15kV via the Human Body Model and ±8kV via IEC Contact Discharge. The component utilizes a dual charge pump requiring only four 0.1µF capacitors and is housed in a 20-pin Plastic DIP package.

Feature Summary

• AutoShutdown Plus functionality automatically reduces supply current to 1µA when the interface is inactive or disconnected.
• Integrated dual charge pump generates internal +5.5V and -5.5V rails using minimal external capacitance.
• Enhanced electrostatic discharge protection ensures robustness against high-voltage static events on all I/O pins.
• Logic-level READY output indicates when the internal charge pumps are regulating and the device is ready for transmission.

Applications

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

Procurement Notes

Verify that the ordering suffix CPP+ corresponds specifically to the 20-pin Plastic DIP package variant. Confirm the temperature range matches the EC designation (0°C to +70°C) rather than the EE designation (-40°C to +85°C). Ensure compliance with RoHS standards is documented for the specific manufacturing lot prior to integration into production designs.

Selection Notes

Select this component when a through-hole DIP package is required for prototyping or legacy board layouts. The MAX3224E variant is appropriate for applications requiring 250kbps data rates; choose MAX3225E variants if 1Mbps speeds are necessary. Verify that the system voltage remains within the 3.0V to 5.5V range to ensure proper charge pump operation and signal integrity.

Part Context

This part belongs to the MAX3224E–MAX3227E/MAX3244E/MAX3245E family of 3V-powered RS-232 transceivers. The family shares common features including AutoShutdown Plus and ±15kV ESD protection. Variants differ primarily in driver/receiver counts and maximum data rates, while package options include TQFN, SSOP, TSSOP, and Plastic DIP configurations.

Replacement Considerations

Public confirmed substitute part numbers: MAX3224EEPP+, MAX3224ECAP+, MAX3224ECTP+, MAX3224EEUP+, MAX3224ECUP+, MAX3224EEAP+, MAX3224EAAP+. These parts share identical electrical specifications but differ in operating temperature ranges or physical package types.

FAQ

How does the AutoShutdown Plus feature reduce power consumption?

The device enters a low-power shutdown mode when the RS-232 cable is disconnected or when transmitter inputs remain inactive for more than 30 seconds. Supply current drops to 1µA during this state.

What is the function of the INVALID output pin?

The INVALID output goes low when no valid RS-232 voltage levels are detected on any receiver input. It indicates the presence or absence of a valid signal independent of the FORCEON and FORCEOFF states.

What external components are required for the charge pump?

The device requires four small 0.1µF capacitors connected to the C1+, C1-, C2+, and C2- pins to generate the internal +5.5V and -5.5V supplies from the VCC input.