MAX3235ECPP

Overview

The MAX3235ECPP is a dual RS-232 transceiver manufactured by Analog Devices Inc. (Maxim Integrated), housed in a 20-pin Plastic Dual In-Line Package (PDIP). It operates from a single +4.5V to +5.5V power supply and supports data rates up to 250kbps. The device integrates internal charge-pump capacitors, eliminating the need for external components. Key electrical specifications include a propagation delay of 0.15µs, a typical operating supply current of 1mA with AutoShutdown Plus enabled, and ESD protection rated at ±15kV via the Human Body Model.

Feature Summary

• AutoShutdown Plus technology automatically reduces supply current to 1µA when the cable is disconnected or peripheral transmitters are inactive.
• Integrated internal charge-pump circuitry removes the requirement for external flying capacitors.
• Enhanced electrostatic discharge protection on all I/O pins ensures robustness against high-voltage events.

Applications

• Subnotebook and palm-top computers requiring low-power serial communication interfaces.
• Portable battery-powered instruments utilizing RS-232 connectivity.
• Industrial control systems needing reliable data transmission with enhanced noise immunity.

Procurement Notes

Verify the specific suffix designation, as the MAX3235ECPP indicates a PDIP package variant which may differ from the more common SOIC versions found in some databases. Confirm RoHS compliance status and check for end-of-life notifications, as older Maxim part numbers often face discontinuation. Ensure the supplier provides original manufacturer documentation to validate authenticity before purchase.

Selection Notes

Select this component when a through-hole PDIP package is required for prototyping or legacy board designs. Compare against the MAX3233E if a lower voltage operation near 3.3V is needed, noting that the MAX3235E is optimized for 5V supplies. Verify that the 250kbps data rate meets the system requirements, as higher-speed alternatives exist within the same family.

Part Context

This device belongs to the MAX323x series of low-power RS-232 transceivers. It shares functional similarities with the MAX3233E but differs in its recommended operating supply voltage range. The series is characterized by its ability to operate from a single supply while generating the necessary positive and negative voltages for RS-232 signaling internally.

Replacement Considerations

The MAX3233ECPP is a pin-compatible alternative designed for 3.3V operation. For surface-mount replacements, consider the MAX3235ECWP. Verify that any substitute maintains the same PDIP-20 footprint and electrical characteristics suitable for 5V logic levels.