MAX3111ECNI

Controllers Overview

The MAX3111ECNI is a single-chip universal asynchronous receiver/transmitter (UART) combined with an RS-232 transceiver, housed in a 28-pin plastic DIP package. Designed for +3.0V to +3.6V operation, it features integrated charge-pump capacitors and ±15kV ESD protection on the RS-232 lines. The device supports data rates up to 230kbps and includes an SPI/QSPI/MICROWIRE-compatible serial interface. It operates within a commercial temperature range of 0°C to +70°C.

Controllers Feature Summary

• Integrates a full-featured UART and RS-232 transceiver into a single 28-pin package to reduce board space and component count.
• Features internal charge-pump capacitors that eliminate the need for external components to generate RS-232 voltage levels.
• Includes an SPI/QSPI/MICROWIRE-compatible serial interface to minimize microcontroller I/O pin usage.
• Provides true RS-232 performance down to a +3V supply while maintaining low power consumption.

Controllers Applications

• Point-of-Sale (POS) Devices
• Handy-Terminals
• Telecom/Networking Diagnostic Ports
• Industrial Front-Panel Interfaces
• Hand-Held/Battery-Powered Equipment

Controllers Procurement Notes

Verify the specific suffix 'ECNI' corresponds to the 28-pin Plastic DIP package and the 0°C to +70°C commercial temperature range. Confirm the device is sourced from Analog Devices Inc./Maxim Integrated. Ensure the ordering information matches the exact part number to avoid confusion with the SOIC variant or the +5V MAX3110E model.

Controllers Selection Notes

Select the MAX3111ECNI when a +3.3V single-supply system requires RS-232 communication without external charge-pump components. This part is suitable for applications where board space is limited and a plastic DIP package is preferred over surface mount. Verify that the required operating temperature falls within the 0°C to +70°C commercial range.

Controllers Part Context

The MAX3111ECNI belongs to the MAX3110E/MAX3111E family, which combines UART functionality with RS-232 transceivers. While the MAX3110E operates at +5V, the MAX3111E is optimized for +3.3V systems. Both share hardware and software compatibility with legacy parts like the MAX3100 and MAX3222E.

Controllers Replacement Considerations

The MAX3110ECNI serves as a direct replacement if the application can support a +5V supply instead of +3.3V. For surface-mount requirements, the MAX3111ECWI offers identical electrical characteristics in a 28-Wide SO package.

Controllers FAQ

Does the MAX3111ECNI require external capacitors for the RS-232 charge pump?

No, the MAX3111ECNI integrates the charge-pump capacitors internally, eliminating the need for external components.

What is the maximum data rate supported by this device?

The device is guaranteed to operate at data rates up to 230kbps while maintaining true EIA/TIA-232 output voltage levels.

How does the MAX3111ECNI handle ESD protection?

The RS-232 transceivers feature ±15kV ESD protection on both the transmitter outputs and receiver inputs according to the IEC 1000-4-2 standard.