MAX3140CEI+T

Controllers Overview

The MAX3140CEI+T is a complete universal asynchronous receiver-transmitter (UART) and true fail-safe RS-485/RS-422 transceiver combined in a single 28-pin QSOP package. It operates from a single +5V supply with a voltage range of 4.75V to 5.25V. The device features an SPI/MICROWIRE-compatible serial interface, saving microcontroller I/O pins. It includes an oscillator circuit derived from an external crystal and a baud-rate generator supporting rates up to 230k baud. The UART contains an 8-word-deep receive FIFO. The RS-485/RS-422 transceiver offers programmable slew rates for maximum data rates of 115kbps, 500kbps, and 10Mbps. The operating temperature range for the CEI suffix is 0°C to +70°C.

Controllers Feature Summary

• Integrated UART and RS-485/RS-422 Transceiver in a Single 28-Pin QSOP
• SPI/MICROWIRE-Compatible Interface Saves µC I/O Pins
• True Fail-Safe Receiver Output Eliminates Complex Network Termination
• Pin-Programmable RS-485/RS-422 Features

Controllers Applications

• Industrial-Control Transceivers for EMI-Sensitive Applications
• HVAC and Building Control Embedded Systems
• Point-of-Sale Devices
• Intelligent Instrumentation

Controllers Procurement Notes

Verify the specific CEI suffix indicates the commercial temperature range of 0°C to +70°C against the EEI suffix which covers -40°C to +85°C. Confirm the reel packaging format matches system requirements. Ensure the lead-free/RoHS-compliant status aligns with environmental regulations. Cross-reference the manufacturer part number with authorized distributor listings to confirm authenticity and current availability status before finalizing procurement orders.

Controllers Selection Notes

Select this component when space and power constraints require combining UART logic with RS-485/RS-422 physical layer capabilities. The pin-programmable nature allows flexible configuration for half or full-duplex operation without additional hardware changes. Consider the available slew-rate options if electromagnetic interference mitigation is critical for the specific bus topology. Verify that the required baud rates fall within the supported ranges defined by the external crystal frequency.

Controllers Part Context

The MAX3140 series integrates functions typically requiring separate components, reducing board space. It is hardware and software compatible with the MAX3100 and MAX3089, allowing for potential design flexibility or migration paths. The device serves as a compact solution for embedded systems needing robust serial communication over twisted-pair balanced lines while maintaining low power consumption through dedicated shutdown modes.

Controllers Replacement Considerations

Public confirmed substitute part numbers are not provided in the source material.