MAX3140EEI+T

Controllers Overview

The MAX3140EEI+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 from 300 baud to 230k baud. The UART contains an 8-word-deep receive FIFO. The integrated transceiver supports data rates of 115kbps, 500kbps, and 10Mbps via programmable slew rate limiting. Typical supply current is 645µA with the receiver active, reducing to 20µA in hardware shutdown mode.

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 suffix EEI confirms the extended temperature range of -40°C to +85°C and the QSOP-28 package type. Confirm RoHS compliance status through official manufacturer documentation or authorized distributor certificates. Ensure ordering specifications match the required operational environment and pin configuration before procurement.

Controllers Selection Notes

Select this component when space-constrained designs require both UART logic and RS-485/RS-422 physical layer transmission. Verify that the system requires a 5V supply and benefits from the integrated fail-safe receiver. Consider the 10Mbps maximum data rate capability if high-speed communication over twisted-pair lines is necessary within the specified temperature range.

Controllers Part Context

The MAX3140EEI+T belongs to the MAX3140 series, which integrates UART functionality with RS-485/RS-422 transceivers. It is hardware and software compatible with the MAX3100 and MAX3089. The EEI suffix denotes the industrial temperature grade (-40°C to +85°C), distinguishing it from the CEI variant which covers the commercial range (0°C to +70°C). Both share the same 28-pin QSOP footprint.

Controllers Replacement Considerations

MAX3140CEI+