MAX3100ETG+

Controllers Overview

The MAX3100ETG+ is a universal asynchronous receiver transmitter (UART) optimized for small microcontroller-based systems, featuring an SPI/MICROWIRE-compatible interface. It supports data rates up to 230k baud using a 3.6864MHz crystal and includes a software-programmable baud-rate generator. The device incorporates an 8-word FIFO buffer to minimize processor overhead and operates on a supply voltage ranging from +2.7V to +5.5V. Quiescent current is reduced to 10µA in shutdown mode with receive activity detection. It is housed in a 24-pin TQFN-EP package and functions within the -40°C to +85°C extended temperature range.

Controllers Feature Summary

• SPI/MICROWIRE-Compatible µC Interface
• Lowest Power: 150µA Operating Current at 3.3V; 10µA in Shutdown with Receive Interrupt
• +2.7V to +5.5V Supply Voltage in Operating Mode
• Schmitt-Trigger Inputs for Opto-Couplers

Controllers Applications

• Handheld Instruments
• Intelligent Instrumentation
• UART in SPI Systems
• Small Networks in HVAC or Building Control
• Isolated RS-232/RS-485: Directly Drives Opto-Couplers

Controllers Procurement Notes

Verify the specific ordering suffix ETG+ corresponds to the 24-pin TQFN-EP package and the -40°C to +85°C industrial temperature range. Confirm that the component is lead-free and RoHS-compliant as indicated by the plus sign in the part number. Ensure compatibility with the required host microcontroller's SPI or Microwire protocol before procurement.

Controllers Selection Notes

Select this component when a compact UART solution is needed for microcontrollers with limited serial ports. The choice of the 24-pin TQFN-EP package suits space-constrained designs requiring surface-mount technology. Consider the 8-word FIFO depth and interrupt capabilities if minimizing processor intervention during high-speed data transfers is a priority.

Controllers Part Context

The MAX3100 series provides UART functionality via a synchronous serial interface, bridging the gap between standard microcontrollers and asynchronous communication protocols. The ETG+ variant specifically utilizes the 24-pin Thin Quad Flatpack with Exposed Pad, offering thermal advantages and a smaller footprint compared to traditional DIP or QSOP packages in the same family.

Controllers Replacement Considerations

MAX3100CPD+

Controllers FAQ

How does the MAX3100 handle power consumption during idle periods?

The device features a software- or hardware-invoked shutdown mode that lowers quiescent current to 10µA while still allowing the MAX3100 to detect receiver activity on the RX pin.

What types of crystals are recommended for baud-rate generation?

Standard baud rates can be achieved using either a 1.8432MHz or a 3.6864MHz crystal. Ceramic resonators are also supported as low-cost alternatives, though they offer lower accuracy and Q factors.

Can the MAX3100 directly drive opto-couplers?

Yes, the TX and RTS outputs can sink 25mA, and the device includes Schmitt-trigger inputs, making it suitable for directly driving opto-couplers in isolated RS-232 or RS-485 applications.