Maxim Integrated MAX6743XKSHD3 Microprocessor Supervisory Circuit

The Maxim Integrated MAX6743XKSHD3 is a compact, highly reliable microprocessor (µP) supervisory circuit designed to monitor power supplies in µP and digital systems. It provides excellent circuit reliability and low cost by eliminating external components and adjustments when monitoring nominal system voltages from 1.575V to 5V.

This supervisory circuit is ideal for portable and battery-powered equipment due to its low power consumption and small footprint. The MAX6743XKSHD3 ensures that the µP is reset to a known state during power-up, power-down, or brown-out conditions. The reset output remains asserted for a minimum of 140ms after VCC has risen above the reset threshold, ensuring a proper system reset.

The device features a factory-trimmed reset threshold voltage, which provides high accuracy without the need for external resistors. The MAX6743XKSHD3 has an open-drain reset output stage, enabling it to interface directly with a variety of microprocessors and digital systems. The open-drain design allows for OR'ing of multiple supervisory circuits to monitor different voltages or to provide a system-wide reset.

Key features of the MAX6743XKSHD3 include:

• Factory-trimmed VCC reset threshold voltages
• Low supply current of 7.5µA (typical)
• Guaranteed reset valid to VCC = 1V
• Minimum 140ms reset pulse width
• Immune to short VCC transients
• Open-drain reset output
• Manual reset capability

The MAX6743XKSHD3 is available in a small SOT23 package, making it easy to integrate into space-constrained designs. Its operating temperature range of -40°C to +125°C allows for deployment in a wide range of environmental conditions.

Whether you're designing an advanced digital system that requires reliable voltage monitoring or a portable device that demands low power consumption and compact size, the Maxim Integrated MAX6743XKSHD3 is an excellent choice for ensuring system stability and performance.