Maxim Integrated MAX6468US22D3+ Microprocessor Reset Circuit
The MAX6468US22D3+ is a compact, highly reliable microprocessor (µP) supervisory circuit designed by Maxim Integrated to monitor power supplies in digital systems. It provides a significant layer of protection by ensuring that the µP and its peripherals are reset properly during power-up, power-down, or brown-out conditions. This device is particularly well-suited for portable and battery-powered applications due to its low power consumption and small footprint.
With a factory-trimmed reset threshold voltage of 2.2V, the MAX6468US22D3+ is optimized for 2.5V-powered systems, although it can be used in systems with different supply voltages within its operating range. The device asserts a reset signal whenever the VCC supply voltage falls below the preset threshold, keeping the reset active for a minimum of 140ms after VCC has risen above the reset threshold. This ensures that the system has sufficient time to stabilize before normal operation resumes.
The MAX6468US22D3+ features an active-low, push-pull reset output. The push-pull configuration eliminates the need for an external pull-up resistor, which can be beneficial in cost and space-sensitive designs. This device is also characterized by its immunity to short VCC transients, safeguarding the system against spurious resets that might otherwise be triggered by brief dips in the power supply.
Engineered for versatility, the MAX6468US22D3+ supports a wide operating temperature range from -40°C to +125°C, making it suitable for industrial applications where temperature extremes are common. Its tiny SOT-23 package allows for integration into designs where board space is at a premium.
Key features of the MAX6468US22D3+ include:
- Factory-trimmed VCC reset threshold of 2.2V
- Low 5.5µA supply current
- Guaranteed reset valid to VCC = 1V
- 140ms min reset pulse width
- Immunity to short VCC transients
- Active-low, push-pull reset output
- Wide operating temperature range of -40°C to +125°C
- Compact SOT-23 packaging
Overall, the MAX6468US22D3+ from Maxim Integrated is a reliable and efficient solution for system monitoring, offering enhanced system stability and protection in a variety of applications.
