MAX6340UK28+

Overview

The MAX6340UK28+T is a CMOS microprocessor supervisory circuit manufactured by Analog Devices Inc./Maxim Integrated. It monitors a single power supply input and asserts an active-low, open-drain reset signal when the voltage falls below the factory-set threshold of 2.8V. The device guarantees valid reset output down to VCC = 1V and features a fixed reset timeout delay of 4.375 ms. It operates within a supply current range typical for low-power applications and is housed in a compact SOT-23-5 surface-mount package.

Feature Summary

• Monitors a single power supply rail with a fixed 2.8V threshold
• Asserts active-low open-drain reset signal upon undervoltage detection
• Guarantees valid reset assertion down to 1V supply voltage
• Immune to short transients on the monitored supply line

Applications

• Microprocessor (µP) system reset circuits
• Portable battery-powered electronic devices
• Personal computer power supply monitoring
• Embedded systems requiring reliable power supervision

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm RoHS compliance status and lead-free specifications against the latest datasheet revision. Check for obsolescence notices or lifecycle changes from Analog Devices. Ensure the specific suffix matches the required package and electrical characteristics for your design integration.

Selection Notes

Select this component when a fixed 2.8V threshold is required for single-supply monitoring. Consider the SOT-23-5 package for space-constrained PCB layouts. Evaluate the 4.375 ms reset delay against system startup requirements. Compare supply current consumption with other supervisory ICs if low-power operation is critical for the application.

Part Context

The MAX6340 belongs to the Maxim Integrated MAX63xx series of microprocessor supervisory circuits. This family provides various reset thresholds and timeout periods in small packages. The UK28 variant specifically denotes the 2.8V threshold version. These circuits are designed to replace discrete resistor divider and comparator solutions, simplifying board design and improving reliability in digital systems.

Replacement Considerations

• MAX6340UK28+T
• MAX6340UK28D2+T

FAQ

What is the minimum supply voltage at which the reset signal remains valid?

The reset output is guaranteed to be valid down to a supply voltage (VCC) of 1V.

Does the MAX6340UK28+ include a manual reset input pin?

No, the MAX6340 does not feature a manual reset input; it only responds to power supply voltage levels.

What is the reset timeout delay for this specific part number?

The fixed reset timeout delay for the MAX6340 is 4.375 milliseconds.