MAX6351SYUT

Overview

The MAX6351SYUT is a dual-channel microprocessor supervisor IC from Maxim Integrated, designed to monitor two separate voltage supplies. It features active-low push-pull reset outputs referenced to VCC1 and VCC2, ensuring system reliability by asserting resets if input voltages drop below preset thresholds. The device includes a debounced manual reset input and maintains valid outputs as long as either supply exceeds +1.0V. It operates over an extended temperature range of -40°C to +85°C and is available in 5- and 6-pin SOT23 packages.

Feature Summary

• Dual-channel precision monitoring for multiple power-supply voltages
• Active-low push-pull reset outputs referenced to respective supply rails
• Debounced TTL/CMOS-compatible manual-reset input
• Factory-set power-supply reset thresholds with minimum 100ms power-on reset pulse width

Applications

• Microprocessor system supervision
• Multi-voltage power management circuits
• Embedded systems requiring reliable reset sequencing

Procurement Notes

Verify the specific voltage threshold suffix (e.g., SYUT) against the required monitoring levels, as the MAX6351 series offers various factory-set options. Confirm package type availability, noting that some variants may be offered in 5-pin or 6-pin SOT23 configurations. Ensure compatibility with the target operating temperature range of -40°C to +85°C. Cross-reference the manufacturer part number with authorized distributors to confirm authenticity and current production status.

Selection Notes

Select this component when simultaneous monitoring of two distinct voltage rails is required for system stability. The dual-output architecture allows independent referencing to VCC1 and VCC2, simplifying design compared to discrete solutions. Consider the 20µA supply current for low-power applications. Verify that the 100ms minimum reset timeout meets the startup requirements of the connected microprocessor or logic components.

Part Context

The MAX6351 belongs to the MAX6351–MAX6360 family of microprocessor supervisors. This series improves system reliability and accuracy by integrating multiple reset functions into a single IC, replacing separate components. While other devices in the series offer watchdog timers or additional voltage monitors, the MAX6351 specifically focuses on dual-channel supervision with dedicated reset outputs for each monitored rail.

FAQ

What is the reference voltage for the reset outputs?

The MAX6351 provides two active-low, push-pull reset outputs: one referenced to VCC1 and the other referenced to VCC2.

How does the device handle low input voltages?

If any input supply voltage drops below its associated preset threshold, all reset outputs are asserted. Outputs remain valid as long as either supply voltage remains greater than +1.0V.