MIC1815-20UY-TR

Supervisors Overview

The MIC1815-20UY-TR is a microprocessor supervisory circuit manufactured by Microchip Technology, designed to monitor power supplies in embedded systems. It features a precision voltage monitor calibrated for a 20% drop threshold in 3.3V power supplies. The device asserts a reset signal if the supply voltage falls below the designated level, ensuring system stability. Key electrical parameters include a minimum supply current of 5µA and a reset pulse width of at least 100ms. The /RESET output remains valid down to VCC as low as 1V. It operates within an industrial temperature range and requires no external components for basic functionality.

Supervisors Feature Summary

• Precision voltage monitoring specifically configured for 20% drops in 3.3V systems
• Maintains valid reset output with supply voltage as low as 1V
• Ultra-low supply current consumption of 5µA
• Requires no external components for operation

Supervisors Applications

• Portable equipment requiring reliable power supervision
• Intelligent instruments needing critical power monitoring
• Embedded controllers in microprocessor-based systems
• Printers and computers with strict reset timing requirements

Supervisors Procurement Notes

Verify the manufacturer origin carefully, as the MIC1815 series was originally developed by Micrel Semiconductor before its acquisition by Microchip Technology. Ensure the datasheet corresponds to the specific 20% threshold variant (MIC1815-20) rather than the 10% version. Confirm the package type matches the SOT-23-3 form factor indicated by the suffix. Cross-reference the revision history to ensure compatibility with current design specifications.

Supervisors Selection Notes

Select this component when a dedicated supervisor IC is required for 3.3V logic systems with a tolerance for up to 20% voltage sag. It is suitable for applications where minimal quiescent current is critical for battery life or efficiency. Compare against general-purpose comparators if additional hysteresis or window monitoring functions are needed, as this part provides a fixed threshold response. Consider the 100ms reset delay when designing startup sequences for sensitive peripherals.

Supervisors Part Context

This part belongs to the MIC1815 family of supervisory circuits, originally introduced by Micrel. The '20' designation indicates the specific reset threshold percentage relative to the nominal 3.3V rail. The '-TR' suffix denotes tape and reel packaging for automated assembly. This family serves as a cost-effective solution for basic brown-out detection without the complexity of programmable supervisors.

Supervisors Replacement Considerations

• MIC1815-10UY-TR (10% threshold variant)
• TS803R (Taiwan Semiconductor equivalent)
• TS3809 (Taiwan Semiconductor alternative)