ADM708RANZ

Supervisors Overview

The ADM708RANZ is a microprocessor supervisory circuit designed for monitoring 5 V power supplies and batteries. It features an active high reset output with a guaranteed valid state at VCC = 1 V. The device includes a precision voltage monitor set at 4.40 V, a debounced manual reset input (MR), and a watchdog timer with a 1.60-second timeout. It operates within a supply voltage range of 2.5 V to 5.5 V, drawing a typical quiescent current of 190 μA. The component supports push-pull outputs and functions across an industrial temperature range of -40°C to +85°C.

Supervisors Feature Summary

• Provides active high reset signals with guaranteed validity down to 1 V supply voltage
• Integrates a debounced manual reset input compatible with TTL/CMOS logic levels
• Includes an independent watchdog timer with a fixed 1.60-second timeout period
• Offers low quiescent current consumption suitable for battery-powered applications

Supervisors Applications

• Microprocessor systems requiring critical supply monitoring
• Computers and controllers needing power-fail detection
• Intelligent instruments with low battery warning requirements

Supervisors Procurement Notes

Verify the specific suffix RANZ against official Analog Devices documentation to confirm package type and temperature grade. Confirm end-of-life status as distribution channels may list obsolete inventory. Ensure compatibility with existing PCB footprints and thermal management requirements before procurement.

Supervisors Selection Notes

Select this component when an active high reset output is required for system initialization. The integrated watchdog timer simplifies design compared to variants lacking this feature. Verify that the 4.40 V threshold aligns with the monitored rail's nominal voltage. Consider the SOIC-8 package constraints for surface-mount assembly processes.

Supervisors Part Context

The ADM708 belongs to the ADM705-ADM708 family of low-cost supervisory circuits from Analog Devices. These devices serve as superior upgrades to legacy MAX705-MAX708 parts. The family provides essential protection for digital systems by detecting power anomalies and ensuring proper processor reset sequences during startup or fault conditions.

Supervisors Replacement Considerations

• MAX708CPA+
• MAX708EPA+