ADM6316AZ29ARJZ-R7

Supervisors Overview

The ADM6316AZ29ARJZ-R7 is a supervisory circuit from Analog Devices Inc. designed to monitor power supply voltage levels and code execution integrity in microprocessor-based systems. It provides power-on reset signals and features an on-chip watchdog timer that resets the processor if it fails to strobe within a preset timeout period. The device includes a manual reset input for external assertion of reset signals. Key electrical parameters include a reset threshold voltage of 2.9 V, low power consumption of 5 μA, and guaranteed reset output validity down to VCC = 1 V. It operates over an industrial temperature range and is housed in a 5-lead SOT-23 package.

Supervisors Feature Summary

• Integrated watchdog timer monitors code execution integrity and triggers a reset if the processor fails to strobe within a specified timeout period.
• Manual reset input allows external assertion of a reset signal via a push button or other external logic.
• Provides power-on reset functionality with glitch immunity to ensure stable operation during power supply transitions.

Supervisors Applications

• Microprocessor systems
• Controllers
• Intelligent instruments

Supervisors Procurement Notes

Verify the specific suffix 'R7' indicates tape and reel packaging when ordering. Confirm the 'AZ' variant corresponds to the 2.9 V threshold and required output stage configuration. Check for RoHS compliance status as indicated by the 'Z' suffix in similar family members. Ensure the industrial temperature range meets application requirements. Validate pinout compatibility with existing PCB layouts before procurement.

Supervisors Selection Notes

Select this component when a fixed 2.9 V reset threshold is required for monitoring lower voltage rails. The inclusion of a manual reset input makes it suitable for systems requiring user-initiated resets. Consider the 5 μA quiescent current for battery-powered applications. Verify that the available watchdog timeout options align with the system's maximum allowable recovery time. Ensure the output stage configuration matches the microprocessor's reset input requirements.

Supervisors Part Context

This part belongs to the ADM6316/ADM6317/ADM6318/ADM6319/ADM6320/ADM6321/ADM6322 family of supervisory circuits. These devices share common features such as watchdog timers and manual reset inputs but differ in output stage configurations and threshold voltages. The ADM6316 specifically offers a push-pull active-low reset output. The family is designed for compact designs using the 5-lead SOT-23 package.

Supervisors Replacement Considerations

Direct replacements within the same family include ADM6316 variants with different threshold voltages (e.g., ADM6316AX47ARJZ-R7 for 4.7 V). Cross-family replacements like ADPL62086 offer similar supervision but may have different interface protocols or voltage ranges. Verify pin-to-pin compatibility and electrical specifications before substitution.

Supervisors FAQ

What is the function of the WDI pin?

The WDI (Watchdog Input) pin is used to strobe the internal watchdog timer. If the processor fails to toggle this pin within the preset timeout period, the device will assert a reset signal.

Can the reset signal be manually triggered?

Yes, the device includes a Manual Reset (MR) input that allows an external signal, such as a push button, to assert the reset output regardless of the power supply voltage or watchdog status.

What is the minimum operating voltage for valid reset output?

The reset output is guaranteed to be valid down to a supply voltage (VCC) of 1 V, ensuring reliable supervision even as the power supply drops.