ADM8320WBX3NARJZR7

Supervisors Overview

The ADM8320WBX3NARJZR7 is a supervisory circuit manufactured by Analog Devices Inc., designed for monitoring single voltage rails in electronic systems. It features an open-drain active-low reset output and includes a built-in watchdog timer with manual reset capability. The device operates within a supply voltage range of 1.0 V to 5.5 V, offering 26 selectable reset threshold options from 2.5 V to 5.0 V in 100 mV increments. It provides four configurable reset timeout options (1 ms, 20 ms, 140 ms, and 1120 ms) and four watchdog timeout options (6.3 ms, 102 ms, 1600 ms, and 25.6 s). The component consumes low power, typically 5 μA, and guarantees reset validity down to VCC = 1 V. It is housed in a compact 5-lead SOT-23 package and supports industrial temperature ranges.

Supervisors Feature Summary

• Integrates a windowed watchdog timer with manual reset input for enhanced system reliability
• Provides 26 factory-set reset threshold voltages ranging from 2.5 V to 5.0 V
• Features open-drain active-low reset output compatible with various logic families
• Ensures power supply glitch immunity and valid reset signals down to 1 V

Supervisors Applications

• Portable battery-powered equipment requiring low standby current
• Industrial control systems needing robust power supervision
• Automotive electronics applications demanding high reliability
• Embedded systems with microcontrollers requiring watchdog protection

Supervisors Procurement Notes

Verify the exact suffix '3NA' against the official Analog Devices datasheet to confirm the specific reset threshold voltage and timeout configuration, as these parameters vary across the ADM8320 family. Ensure compatibility with the target PCB footprint for the SOT-23-5 package. Confirm that the open-drain output architecture aligns with the pull-up requirements of the monitored system's logic interface. Check for RoHS compliance status if environmental regulations apply to the end product.

Supervisors Selection Notes

Select this component when a single-channel supervisor with integrated watchdog functionality is required. The choice depends on matching the specific reset threshold voltage to the monitored rail and ensuring the watchdog timeout meets the processor's service interval. Consider the open-drain output if level shifting or shared interrupt lines are needed. Evaluate the low quiescent current benefit for battery-operated designs where minimizing standby drain is critical for extended operational life.

Supervisors Part Context

The ADM8320 series belongs to Analog Devices' line of supervisory circuits designed for power management applications. These devices monitor voltage levels and provide reset signals to protect sensitive electronics from brownouts or overvoltage conditions. The inclusion of a watchdog timer distinguishes this part from basic supervisors, allowing it to detect software hangs or processor failures. The SOT-23-5 packaging enables space-constrained designs while maintaining performance across wide temperature ranges suitable for industrial and automotive environments.

Supervisors Replacement Considerations

ADM8320WCY3NARJZR7: Offers similar specifications with potentially different manufacturing lot or minor parameter variations; verify threshold accuracy. ADM8320WCA3NARJZR7: Alternative variant within the same family; ensure pinout and electrical characteristics match the design requirements before substitution.