ADM8324

RECOMMENDED FOR NEW DESIGNS

Supervisory Circuit with Windowed Watchdog, Manual Reset, and Active-Low Open-Drain Reset Output

Data Sheet (Rev. B) Product Selection Table

Part Models: 3
1ku List Price: Starting From $0.85

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Overview

Windowed watchdog, 8 timeout options
26 reset threshold options
- 2.5 V to 5 V in 100 mV increments
4 reset timeout options
- 1 ms, 20 ms, 140 ms, and 1120 ms (minimum)
Manual reset input
Open-drain or push-pull RESET outputs
Low power consumption
Specified over wide temperature range (−40°C to +125°C)
Qualified for automotive applications
5-lead SOT-23 package

The ADM8323/ADM8324 are supervisory circuits that monitor power supply voltage levels and code execution integrity in microprocessor-based systems. An on-chip watchdog timer checks for activity within a preset timeout window. A reset signal can also be asserted by an external push-button switch through a manual reset input. The RESET output is either push-pull (ADM8323) or open-drain (ADM8324).

A watchdog failure results in a low output on the RESET pin. A failure can be triggered either by a fast watchdog error (watchdog pulses too close together) or by a slow watchdog error (no watchdog pulse within the timeout period). This effectively gives a window to observe the watchdog pulse. The watchdog timeout is measured from the last falling edge of the watchdog input (WDI). There are eight different watchdog windows available, as shown in Table 5.

Each device is available in a choice of 26 reset threshold options from 2.5 V to 5 V in 100 mV increments. There are also four reset timeout options of 1 ms, 20 ms, 140 ms, and 1120 ms (minimum). Not all device options are available as standard models. See the Ordering Guide for details.

The ADM8323/ADM8324 are available in a 5-lead SOT-23 package and typically consume only 10 μA, making them suitable for use in low power portable applications.

Applications

Automotive
Microprocessor systems
Computers
Controllers
Intelligent instruments
Portable equipment

Part Models: 3
1ku List Price: Starting From $0.85

Documentation

Data Sheet 1

ADM8323/ADM8324: Supervisory Circuits with Windowed Watchdog and Manual Reset in 5-Lead SOT-23 Data Sheet (Rev.B) 11/04/2013

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
ADM8324WAH29ARJZR7	5-Lead SOT-23	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
ADM8324WCA29ARJZR7	5-Lead SOT-23	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
ADM8324WCA46ARJZR7	5-Lead SOT-23	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

This is the most up-to-date revision of the Data Sheet.

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