ADM8324WCA29ARJZR7

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). 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). 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

Key features

• 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