ADM823SYRJZ-R7 Integrated Circuits (ICs)

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1. DESCRIPTION

The ADM823SYRJZ-R7 are supervisory circuits that monitor power supply voltage levels and code execution integrity in microprocessor-based systems. In addition to providing power-on reset signals, an on-chip watchdog timer can reset the microprocessor if it fails to strobe within a preset timeout period. A reset signal can also be asserted by an external pushbutton, through a manual reset input. The three parts feature different combinations of watchdog input, manual reset input, and output stage configuration.These parts are available in a choice of seven reset threshold options ranging from 2.19 V to 4.63 V. The reset and watchdog timeout periods are fixed at 140 ms (minimum) and 1.6 sec (typical), respectively. The ADM823SYRJZ-R7 are available in 5-lead SC70 and SOT-23 packages and typically consume only 5 µA, making them suitable for use in low power, portable applications.

2. FEATURES

    1. Precision 2.5 V to 5 V power supply monitor 

    2. 7 reset threshold options: 2.19V to 4.63 V

    3. 140 ms (minimum) reset timeout

    4. Watchdog timer with 1.6 sec timeout (ADM823, ADM824)

    5. Manual reset input (ADM823, ADM825)

    6. Push-pull output stages

    7. RESET (ADM823)

    8. RESET, RESET (ADM824/ADM825)

    9. Low power consumption: 5 µA

  10. Guaranteed reset output valid to VCC = 1 V

  11. Power supply glitch immunity

  12. Specified over automotive temperature range

  13. 5-lead SC70 and SOT-23 packages

3. APPLICATIONS

    1. Microprocessor systems

    2. Computers

    3. Controllers

    4. Intelligent instruments

    5. Portable equipment