ADM6821: Low Voltage Supervisory Circuit with Watchdog, Manual Reset and Active-High, Push-Pull Reset Output
The ADM682x are supervisory circuits that monitor power supply voltage levels and code execution integrity in microprocessor-based systems. As well as 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 means of an external push-button through a manual reset input. The parts feature different combinations of watchdog input and manual reset input and output stage configurations, as shown in Table 1 in the data sheet.
Each part is available in nine reset threshold options, ranging from 1.58 V to 4.63 V. The reset and watchdog timeout periods are fixed at 140 ms (min) and 1.6 sec (typ), respectively. The ADM682x are available in 5-lead SOT-23 packages and typically consume only 7 μA, making them suitable for use in low power, portable applications.
产品应用领域 Applications
- Microprocessor Systems
- Computers
- Controllers
- Intelligent Instruments
- Portable Equipment
ADM6821 特点
- Precision Low Voltage Monitoring
- 9 Reset Threshold Options: 1.58 V to 4.63 V
- 140 ms (min) Reset Timeout
- Watchdog Timer with 1.6 sec Timeout
- Reset Output Stages
Push-pull Active-low
Open-drain Active-low
Push-pull Active-high - Manual Reset Input
- Low Power Consumption (7 μA)
- Guaranteed Reset Output Valid to VCC = 1 V
- Power Supply Glitch Immunity
- Specified from -40°C to +125°C
- 5-lead SOT-23 Package
ADM6821 功能框图
