ADM6822: Low Voltage Supervisory Circuit with Watchdog, Manual Reset and Active-Low, Open-Drain Reset Output
The ADM6821-ADM6825 are supervisory circuits which monitor power supply voltage levels and code execution integrity in microprocessor-based systems. As well as providing power-on-reset signals, an ...More
ADM6822: Low Voltage Supervisory Circuit with Watchdog, Manual Reset and Active-Low, Open-Drain Reset Output
Product Description
The ADM6821-ADM6825 are supervisory circuits which 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 three parts feature different combinations of watchdog input, manual reset input and output stage configuration, as shown in table 1.
Each part is available in a choice of 9 reset threshold options ranging from 1.58V to 4.63V. The reset and watchdog timeout periods are fixed at 140ms (min) and 1.6s (typ), respectively.
The ADM6821-ADM6825 are available in 5-lead SOT-23 packages and typically consume only 3µA, making them suitable for use in low power portable applications.
Quick Links
- Data Sheet Rev 0, 10/2005, (pdf, 232 kB)
- (About Data Sheets)
- Lead(Pb) - Free Data
Features
- Precision Low Voltage Monitoring down to 1.8V
- 9 Reset Threshold Options: 1.58V to 4.63V
- 140ms (Min) Reset Timeout
- Manual Reset Input
- Reset Output Stages: Open-Drain Active-Low
- Low Power Consumption (3µA)
- Guaranteed Reset Output valid to VCC=1V
- Power Supply Glitch Immunity
- Specified from -40°C to +125°C
- 5-Lead SOT-23 Package
Diagrams
- Enlarge
- Other Diagrams
- Symbols and Footprints
Functional Block Diagram for ADM6822
Low Voltage Supervisory Circuit with Watchdog, Manual Reset and Active-Low, Open-Drain Reset Output
Other Diagrams for ADM6822
Low Voltage Supervisory Circuit with Watchdog, Manual Reset and Active-Low, Open-Drain Reset Output
ADM6822 Pin Configuration
Functional Block Diagram for ADM6822
AD5100 - System-Management IC with Programmable Quad Voltage Monitoring and Supervisory Functions
| Part# | Reset Threshold (V) | Min Reset Timeout (ms) | Reset Output-Stage | Manual Reset Capability | Typ Watchdog Timeout (ms) | Power Fail Indicator | Package | Product Description | Price* (1000-4999) |
|---|---|---|---|---|---|---|---|---|---|
| AD5100 | Adjustable | Adj | Active-Low/Push-Pull | Yes | adj. | Yes | SOP | System-Mgmt IC with Programmable Quad Voltage Monitoring and Supervisory Functions | - |
| ADM1232 | 4.37, 4.62 | 250 | Active-High/Push-Pull, Active-Low/Open-Drain | Yes | 250, 500, 62.5 | No | DIP, SOIC, SOP | Microprocessor Supervisory Circuit | $0.94 |
| ADM13305 | 0.6, 1.68, 2.25, 2.93, 4.55, Adjustable | 140 | Active-High/Push-Pull, Active-Low/Push-Pull | Yes | 1.6 | - | SOIC | Multi-Voltage Supervisory Circuit | $0.95 |
| ADM6316 | 2.5, 2.63, 2.7, 2.8, 2.93, 3.0, 3.08, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4.0, 4.1, 4.2, 4.3, 4.39, 4.5, 4.63, 4.7, 4.8, 4.9, 5.0 | 1, 1,200, 140, 20 | Active-Low/Push-Pull | Yes | 102, 1,600, 25,600, 6.3 | No | SOT | Supervisory Ckt w/ Watchdog, Manual Reset & Active-Low, Push-Pull Reset Output in 5-Lead SOT-23 | $0.50 |
| ADM6318 | 2.5, 2.63, 2.7, 2.8, 2.93, 3.0, 3.08, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4.0, 4.1, 4.2, 4.3, 4.39, 4.5, 4.63, 4.7, 4.8, 4.9, 5.0 | 1, 1,200, 140, 20 | Active-High/Push-Pull, Active-Low/Push-Pull | No | 102, 1,600, 25,600, 6.3 | No | SOT | Supervisory Circuit with Watchdog and Dual Active-Low/Active-High Push-Pull Reset Outputs | $0.50 |
| ADM6320 | 2.5, 2.63, 2.7, 2.8, 2.93, 3.0, 3.08, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4.0, 4.1, 4.2, 4.3, 4.39, 4.5, 4.63, 4.7, 4.8, 4.9, 5.0 | 1, 1,200, 140, 20 | Active-Low/Open-Drain | Yes | 102, 1,600, 25,600, 6.3 | No | SOT | Supervisory Circuit with Watchdog, Manual Reset & Active-Low, Open-Drain Reset Output | $0.50 |
| ADM6321 | 2.5, 2.63, 2.7, 2.8, 2.93, 3.0, 3.08, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4.0, 4.1, 4.2, 4.3, 4.39, 4.5, 4.63, 4.7, 4.8, 4.9, 5.0 | 1, 1,200, 140, 20 | Active-High/Push-Pull, Active-Low/Open-Drain | No | 102, 1,600, 25,600, 6.3 | No | SOT | Supervisory Circuit with Watchdog and Dual Active-Low Open-Drain/Active-High Push-Pull Reset Outputs | $0.50 |
| ADM6821 | 1.58, 1.67, 2.19, 2.32, 2.63, 2.93, 3.08, 4.38, 4.63 | 140 | Active-High/Push-Pull | Yes | 1,600 | No | SOT | Low Voltage Supervisory Circuit w/ Watchdog, Manual Reset and Active-High, Push-Pull Reset Output | - |
| ADM6822 | 1.58, 1.67, 2.19, 2.32, 2.63, 2.93, 3.08, 4.38, 4.63 | 140 | Active-Low/Open-Drain | Yes | 1,600 | No | SOT | Low Voltage Supervisory Circuit w/ Watchdog, Manual Reset and Open-Drain Reset Output | - |
| ADM6823 | 1.58, 1.67, 2.19, 2.32, 2.63, 2.93, 3.08, 4.38, 4.63 | 140 | Active-Low/Push-Pull | Yes | 1,600 | No | SOT | Low Voltage Supervisory Circuit w/ Watchdog, Manual Reset and Active-Low, Push-Pull Reset Output | $0.75 |
| ADM6824 | 1.58, 1.67, 2.19, 2.32, 2.63, 2.93, 3.08, 4.38, 4.63 | 140 | Active-High/Push-Pull, Active-Low/Push-Pull | No | 1,600 | No | SOT | Low Voltage Supervisory Circuit w/ Watchdog, Manual Reset, Active-Hi & Low Push-Pull Reset Output | - |
| ADM699 | 4.65 | 140 | Active-High/Push-Pull, Active-Low/Push-Pull | No | 1,600 | No | DIP, SOIC | µP Supv w/ Watchdog, 4.65V Trip Point, Low Supply Current and Active Low Reset Output | $1.66 |
| ADM705 | 4.65 | 160 | Active-Low/Push-Pull | Yes | 1,600 | Yes | DIP, SOIC | µP Supv w/ 4.65V Trip Voltage, Watchdog, Pwr Fail, Manual Reset & Active Low Reset Output | $1.01 |
| ADM706 | 4.4 | 160 | Active-Low/Push-Pull | Yes | 1,600 | Yes | DIP, SOIC | +3V, Voltage Monitoring µP Supervisory Circuit | $1.68 |
| ADM823 | 2.19, 2.32, 2.63, 2.93, 3.08, 4.38, 4.63 | 140 | Active-Low/Push-Pull | Yes | 1,600 | No | SC70, SOT | Supervisory Circuit with Watchdog, Manual Reset and Active-Low, Push-Pull Reset Output | $0.50 |
| ADM824 | 2.19, 2.32, 2.63, 2.93, 3.08, 4.38, 4.63 | 140 | Active-High/Push-Pull, Active-Low/Push-Pull | No | 1,600 | No | SC70, SOT | Supervisory Circuit with Watchdog, Active-High &-Low Push-Pull Reset Output | $0.50 |
| ADM8616 | 1.58, 1.67, 2.19, 2.32, 2.63, 2.93, 3.08, 4.38, 4.63 | 1, 1,120, 140, 20 | Active-Low/Push-Pull | No | 102, 1,600, 6.3 | No | SC70 | Low Voltage Supervisory Circuit w/ Watchdog and Active-Low, Push-Pull Reset Output--- in 4-Lead SC70 | $0.85 |
| ADM8617 | 1.58, 1.67, 2.19, 2.32, 2.63, 2.93, 3.08, 4.38, 4.63 | 1, 1,120, 140, 20 | Active-Low/Open-Drain | No | 102, 1,600, 6.3 | No | SC70 | Low Voltage Supervisory Circuit w/ Watchdog & active-low open-drain output in 4-Lead SC70 | $0.85 |
| ADM8699 | 4.65 | 140 | Active-High/Push-Pull, Active-Low/Push-Pull | No | 1,600 | No | DIP, SOIC | µP Supervisory Circuit with Watchdog, 4.65V Trip Point | $1.99 |
| ADM9690 | 4.31 | 10 typ, 50 typ | Active-Low/Push-Pull | No | 0.75, 1.5, 12.5, 25 | No | SOIC | Power Supply and Watchdog Timer Monitoring Circuit | $1.50 |
* The pricing listed here is provided only for budgetary purposes as recommended list price in U.S.
Dollars in the United States ex factor per unit for the stated volume. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
** Pricing is currently unavailable. Click on the product number to see the Product Page for additional information.