ADM699: Microprocessor Supervisory Circuits
The ADM698/ADM699 supervisory circuits provide power supply monitoring and watchdog timing for microprocessor systems.
The ADM698 monitors the 5 V VCC power supply and generates a ...More
ADM699: Microprocessor Supervisory Circuits
Product Description
The ADM698/ADM699 supervisory circuits provide power supply monitoring and watchdog timing for microprocessor systems.
The ADM698 monitors the 5 V VCC power supply and generates a RESET pulse during power up, power down and during low voltage "Brown Out" conditions. The RESET output is guaranteed to be functional (logic low) with VCC as low as 1 V.
The ADM699 features an identical monitoring circuit as in the ADM698 plus an additional watchdog timer input to monitor microprocessor activity. The RESET output is forced low if the watchdog input is not toggled within the 1 second watchdog timeout period.
Both parts are available in 8-pin plastic DIP and 16-lead SOIC packages. The 16-lead SOIC contains additional outputs RESET (without inversion) and Watchdog Output WDO (ADM699 only).
- Data Sheet Rev 0, 10/2002 (pdf 256kB)
- (About Data Sheets)
Features
- Superior Upgrade for MAX698/MAX699
- Guaranteed RESET Assertion with VCC = 1 V
- Low 0.6 mA Supply Current
- Precision 4.65 V Voltage Monitor
- Power OK/Reset Time Delay
- Watchdog Timer
- Minimum Component Count
- Performance Specified over Temperature
Diagrams
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- Symbols and Footprints
Functional Block Diagram for ADM699
Microprocessor Supervisory Circuits
Functional Block Diagram for ADM699
AD5100 - System-Management IC with Programmable Quad Voltage Monitoring and Supervisory Functions
| Part# | Reset Threshold Summary | Min Reset Timeout (ms) | Reset Output-Stage | Manual Reset Capability | Typ Watchdog Timeout (ms) | Power Fail Indicator | Package | Product Description | Price* (1000-4999) |
|---|---|---|---|---|---|---|---|---|---|
| AD5100 | Programmable | Adj | Active-Low/Push-Pull | Yes | adj. | Yes | SOP | System-Mgmt IC with Programmable Quad Voltage Monitoring and Supervisory Functions | $1.60 |
| ADM1232 | 4.37V & 4.62V | 250 | Active-High/Push-Pull, Active-Low/Open-Drain | Yes | 250, 500, 62.5 | No | DIP, SOIC, SOP | Microprocessor Supervisory Circuit | $0.95 |
| ADM13305 | 5 Options--0.6Adj to 4.55 | 140 | Active-High/Push-Pull, Active-Low/Push-Pull | Yes | 1.6 | - | SOIC | Dual Processor Supervisor with Watchdog | $0.96 |
| ADM6316 | 26 Options--2.5 to 5V | 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 | $0.51 |
| ADM6318 | 26 Options--2.5 to 5V | 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 | 26 Options--2.5 to 5V | 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 | $0.51 |
| ADM6321 | 26 Options--2.5 to 5V | 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 | $0.51 |
| ADM6821 | 9 Options--1.58 to 4.63V | 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 | 9 Options--1.58 to 4.63V | 140 | Active-Low/Open-Drain | Yes | 1,600 | No | SOT | Low Voltage Supervisory Circuit w/ Watchdog, Manual Reset and Open-Drain Reset Output | - |
| ADM6823 | 9 Options--1.58 to 4.63V | 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 | $0.76 |
| ADM6824 | 9 Options--1.58 to 4.63V | 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 | 4.65V | 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 | $1.68 |
| ADM705 | 4.65V | 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 | $1.02 |
| ADM706 | 4.4V | 160 | Active-Low/Push-Pull | Yes | 1,600 | Yes | DIP, SOIC | +3V, Voltage Monitoring µP Supervisory Circuit | $1.70 |
| ADM823 | 7 Options--2.19 to 4.63V | 140 | Active-Low/Push-Pull | Yes | 1,600 | No | SC70, SOT | Supervisory Circuit with Watchdog, Manual |