Overview
The ADM706AN, produced by Analog Devices Inc., is a low-cost microprocessor supervisory circuit designed to monitor 5 V power supplies and microprocessor activity. This component is part of the ADM705/ADM706/ADM707/ADM708 family and is particularly useful in ensuring the reliable operation of microprocessors during power-up, power-down, and brownout conditions.
The ADM706AN provides essential features such as power-supply monitoring, independent watchdog timer functionality, and manual reset capabilities, making it a superior upgrade for older supervisory circuits like the MAX705 to MAX708 series.
Key Specifications
| Parameter | Rating/Value | Conditions |
|---|---|---|
| VCC | −0.3 V to +6 V | TA = 25°C |
| All Other Inputs | −0.3 V to VCC + 0.3 V | TA = 25°C |
| Input Current VCC | 20 mA | TA = 25°C |
| Digital Output Current | 20 mA | TA = 25°C |
| Power Dissipation, N-8 PDIP | 727 mW | TA = 25°C |
| Thermal Impedance, N-8 PDIP | 135°C/W | TA = 25°C |
| Operating Temperature Range | −40°C to +85°C | Industrial (Version A) |
| Watchdog Timeout Period | 1.60 sec | VIL = 0.4 V, VIH = VCC × 0.8 |
| Reset Threshold Monitor Level | 4.40 V | |
| Power-Fail Input Threshold | 1.2 V to 1.3 V |
Key Features
- Power-Supply Monitoring: Generates a reset output during power-up, power-down, and brownout conditions. The reset output remains operational with VCC as low as 1 V.
- Independent Watchdog Timer: Activated if the watchdog input has not been toggled within 1.60 seconds.
- Manual Reset Input (MR): Active low, debounced manual reset input that can be driven from TTL, CMOS logic, or a manual reset switch.
- Power-Fail Input (PFI): Monitors power failures or low battery conditions with a 1.25 V threshold detector.
- Reset Output: Active low reset output (RESET) with an additional active high reset output available in the ADM707 and ADM708 models.
- Package Options: Available in 8-lead PDIP (N-8) and SOIC (R-8) packages, with the ADM708 also available in an MSOP (RM-8) package.
Applications
- Microprocessor Systems: Ensures reliable operation of microprocessors.
- Computers and Controllers: Suitable for monitoring power supplies in computer systems and control units.
- Intelligent Instruments: Used in critical microprocessor supply monitoring for intelligent instruments.
- Automotive Systems: Critical microprocessor power monitoring in automotive applications.
Q & A
- What is the primary function of the ADM706AN?
The primary function of the ADM706AN is to monitor 5 V power supplies and microprocessor activity, generating reset outputs during power-up, power-down, and brownout conditions.
- What is the watchdog timeout period for the ADM706AN?
The watchdog timeout period for the ADM706AN is 1.60 seconds.
- What are the package options available for the ADM706AN?
The ADM706AN is available in 8-lead PDIP (N-8) and SOIC (R-8) packages.
- What is the reset threshold monitor level for the ADM706AN?
The reset threshold monitor level for the ADM706AN is 4.40 V.
- What is the purpose of the power-fail input (PFI) in the ADM706AN?
The power-fail input (PFI) monitors power failures or low battery conditions with a 1.25 V threshold detector.
- Can the ADM706AN be used in automotive systems?
- What is the operating temperature range for the ADM706AN?
The operating temperature range for the ADM706AN is −40°C to +85°C.
- Does the ADM706AN have an active high reset output?
No, the ADM706AN has an active low reset output. However, the ADM707 and ADM708 models provide both active low and active high reset outputs.
- How is the manual reset input (MR) on the ADM706AN configured?
The manual reset input (MR) is an active low, debounced input that can be driven from TTL, CMOS logic, or a manual reset switch.
- What is the maximum power dissipation for the ADM706AN in an N-8 PDIP package?
The maximum power dissipation for the ADM706AN in an N-8 PDIP package is 727 mW.
