Overview
The ADM708TAR is a microprocessor supervisory circuit produced by Analog Devices Inc. This component is designed to monitor and manage power supply conditions, ensuring reliable operation of microprocessor systems. It features precision supply voltage monitoring, a watchdog timer, and reset functions to handle power failures and low battery conditions.
Key Specifications
| Parameter | Min | Typ | Max | Unit | Test Conditions/Comments |
|---|---|---|---|---|---|
| Operating Voltage Range (VCC) | 1.0 | 5.5 | V | ||
| Supply Current | 100 | 200 | 350 | μA | VCC < 3.6 V and VCC < 5.5 V respectively |
| Reset Threshold (VRST) | 3.00 | 3.08 | 3.15 | V | For ADM708T |
| Reset Threshold Hysteresis | 20 | mV | |||
| Reset Pulse Width | 160 | 200 | 280 | ms | |
| Watchdog Timeout Period | 1.00 | 1.60 | 2.25 | sec | Note: Not applicable for ADM708 series |
| Manual Reset Input (MR) Threshold | 0.6 | V | Logic Low | ||
| Manual Reset Input (MR) Pull-Up Current | 70 | μA |
Key Features
- Precision supply voltage monitoring with thresholds of 2.63 V, 2.93 V, and 3.08 V for different models.
- Low quiescent current of 100 μA to 200 μA.
- Debounced manual reset input (MR) compatible with TTL/CMOS logic.
- Independent watchdog timer (not available in ADM708 series).
- Active high and active low reset outputs.
- Power-fail input (PFI) and power-fail output (PFO) for low battery or power failure detection.
Applications
- Microprocessor systems
- Computers and controllers
- Intelligent instruments
- Critical microprocessor supply monitoring
Q & A
- What is the primary function of the ADM708TAR?
The primary function is to monitor the power supply voltage and provide reset and watchdog functions to ensure reliable operation of microprocessor systems. - What are the available reset threshold voltages for the ADM708 series?
The reset threshold voltages are 2.63 V, 2.93 V, and 3.08 V for different models within the series. - What is the quiescent current of the ADM708TAR?
The quiescent current ranges from 100 μA to 200 μA depending on the VCC voltage. - Does the ADM708TAR have a watchdog timer function?
No, the ADM708 series does not include a watchdog timer function. - What types of reset outputs are available on the ADM708TAR?
The ADM708TAR provides both active high and active low reset outputs. - What is the purpose of the manual reset input (MR)?
The manual reset input (MR) allows for a manual reset of the system when it is taken below 0.6 V and is internally debounced to prevent false triggers. - In what packages is the ADM708TAR available?
The ADM708TAR is available in narrow 8-lead PDIP and 8-lead SOIC packages. - What is the operating voltage range of the ADM708TAR?
The operating voltage range is from 1.0 V to 5.5 V. - How does the power-fail input (PFI) work?
The power-fail input (PFI) detects low battery or power failure conditions and generates a corresponding output signal. - Is the ADM708TAR suitable for monitoring 5 V power supplies?
Yes, it is suitable for monitoring 5 V power supplies and batteries.
