Overview
The ADM708TARZ is a supervisory circuit produced by Analog Devices Inc., designed to monitor and protect microprocessor systems from power failures and other anomalies. This component is part of the ADM708 series, which offers advanced features for supply voltage monitoring, watchdog timer functionality, and manual reset capabilities. The ADM708TARZ is available in an 8-lead SOIC package and operates over a wide temperature range of -40°C to +85°C.
Key Specifications
| Parameter | Min | Typ | Max | Unit | Test Conditions/Comments |
|---|---|---|---|---|---|
| VCC Operating Voltage Range | 1.0 | 5.5 | V | ||
| Supply Current | 100 | 200 | 350 | μA | VCC < 3.6 V, VCC < 5.5 V |
| Reset Threshold (VRST) | 2.85 | 2.93 | 3.00 | V | ADM708S |
| Reset Threshold Hysteresis | 20 | mV | |||
| Reset Pulse Width | 160 | 200 | 280 | ms | VCC = 3 V to 5.5 V |
| Watchdog Timeout Period | 1.00 | 1.60 | 2.25 | sec | Not applicable for ADM708 series |
| Manual Reset Input (MR) Pulse Width | 150 | ns | VCC < 3.6 V, VCC < 5.5 V | ||
| Power-Fail Input (PFI) Threshold | 1.2 | 1.25 | 1.3 | V | |
| Operating Temperature Range | -40 | +85 | °C |
Key Features
- Precision Supply Voltage Monitoring: The ADM708TARZ monitors supply voltages with thresholds of 2.63 V, 2.93 V, and 3.08 V, depending on the specific model variant.
- Low Quiescent Current: The device operates with a quiescent current of 100 μA to 350 μA, depending on the VCC voltage.
- Debounced Manual Reset Input: The manual reset input (MR) is debounced to prevent spurious resets.
- Active High and Active Low Reset Outputs: The ADM708TARZ provides both active high and active low reset outputs, offering flexibility in system design.
- Power-Fail Input and Output: The device includes a power-fail input (PFI) and output (PFO) for low battery or power fail warnings.
Applications
- Microprocessor Systems: Ideal for monitoring and protecting microprocessors in various applications.
- Computers and Controllers: Used in computer systems, industrial controllers, and other critical control systems.
- Intelligent Instruments: Suitable for use in intelligent instruments that require reliable power monitoring and reset functions.
- Critical Microprocessor Supply Monitoring: Essential for ensuring the reliability and stability of microprocessor-based systems.
Q & A
- What is the operating temperature range of the ADM708TARZ?
The operating temperature range is -40°C to +85°C.
- What are the reset threshold voltages for the ADM708TARZ?
The reset threshold voltages are 2.63 V, 2.93 V, and 3.08 V, depending on the model variant.
- Does the ADM708TARZ have a watchdog timer function?
No, the ADM708 series does not include a watchdog timer function; instead, it provides an additional active high reset output.
- What is the quiescent current of the ADM708TARZ?
The quiescent current is 100 μA to 350 μA, depending on the VCC voltage.
- What types of packages are available for the ADM708TARZ?
The device is available in 8-lead PDIP and 8-lead SOIC packages.
- What is the purpose of the power-fail input (PFI) and output (PFO)?
The PFI and PFO are used for low battery or power fail warnings.
- Is the manual reset input (MR) debounced?
- What are the typical applications of the ADM708TARZ?
Typical applications include microprocessor systems, computers, controllers, and intelligent instruments.
- What is the reset pulse width of the ADM708TARZ?
The reset pulse width is 160 ms to 280 ms.
- Does the ADM708TARZ have both active high and active low reset outputs?
