Overview
The ADM705ARZ-REEL, produced by Analog Devices Inc., is a microprocessor supervisory circuit designed to monitor 5 V power supplies and microprocessor activity. This device is part of the ADM705/ADM706/ADM707/ADM708 family, which provides essential functions for ensuring the reliable operation of microprocessors. The ADM705 specifically includes power-supply monitoring circuitry, a watchdog timer, and a manual reset input, making it suitable for a variety of applications requiring robust power management and system supervision.
Key Specifications
| Parameter | Min | Typ | Max | Unit | Test Conditions/Comments |
|---|---|---|---|---|---|
| VCC Operating Voltage Range | 1.0 | 5.5 | V | ||
| Supply Current | 190 | 250 | µA | VCC = 4.75 V to 5.5 V, TA = TMIN to TMAX | |
| Reset Threshold (ADM705) | 4.5 | 4.65 | 4.75 | V | |
| Reset Threshold Hysteresis | 40 mV | ||||
| Reset Pulse Width | 160 | 200 | 280 | ms | |
| Reset Output Voltage (ISOURCE = 800 µA) | 0.4 V | VCC - 1.5 V | |||
| Operating Temperature Range | -40°C | +85°C | Industrial (Version A) | ||
| Storage Temperature Range | -65°C | +150°C |
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.
- Watchdog Timer: Independent watchdog monitoring circuitry is activated if the watchdog input has not been toggled within 1.60 seconds.
- Manual Reset Input: Active low, debounced manual reset input (MR) is included.
- Threshold Detector: 1.25 V threshold detector to warn of power failures, detect low battery conditions, or monitor an additional power supply.
- Package Options: Available in narrow 8-lead PDIP and 8-lead SOIC packages.
Applications
- Microprocessor Systems: Ideal for monitoring and supervising microprocessor activity in various applications.
- Embedded Systems: Suitable for use in embedded systems requiring robust power management and system supervision.
- Industrial Control Systems: Used in industrial control systems to ensure reliable operation under varying power conditions.
- Automotive Systems: Can be used in automotive systems to monitor and manage power supplies effectively.
Q & A
- What is the primary function of the ADM705ARZ-REEL?
The primary function of the ADM705ARZ-REEL is to monitor 5 V power supplies and microprocessor activity, providing reset outputs during power-up, power-down, and brownout conditions.
- What is the operating voltage range of the ADM705ARZ-REEL?
The operating voltage range of the ADM705ARZ-REEL is from 1.0 V to 5.5 V.
- Does the ADM705ARZ-REEL have a watchdog timer function?
- What is the purpose of the manual reset input on the ADM705ARZ-REEL?
The manual reset input (MR) is an active low, debounced input that allows for manual reset of the system.
- What are the package options available for the ADM705ARZ-REEL?
The ADM705ARZ-REEL is available in narrow 8-lead PDIP and 8-lead SOIC packages.
- What is the operating temperature range of the ADM705ARZ-REEL?
The operating temperature range is from -40°C to +85°C for the industrial version.
- How does the ADM705ARZ-REEL handle power failures?
The device includes a 1.25 V threshold detector to warn of power failures, detect low battery conditions, or monitor an additional power supply.
- Can the ADM705ARZ-REEL be used in automotive systems?
- What is the reset pulse width of the ADM705ARZ-REEL?
The reset pulse width is between 160 ms and 280 ms.
- How does the ADM705ARZ-REEL ensure safe reset levels for microprocessors with bidirectional reset lines?
A current limiting resistor (e.g., 4.7 kΩ) must be inserted between the ADM705ARZ-REEL reset output pin and the microprocessor reset pin to prevent contention and limit the current to a safe level.
