Overview
The ADM707AR-REEL, produced by Analog Devices Inc., is a 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 specifically tailored for applications requiring precise power supply monitoring and reset functionality.
The ADM707AR-REEL is particularly useful in systems that need to ensure reliable operation during power-up, power-down, and brownout conditions. It features a reset output that remains operational even when the supply voltage drops as low as 1 V, ensuring the microprocessor is properly reset to prevent data corruption or system malfunctions.
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 (ADM707) | 4.5 | 4.65 | 4.75 | V | - |
| Reset Pulse Width | 160 | 200 | 280 | ms | - |
| Reset Output Voltage | VCC - 1.5 | - | 0.4 | V | ISOURCE = 800 μA, ISINK = 1.2 mA |
| MR to Reset Output Delay | - | - | 250 | ns | - |
| PFI Input Threshold | 1.2 | 1.25 | 1.3 | V | - |
| PFO Output Voltage | VCC - 1.5 | - | 0.4 | V | ISOURCE = 800 μA, ISINK = 3.2 mA |
| Operating Temperature Range | -40 | - | 85 | °C | Industrial (Version A) |
Key Features
- Power-On Reset Output: Generates a reset output during power-up, power-down, and brownout conditions, ensuring the microprocessor is properly initialized.
- Low Voltage Operation: The reset output remains operational with VCC as low as 1 V.
- Manual Reset Input: An active low, debounced manual reset input (MR) allows for manual system reset.
- Power-Fail Detection: A 1.25 V threshold detector warns of power failures, detects low battery conditions, or monitors an additional power supply.
- Active High and Low Reset Outputs: The ADM707 provides both active high and active low reset outputs.
- Package Options: Available in 8-lead PDIP and 8-lead SOIC packages.
Applications
- Microprocessor Systems: Ideal for monitoring and ensuring the reliable operation of microprocessors in various applications.
- Embedded Systems: Suitable for use in embedded systems that require precise power supply monitoring and reset functionality.
- Industrial Control Systems: Used in industrial control systems to ensure robust operation under varying power conditions.
- Battery-Powered Devices: Useful in battery-powered devices to detect low battery conditions and prevent system malfunctions.
Q & A
- What is the primary function of the ADM707AR-REEL?
The primary function is to monitor the 5 V power supply and generate a reset output during power-up, power-down, and brownout conditions to ensure microprocessor reliability.
- What is the minimum VCC voltage at which the reset output remains operational?
The reset output remains operational with VCC as low as 1 V.
- What is the purpose of the manual reset input (MR)?
The manual reset input (MR) allows for manual system reset and is internally debounced to prevent spurious resets.
- What is the threshold voltage for the power-fail input (PFI)?
The power-fail input (PFI) threshold is between 1.2 V and 1.3 V.
- Does the ADM707AR-REEL have a watchdog timer function?
No, the ADM707AR-REEL does not have a watchdog timer function; instead, it provides an active high reset output in addition to the active low reset output.
- What are the available package options for the ADM707AR-REEL?
The ADM707AR-REEL is available in 8-lead PDIP and 8-lead SOIC packages.
- What is the operating temperature range for the ADM707AR-REEL?
The operating temperature range is from -40°C to +85°C for the industrial version.
- How does the ADM707AR-REEL handle power supply voltage monitoring?
The ADM707AR-REEL monitors the supply voltage and generates a reset when it falls below the specified threshold (4.65 V for ADM707).
- Can the ADM707AR-REEL be used in battery-powered devices?
- What is the quiescent current of the ADM707AR-REEL?
The quiescent current is typically 250 μA.
