Overview
The ADM708ARMZ is a microprocessor supervisory circuit produced by Analog Devices Inc. This component is designed to provide comprehensive monitoring and reset functions for microprocessor systems, ensuring reliable operation under various conditions.
It features a precision supply voltage monitor, a debounced manual reset input, and a power fail input for low battery or power fail warnings. The ADM708ARMZ is available in several package options, including 8-lead PDIP, SOIC, and MSOP, making it versatile for different design requirements.
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) | 2.55 | 2.63 | 2.70 | V | ADM708R |
| Reset Threshold Hysteresis | 20 | mV | |||
| Reset Pulse Width | 160 | 200 | 280 | ms | |
| Watchdog Timeout Period (tWD) | 1.00 | 1.60 | 2.25 | sec | For ADM705/ADM706 models, not applicable for ADM708 |
| Manual Reset Input (MR) Pull-Up Current | 70 | μA | MR = 0 V | ||
| MR Input Threshold | 0.6 | 2.0 | V | Logic Low, Logic High | |
| Power Fail Input (PFI) Threshold | 1.2 | 1.25 | 1.3 | V | |
| Operating Temperature Range | -40 | 85 | °C | Industrial Version |
Key Features
- Precision Supply Voltage Monitor: The ADM708ARMZ monitors the supply voltage and generates a reset signal if the voltage falls below the specified threshold.
- Debounced Manual Reset Input (MR): The manual reset input is internally debounced, allowing it to be driven from TTL, CMOS logic, or a manual reset switch.
- Power Fail Input (PFI): Provides a power fail or low battery warning by monitoring the PFI input.
- Active High and Active Low Reset Outputs: The ADM708ARMZ offers both active high and active low reset outputs, making it suitable for various system designs.
- Low Quiescent Current: The device operates with a low quiescent current of 100 μA to 350 μA, depending on the VCC voltage.
Applications
- Microprocessor Systems: Ideal for monitoring and resetting microprocessors in various applications.
- Computers and Controllers: Used in computer systems and control units to ensure reliable operation.
- Intelligent Instruments: Suitable for use in intelligent instruments that require precise voltage monitoring and reset functions.
- Critical Microprocessor Supply Monitoring: Essential for critical systems where power fail or low battery conditions need to be monitored and acted upon.
Q & A
- What is the operating voltage range of the ADM708ARMZ?
The operating voltage range is from 1.0 V to 5.5 V.
- What is the typical supply current of the ADM708ARMZ?
The typical supply current is 200 μA, but it can range from 100 μA to 350 μA depending on the VCC voltage.
- What is the reset pulse width of the ADM708ARMZ?
The reset pulse width is typically 200 ms, with a range of 160 ms to 280 ms.
- Does the ADM708ARMZ have a watchdog timer function?
No, the ADM708ARMZ does not have a watchdog timer function. Instead, it provides active high and active low reset outputs.
- What is the power fail input threshold of the ADM708ARMZ?
The power fail input threshold is between 1.2 V and 1.3 V, with a typical value of 1.25 V.
- What are the package options available for the ADM708ARMZ?
The ADM708ARMZ is available in 8-lead PDIP, SOIC, and MSOP packages.
- What is the operating temperature range of the ADM708ARMZ?
The operating temperature range is from -40°C to +85°C for the industrial version.
- Is the manual reset input (MR) internally debounced?
Yes, the manual reset input (MR) is internally debounced, allowing it to be driven from TTL, CMOS logic, or a manual reset switch.
- What is the typical quiescent current of the ADM708ARMZ?
The typical quiescent current is 200 μA, but it can vary based on the VCC voltage.
- Does the ADM708ARMZ have both active high and active low reset outputs?
Yes, the ADM708ARMZ provides both active high and active low reset outputs.
