Overview
The ADM708TAR-REEL is a microprocessor supervisory circuit produced by Analog Devices Inc. This integrated circuit is designed to monitor power supply voltages and provide reset signals to the system in the event of voltage drops or other power-related issues. It is part of the ADM708 series, which offers various reset threshold levels and output configurations.
The device is particularly useful in systems that require reliable power monitoring and reset functionality to ensure proper operation and prevent data corruption or system failures.
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, ADM708T |
| Reset Threshold Hysteresis | 20 | mV | |||
| Reset Pulse Width | 160 | 200 | 280 | ms | |
| Reset Output Voltage | 0.4 | V | VCC - 1.5 V, ISOURCE = 800 µA | ||
| Manual Reset Input (MR) Pull-Up Current | 100 | 250 | 600 | µA | MR = 0 V |
| MR to Reset Output Delay | 250 | ns | |||
| Power Fail Input (PFI) Threshold | 1.2 | 1.25 | 1.3 | V | |
| Operating Temperature Range | -40 | 85 | °C | Industrial (Version A) | |
| Package | 8-lead SOIC |
Key Features
- Simple Reset/Power-On Reset Functionality: Provides a reset signal to the system in case of voltage drops or power failures.
- Single Voltage Monitoring: Monitors the power supply voltage and triggers a reset if the voltage falls below the set threshold.
- Dual Output Configuration: Offers both active high and active low reset outputs for versatile system integration.
- Programmable Reset Timeout: The reset pulse width is programmable with a minimum of 160 ms.
- Low Voltage Threshold: Preset at 2.93 V for the ADM708S and 3.08 V for the ADM708T models.
- Operational Temperature Range: Functions reliably from -40°C to 85°C.
- Surface Mount 8-SOIC Package: Compact design suitable for space-constrained PCBs.
- Debounced Manual Reset Input (MR): Allows for manual reset with internal debouncing to prevent spurious resets.
Applications
- Microprocessor and Microcontroller Systems: Ensures reliable operation by monitoring power supply voltages and providing reset signals as needed.
- Embedded Systems: Suitable for use in various embedded systems that require power monitoring and reset functionality.
- Industrial Control Systems: Used in industrial environments where robust and reliable power monitoring is crucial.
- Automotive Systems: Can be used in automotive electronics to ensure system reliability under varying power conditions.
- Medical Devices: Applicable in medical devices where precise power monitoring is essential for safety and reliability.
Q & A
- What is the primary function of the ADM708TAR-REEL?
The primary function of the ADM708TAR-REEL is to monitor power supply voltages and provide reset signals to the system in case of voltage drops or power failures.
- What are the available package types for the ADM708TAR-REEL?
The ADM708TAR-REEL is available in an 8-lead SOIC package.
- What is the reset threshold voltage for the ADM708S model?
The reset threshold voltage for the ADM708S model is preset at 2.93 V.
- Does the ADM708TAR-REEL have a watchdog timer function?
No, the ADM708TAR-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 is the operational temperature range of the ADM708TAR-REEL?
The operational temperature range of the ADM708TAR-REEL is from -40°C to 85°C.
- How does the manual reset input (MR) work?
The manual reset input (MR) can be driven from TTL, CMOS logic, or a manual reset switch. It is internally debounced and has an internal 70 µA pull-up current to hold the input high when floating.
- What is the typical supply current of the ADM708TAR-REEL?
The typical supply current of the ADM708TAR-REEL is 200 µA.
- What is the reset pulse width of the ADM708TAR-REEL?
The reset pulse width of the ADM708TAR-REEL is typically 200 ms, with a range of 160 ms to 280 ms.
- How does the power fail input (PFI) work?
The power fail input (PFI) has a threshold voltage range of 1.2 V to 1.3 V and is used to monitor power fail or low battery conditions.
- What is the ESD rating of the ADM708TAR-REEL?
The ESD rating of the ADM708TAR-REEL is greater than 4.5 kV.
