Overview
The ADM708RARZ is a microprocessor supervisory circuit produced by Analog Devices Inc. This device is designed to monitor and manage the power supply and system reset functions in various microprocessor-based systems. It offers a range of features including precision supply voltage monitoring, manual reset capability, and both active high and active low reset outputs.
Key Specifications
| Parameter | Min | Typ | Max | Unit | Test Conditions/Comments |
|---|---|---|---|---|---|
| VCC Operating Voltage Range | 1.0 | 5.5 | V | ||
| Supply Current | 100 | 250 | 350 | μA | VCC < 3.6 V and VCC < 5.5 V respectively |
| Reset Threshold | 2.55 | 2.63 | 2.70 | V | For ADM708RARZ |
| Reset Threshold Hysteresis | 20 | mV | |||
| Reset Pulse Width | 160 | 200 | 280 | ms | |
| MR Input Threshold | 0.6 | V | |||
| MR to Reset Output Delay | 250 | ns | VCC < 3.6 V and VCC < 5.5 V respectively | ||
| PFI Input Threshold | 1.2 | 1.25 | 1.3 | V |
Key Features
- Precision Supply Voltage Monitoring: The ADM708RARZ monitors the supply voltage and generates a reset signal when the voltage falls below a predefined threshold (2.63 V for ADM708RARZ).
- Manual Reset Input: The device includes a debounced manual reset input (MR) that can be driven from TTL, CMOS logic, or a manual reset switch.
- Independent Watchdog Timer: Although the ADM708 series does not include a watchdog timer, it provides both active high and active low reset outputs.
- Power Fail Input and Output: The device features a power fail input (PFI) and output (PFO) for monitoring power fail or low battery conditions.
- Low Quiescent Current: The device operates with a low quiescent current of 100 μA to 350 μA depending on the supply voltage.
Applications
- Microprocessor Systems: Ideal for monitoring and managing power supply in microprocessor-based systems.
- Computers and Controllers: Used in various computer and controller applications to ensure reliable operation.
- Intelligent Instruments: Suitable for use in intelligent instruments that require precise voltage monitoring and reset functions.
- Automotive Systems: Can be used in automotive systems for critical microprocessor power monitoring.
- Critical Microprocessor Monitoring: Essential in applications where reliable power supply monitoring is crucial.
Q & A
- What is the primary function of the ADM708RARZ?
The primary function of the ADM708RARZ is to monitor the supply voltage and generate a reset signal when the voltage falls below a predefined threshold.
- What are the package options available for the ADM708RARZ?
The device is available in narrow 8-lead PDIP and 8-lead SOIC packages.
- What is the operating voltage range of the ADM708RARZ?
The operating voltage range is from 1.0 V to 5.5 V.
- Does the ADM708RARZ have a watchdog timer function?
No, the ADM708 series does not include a watchdog timer function.
- What are the reset output options for the ADM708RARZ?
The device provides both active high and active low reset outputs.
- How does the manual reset input (MR) work?
The manual reset input (MR) is debounced and can be driven from TTL, CMOS logic, or a manual reset switch. It generates a reset signal when taken below 0.6 V.
- What is the quiescent current of the ADM708RARZ?
The quiescent current ranges from 100 μA to 350 μA depending on the supply voltage.
- What is the power fail input threshold for the ADM708RARZ?
The power fail input threshold is between 1.2 V and 1.3 V.
- Is the ADM708RARZ RoHS compliant?
- What are some typical applications of the ADM708RARZ?
