Overview
The ADM708ANZ is a supervisory circuit produced by Analog Devices Inc., designed to monitor and manage the power supply and system reset functions in microprocessor-based systems. This component is part of the ADM705/ADM706/ADM707/ADM708 family and is specifically tailored for applications requiring precise voltage monitoring and reset control.
The ADM708ANZ is notable for its low quiescent current, precision supply voltage monitoring, and the availability of both active high and active low reset outputs. It is an ideal choice for systems that require reliable and efficient power management.
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 | 4.25 | 4.40 | 4.50 | V | ADM706/ADM708 |
| Reset Threshold Hysteresis | 40 mV | ||||
| Reset Pulse Width | 160 | 200 | 280 ms | ||
| RESET Output Voltage | 0.4 V | V | ISOURCE = 800 μA, VCC - 1.5 V | ||
| Watchdog Timeout Period (tWD) | 1.00 | 1.60 | 2.25 sec | VIL = 0.4 V, VIH = VCC × 0.8, WDI = VCC | |
| Operating Temperature Range | -40°C | +85°C | Industrial (Version A) |
Key Features
- Precision Supply Voltage Monitor: The ADM708ANZ monitors the supply voltage with a reset threshold of 4.40 V, ensuring reliable operation of the system.
- Low Quiescent Current: The device operates with a quiescent current of 190 μA to 250 μA, making it energy-efficient.
- Debounced Manual Reset Input (MR): The MR input can be driven from TTL, CMOS logic, or a manual reset switch and is internally debounced.
- Active High and Active Low Reset Outputs: Provides both active high and active low reset outputs, offering flexibility in system design.
- Power-Fail Input (PFI): Monitors the power-fail condition with a threshold of 1.25 V, providing a low output when the input voltage falls below this level.
- Compact Packaging: Available in narrow 8-lead PDIP and 8-lead SOIC packages, as well as an 8-lead MSOP package.
Applications
- Microprocessor Systems: Ideal for monitoring and managing power supply and reset functions in microprocessor-based systems.
- Computers and Controllers: Suitable for use in computer systems, industrial controllers, and other critical control systems.
- Intelligent Instruments: Used in intelligent instruments that require precise voltage monitoring and reset control.
- Automotive Systems: Applicable in automotive systems where reliable power management is crucial.
- Critical Microprocessor Power Monitoring: Essential for any system that requires continuous monitoring of the power supply to ensure proper operation.
Q & A
- What is the primary function of the ADM708ANZ?
The primary function of the ADM708ANZ is to monitor the supply voltage and generate a reset signal when the voltage falls below a specified threshold.
- What are the reset threshold levels for the ADM708ANZ?
The reset threshold level for the ADM708ANZ is 4.40 V.
- What is the quiescent current of the ADM708ANZ?
The quiescent current of the ADM708ANZ is between 190 μA and 250 μA.
- Does the ADM708ANZ have a watchdog timer function?
No, the ADM708ANZ does not have a watchdog timer function; instead, it provides both active high and active low reset outputs.
- What types of packages are available for the ADM708ANZ?
The ADM708ANZ is available in narrow 8-lead PDIP, 8-lead SOIC, and 8-lead MSOP packages.
- What is the operating temperature range for the ADM708ANZ?
The operating temperature range for the ADM708ANZ is -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 and is internally debounced. When taken below 0.8 V, it generates a reset signal.
- What is the power-fail input (PFI) threshold?
The power-fail input (PFI) threshold is 1.25 V. When PFI is less than this value, the power-fail output (PFO) goes low.
- Can the ADM708ANZ be used in automotive systems?
- Is the ADM708ANZ suitable for use in intelligent instruments?
