Overview
The ADM705ARZ-REEL7, produced by Analog Devices Inc., is a low-cost microprocessor supervisory circuit designed to monitor 5 V power supplies and batteries. This device is part of the ADM705/ADM706/ADM707/ADM708 family, which provides essential functions for ensuring the reliable operation of microprocessor systems. The ADM705ARZ-REEL7 specifically includes features such as power-supply monitoring, reset generation during power-up, power-down, and brownout conditions, and an independent watchdog timer.
Key Specifications
| Parameter | Min | Typ | Max | Unit | Test Conditions/Comments |
|---|---|---|---|---|---|
| VCC Operating Voltage Range | 1.0 | 5.5 | V | ||
| Supply Current | 190 | 250 | µA | ||
| Reset Threshold | 4.5 | 4.65 | 4.75 | V | ADM705/ADM707 |
| Reset Threshold Hysteresis | 40 mV | ||||
| Reset Pulse Width | 160 | 200 | 280 ms | ||
| RESET Output Voltage | 0.4 V | ISOURCE = 800 µA | |||
| Operating Temperature Range | -40°C | +85°C | Industrial (Version A) | ||
| Package | 8-SOIC (0.154", 3.90mm Width) |
Key Features
- Power-Supply Monitoring: Generates a reset output during power-up, power-down, and brownout conditions.
- Independent Watchdog Timer: Activated if the watchdog input has not been toggled within 1.60 seconds (for ADM705 and ADM706 models).
- Manual Reset Input: Active low, debounced manual reset input (MR) that can be driven from TTL, CMOS logic, or a manual reset switch.
- Power-Fail Input and Output: Includes a 1.25 V threshold detector to warn of power failures or low battery conditions.
- Reset Output: Active low reset output with an optional active high reset output for ADM707 and ADM708 models.
- Package Options: Available in 8-lead PDIP and 8-lead SOIC packages.
Applications
- Microprocessor Systems: Suitable for monitoring and ensuring the reliable operation of microprocessors.
- Computers and Controllers: Used in various computer and controller systems to monitor power supplies and microprocessor activity.
- Intelligent Instruments: Ideal for use in intelligent instruments that require robust power monitoring.
- Automotive Systems: Used in automotive systems for critical microprocessor power monitoring.
Q & A
- What is the primary function of the ADM705ARZ-REEL7?
The primary function is to monitor 5 V power supplies and generate reset signals during power-up, power-down, and brownout conditions.
- What are the reset threshold levels for the ADM705 and ADM707 models?
The reset threshold levels are 4.65 V for the ADM705 and ADM707 models, and 4.40 V for the ADM706 and ADM708 models.
- What is the watchdog timer timeout period for the ADM705 and ADM706 models?
The watchdog timer timeout period is between 1.00 to 2.25 seconds.
- What is the power-fail input threshold voltage?
The power-fail input threshold voltage is between 1.2 V to 1.3 V.
- What are the package options available for the ADM705ARZ-REEL7?
The device is available in 8-lead PDIP and 8-lead SOIC packages.
- What is the operating temperature range for the ADM705ARZ-REEL7?
The operating temperature range is from -40°C to +85°C.
- How does the manual reset input (MR) function?
The manual reset input (MR) is an active low, debounced input that can be driven from TTL, CMOS logic, or a manual reset switch.
- What is the purpose of the power-fail output (PFO)?
The power-fail output (PFO) goes low when the power-fail input (PFI) is less than 1.25 V, indicating a power failure or low battery condition.
- Can the reset output be used for other purposes?
If the reset output is required for other uses, it must be buffered to prevent contention with microprocessors having bidirectional reset lines.
- What is the supply current of the ADM705ARZ-REEL7?
The supply current is between 190 µA to 250 µA.
