Overview
The ADM705AR-REEL7, produced by Analog Devices Inc., is a microprocessor supervisory circuit designed to monitor 5 V power supplies and microprocessor activity. This component is part of the ADM705/ADM706/ADM707/ADM708 family, which provides essential functions for ensuring the reliable operation of microprocessors under various power conditions.
The ADM705AR-REEL7 is specifically configured with a reset threshold monitor level of 4.65 V and includes features such as power-supply monitoring, watchdog timer functionality, and manual reset inputs. It is available in an 8-lead SOIC package and is suitable for industrial applications with an operating temperature range of -40°C to +85°C.
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 | 4.5 | 4.65 | 4.75 | V | ADM705/ADM707 |
| Reset Threshold Hysteresis | 40 mV | ||||
| Reset Pulse Width | 160 | 200 | 280 | ms | |
| Reset Output Voltage | VCC - 1.5 V | ISOURCE = 800 μA | |||
| Watchdog Timeout Period (tWD) | 1.00 | 1.60 | 2.25 | sec | |
| Manual Reset Input (MR) Pull-Up Current | 100 | 250 | 600 | μA | MR = 0 V |
| Power-Fail Input (PFI) Threshold | 1.2 | 1.25 | 1.3 | V | |
| Operating Temperature Range | -40°C | +85°C | Industrial (Version A) |
Key Features
- Power-Supply Monitoring: Generates a reset output during power-up, power-down, and brownout conditions. The reset output remains operational with VCC as low as 1 V.
- Watchdog Timer: Independent watchdog monitoring circuitry activated if the watchdog input has not been toggled within 1.60 seconds.
- Manual Reset Input: Active low, debounced manual reset input (MR).
- Power-Fail Detection: 1.25 V threshold detector to warn of power failures, detect low battery conditions, or monitor an additional power supply.
- Package Options: Available in narrow 8-lead PDIP and 8-lead SOIC packages.
Applications
- Microprocessor Systems: Suitable for monitoring and protecting microprocessors in various applications.
- Embedded Systems: Used in embedded systems that require reliable power monitoring and reset functions.
- Industrial Control Systems: Applicable in industrial environments where robust power monitoring is essential.
- Battery-Powered Devices: Useful for monitoring battery conditions and ensuring proper system operation.
Q & A
- What is the primary function of the ADM705AR-REEL7?
The primary function is to monitor 5 V power supplies and microprocessor activity, generating reset outputs during power-up, power-down, and brownout conditions.
- What is the reset threshold voltage for the ADM705AR-REEL7?
The reset threshold voltage is 4.65 V.
- What is the watchdog timeout period for the ADM705AR-REEL7?
The watchdog timeout period is between 1.00 and 2.25 seconds.
- What types of packages are available for the ADM705AR-REEL7?
It is available in narrow 8-lead PDIP and 8-lead SOIC packages.
- What is the operating temperature range for the ADM705AR-REEL7?
The operating temperature range is -40°C to +85°C.
- How does the manual reset input work?
The manual reset input (MR) is an active low, debounced input that triggers a reset when pulled low.
- What is the purpose of the power-fail input (PFI)?
The power-fail input (PFI) is used to detect power failures, low battery conditions, or to monitor an additional power supply with a threshold of 1.25 V.
- Can the ADM705AR-REEL7 be used in battery-powered devices?
Yes, it is useful for monitoring battery conditions and ensuring proper system operation in battery-powered devices.
- How does the reset output behave at low VCC levels?
The reset output remains operational with VCC as low as 1 V.
- What is the maximum supply current for the ADM705AR-REEL7?
The maximum supply current is 250 μA.
