Overview
The ADM699AR, produced by Analog Devices Inc., is a microprocessor supervisory circuit designed to provide power supply monitoring and watchdog timing for microprocessor systems. This component ensures reliable system startup and operation by monitoring the 5 V VCC power supply and generating a reset pulse during power-up, power-down, and low voltage 'Brown Out' conditions. The ADM699AR also features a watchdog timer input to monitor microprocessor activity, ensuring the system remains in a valid state.
Key Specifications
| Parameter | Min | Typ | Max | Units | Test Conditions/Comments |
|---|---|---|---|---|---|
| VCC Operating Voltage Range | 3.0 | 5.5 | V | ||
| Supply Current | 0.6 | 1.95 | mA | ||
| Power-Down Reset Assertion | 4.5 | 4.65 | 4.73 | V | |
| Power-Up Reset Deassertion | 4.73 | V | |||
| Reset Threshold Hysteresis | 40 mV | ||||
| Reset Active Time | 140 | 200 | 280 | ms | TA = +25°C, VCC = +5 V |
| Watchdog Timeout Period (ADM699) | 1.0 | 1.6 | 2.25 | s | TA = +25°C, VCC = +5 V |
| Minimum WDI Input Pulse Width | 50 ns | VIL = 0.4, VIH = 3.5 V | |||
| RESET Output Voltage | 0.4 | V | ISINK = 1.6 mA, Vcc = 4.4 V | ||
| RESET Output Voltage (VCC = 1 V) | 200 mV | ISINK = 10 µA, VCC = 1.0 V | |||
| WDI Input Threshold (ADM699) | 0.8 | 3.5 | V | Logic Low and Logic High | |
| WDI Input Current | -50 | 20-50 | -20 | µA | WDI = VCC, TA = +25°C; WDI = 0 V, TA = +25°C |
Key Features
The ADM699AR offers several key features that make it a robust and reliable choice for microprocessor supervisory needs:
- Power Supply Monitoring: Monitors the 5 V VCC power supply and generates a reset pulse during power-up, power-down, and low voltage 'Brown Out' conditions.
- Watchdog Timer: Includes a watchdog timer input to monitor microprocessor activity, ensuring the system remains in a valid state. The watchdog timeout period is between 1.0 and 2.25 seconds.
- Reset Output: Provides an active high or active low reset output with a minimum timeout of 140 ms. The reset output is guaranteed to be functional (logic low) with VCC as low as 1 V.
- Low Supply Current: Operates with a low supply current of 0.6 to 1.95 mA, making it energy-efficient.
- Wide Operating Temperature Range: Functions over a wide operating temperature range of -40°C to +85°C.
- Compact Packaging: Available in 8-pin plastic DIP and 16-lead SOIC packages, making it suitable for various board designs.
Applications
The ADM699AR is versatile and can be applied in various systems, including:
- Microprocessor and Microcontroller-Based Systems: Ensures proper system startup and operation in microprocessor and microcontroller-based systems.
- Industrial Control and Automation: Suitable for industrial control systems that require reliable power monitoring and reset functionality.
- Telecommunications Equipment: Used in telecommunications equipment to ensure stable operation under various power conditions.
- Consumer Electronics: Applied in consumer electronics to provide robust reset functionality and power monitoring.
- Automotive Systems: Can be used in automotive systems for critical power monitoring and watchdog timing.
Q & A
- What is the primary function of the ADM699AR?
The primary function of the ADM699AR is to provide power supply monitoring and watchdog timing for microprocessor systems, ensuring reliable system startup and operation.
- What is the operating voltage range of the ADM699AR?
The operating voltage range of the ADM699AR is from 3.0 V to 5.5 V.
- What is the watchdog timeout period for the ADM699AR?
The watchdog timeout period for the ADM699AR is between 1.0 and 2.25 seconds.
- What types of packages are available for the ADM699AR?
The ADM699AR is available in 8-pin plastic DIP and 16-lead SOIC packages.
- What is the minimum reset timeout for the ADM699AR?
The minimum reset timeout for the ADM699AR is 140 ms.
- Is the ADM699AR still in active production?
No, the ADM699AR is an obsolete product and is no longer in active production. However, equivalent or alternative models may be available.
- What is the operating temperature range of the ADM699AR?
The operating temperature range of the ADM699AR is from -40°C to +85°C.
- How does the ADM699AR ensure system reliability during power-up and power-down?
The ADM699AR ensures system reliability by generating a reset pulse during power-up, power-down, and low voltage 'Brown Out' conditions.
- What is the supply current of the ADM699AR?
The supply current of the ADM699AR ranges from 0.6 to 1.95 mA.
- In what types of systems is the ADM699AR commonly used?
The ADM699AR is commonly used in microprocessor and microcontroller-based systems, industrial control and automation, telecommunications equipment, and consumer electronics.
