Overview
The ADM699ARZ-REEL, produced by Analog Devices Inc., is a microprocessor supervisory circuit designed to provide comprehensive power supply monitoring and watchdog timing for microprocessor systems. This component is particularly useful in ensuring the reliable operation of microprocessors by monitoring the power supply and generating reset pulses during power-up, power-down, and low voltage conditions. It is an upgrade to earlier models like the MAX698/MAX699, offering superior performance and reliability.
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) | 4 | 200 mV | ISINK = 10 µA, VCC = 1.0 V | ||
| RESET and WDO Output Voltage | 0.4 | V | ISINK = 1.6 mA, Vcc = 5 V | ||
| RESET Output Short Circuit Current | 25 mA | ||||
| WDI Input Threshold (ADM699) | 0.8 | 3.5 | V | Logic Low/High | |
| WDI Input Current | 20 | 50 | µA | WDI = VCC, TA = +25°C |
Key Features
- Guaranteed RESET Assertion: The RESET output is guaranteed to be functional (logic low) with VCC as low as 1 V, ensuring reliable operation during low voltage conditions.
- Watchdog Timer: The ADM699 includes a watchdog timer input to monitor microprocessor activity, forcing the RESET output low if the watchdog input is not toggled within the 1-second watchdog timeout period.
- Precision Voltage Monitoring: Monitors the 5 V VCC power supply and generates a RESET pulse during power-up, power-down, and low voltage “Brown Out” conditions.
- Low Supply Current: Operates with a low supply current of 0.6 mA, making it energy-efficient.
- Multiple Package Options: Available in 8-pin plastic DIP and 16-lead SOIC packages, providing flexibility in design.
Applications
- Microprocessor Systems: Ideal for monitoring and protecting microprocessors in various systems.
- Computers and Controllers: Used in computer systems and control units to ensure reliable power supply monitoring.
- Intelligent Instruments: Suitable for use in intelligent instruments that require precise power monitoring.
- Automotive Systems: Applied in automotive systems where robust power supply monitoring is critical.
Q & A
- What is the primary function of the ADM699ARZ-REEL?
The primary function is to provide power supply monitoring and watchdog timing for microprocessor systems. - What is the operating voltage range of the ADM699ARZ-REEL?
The operating voltage range is from 3.0 V to 5.5 V. - What is the minimum supply current of the ADM699ARZ-REEL?
The minimum supply current is 0.6 mA. - Does the ADM699ARZ-REEL have a watchdog timer?
Yes, it includes a watchdog timer input to monitor microprocessor activity. - What is the watchdog timeout period of the ADM699ARZ-REEL?
The watchdog timeout period is between 1.0 s and 2.25 s. - In what packages is the ADM699ARZ-REEL available?
It is available in 8-pin plastic DIP and 16-lead SOIC packages. - What is the reset threshold voltage of the ADM699ARZ-REEL?
The reset threshold voltage is between 4.5 V and 4.73 V. - What is the reset active time of the ADM699ARZ-REEL?
The reset active time is between 140 ms and 280 ms. - Is the ADM699ARZ-REEL suitable for automotive systems?
Yes, it is suitable for use in automotive systems where robust power supply monitoring is critical. - What is the peak reflow temperature for the ADM699ARZ-REEL during soldering?
The peak reflow temperature is not explicitly stated in the provided sources, but it is crucial to follow the recommended reflow temperature specified in the datasheet to avoid damaging the component.
