Overview
The ADM698ARZ-REEL is a microprocessor supervisory circuit produced by Analog Devices Inc. This component is designed to provide power supply monitoring and watchdog timing for microprocessor systems. It 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.
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 | |||
| Operating Temperature Range | -40°C | 85°C | |||
| Package Type | 16-lead SOIC |
Key Features
- Power Supply Monitoring: The ADM698ARZ-REEL monitors the 5 V VCC power supply and generates a RESET pulse during power-up, power-down, and low voltage “Brown Out” conditions.
- Guaranteed RESET Assertion: The RESET output is guaranteed to be functional (logic low) with VCC as low as 1 V.
- Low Supply Current: The device operates with a low supply current of 0.6 mA to 1.95 mA.
- Watchdog Timer (ADM699): Although the ADM698 does not include a watchdog timer, the ADM699 variant features an additional watchdog timer input to monitor microprocessor activity.
- Precision Voltage Monitoring: The device has a precise voltage monitoring threshold of 4.65 V with a hysteresis of 40 mV.
- Reset Active Time: The reset active time ranges from 140 ms to 280 ms at TA = +25°C and VCC = +5 V.
- Package Options: Available in 16-lead SOIC packages.
Applications
- Microprocessor Systems: Ideal for monitoring and managing power supply conditions in microprocessor-based systems.
- Computers and Controllers: Used in various computer and controller applications to ensure reliable operation.
- Intelligent Instruments: Suitable for use in intelligent instruments that require precise power supply monitoring.
- Automotive Systems: Employed in automotive systems for critical power monitoring and reset functions.
Q & A
- What is the primary function of the ADM698ARZ-REEL?
The primary function is to monitor the power supply and generate reset pulses during power-up, power-down, and low voltage conditions to ensure the reliable operation of microprocessors.
- What is the operating voltage range of the ADM698ARZ-REEL?
The operating voltage range is from 3.0 V to 5.5 V.
- How much current does the ADM698ARZ-REEL consume?
The supply current ranges from 0.6 mA to 1.95 mA.
- What is the reset threshold voltage for the ADM698ARZ-REEL?
The reset threshold voltage is 4.65 V with a hysteresis of 40 mV.
- Does the ADM698ARZ-REEL have a watchdog timer?
No, the ADM698 does not have a watchdog timer. However, the ADM699 variant includes this feature.
- What is the reset active time for the ADM698ARZ-REEL?
The reset active time ranges from 140 ms to 280 ms at TA = +25°C and VCC = +5 V.
- In what package type is the ADM698ARZ-REEL available?
The device is available in a 16-lead SOIC package.
- What are the typical applications of the ADM698ARZ-REEL?
Typical applications include microprocessor systems, computers, controllers, intelligent instruments, and automotive systems.
- Is the ADM698ARZ-REEL RoHS compliant?
- What is the operating temperature range of the ADM698ARZ-REEL?
The operating temperature range is from -40°C to 85°C.
