Overview
The ADM708RAR is a microprocessor supervisory circuit produced by Analog Devices Inc. This component is designed to monitor the supply voltage and provide a reset signal to the microprocessor if the voltage falls below a predetermined threshold. It is particularly useful in ensuring the proper operation of microprocessors in various electronic systems.
Key Specifications
| Parameter | Value | Conditions |
|---|---|---|
| Voltage Threshold | 2.63 V | - |
| Supply Voltage Range (VCC) | 2.70 V to 5.5 V | - |
| Quiescent Current | 100 µA (typical) | VCC = 3 V |
| Reset Pulse Width | 200 ms | - |
| Manual Reset Input (MR) Threshold | VIL = 0.6 V, VIH = 0.7 × VCC | VCC < 3.6 V |
| MR to Reset Output Delay | 750 ns (typical) | VCC < 3.6 V |
| Reset Output | Active High/Active Low | - |
| Package Type | 8-lead SOIC | - |
Key Features
- Precision supply voltage monitoring with thresholds of 2.63 V, 2.93 V, and 3.08 V depending on the model variant.
- Low quiescent current of 100 µA.
- Debounced manual reset input (MR).
- Independent watchdog timer with a 1.6-second timeout (not available in ADM708R/S/T models).
- Active high and active low reset outputs.
- Power fail input for low battery warning.
- Available in narrow 8-lead PDIP and 8-lead SOIC packages.
Applications
- Microprocessor and microcontroller systems requiring voltage monitoring and reset functions.
- Embedded systems where power fail detection and reset are critical.
- Industrial control systems.
- Medical devices requiring reliable power monitoring.
- Automotive electronics.
Q & A
- What is the primary function of the ADM708RAR?
The primary function of the ADM708RAR is to monitor the supply voltage and provide a reset signal to the microprocessor if the voltage falls below a predetermined threshold.
- What are the available voltage thresholds for the ADM708RAR?
The ADM708RAR has a voltage threshold of 2.63 V, but other variants in the series have thresholds of 2.93 V and 3.08 V.
- What is the quiescent current of the ADM708RAR?
The quiescent current of the ADM708RAR is typically 100 µA.
- Does the ADM708RAR have a watchdog timer?
No, the ADM708RAR does not have a watchdog timer function. This feature is available in other models like the ADM706 series.
- What types of reset outputs does the ADM708RAR provide?
The ADM708RAR provides both active high and active low reset outputs.
- In what packages is the ADM708RAR available?
The ADM708RAR is available in 8-lead SOIC packages.
- What is the purpose of the manual reset input (MR)?
The manual reset input (MR) allows for a manual reset of the system by triggering the reset output when the MR input goes from low to high.
- How long does the reset pulse last?
The reset pulse lasts for 200 ms after the supply voltage goes above the reset threshold or the MR input goes from low to high.
- What is the power fail input used for?
The power fail input is used for low battery warning or power fail detection.
- In which types of systems is the ADM708RAR commonly used?
The ADM708RAR is commonly used in microprocessor and microcontroller systems, embedded systems, industrial control systems, medical devices, and automotive electronics.
