Overview
The ADM709TAR, produced by Analog Devices Inc., is a power supply monitor integrated circuit designed to generate a system reset during power-up, power-down, and brownout conditions. This device ensures that the system remains in a reset state until the power supply voltage stabilizes above a predefined threshold. The ADM709TAR is particularly useful in microprocessor systems, computers, controllers, and other critical power monitoring applications where reliable power supply monitoring is essential.
Key Specifications
| Parameter | Min | Typ | Max | Units | Test Conditions/Comments |
|---|---|---|---|---|---|
| VCC Operating Voltage Range | 1.0 | - | 5.5 | V | TA = 0°C to +70°C |
| - | 1.0 | - | 5.5 | V | TA = –40°C to +85°C |
| Supply Current | 35 | 85 | 110 | µA | VCC < 3.6 V, TA = 0°C to +70°C |
| - | 35 | 110 | 200 | µA | VCC < 3.6 V, TA = –40°C to +85°C |
| - | 65 | 150 | 200 | µA | VCC < 5.5 V, TA = 0°C to +70°C |
| - | 65 | 200 | - | µA | VCC < 5.5 V, TA = –40°C to +85°C |
| Reset Threshold | 3.00 | 3.08 | 3.15 | V | ADM709TAR |
| VCC to RESET Delay | - | - | 20 | µs | VCC = Reset Threshold max |
| RESET Active Time-Out Period | 140 | 280 | 380 | ms | VCC = Reset Threshold max, VCC Rising |
| RESET Output Voltage | 0.3 | - | - | V | ISINK = 1.2 mA, VCC ≥ 1.0 V |
Key Features
- Precision supply voltage monitor for +5 V, +3.3 V, and +3 V power supplies.
- Low quiescent current of 35 µA (typical).
- 140 ms (minimum) power-on reset pulse.
- Low cost and compact 8-pin DIP and SOIC packages.
- RESET output remains operational with VCC as low as 1 V.
- Cable drop compensation and robust performance in various temperature ranges (–40°C to +85°C).
Applications
- Microprocessor systems.
- Computers and controllers.
- Intelligent instruments.
- Critical power monitoring in automotive systems.
- General power supply monitoring in various industrial and consumer electronics.
Q & A
- What is the primary function of the ADM709TAR?
The primary function of the ADM709TAR is to monitor the power supply voltage and generate a system reset during power-up, power-down, and brownout conditions. - What are the available reset threshold voltages for the ADM709 series?
The ADM709 series offers several reset threshold voltages, including 4.65 V, 4.40 V, 3.08 V, 2.93 V, and 2.63 V, depending on the specific model. - What is the quiescent current of the ADM709TAR?
The quiescent current of the ADM709TAR is typically 35 µA. - How long does the RESET output remain low after VCC rises above the threshold?
The RESET output remains low for a minimum of 140 ms after VCC rises above the threshold. - What are the operating temperature ranges for the ADM709TAR?
The ADM709TAR operates over a temperature range of –40°C to +85°C. - What types of packages are available for the ADM709TAR?
The ADM709TAR is available in 8-pin DIP and SOIC packages. - Is the RESET output active when VCC is below the reset threshold?
Yes, the RESET output remains low while VCC is below the reset threshold voltage. - Can the ADM709TAR be used in automotive systems?
Yes, the ADM709TAR can be used in automotive systems for critical power monitoring. - What is the maximum VCC operating voltage for the ADM709TAR?
The maximum VCC operating voltage for the ADM709TAR is 5.5 V. - How does the ADM709TAR handle cable drop compensation?
The ADM709TAR is designed to handle cable drop compensation, ensuring robust performance in various applications.
