Overview
The ADM709SARZ-REEL, 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 microprocessor remains in reset when the supply voltage (VCC) falls below the specified reset threshold. The RESET output is held low for a minimum of 140 ms after VCC rises above the threshold, ensuring a stable power-on sequence. The ADM709SARZ-REEL is available in 8-pin SOIC packages and operates with a supply voltage as low as 1 V.
Key Specifications
| Parameter | Min | Typ | Max | Units | Test Conditions/Comments |
|---|---|---|---|---|---|
| Operating Temperature | -40°C | 85°C | TA | ||
| Supply Voltage Range | 1.0 V | 5.5 V | TA = -40°C to +85°C | ||
| Supply Current | 35 µA | 85 µA | 200 µA | VCC < 3.6 V, TA = -40°C to +85°C | |
| Reset Threshold Voltage | 2.85 V | 2.93 V | 3.00 V | ADM709S | |
| Reset Timeout | 140 ms | 280 ms | 380 ms | VCC = Reset Threshold max, VCC Rising | |
| Reset Output Voltage | 0.3 V | ISINK = 1.2 mA, VCC = Reset Threshold min |
Key Features
- Simple Reset/Power-On Reset type
- Minimum supply voltage of 1 V
- Low operating supply current of 200 µA
- Precision supply voltage monitoring for +5 V, +3.3 V, and +3 V supplies
- 140 ms minimum power-on reset pulse
- Available in 8-pin DIP and SOIC packages
- Active low reset output with push-pull configuration
Applications
- Microprocessor systems and computers
- Controllers and intelligent instruments
- Critical power monitoring in automotive systems
- Power distribution systems in medical environments (e.g., ICU, CCU, emergency rooms)
- Medical-specific isolation transformers and insulation monitors
- Transformer load monitoring equipment
- External alarm and display equipment
- DC stabilized power supply modules
Q & A
- What is the primary function of the ADM709SARZ-REEL? The primary function is to monitor the power supply and generate a system reset during power-up, power-down, and brownout conditions.
- What is the minimum supply voltage for the ADM709SARZ-REEL? The minimum supply voltage is 1 V.
- What is the typical reset timeout period for the ADM709SARZ-REEL? The typical reset timeout period is 280 ms.
- In what packages is the ADM709SARZ-REEL available? It is available in 8-pin DIP and SOIC packages.
- What is the operating temperature range for the ADM709SARZ-REEL? The operating temperature range is -40°C to 85°C.
- What is the supply current for the ADM709SARZ-REEL? The supply current is typically 85 µA and can be up to 200 µA.
- What are some common applications of the ADM709SARZ-REEL? Common applications include microprocessor systems, automotive systems, medical equipment, and power distribution systems.
- How does the reset output of the ADM709SARZ-REEL behave? The reset output is active low and remains low while VCC is below the reset threshold voltage and for a specified period after VCC rises above the threshold.
- Can the ADM709SARZ-REEL be used in low-voltage systems? Yes, it can operate with supply voltages as low as 1 V.
- What is the purpose of the 140 ms power-on reset pulse? The 140 ms power-on reset pulse ensures that the system has sufficient time to stabilize before the microprocessor is released from reset.
