Overview
The ADM809ZARTZ-REEL7 is a microprocessor supervisory circuit produced by Analog Devices Inc. This component is designed to monitor the power supply voltage in microprocessor systems, providing a reset output during power-up, brownout conditions, and other voltage anomalies. It ensures that the microprocessor remains in a reset state until the power supply voltage stabilizes, thereby preventing malfunctions due to voltage fluctuations.
Key Specifications
| Parameter | Description |
|---|---|
| Package | SOT-23-3, TO-236-3, SC-59 |
| Number of Pins | 3 |
| Reset Output | Active Low Logic Output |
| Reset Timeout | 140 ms minimum |
| Reset Threshold Voltage | 2.93 V (ADM809-5S), 4.63 V (ADM809-5L) |
| Supply Current | 17 μA to 50 μA (VCC < 3.6 V or VCC < 5.5 V) |
| Operating Voltage Range | 1.0 V to 5.5 V |
| Junction Temperature | −40°C to +150°C |
| Reset Output Voltage Low | 0.3 V (VCC = VTH min, ISINK = 1.2 mA) |
| Reset Output Voltage High | 0.8 VCC (VCC > VTH max, ISOURCE = 500 μA) |
Key Features
- Provides a reset output during power-up and brownout conditions to ensure the microprocessor remains in a reset state until the power supply voltage stabilizes
- Internal timer holds reset asserted for a minimum of 140 ms to ensure stable power conditions
- Reset output remains operational with VCC as low as 1 V
- Push-pull output (ADM809) or open-drain output (ADM803, but not applicable for ADM809)
- Seven reset threshold voltage options available for monitoring various supply voltages
- Built-in glitch immunity to protect against fast transients on VCC
- Low power consumption of 17 μA to 50 μA, suitable for low power and portable equipment
- Standard output dependent on VCC, enabling use in both 3 V and 5 V systems
Applications
- Microprocessor systems requiring power supply voltage monitoring and reset functionality
- Low power and portable equipment where power efficiency is crucial
- Systems needing protection against brownout conditions and voltage anomalies
- Embedded systems, industrial control systems, and other applications requiring reliable power monitoring
Q & A
- What is the primary function of the ADM809ZARTZ-REEL7?
The primary function is to monitor the power supply voltage in microprocessor systems and provide a reset output during power-up, brownout conditions, and other voltage anomalies.
- What are the available reset threshold voltage options for the ADM809?
The ADM809 offers several reset threshold voltage options, including 2.93 V and 4.63 V, among others, to suit various supply voltages.
- How long does the internal timer hold the reset asserted?
The internal timer holds the reset asserted for a minimum of 140 ms to ensure stable power conditions.
- What is the operating voltage range of the ADM809?
The operating voltage range is from 1.0 V to 5.5 V.
- What is the typical supply current of the ADM809?
The typical supply current is between 17 μA to 50 μA, depending on the VCC voltage.
- What type of output does the ADM809 provide?
The ADM809 provides an active low logic output.
- How does the ADM809 protect against voltage transients?
The ADM809 features built-in glitch immunity to protect against fast transients on VCC.
- What are the package options for the ADM809ZARTZ-REEL7?
The package options include SOT-23-3, TO-236-3, and SC-59.
- What is the junction temperature range for the ADM809?
The junction temperature range is from −40°C to +150°C.
- How does the ADM809 ensure a valid reset output down to VCC = 0 V?
A high impedance CMOS logic input connected to RESET may drift to undetermined logic levels when VCC falls below 0.8 V. To eliminate this, a 100 kΩ resistor should be connected from RESET to ground.
