Overview
The MAX809STR, produced by onsemi, is a cost-effective system supervisor circuit designed to monitor the VCC in digital systems and provide a reset signal to the host processor when necessary. This 3-pin microprocessor reset monitor is essential for maintaining the stability of microprocessor systems by accurately monitoring the power supply voltage and generating a reset signal during power-up, power-down, and brownout/sag conditions. No external components are required, making it a straightforward and efficient solution for various applications.
Key Specifications
| Characteristic | Value | Unit |
|---|---|---|
| Brand | onsemi | |
| Description | Microprocessor Reset Monitor | |
| Number of Voltages Monitored | 1 | |
| Voltage - Threshold | 2.93V | V |
| Output | Push-Pull, Totem Pole | |
| Reset | Active Low | |
| Reset Timeout | 140ms Minimum | ms |
| Operating Temperature | -40°C ~ 105°C (TJ) | °C |
| Mounting Type | Surface Mount | |
| Package / Case | SOT-23-3 (TO-236) | |
| Supply Current | 1.0 µA (VCC = 3.3 V) | µA |
| Power Supply Voltage (VCC to GND) | -0.3 to 6.0 V | V |
Key Features
- Precision VCC monitoring for supplies from 1.2 V to 4.9 V in 100 mV steps
- Low supply current of 1.0 µA (VCC = 3.3 V), suitable for battery-powered applications
- No external components required
- VCC transient immunity to reject fast transient glitches on the power supply line
- Active-low RESET output
- Four guaranteed minimum power-on reset pulse widths (1 ms, 20 ms, 100 ms, and 140 ms)
- Wide operating temperature range: -40°C to 105°C
- Pb-free packages available
Applications
- Computers
- Embedded Systems
- Battery Powered Equipment
- Critical Microprocessor Power Supply Monitoring
- Automotive applications (NCV version)
- Body Electronics, Braking, Infotainment, Instrument Cluster, Navigator, Occupant Comfort, and Occupant Protection
Q & A
- What is the primary function of the MAX809STR?
The MAX809STR is a microprocessor reset monitor designed to monitor the VCC in digital systems and provide a reset signal to the host processor when necessary.
- What is the voltage threshold for the MAX809STR?
The voltage threshold for the MAX809STR is 2.93V.
- What type of output does the MAX809STR have?
The MAX809STR has a push-pull, totem pole output.
- Is the reset output of the MAX809STR active-high or active-low?
The reset output of the MAX809STR is active-low.
- What is the minimum reset timeout period for the MAX809STR?
The minimum reset timeout period for the MAX809STR is 140 ms.
- What is the operating temperature range of the MAX809STR?
The operating temperature range of the MAX809STR is -40°C to 105°C.
- What package types are available for the MAX809STR?
The MAX809STR is available in SOT-23-3 (TO-236) and SC-70 packages.
- How much supply current does the MAX809STR consume?
The MAX809STR consumes a low supply current of 1.0 µA (VCC = 3.3 V).
- Does the MAX809STR require any external components?
No, the MAX809STR does not require any external components.
- What types of applications is the MAX809STR suitable for?
The MAX809STR is suitable for computers, embedded systems, battery-powered equipment, and critical microprocessor power supply monitoring, among others.
