Overview
The MAX809SQ232T1G, 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 device is part of the MAX809 series, which includes the MAX809 and MAX810 models. The MAX809SQ232T1G is optimized for low supply current and high reliability, making it suitable for a wide range of applications, including battery-powered equipment and critical microprocessor power supply monitoring.
Key Specifications
| Characteristic | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Power Supply Voltage (VCC to GND) | VCC | -0.3 | - | 6.0 | V |
| RESET Output Voltage (CMOS) | - | -0.3 | - | VCC + 0.3 | V |
| Input Current, VCC | - | - | 20 | mA | |
| Output Current, RESET | - | - | 20 | mA | |
| Supply Current (VCC = 3.3 V) | ICC | - | 0.5 | - | μA |
| Operating Temperature | TA | -40 | - | 105 | °C |
| Reset Active TimeOut Period | tRP | 1.0 | - | 140 | ms |
| RESET Output Voltage Low (No Load) | VOL | - | - | 0.3 | V |
| RESET Output Voltage High (No Load) | VOH | - | - | 0.8 VCC | V |
Key Features
- Precision VCC monitoring for 1.5 V, 2.5 V, 3.0 V, 3.3 V, and 5.0 V supplies, with options available in 100 mV steps from 1.2 V to 4.9 V.
- Low supply current of 0.5 μA (VCC = 3.2 V), making it suitable for battery-powered applications.
- No external components required.
- Four guaranteed minimum power-on reset pulse widths available (1 ms, 20 ms, 100 ms, and 140 ms).
- RESET output guaranteed to VCC = 1.0 V.
- Compatible with hot plug applications.
- VCC transient immunity to reject fast transient glitches on the VCC line.
- Wide operating temperature range: -40°C to 105°C.
- Pb-free and RoHS compliant.
Applications
- Computers and embedded systems.
- Battery-powered equipment.
- Critical microprocessor power supply monitoring.
- Systems requiring precise VCC monitoring and reset functionality during power-up, power-down, and brownout/sag conditions.
Q & A
- What is the primary function of the MAX809SQ232T1G?
The MAX809SQ232T1G is designed to monitor the VCC in digital systems and provide a reset signal to the host processor when necessary.
- What are the available reset timeout periods for the MAX809SQ232T1G?
The available reset timeout periods are 1 ms, 20 ms, 100 ms, and 140 ms.
- What is the typical supply current of the MAX809SQ232T1G at VCC = 3.3 V?
The typical supply current is 0.5 μA at VCC = 3.3 V.
- What is the operating temperature range of the MAX809SQ232T1G?
The operating temperature range is -40°C to 105°C.
- Is the MAX809SQ232T1G Pb-free and RoHS compliant?
- How does the MAX809SQ232T1G handle VCC transients?
The device is designed to reject fast transient glitches on the VCC line, ensuring stable operation during transient conditions.
- What packages are available for the MAX809 series?
The MAX809 series is available in SOT-23 and SC-70 packages.
- What is the RESET output behavior of the MAX809SQ232T1G?
The RESET output remains low while VCC is below the reset voltage threshold and for a reset timeout period after VCC rises above the reset threshold.
- How does the MAX809SQ232T1G ensure reset signal integrity during power-down?
The RESET output is valid to VCC = 1.0 V. Below this voltage, the output becomes an “open circuit” and does not sink current.
- Can the MAX809SQ232T1G be used in hot plug applications?
