Overview
The MAX809SQ293D2T1G, produced by onsemi, is a part of the MAX809 and MAX810 series of system supervisor circuits. These devices are designed to monitor the VCC in digital systems and provide a reset signal to the host processor when necessary. They are cost-effective, require no external components, and are optimized for battery-powered applications and hot plug scenarios.
The MAX809 series, specifically the MAX809SQ293D2T1G, features an active-low RESET output, while the MAX810 series has an active-high RESET output. These devices are available in SOT-23 and SC-70 packages, making them suitable for a variety of applications.
Key Specifications
| Characteristic | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Power Supply Voltage (VCC to GND) | VCC | -0.3 | - | 6.0 | V |
| Supply Current (VCC = 3.3 V) | ICC | - | 0.5 | - | μA |
| Detector Voltage Threshold | VTH | 1.2 | - | 4.9 | V |
| Reset Active TimeOut Period | tRP | 1.0 | - | 140 | ms |
| VCC to Reset Delay | - | - | 10 | - | μsec |
| Operating Temperature | TA | -40 | - | 105 | °C |
| 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 supplies from 1.5 V to 5.0 V, with options available in 100 mV steps.
- 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.
- 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.
Q & A
- What is the primary function of the MAX809SQ293D2T1G?
The primary function is to monitor the VCC in digital systems and provide a reset signal to the host processor when necessary.
- What are the available package types for the MAX809 series?
The devices are available in SOT-23 and SC-70 packages.
- What is the typical supply current of the MAX809SQ293D2T1G at VCC = 3.3 V?
The typical supply current is 0.5 μA.
- What are the guaranteed minimum power-on reset pulse widths available?
The available pulse widths are 1 ms, 20 ms, 100 ms, and 140 ms.
- How does the MAX809SQ293D2T1G handle VCC transients?
The device is optimized to reject fast transient glitches on the VCC line.
- What is the operating temperature range of the MAX809SQ293D2T1G?
The operating temperature range is -40°C to 105°C.
- Is the MAX809SQ293D2T1G Pb-free and RoHS compliant?
Yes, the device is Pb-free and RoHS compliant.
- What happens to the RESET output when VCC falls below the reset threshold?
The RESET output remains low for the MAX809 series and high for the MAX810 series until VCC rises above the reset threshold and the timeout period has elapsed.
- How can transient immunity be improved for the MAX809SQ293D2T1G?
Transient immunity can be improved by adding a capacitor in close proximity to the VCC pin.
- What should be done if the RESET signal must be maintained valid to VCC = 0 V?
A pull-down resistor should be connected from RESET to ground to discharge stray capacitances and hold the output low.
