Voltage Monitors MAX811SEUS+T
The MAX811SEUS+T from Analog Devices Inc./Maxim Integrated is a 4-pin Voltage Monitor for power management applications. It has a reset timeout of at least 140 ms and monitors a single voltage with a 2.93V threshold. 2.98V is the highest reset threshold voltage.
Description
Product parameter
|
Type |
Parameter |
|
Category |
Integrated Circuits (ICs) - Power Management (PMIC) - Supervisors |
|
Manufacturer |
Analog Devices Inc./Maxim Integrated |
|
Type |
Simple Reset/Power-On Reset |
|
Adjustable Threshold |
No |
|
Reset |
Active Low |
|
Voltage - Threshold |
2.93V |
|
Number of Voltages Monitored |
1 |
|
Reset Timeout |
140 ms Minimum |
|
Min Reset Threshold Voltage |
2.88V |
|
Max Reset Threshold Voltage |
2.98V |
|
Output |
Push-Pull, Totem Pole |
|
Operating Temperature |
-40°C ~ 85°C (TA) |
|
Mounting Type |
Surface Mount |
|
Package / Case |
TO-253-4, TO-253AA |
|
Base Product Number |
MAX811 |
Features
- The MAX811SEUS+T offers several key benefits and features:
- Integrated Voltage Monitor:
- Enhances system reliability by monitoring power supply voltages and providing an added manual reset function.
- Precision Voltage Monitoring:
- This device accurately monitors 3V, 3.3V, and 5V power supplies, ensuring precise voltage regulation and system stability.
- Power-On Reset Pulse:
- Provides a minimum power-on reset pulse width of 140ms, which helps ensure proper initialization of system components.
- Guaranteed Operation:
- RESET output remains valid even when the supply voltage (VCC) drops as low as 1V, ensuring reliable system resets.
- Power-Supply Transient Immunity:
- Offers robust performance against power supply transients, enhancing overall system reliability.
Application
- The MAX811SEUS+T is well-suited for applications requiring robust power monitoring and reset functionality:
- Power Monitoring and Reset:
- The MAX811SEUS+T effectively manages power-up, power-down, and brownout conditions, issuing a reset signal to the microprocessor to ensure reliable system startup and shutdown.
- Transient Immunity:
- It is designed to withstand short-duration negative-going VCC transients, providing stable operation even when brief voltage drops occur, thereby enhancing system robustness.
- Valid RESET Output:
- The device can be configured with a pull-down resistor on the RESET pin to maintain a low reset signal, providing reliable operation even with minimum supply voltage, for applications that require a valid reset output down to 0V.
- Enhanced Stability:
- Adding a 0.1μF capacitor near VCC enhances resistance to momentary glitches, assisting in maintaining steady operation and averting accidental resets during small voltage dips.
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Q: What is the MAX811SEUS+T intended for?
A: This circuit is a voltage monitor and reset IC that monitors power supply voltages and sends a reset signal to the system to ensure a consistent power-up, power-down, and brownout.
Q: How accurate is this voltage monitoring?
A: It accurately monitors 3V, 3.3V, and 5V power supplies, ensuring stable voltage management and consistent operation across a variety of power systems.
Q: What is the minimum reset pulse duration supported by this chip?
A: It provides a minimum power-on reset pulse width of 140ms to ensure that system components are properly initialized during startup.
Q: Can the MAX811 work at a low supply voltage?
A: Yes, the RESET output is valid even when the supply voltage decreases to as low as 1V, ensuring dependable resets in low-voltage applications.
Q: How does this chip manage power supply transients?
A: The device is very resistant to short-duration negative VCC transients, allowing for steady operation even during brief voltage drops, which improves overall system reliability.
Q: Does the MAX811 require extra capacitance?
A: It is advised to install a 0.1μF capacitor close to VCC to increase transient immunity, avoid unintentional resets during brief voltage dips, and preserve system stability.
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