MAX820RESE+

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PMIC (Power Management Integrated Circuit) circuitry provides the voltage regulating, monitoring, and control functions needed to keep today\'s electronic devices running properly, and supervisors are dedicated ICs that continuously monitor 5V, 3V and 2.5V power supply and reset the main microcontroller in case of abrupt voltage drop. The MAX820RESE+ is a perfect fit for microprocessors, microcontrollers, and ASICs requiring 1.5V to 5V fixed and adjustable voltage supplies. It is a high-accuracy, ultra-low power voltage supervisor circuit offering an adjustable threshold voltage and reset output.

The MAX820RESE+ operates on input voltages from 1.5V to 5V and performs supply voltage monitoring, sequencing, and reset in various applications. This circuit offers precise threshold accuracy of ±0.85% (typical) and temperature stability of ±3.5mV/°C (typical). The output from this circuit can be used directly to reset microprocessor applications, resulting in improved reset ac- curacy and reset control. The MAX820RESE+ offers a wide variety of reset timer delays between 100ms and 140s (typical), external reset disable, CMOS output, and reset-active-high or reset-active-low selection. The device also provides superior inrush current protection, fast recovery time, and hot-plug reset capability. Reset and output pins are active-low, open-drain or active-high, open-collector.

The MAX820RESE+ is an excellent choice for providing power-on reset signals because of its ultra low supply current, wide input voltage range, and adjustable reset thresholds. The circuit provides maximum reset accuracy with CMOS output thanks to the high accuracy of −0.85% (typical) and the tight temperature stability of ±3.5mV/°C (typical).

The MAX820RESE+ employs a latching comparator that continuously monitors internal power supply voltage (VCC). When the voltage falls below the preset reset thresholds (Vth), the reset signals are issued against any micro- processor or other device. The reset output activates below the reset threshold (Vth) and stays active for the particular time period that was programmed into the device.

The MAX820RESE+ features an active-low Power-on-Reset (POR) flag. This flag goes low whenever the supply voltage (VCC) falls below the preset voltage latch threshold. The POR flag returns to high-impedance after the VCC rises above the POR release voltage threshold, provided that approximately 1.2V is maintained for a minimum of 200 μs after the POR controller Release Voltage (VR) is reached. The flag allows external logic to detect the POR state and make proper adjustments for applications that require during startup.

The MAX820RESE+ features an adjustable reset threshold, reset delay time and reset disable. This means that the circuit can be easily adjusted to exactly meet the voltage requirement of a specific application. The device also includes fast start-up at power-on and fast response time to power supply glitches. It also provides comprehensive power-on reset to protect the microprocessor in case of unexpected power supply voltage changes.

In conclusion, the MAX820RESE+ is an efficient and reliable voltage supervisor circuit that accurately monitors 5V, 3V and 2.5V power supplies. This PMIC circuit offers precise threshold accuracy, ultra low-power operation and adjustable reset thresholds. Additionally, it has excellent inrush current protection, hot-plug reset capability and fast reset-to-reset time. All these features make it perfect for use in various microprocessor, microcontroller and ASIC applications.

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