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XC6121A418ER-G Application Field and Working Principle

The XC6121A418ER-G is part of the XC6000 series of products from ON Semiconductor. This series of products targets the PMIC - Supervisors industry and provides features like low-voltage monitoring devices, system supervision, and more. This article aims to provide an overview of the XC6121A418ER-G, its application field, and its working principle.

Application Field

The XC6121A418ER-G is a low-voltage supervisor that is ideal for applications that needs to detect on-off power supplies and the power- good signal of electronic systems. It operates with input supply voltage of up to 30V and has a built-in power on reset that ensures that microprocessors and memory chips are correctly initialized when power resumes. It also has an open drain output which is ideal for sinking loads of up to 24mA, allowing for greater flexibility in the application.

The device has an excellent power supply rejection ratio which ensures that the output signal is reliable even when the input voltage is highly noisy. It has excellent static protection that prevents damage to the device when power is applied, as well as protection against short circuit and thermal overload. As such, it can be used in a variety of applications such as computers, consumer electronics, medical equipment and more.

Working Principle

The XC6121A418ER-G is a low-voltage supervisor that operates on an input supply voltage up to 30V and has a wide operating temperature range of -40°C to +85°C. It utilizes a precision voltage reference and an active low-power comparator to sense the supply voltage and generate a reset signal if the supply voltage drops below the falling supply voltage threshold. The device also has an internal pull-up resistor and an open drain reset output.

The device has two primary modes of operation. In the delayed reset mode, the falling supply voltage threshold is set at 4.88V and the device has an internal reset delay of around 400ms. This mode is used when the output reset is needed to reset microprocessors and memory chips. In the active reset mode, the falling supply voltage threshold is set at 4.85V and the device has an internal reset delay of around 10ms. This mode is used when the output reset is needed to reset logic circuits and transistors.

The device also has an open-drain reset output which is used to provide reset signals to circuits connected to it. The output supports sinking loads of up to 24mA and has a 5V logic level. The output is active low and is triggered low when the supply voltage drops below the falling supply voltage threshold.

Conclusion

The XC6121A418ER-G from ON Semiconductor is a low-voltage supervisor ideal for power systems requiring reliable power-on reset and supply voltage monitoring. It operates with an input supply voltage of up to 30V and has excellent static protection to prevent damage. It supports two modes of operation, delayed reset and active reset, and has an open drain output which can sink loads of up to 24mA and provide reset signals to connected circuits.

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