XC6124A446ER-G

The XC6124A446ER-G is a precision programmable voltage supervisor (monitor) IC developed and marketed by Toshiba. This device is a member of the XC6124 family of voltage supervisors offered by Toshiba, each with distinct characteristics and applications. The XC6124A446ER-G is intended for applications that require a low power reset and/or power supply monitoring that operates down to 0.8V. With a precision voltage detection and a third power supply terminal for direct reference connection, this IC is capable of providing a very accurate reset/monitoring threshold.

Application Field

The XC6124A446ER-G is suitable for a wide variety of applications including PCs, portable communication systems, and other applications that require a low power reset and/or power supply monitoring. The main features of this IC are its precision voltage detection, power supply terminals and a wide range of operating voltages. The precision voltage detection allows for a very accurate reset/monitoring threshold, as well as a third power supply terminal for direct reference connection, which allows for a range of voltages up to 0.8V.

An example of a common application of the XC6124A446ER-G is its use as a reset supervisor IC in PC systems. This application involves monitoring the system’s power rails (DC input voltage) for any variations that could cause system errors or instability. If a fall in voltage occurs, the IC will immediately assert its reset output, allowing for a graceful system shutdown and preventing any system damage or data loss.

Working Principle

The XC6124A446ER-G utilizes two circuits to achieve its reset/monitoring functions - a voltage detection circuit and a delay circuit. The voltage detection circuit is responsible for monitoring the voltage input and detecting any variations below the set threshold. This circuit is based on an internal band-gap reference generator, which produces a voltage source of 1.224V with a high degree of accuracy and stability. The threshold is set by connecting an external resistor between the VT (Threshold Voltage Setting) pin and the GND pin.

The delay circuit provides an adjustable reset delay time and prevents false actuation of the reset signal. This is done by delaying the reset signal for a period of time after the voltage drops below the threshold. The delay time is set by connecting an external capacitor to the RST pin and is adjustable from 0.3 ms to 409 ms.

Once the voltage detection circuit senses a drop in input voltage below the threshold, the delay circuit is activated. After the set delay time has elapsed, the reset output is asserted. This reset signal can be used to signal the system to safely shutdown and ensure any data is saved before powering off. If the input voltage rises above the threshold, the reset signal is de-asserted and the system functions normally.

Conclusion

The XC6124A446ER-G is a precision programmable voltage supervisor that is suitable for a wide variety of applications. This IC is designed to provide a low power reset and/or power supply monitoring solution operating down to 0.8V. It is capable of providing a very accurate reset/monitoring threshold, as well as a third power supply terminal for direct reference connection. Typical applications of the XC6124A446ER-G include PCs and other systems requiring a reliable and low power reset/monitoring solution.