XC6122A540MR-G Integrated Circuits (ICs)

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
Type:	Watchdog Circuit
Number of Voltages Monitored:	1
Output:	Open Drain or Open Collector
Reset:	Active Low
Reset Timeout:	400 ms Typical
Voltage - Threshold:	4V
Operating Temperature:	-40°C ~ 85°C (TA)
Mounting Type:	Surface Mount
Package / Case:	SC-74A, SOT-753
Supplier Device Package:	SOT-25

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Introduction to XC6122A540MR-G The XC6122A540MR-G is a low-saturation voltage supervisory device manufactured by ON Semiconductor. This device operates as an override protection to control overvoltages or undervoltage conditions in the system. It is designed to support a wide range of demanding applications, such as automotive, industrial, medical, and consumer electronics. The device monitors the voltage level of an applied operating system (OS) supply, and is designed to protect the system from out-of-spec conditions that may lead to system damage.Application Fields of XC6122A540MR-G The XC6122A540MR-G is most commonly used in automotive, industrial, and medical power supplies. It can be used to protect against overvoltage and undervoltage conditions in these systems. Additionally, the device is suitable for use in power supplies for consumer electronics and computer systems.Features of XC6122A540MR-G The XC6122A540MR-G offers wide range of features to provide a robust level of protection for a system. This device is offered in an SOIC or USON package, and is RoHS compliant. The device provides excellent hysteresis over voltage and temperature, and the thresholds are accurately defined by a means of a single external resistor. It can operate on supply voltages ranging from 2.3V to 5.5V. The device also provides excellent power supply noise rejection, with a rapidly responding shutdown function in the event of an overvoltage or undervoltage fault.Working Principle of XC6122A540MR-G The XC6122A540MR-G operates over a wide range of operating conditions, from 2.3V to 5.5V. Its output is formed by comparing an internally generated reference signal level against an external signal. The output is active-low and is set to indicate a fault condition when the external voltage falls below the specified undervoltage threshold or rises above the specified overvoltage threshold.The main function of the XC6122A540MR-G is to supervise the voltage level applied to the system, and provide a reliable protection from out-of specification supply voltages. If the input voltage rises above the overvoltage threshold or falls below the undervoltage threshold, the output is asserted low. If any of the other input signal are also active, the output may remain in high impedance state. In order to provide the correct undervoltage and overvoltage thresholds, an external resistor is connected between the VREF pin and the Vth pin. The required voltage level at the Vth pin is selected to be higher than the undervoltage threshold and lower than the overvoltage threshold. The resistor value is then entered into the following equation:R=VREF/(Vth-Vout)The value of resistor should be selected such that the output is properly driven low when the input crosses the specified threshold.Conclusion The XC6122A540MR-G is a low-saturation voltage supervisory device manufactured by ON Semiconductor which operates as an override protection circuit to control overvoltage and undervoltage conditions in the systems. The device is suitable for use in automotive, industrial, medical and consumer electronic applications. It features an internal reference signal which is compared to an external signal to generate an active-low output at the fault condition. The XC6122A540MR-G is offered in an SOIC or USON package and is RoHS compliant.

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