XC6121E527MR-G

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:	2.7V
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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PMIC - Supervisors

The XC6121E527MR-G is a member of NEC Electronics\' X-Series of undervoltage supervisor and reset ICs. Its primary purpose is to monitor a power supply voltage, and actuate a reset signal if this drops too low. It can be used in almost any system that might see sudden or gradual power supply drops, and it has a range of features that make it far more than a basic voltage monitor.The XC6121E527MR-G is a three-terminal device that monitors the power supply voltage and compares it with a preset reference level. It then decides if a power supply warning or reset is needed, and actuates an open-collector reset signal. The three terminals carry an Input voltage (VIN), Ground, and Reset. If a power supply dip occurs, the IC generates a reset signal when the voltage falls below the trip point. The reset signal is inverted logic, so a ‘low’ reset voltage represents an active reset. To protect against any false reset, the reset actuation time exceeds the power supply dip time.The XC6121E527MR-G is a very versatile device with a wide range of features that enrich its applications. It provides power supply voltage monitoring, low current consumption, open-drain reset output, reset hysteresis, and reset-active voltage selection. For example, the XC6121E527MR-G features a built-in delay time function, which can be used to prevent false resets occurring due to momentary power supply dips.The XC6121E527MR-G is able to detect a range of input voltages, from as low as 2.2V up to 6.5V. This makes it suitable for applications such as logic electronic systems, computers and microprocessors, electronic instruments and electrical app appliances. This device is particularly suited for systems that require periodic reset functions, since it can actuate reset signals at the exact power supply levels desired. The reset function can then be used to initialize a system or clear the RAM, providing greater overall system reliability.The XC6121E527MR-G can also be used to guard against more permanent undervoltage occurrences. If the system voltage dips too low, due to supply wiring problems or lightning strikes, the device will detect the dip and actuate a reset signal. This then prevents the system from operating in unsafe or volatile conditions, and protects it from further damage.An additional feature of the XC6121E527MR-G is that it has a high-speed response time of 15μs to the voltage changes, allowing for quick and accurate reset actuation. This further enhances the device’s reliability, as the reset signal will be actuated the instant the power supply level drops too low.Finally, the XC6121E527MR-G has in-built hysteresis, which helps to alleviate any incorrect reset actuations. The hysteresis level is adjustable, allowing for reset active points to be fine-tuned to suit a certain operational level. This is achieved by changing the values of external resistors or capacitors, allowing the reset function to be tailored to suit any special applications or requirements.In summary, the XC6121E527MR-G is a versatile and highly-efficient undervoltage supervisor and reset IC. Its wide range of features, long list of applications, and high-speed response make it a great choice for any system that requires reliable power supply monitoring and reset functionality.

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