NCP803 데이터 시트보기 (PDF) - ON Semiconductor

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NCP803

Very Low Supply Current 3-Pin Microprocessor Reset Monitor

ON Semiconductor 

MAX803 Series, NCP803 Series

Detail Operation Description

The MAX803, NCP803 series microprocessor reset

supervisory circuits are designed to monitor the power

supplies in digital systems and provide a reset signal to the

processor without any external components. Figure 2 shows

the timing diagram and a typical application below. Initially

consider that input voltage VCC is at a nominal level greater

than the voltage detector upper threshold (VTH). And the

RESET (RESET) output voltage (Pin 2) will be in the high

state for MAX803 and NCP803 devices. If there is an input

power interruption and VCC becomes significantly

deficient, it will fall below the lower detector threshold

(VTH-). This event causes the RESET output to be in the low

state for the MAX803 and NCP803 devices. After

completion of the power interruption, VCC will rise to its

nominal level and become greater than the VTH. This

sequence activates the internal oscillator circuitry and

digital counter to count. After the count of the timeout

period, the reset output will revert back to the original state.

Input Voltage

VVCTHC+

VTH–

Reset Output

MAX803, NCP803

VCC

VTH–

0V

Reset Output

MAX810

VCC

VTH–

0V

tRP

Figure 12. Timing Waveforms

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