NCP301HSN45T1 데이터 시트보기 (PDF) - ON Semiconductor

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NCP301HSN45T1

Voltage Detector Series

ON Semiconductor 

NCP300, NCP301

VCC TRANSIENT REJECTION

The NCP300 and NCP301 series provides accurate VCC

monitoring and reset timing during power−up,

power−down, and brownout/sag conditions, and rejects

negative glitches on the power supply line. Figure 22 shows

the maximum transient duration vs. maximum negative

excursion (overdrive) for glitch rejection. Any combination

of duration and overdrive which lies under the curve will not

generate a reset signal. A below−VCC condition (on the

right) is detected as a brownout or power−down. Typically,

any transient that goes 100 mV below the reset threshold and

lasts 5.0 ms or less will not cause a reset pulse.

Transient immunity can be improved by adding a

capacitor in close proximity to the VCC pin of the NCP30x.

VCC

VTH

Overdrive

Duration

Figure 22. Max Transient Duration vs. Max Overdrive

300

250

200

150

100

50

0

10

VTH = 4.90 V

VTH = 3.10 V

VTH = 1.60 V

30 50 70 90 110 130 150

RESET COMPARATOR OVERDRIVE

Figure 23.

PROPAGATION DELAY VARIATION

On the other hand (see above paragraph), a minimum

overdrive value from Vthreshold to VCC must be respected.

That means Vin (minimum value of VCC) must be higher

enough than VDET+ (VDET− + hysteresis) at the risk of

significantly increasing propagation delay. (Figure 24) This

propagation delay is temperature sensitive.

To avoid acceptable time response, a minimum 100 mV

difference between Vin and VDET+ must be selected.

VDET+

600

500

400

300

tpHL

200

tpLH

100

0

3.0 3.168 3.5

4.0

4.5

5.0

5.5

Vin, PULSE HIGH INPUT VOLTAGE (V)

Figure 24. tpLH and tpHL vs. Input Voltage

for the NCP301SNT1

http://onsemi.com

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