NCP302 datasheet(18/26 Pages) ONSEMI

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NCP302, NCP303

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Figure 41. Microprocessor Reset Circuit with Additional Hysteresis

NCP301

LSN27T1

VDD

GN-

Reset Output

Input

NCP301

LSN27T1

GN-

NCP303

LSN27T1

GN-

Reset

VDD

Microprocessor

Comparator hysteresis can be increased with the addition of

resistor RH. The hysteresis equations have been simplified and

do not account for the change of input current Iin as Vin crosses

the comparator threshold. The internal resistance, Rin is simply

calculated using Iin = 0.26 mA at 2.6 V.

Vin Decreasing:

th +

) 1 V

DET

Vin Increasing:

th +

in ø RL

) 1 V

DET

* ) VHYS

VHYS = Vin Increasing − Vin Decreasing

Test Data

Vth Decreasing

(V)

Vth Increasing

(V)

VHYS

(V)

(

2.70

2.84

2.87

2.88

2.91

2.90

2.94

2.98

2.70

3.04

3.15

0.135

0.17

0.19

0.21

0.20

0.24

0.28

0.27

0.34

0.35

100

220

470

−

6.8

4.3

6.8

4.3

6.8

4.3

Figure 42. Simple Clock Oscillator

NCP301

LSN27T1

GN-

Reset Output

Input

82 k

NCP301

LSN27T1

GN-

NCP302

HSN27T1

GN-

5.0 V

100 k

C (

mF)

fOSC (kHz)

IQ (mA)

0.01

2590

21.77

0.1

490

21.97

1.0

22.07

Test Data

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