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HEF4047B

Monostable/astable multivibrator

Philips Electronics 

Philips Semiconductors

Product specification

Monostable/astable multivibrator

HEF4047B

MSI

2. Monostable mode design information

The following analysis presents worst case variations from unit-to-unit as a function of transfer-voltage (VTR) shift for

one-shot (monostalbe) operation.

Fig.7 Monostable waveforms.

t1‘ = –RtCt In 2---V-V----T-D--R-D--

tM = ( t1' + t2)

tM = –RtCt In -(---2(---V-V---T-D--R--D--)---–-(---VV----DT---R-D---)--–--(--V-2---T-V---R-D--)--D---)- , where tM = Monostable mode pulse width.

Values for tM are:

VDD = 5 to10 V

VDD = 15 V

typ. :

min. :

max.:

min. :

max.:

VTR = 0,5 VDD;

VTR = 0,3 VDD;

VTR = 0,7 VDD;

VTR = 4 V;

VTR = 11 V;

tM = 2,48 RtCt

tM = 2,78 RtCt

tM = 2,52 RtCt

tM = 2,88 RtCt

tM = 2,56 RtCt

Note

1. In the astable mode, the first positive half cycle has a duration of tM; succeeding durations are 1⁄2 tA.

thus if tM = 2,48 RtCt is used, the maximum variation will be (+ 12%; −0,0%) at 10 V.

January 1995

11

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