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HEF4047B

Monostable/astable multivibrator

Philips Electronics 

Philips Semiconductors

Monostable/astable multivibrator

Product specification

HEF4047B

MSI

1. Astable mode design information

a. Unit-to-unit transfer-voltage variations

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

running (astable) operation.

Fig.4 Astable mode waveforms.

t1 = –RtCt In -V----D---D--V---+-T---R-V----T---R--

t2 = –RtCt In -2-V--V---D--D-D--D---–--–---V-V---T--T-R--R-

tA = 2 (t1 + t2) = –2RtCt In --(--V----D---(-D--V---+-T---R-V---)-T---R(---V-)---D-(---D2---V-–----D-V--D--T---–R----)-V----T---R---)-- , where tA = Astable mode pulse width.

Values for tA are:

VDD = 5 or 10 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;

tA = 4,40 RtCt

tA = 4,71 RtCt

tA = 4,71 RtCt

tA = 4,84 RtCt

tA = 4,84 RtCt

thus if tA = 4,40 RtCt is used, the maximum variation will be (+ 7,0%; −0,0%) at 10 V.

January 1995

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