HEF4047BP datasheet(11/15 Pages) PHILIPS

Part #	HEF4047BP

Description	Monostable/astable multivibrator

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Manufacturer	PHILIPS [NXP Semiconductors]

Direct Link	http://www.nxp.com

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11 / 15 page

January 1995

11

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.

Values for tM are:

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.

typ. : VTR = 0,5 VDD;tM = 2,48 RtCt

VDD = 5 to10 V

min. : VTR = 0,3 VDD;tM = 2,78 RtCt

max.: VTR = 0,7 VDD;tM = 2,52 RtCt

VDD = 15 V

min. : VTR =4 V;

tM = 2,88 RtCt

max.: VTR = 11 V;

tM = 2,56 RtCt

Fig.7 Monostable waveforms.

t

1 ‘Rt Ct In

V

TR

2V

DD

--------------

–

=

t

M

t

1'

t

2

+

()

=

t

M

R

t Ct In

V

TR

() V

DD

V

TR

–

()

2V

DD

V

TR

–

() 2V

DD

()

------------------------------------------------------------

, where t

M

Monostable mode pulse width.

=

–

=

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