HEF4047BP datasheet(13/15 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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13 / 15 page

January 1995

13

Philips Semiconductors

Product speciﬁcation

Monostable/astable multivibrator

HEF4047B

MSI

5. Timing component limitations

The capacitor used in the circuit should be non-polarized and have low leakage (i.e. the parallel resistance of the

capacitor should be an order of magnitude greater than the external resistor used).

There is no upper or lower limit for either Rt or Ct value to maintain oscillation.

However, in consideration of accuracy, Ct must be much larger than the inherent stray capacitance in the system (unless

this capacitance can be measured and taken into account).

Rt must be much larger than the LOCMOS ‘ON’ resistance in series with it, which typically is hundreds of ohms.

The recommended values for Rt and Ct to maintain agreement with previously calculated formulae without trimming

should be:

Ct ≥ 100 pF, up to any practical value,

10 k

Ω≤ Rt ≤ 1 MΩ.

6. Power consumption

In the standby mode (monostable or astable), power dissipation will be a function of leakage current in the circuit.

For dynamic operation, the power needed to charge the external timing capacitor Ct is given by the following formulae:

Because the power dissipation does not depend on Rt, a design for minimum power dissipation would be a small value

of Ct. The value of R would depend on the desired period (within the limitations discussed previously).

Typical power consumption in astable mode is shown in Figs 10, 11 and 12.

Astable mode:

P = 2 Ct V2 f (f at output pin 13)

P = 4 Ct V2 f (f at output pins 10 and 11)

Monostable mode:

P=

29 C

t V

2

,





duty cycle

()

T

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

f at output pins 10 and 11

()

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