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HEF4047B

Monostable/astable multivibrator

Philips Electronics 

Philips Semiconductors

Monostable/astable multivibrator

Product specification

HEF4047B

MSI

Astable operation is enabled by a HIGH level on the

ASTABLE input. The period of the square wave at O and

O outputs is a function of the external components

employed. ‘True’ input pulses on the ASTABLE or

‘complement’ pulses on the ASTABLE input, allow the

circuit to be used as a gatable multivibrator. The

OSCILLATOR OUTPUT period will be half of the O output

in the astable mode. However, a 50% duty factor is not

guaranteed at this output.

In the monostable mode, positive edge-triggering is

accomplished by applying a leading-edge pulse to the

+ TRIGGER input and a LOW level to the − TRIGGER

input. For negative edge-triggering, a trailing-edge pulse is

applied to the − TRIGGER and a HIGH level to the

+ TRIGGER. Input pulses may be of any duration relative

to the output pulse. The multivibrator can be retriggered

(on the leading-edge only) by applying a common pulse to

both the RETRIGGER and + TRIGGER inputs. In this

mode the output pulse remains HIGH as long as the input

pulse period is shorter than the period determined by the

RC components.

An external count down option can be implemented by

coupling O to an external ‘N’ counter and resetting the

counter with the trigger pulse. The counter output pulse is

fed back to the ASTABLE input and has a duration equal

to N times the period of the multivibrator. A HIGH level on

the MR input assures no output pulse during an ON-power

condition. This input can also be activated to terminate the

output pulse at any time. In the monostable mode, a HIGH

level or power-ON reset pulse must be applied to MR,

whenever VDD is applied.

HEF4047BP(N): 14-lead DIL; plastic

(SOT27-1)

HEF4047BD(F): 14-lead DIL; ceramic (cerdip)

(SOT73)

HEF4047BT(D): 14-lead SO; plastic

(SOT108-1)

( ): Package Designator North America

Fig.2 Pinning diagram.

January 1995

3

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