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HEF4047B - Monostable/astable multivibrator

Description

The HEF4047B consists of a gatable astable multivibrator incorporating logic techniques to permit positive or negative edge-triggered monostable multivibrator action with retriggering and external counting options.

Inputs include +TRIGGER, TRIGGER, ASTABLE, ASTABLE, RETRIGGER and MR (master reset).

Features

  • 2.1 General.
  • Monostable (one-shot) or astable (free-running) operation.
  • True and complemented buffered outputs.
  • Only one external resistor and capacitor required NXP Semiconductors HEF4047B Monostable/astable multivibrator 2.2 Monostable multivibrator.
  • Positive- or negative-edge triggering.
  • Output pulse width independent of trigger pulse duration.
  • Retriggerable option for pulse-width expansion.
  • Long pulse width possible using small RC components with externa.

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Full PDF Text Transcription

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HEF4047B Monostable/astable multivibrator Rev. 4 — 15 September 2014 Product data sheet 1. General description The HEF4047B consists of a gatable astable multivibrator incorporating logic techniques to permit positive or negative edge-triggered monostable multivibrator action with retriggering and external counting options. Inputs include +TRIGGER, TRIGGER, ASTABLE, ASTABLE, RETRIGGER and MR (master reset). Buffered outputs are O, O and OSCILLATOR OUTPUT. In all modes of operation an external capacitor (Ct) must be connected between CTC and RCTC, and an external resistor (Rt) must be connected between RTC and RCTC. A HIGH level on the ASTABLE input enables astable operation. The period of the square wave at O and O outputs is a function of the external components employed.
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