CD4047 consists of a gatable astable multivibrator with logic techniques incorporated to permit positive or negative edge-triggered monostable multivibrator action with retriggering and external counting options.

Inputs include +TRIGGER, -TRIGGER, ASTABLE, ASTABLE\, RETRIGGER, and EXTERNAL RESET. Buffered outputs are Q\, Q and OSCILLATOR. In all modes of operation, and external capacitor must be connected between C-Timing and RC-Common terminal, and an external resistor must be connected between the R-Timing and RC-Common terminals.

Astable operation is enabled by a high level on the STABLE input or a low level on the ASTABLE\ input, or both. The period of the square wave at the Q and Q\ Outputs in this mode off operation is a function of the external components employed. "True" input pulses on the ASTABLE input 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 Q terminal output in the astable mode. However, a 50% duty cycle is not guaranteed at this output.

The CD4047 triggers in the monostable mode when a positive-going edge occurs on the +TRIGGER-input while the -TRIGGER is held low. INput pulses may be of any duration relative to the output pulse.

The CD4047-Series types are supplied in 14-lead hermetic dual-in-line ceramic packages (F3A suffix), 14-lead dual-in-line plastic packages (E suffix), 14-lead small outline packages (M, MT, M96, and NSR suffixes), and 14-lead thin shrink small-outline packages (PW and PWR suffixes).

Features:-

• Lower power consumption: special CMOS oscillator configuration
• Monostable (one-shot) or astable (free-running) operation
• True and complemented buffered outputs
• Only one external R anc C required
• Buffered inputs
• 100% tested for quiescent current at 20 V
• Standardized, symmetrical output characteristics
• 5-V, 10-V, and 15-V parametric ratings
• Meets all requirements of JEDEC Tentative Standard No. 13B, "Standard Specifications for Description of 'B' Series CMOS Devices"
• Monostable Multivibrator Features:
  • Positive-or negative-edge trigger
  • Output pulse width independent of trigger pulse duration
  • Retriggerable option for pulse width expansion
  • Internal power-on reset circuit
  • Long pulse widths possible using small RC components by means of external counter provision
  • Fast recovery time essentially independent of pulse width
  • Pulse-width accuracy maintained at duty cycles approaching 100%
• Astable Multivibrator Features:
  • Free-running or gatable operating modes
  • 50% duty cycle
  • Oscillator output available
  • Good astable frequency stability:
    Frequency deviation:
    = ±2% + 0.03%/°C @ 100 kHz
    = ±0.5% +0.015%/°C @ 10 kHz (circuits "trimmed" to frequency V_DD = 10 V ± 10%)
• Applications:
  Digital equipment where low-power dissipation and/or high noise immunity are primary design requirements:
  • Envelope detection
  • Frequency multiplication
  • Frequency division
  • Frequency discriminators
  • Timing circuits
  • Time-delay applications

Specifications:-

Related Document:-

 CD4047 IC Datasheet