CD4047 Gatable Astable Multivibrator

A versatile IC for astable and monostable multivibrator applications.

• Part number: CD4047B
• Technology Family: CD4000
• VCC (Min) (V): 3
• VCC (Max) (V): 18
• Channels (#): 1
• ICC @ nom voltage (Max) (mA): 600
• IOL (Max) (mA): 4
• IOH (Max) (mA): -4
• Input Type: Standard CMOS
• Output Type: Push-Pull
• Features: Balanced

Top Features:

• Low power consumption CMOS oscillator
• Monostable and astable operation
• True and complemented buffered outputs
• Only one external R and C required

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, an 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 of 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).

Monostable Multivibrator Features include 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, and fast recovery time essentially independent of pulse width.

Astable Multivibrator Features include free-running or gatable operating modes, 50% duty cycle, oscillator output available, and good astable frequency stability with frequency deviation of 2% + 0.03%/C @ 100 kHz and 0.5% +0.015%/C @ 10 kHz.

Applications:

• Digital equipment with low-power dissipation
• High noise immunity design requirements
• Envelope detection
• Frequency multiplication
• Frequency division
• Frequency discriminators
• Timing circuits
• Time-delay applications

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Images are for illustration only; actual product may vary.