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.