CD4047 Mono-stable/A-stable Multi-vibrator - Datasheet

The CD4047B is capable of operating in either the monostable or astable mode. The IC is made by using the Complementary MOS (CMOS) technology, integrated with p-type and n-type enhancement moe transistors. It requires an external capacitor and an external resistor (between pins 2 and 3) to determine the output pulse width in the monostable mode, and the output frequency in the astable mode. Astable operation is enabled by a high level on the astable input or a low level on the astable input. Monostable operation is obtained when the device is triggered by LOW-to-HIGH transition at + trigger input or HIGH-to-LOW transition at − trigger input. The output of the IC always comes in TTL which makes it easy to work with other TTL devices and microcontrollers.

Monostable Multivibrator

A monostable multivibrator (MMV), often called a one-shot multivibrator, is a pulse generator circuit in which the duration of the pulse is determined by the R-C network, connected externally to the 555 timers. In such a vibrator, one state of output is stable while the other is quasi-stable (unstable). For auto-triggering of output from a quasi-stable state to a stable state, energy is stored by an externally connected capaci­tor to a reference level. The time taken in storage determines the pulse width.

Astable Multivibrator

An astable multivibrator is a free-running oscillator that switches continuously between its two unstable states. With no external signal applied, the transistors alternately switch from cutoff to saturation state at a frequency that RC time constants of the coupling circuit determine. If these time constants are equal (R and C are equal) then a square wave will generate with a frequency of 1/1.4 RxC. Hence, an astable multivibrator is also a pulse generator or a square wave generator.

CD4047 Key Features

• Wide supply voltage range: 3.0V to 15V
• High noise immunity: 0.45 VDD (typ.)
• Low power TTL compatibility: Fan out of 2 driving 74L or 1 driving 74LS

Special Features

• Low power consumption: special CMOS oscillator configuration
• Monostable (one-shot) or astable (free-running) operation
• True and complemented buffered outputs
• Only one external R and C required

Monostable Multivibrator

• Positive- or negative-edge trigger
• Output pulse width independent of trigger pulse duration
• Retriggerable option for pulse width expansion
• 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

• Free-running or gatable operating modes
• 50% duty cycle
• Oscillator output available
• Good astable frequency stability
  • typical= ±2% + 0.03%/°C @ 100 kHz
  • frequency= ±0.5% + 0.015%/°C @ 10 kHz
  • deviation (circuits trimmed to frequency VDD = 10V ±10%)

CD4047 Pinout

Application

• Frequency discriminators
• Timing circuits
• Time-delay applications
• Envelope detection
• Frequency multiplication
• Frequency division

CD4047 Datasheet

You can download the datasheet for CD4047 Monostable/Astable Multivibrator IC from the link given below:

See Also: CD4555 Dual Binary 1 of 4 Decoder – Datasheet | CD40110 Decade Up/Down Counter – Datasheet | CD4503 Tri-state Hex Buffer – Datasheet