ic CD4047

We can use the CD4047B either the monostable or astable mode. It is easy to use. With a few external components, capacitor (between pins 1 and 3) and a resistor
(between pins 2 and 3) to determine the output pulse width
in the monostable mode, and the output frequency in the
astable mode.

Features :

Wide supply voltage range: 3.0V to 15V
Noise protection: 0.45 VDD (Typical)
Low power TTL compatibility
Low power consumption CMOS oscillator
Monostable (one-shot) or astable (free-running) operation
Astable Multivibrator
Free-running 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%)
Difference between 555 & CD4047
First of all, the shape is noticeably different, the NE555 has 8 pins and CD4047 has 14 pins. The CD4047 starts at 3V supply.

If the focus is on the Astable multivibrator circuit. CD4047 requires only 2 devices, Resistor, and Capacitor only.

And more importantly, it has a duty cycle at 50% in a symmetrical standard, no need for additional equipment.

It is therefore suitable for generating a set frequency in inverter circuit.

Pin No. Pin Name Description

1 Cap timing (C) Connect External Capacitors to this pin between Res timing and Rcc.
2 Res timing (R) Connect External resistor to this pin between Cap timing and Rcc.
3 RC common (RCC) This is a common terminal point between Rc and C
4 ~Astable The LOW signal level at this input enables the Astable operation.
5 Astable The HIGH signal level at this input enables the Astable operation.
6 -Trigger Monostable operation enables when the signal at this input is triggers by high to low transition.
7 Vss Ground of the circuit
8 +Trigger Monostable operation is enabled when the signal at this input is triggered by low to high transition.
9 External Reset When the reset input connects with the HIGH level, it resets the output Q to 0 and the non-inverting output to 1.
10 Q Non-inverting output
11 ~Q Inverting Output
12 Retrigger Used to trigger pin 7 and pin 8 pins simultaneously in monostable mode
13 OSC Output It gives oscillated output in astable mode.
14 Vdd Positive power supply

How to use the CD4047 IC in Monostable Mode :

The CD4047 IC can be operated in monostable and astable modes. It can be operated as a monostable mode by connecting a capacitor between the pins 1 and 3.

Applications :

• The primary applications of the CD4047 IC are given below.
• Envelope Detection
• Frequency Multiplication
• Frequency Division
• Time Delay Circuits
• Frequency Discriminators
• Timing Circuits