4047 Low Power Monostable/Astable Vibrator

Pin Configuration
Pin No. Pin Name Description
1 C Used to connect external capacitor
2 R Used to connect external resistor
3 RCC Common pin for connecting resistor and capacitor to it
4 AST’(Astable bar) Low when used in Astable mode
5 AST High when used in Astable mode
6 -Trigger When used in Monostable mode we give High to Low transition to this pin
7 Vss Ground pin of IC
8 +Trigger When used in Monostable mode we give Low to High transition to this pin
9 EXT RESET It’s an external reset pin. By giving a high pulse to this pin, it resets the output Q to low and Q’ to high
10 Q Give normal high output
11 Q’ Inverse output of pin 10, means it gives low output
12 Retrigger Used in Monostable mode to simultaneously retrigger +trigger and –trigger pin
13 OSC Out Gives oscillated output
14 Vdd Positive input pin of IC
Features
Power Consumption is low
Provide Monostable (one-shot) and Astable (free running) operation
High noise immunity
Only one resistor and capacitor required externally
Standardized, symmetrical output characteristics
Monostable Features
Retriggerable option for pulse width expansion
Positive and negative edge trigger
Output pulse width independent of trigger pulse duration
Astable Features
Free running operating modes
50% duty cycle
Oscillator output available
Astable frequency stability is good
Technical Specification
Wide range of supply input: 3v to 18v
Operating temperature range: −55°C to +125°C
Storage temperature range: −65°C to +150°C
DC input current: ±10mA
Soldering Lead temperature: 260°C ( for 10s max)
Note: Complete technical information can be found in the 4047 IC Datasheet linked at the bottom of this page.

Where to use 4047 IC?
We can use the IC in both Astable and Monostable mode, for making different circuit. The IC can be used for generating clock pulse, sine wave, square wave and many others. It can also be used in application of timing delay circuits, frequency multiplier and frequency divider. To generate an envelope signal from the original signal this IC is helpful.

How to use 4047 IC?
It needs an external resistor to be connected between PIN 1 and 3 to determine the output pulse width in Monostable mode. For determining Output frequency in Astable mode, it needs a capacitor to be connected between PIN 2 and 3.

Astable mode
If you want to use the IC in Astable mode, you need to HIGH the PIN 5 and LOW the PIN 4. So that you will be able to get constantly fluctuating output between HIGH and LOW. Here, the circuit is given below for Multivibrator in Astable mode: