IC 4047: CMOS Low Power Monostable/Astable Multi-vibrator

21 February 2018 - 0 Comments

IC 4047: CMOS Low Power Monostable/Astable Multi-vibrator

4047 IC Pinout

引脚配置

Pin No.	Pin Name	Description
1	C	Used to connect external capacitor
2	R	Used to connect external resistor
3	RCC	将电阻和电容器连接到它的常见引脚
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	+触发器	当以单稳定模式使用时，我们会低到高过渡到此引脚
9	EXT RESET	这是一个外部重置别针。通过对此销的高脉冲，它将输出Q重置为低和Q'
10	Q	Give normal high output
11	问’	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出来	Gives oscillated output
14	Vdd	Positive input pin of IC

Features

Power Consumption is low
提供单稳号（一声）和不可分割的（免费运行）操作
High noise immunity
Only one resistor and capacitor required externally
Standardized, symmetrical output characteristics

Monostable Features

Retriggerable option for pulse width expansion
正和负边触发
Output pulse width independent of trigger pulse duration

Astable Features

Free running operating modes
50％占空比
Oscillator output available
频率稳定性很好

Technical Specification

广泛的供应输入：3V至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:完整的技术信息可以在4047 IC数据表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 aleyu乐鱼官网入口 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:

4017 IC以敏捷模式

The formula for finding the value of oscillated output frequency (from PIN 13) mathematically is:

OSC出来Frequency= 1/4.4RC

Formula for finding the pulse duration is:

t = 2.48RC

Monostable mode

If you want to use the IC in Monostable mode you have to use the +trigger and –trigger PIN. By giving Low to High transition at +trigger PIN and High to Low transition at –trigger PIN you wil be able to get a Monostable output. The circuit is given below to use the IC in Monostable mode:

4047 IC in Monostable Mode