74LS04 - Hex Inverting Gates

2018年4月4日 - 0 Comments

74LS04 - NOT Gate IC

74LS04 Pinout

74LS04is a member of 74XXYY IC series. The 74-series are digital logic integrated circuits.
74LS04 IChas六个不是大门。These NOT gates perform Inverting function. Hence name HEX INVERTING GATES.

74LS04 Pin Configuration

74LS04是A14引脚IC，如图所示74LS04 pinout。此IC在各种软件包中可用。根据要求选择适当的包裹。每个引脚的描述在下面给出。

Pin Number	Description
反相门的输入
1	1A-INPUT of GATE 1
3	2A-INPUT of GATE 2
5	3A-INPUT of GATE 3
9	4A-INPUT of GATE 4
11	5A-INPUT of GATE 5
13	6A-INPUT of GATE 6
SHARED TERMINALS
7	GND- Should be connected to ground
14	VCC-Should be connected to positive voltage
OUTPUT OF INVERTING GATES
2	1 y-output门1
4	2Y-OUTPUT of GATE 2
6	3Y-OUTPUT of GATE 3
8	4Y-OUTPUT of GATE 4
10	门5的5 y输出
12	6Y-OUTPUT of GATE 6

74LS04功能和规格

电源电压范围： +4.75V至 +5.25V
最大的电源电压:+ 7 v
Maximum current allowed to draw through each gate output: 8mA
Totally lead free
TTL outputs
MaximumRise Time: 15ns
Maximum Fall Time: 15ns
Operating temperature:0°C to 70 °C

Note:完整的技术信息可以在74LS04 Datasheetlinked at the bottom of this page.

74LS04 Equivalents

CD7404、74LS14，可以配置单个晶体管以形成不栅极。

Where to Use 74LS04 IC?

Here are few cases where 74LS04 is used.

1.在需要逻辑逆变器的情况下，基本上使用芯片。此芯片中的逆变器门提供了否定逻辑输入的输出。芯片有六个不操作的门。

2. When you want TTL outputs. The gates in this chip provide TTL logic outputs which are a must in some applications.

3. 74LS04是市场上可用的低成本芯片，因此当应用成本低时使用它。

How to use 74LS04

如前面提到的74LS04hassix INVERTING GATESwhich can be used individually. The internal connection of gates can be given as below.

74LS04 Internal Structure

Now let us take a single gate of the six and connect it as shown in circuit diagram.

Using Single NOT gate 74LS04 IC

For understanding theworking of NOT gate,let’s redraw it in more simplified version.

74LS04非门电路

As shown in diagram, we have a transistor forming a NOT gate. Input here is 1A which is connected to button. Output 1Y is connected to LED through a resistor. The LED is connected to know the output status.

在电路中，

When button is not pressed:

Current through base of transistor will be zero. Because base current is zero the transistor will be in OFF state. Under OFF sate the total supply voltage appears across the transistor.Under such case the output 1Y here will be HIGH, since output is nothing but voltage across transistor. Hence when button is not pressed INPUT 1A = LOW and OUTPUT 1Y = HIGH.

When button is pressed:

Voltage appears at base of transistor and current flows through it. Because base current is present the transistor will turn ON. Under ON sate the total supply voltage appears across the resistor and voltage across transistor will be zero. Under such case the output 1Y here will also be LOW, since output is nothing but voltage across transistor. Hence when button is pressed INPUT 1A = HIGH and OUTPUT 1Y = LOW.

If we draw truth table based on above cases, we will have.