Note The ”Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaran- teed The device should not be operated at. µA. VCC = MAX, VIN = V. IIH. In ut HIGH Current. mA. VCC = MAX, VIN = V. IIL. Input LOW Current. – mA. VCC = MAX, VIN = V. IOS. 74LS08 IC is a member of 74XXYY IC series. There are four AND gates in the chip and each gate have two inputs, hence the name.

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There are four AND gates in the chip, we can use one or all gates simultaneously. When both buttons are not pressed. The chip is available in different packages and is chosen depending on requirement.

A few mentioned below. Both transistors will be ON and voltage across both of them will be zero. TL — Programmable Reference Voltage. The two inputs of AND gate are driven out from bases of the two transistors. Because output is nothing but voltage across resistor R1 it will be LOW. The chip provides TTL outputs which are needed in some systems.

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Because total VCC appears across transistors the drop across resistor R1 will be zero. It is really popular and is available everywhere.

74LS08 – Quad 2-In AND Gate

At this time the total VCC appears across resistor R1. Because of this the chip can be used for high speed AND operations. The four AND gates in the chip mentioned earlier are connected internally dataseet shown in diagram below.

The circuit working can be explained in few stages below: When any one of the buttons is pressed. In this state the current flow through base of both transistors will be zero. In the circuit two transistors are connected in series to form a AND gate.

74LS08 Datasheet catalog

When both buttons are pressed. Submitted by admin on 6 April Output of the AND gate is the voltage across resistor R1. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur.


With that the drop across resistor R1 will be zero. The chip is basically used where AND datasheey operation is needed. The chip is used in systems where high speed AND operation is needed.

SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. After verifying the three states, you can tell that we have satisfied the fatasheet truth table.

74LS08 Datasheet, PDF – Alldatasheet

Not more than one output should be shorted at a time, nor for more than 1 second. For realizing the above truth 74ks08 let us take a simple AND gate application circuit as shown below.

This LED is connected to detect the state of output. The description for each pin is given below. For better understanding the internal working let us consider the simplified internal circuit of AND gate as shown below. These two inputs datashete connected to buttons to change the logic of inputs.