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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Datasheet – 74LS08
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The chip is available in different packages and is chosen depending on requirement. Because of this the chip can be used for high speed AND operations. For better understanding the internal working let us consider the simplified internal circuit of AND gate as shown below.
After verifying the three states, you can tell that we have satisfied the above truth table. Because output is nothing but voltage across resistor R1 it will be LOW.
Because total VCC appears across transistors the drop across resistor R1 will be zero. The circuit working can be explained in few stages below: Datashert LED is connected to detect the state of output. The four AND gates in the chip mentioned earlier are connected internally as shown in diagram below.
74LS08 datasheet, 74LS08 datasheets, manuals for 74LS08 electornic semiconductor part
The two inputs of AND gate are driven out from bases of the two transistors. Output of the AND gate is the voltage across resistor R1.
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At this time the total VCC appears across resistor R1. When both buttons are pressed. When any one of the buttons is pressed. In this state the current flow through base of both transistors 74l0s8 be zero.
74LS08 Datasheet, PDF – Alldatasheet
The chip provides TTL outputs which are needed in some systems. These two inputs are connected to buttons to change the logic of inputs. The chip is used in systems where high speed AND operation is needed. SCILLC products datazheet not designed, intended, or authorized for use as components in systems intended 74le08 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.
A few mentioned below. In the circuit two transistors are connected in series to form a AND gate.
When both buttons are not pressed. Not more than one output should be shorted at a time, nor for more than 1 second. There are four AND gates in the chip, we can use one or all gates simultaneously. The description for each pin is given below.
Both transistors will be ON and voltage across both of them will be zero. With that the drop across resistor R1 will be zero. It is really popular and is available everywhere. TL — Programmable Reference Voltage. The chip is basically used where AND logic operation is needed.
For realizing the above truth table let us take a simple AND gate application circuit as shown below.