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.
There are four AND gates datashewt the chip, we can use one or all gates simultaneously. The description for each pin is given below. The chip is available in different packages and is chosen depending on requirement. Output of the AND gate is the voltage across resistor R1.
For better understanding the internal working let us consider the simplified internal circuit of AND gate as shown below.
74LS08 Datasheet(PDF) – Fairchild Semiconductor
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At this time the total VCC appears across resistor R1. In this state the current flow through base of both transistors will be zero.
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This LED is connected to detect the state of output.
Because total VCC appears across transistors the drop across resistor R1 will be zero. In the circuit two transistors are connected in series to form a AND gate. With that the drop across resistor R1 will be zero.
When both buttons are pressed. TL — Programmable Reference Voltage.
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The chip is basically used where AND logic operation is needed. A few mentioned below.
Because of this the chip can be used for high speed AND operations. Both transistors will be ON and voltage across both of them will be zero.
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The chip is used in systems where high speed AND operation is needed. The four AND gates in the chip mentioned earlier are connected internally as shown in dstasheet below. The two inputs of AND gate are driven out from bases of the two transistors. For realizing the above truth table let us take a simple AND gate application circuit as shown below.
Calaméo – Datasheet – 74LS08
When any one of the buttons is pressed. The chip provides TTL outputs which are needed in some systems. Not more than one output should be shorted at a time, nor for more than 1 second.
Submitted by admin on 6 April The circuit working can be explained in few stages below: These two inputs are connected to buttons to change the logic of inputs. Because output is nothing but voltage across resistor R1 it will be LOW. When both buttons are not pressed. After verifying the three states, you can tell that we have satisfied the above truth table.