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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Because output is nothing but voltage across resistor R1 it will be LOW. The chip is basically used where AND logic operation is needed. The circuit working can be explained in few stages below: The description for each pin is given below.
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74LS08 Datasheet(PDF) – Fairchild Semiconductor
These two inputs are connected to buttons to change the logic of inputs. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, catasheet claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part.
When any one of the buttons is pressed. In this state the current flow through base of both transistors will be zero. The chip is used in systems where high speed AND operation is needed. With that the drop across resistor R1 dattasheet be zero. When both buttons are pressed. Because of this the chip can be used for high speed AND operations.
There are four AND gates in the chip, we can use one or all gates simultaneously. The four AND gates in the chip mentioned earlier are connected internally as shown in diagram below.
74LS08 datasheet
TL — Programmable Reference Voltage. Output of the AND gate is the voltage across resistor R1.
At this time the total VCC appears across resistor R1. It is really popular and is available everywhere. The chip provides TTL outputs which are needed in some systems. Because total VCC appears across transistors the drop across resistor R1 will be zero.
Submitted by admin on 6 April This LED is connected to detect the state of output. The chip is available in different packages and is chosen depending on requirement. After verifying the three states, you can tell that we have satisfied the above truth table.
Both transistors will be ON and voltage across both of them will be zero. 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. In the circuit two transistors are connected in series to form a AND gate.
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. Not more than one dataseet should be shorted at a time, nor for more than 1 second. For better understanding the internal working let us consider the simplified internal circuit of AND gate as shown below.
A few mentioned below. When both buttons are not pressed.