HEF Datasheet, HEF PDF, HEF Data sheet, HEF manual, HEF pdf, HEF, datenblatt, Electronics HEF, alldatasheet, free. Oct 11, DATASHEET. Features. • High-Voltage Types (20V Rating). • CDBMS Triple 3-Input AND Gate (No longer available or supported). Data sheet acquired from Harris Semiconductor. SCHSC – Revised September The CDB, CDB, and CDB types are supplied in .

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The circuit working can be explained in few stages below: Because of this the chip can be used for high speed AND operations. With that the drop across resistor R1 will be zero. For better understanding the internal working let us consider the simplified internal circuit of AND gate as shown datsaheet.

The two inputs of AND gate are driven out from bases of the two transistors. The second will require only one IC, but only two gates can be made. The chip provides TTL outputs which are needed in some systems.

TL — Programmable Reference Voltage. These two inputs are connected to buttons to change the logic of inputs. The first is to use a NAND gate and invert the output.

Because total VCC appears across transistors the drop across resistor R1 will hf4081 zero. AND gates with more inputs can be made up from the or any of the above ICs by cascading them together. The chip is used in systems where high speed AND operation is needed. A selection of different manufacturers’ datasheets is given below:. The four AND gates in the chip mentioned earlier are connected internally as shown in diagram below.


The truth table for one of the four gates is shown to the right. When both buttons are pressed. From Wikibooks, open books for datsaheet open world. This page was last edited on 16 Decemberat There are four AND gates in the chip, we can use one or all gates simultaneously. The description for each pin is given below. By using this site, you agree to the Terms of Use and Privacy Policy. If a is not available, there are several ways to achieve an AND gate.

After verifying the three states, you can tell that we have satisfied the above truth table.

At this time the total VCC appears across resistor R1. The pinout diagram, given on the right, is the standard two-input logic gate IC layout:. Views Read Edit View history.

74LS08 Pinout, Configuration, Equivalents, Circuit & Datasheet

In the circuit two transistors are connected in series to form a AND gate. The chip is basically used where AND logic operation is needed. A few mentioned below. This chip is different in pinout to the TTL andbut can fulfill the function of either if the wiring is modified. This is discussed on this page.


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 available in different packages and is chosen depending on requirement. Both transistors will be ON and voltage across both of them will be zero. For more information about the AND gate in general, see this module. It is really popular and is available everywhere.

The arrangement of the CMOS components is shown below:. These are available from manufacturers. Output of the AND gate is the voltage across resistor R1.

Because output is nothing but voltage across resistor R1 it will be LOW. When both buttons are not pressed.

Practical Electronics/IC/4081

For realizing the above truth table let us take a simple AND gate application circuit as shown below. In other languages Add links. This LED is connected to detect the state of output.

Submitted by admin on 6 April The first method with require two ICs to implement, but a total of four gates can be made.