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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In the circuit two transistors are connected in series to form a AND gate. When both buttons are not pressed.

HEF Datasheet, PDF – Alldatasheet

From Wikibooks, open books for an open world. The pinout diagram, given on the right, is the standard two-input logic gate IC layout:. Both transistors satasheet be ON and voltage across both of them will be zero. Policies and guidelines Contact us. The chip is basically used where AND logic operation is needed. By using this site, you agree to the Terms of Use and Privacy Policy. 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. Because of this the chip can be used for high speed AND operations.


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

If a is not available, there are several ways to achieve an AND gate. TL — Programmable Reference Voltage. When any one of the buttons is pressed. The chip provides TTL outputs which are needed in some systems. It is really popular and is available everywhere.

Views Read Edit View history. These are available from manufacturers. There are four AND gates in the chip, we can use one or all gates simultaneously. Retrieved from ” https: Because output is nothing but voltage across resistor R1 it will be LOW. This is discussed on this page. 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. Because total VCC appears across transistors the drop across resistor R1 will be zero.

These two inputs are connected to buttons to change the logic of inputs. With that the drop across resistor R1 will be zero.

The circuit working can be explained in few stages below: This chip is different in pinout to the TTL andbut can fulfill the function of either if the wiring is modified. The first method with require two ICs to implement, but a total of four gates can be made. In other languages Add links. This page was last edited on 16 Decemberat For more information about the AND gate in general, see this module. The arrangement of the CMOS components is shown below:.


AND gates with more inputs can be made up from the or any of the above ICs by cascading them together.

Practical Electronics/IC/4081

For better understanding the internal working let us consider the simplified internal circuit of AND gate as shown below. Output of the AND gate is the voltage across resistor R1. At this time the total VCC appears across resistor R1. Submitted by admin on 6 April The second will require only one IC, but only two gates can be made.

The first is to use a NAND gate and invert the output. This LED is connected to detect the state of output.

The chip is available in different packages and is chosen depending datzsheet requirement. The description for each pin is given below. The chip is used in systems where high speed AND operation is needed. In this state the current flow through base of both transistors will be zero. A selection of different manufacturers’ datasheets is given below:. When both buttons are pressed.