1) CPD is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without load. (Refer to Test . Integrated Circuit. Transistor Transistor Logic (TTL). 4−Line−to−16−Line Decoder /Demultiplexer. 24−Lead DIP Type Package. Description: The NTE is a. datasheet, circuit, data sheet: NSC – 4-Line to Line Decoders/Demultiplexers,alldatasheet, datasheet, Datasheet search site for.

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4 Line to 16 Line Demultiplexer / Decoder

High on the pin 3 of this timer IC biases the transistor T2 in the relay driver circuit 7414 in tern switches ON the relay.

Here this circuit is designed for a period of 60 seconds. If device is in OFF state then no beep will be heard. It is active low output IC so when any output line is selected it is indicated by active low signal, rest of the output lines will remain active high.

If we are not sure about its status and if we false switch the appliance, then this will lead to some problems like damaging the device. This circuit gives an acknowledgement tone after switching 7154 the devices to confirm the status of the device.

IC BCD – seven segment decoder. Here this system works on tone dialing mode. For example, if the target application requires 16 7-segment LED displays, but your microcontroller only has 4 lines to select which display is active, this chip 74LS would provide a very effective method of essentially multiplying you selecting lines by a 4 times. The working of all the above IC’s are mentioned here before.


Here common anode seven segment display is used. If the device is already in the ON state, then we will here a beep sound.

(PDF) 74154 Datasheet download

This IC is a tri state buffer contains four independent datasheett each of which performs a non-inverting buffer function. This IC inverts the data on its input terminal and 47154 inverted output. These demultiplexer are ideally suited for implementing high-performance memory decoders. This output is fed to the line decoder IC This IC is used as a multivibrater click here to download datasheet.

These tones are used for communication signaling. By pressing any key in the keyboard corresponding DTMF signal is available in its output pin at pin no. Email Required, but never shown. By this the device is switches ON.

The DTMF mode is shortly called as tone dialing mode. Daasheet mode is enabled by a logic high input to pin 5 INH. A seven segment display has seven LEDs connected in a sequence to give a regular if and a LED to display the dot for decimal point. When you press the digit 5 in the keypad it generates a resultant tone signal which is made up of frequencies Hz and Hz. Then respective LED glows. Now make a call to your telephone set using a remote telephone set or mobile phone.


This is the image of a 1 to 16 demux.

Repeat the above step i once again. This chip is often used in demultiplexing applications, such as digital clocks, LED matrices, and other graphical outputs. Local control section contains a telephone interface circuit, ring detector circuit, signal decoder circuit, device status check circuit, device controlling circuit, device status feedback circuit.

Working of the monostable multivibrater datashet discussed. The output of tri state buffer is latched by using a D flip-flop.

National Semiconductor

These signals are digital signals which are symmetrical with the sinusoidal wave. Indicating that the device is switched OFF. By using this system we can control the light from a control room or by the cell phone of the marketing person. The output of the D flip-flop is applied to the base of the transistor T5 — T15 via a resister. I off a doubt in the demultiplexer section.