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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It is counterintuitive yes, but it is a well-established convention that the sort of devices that this part will be controlling will have active-low enable inputs.

I understand how it works. Understand, this is a typical example of application, not it’s sole purpose. 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. For the proper working of this local control section except the local telephone set it needs a permanent back up which gives a 5V back up continuously.

This period is calculated by the formula.

Device Control Using Telephone:

By pressing any key in the keyboard corresponding DTMF signal is available in its output pin at pin no. When either strobe input is high, all outputs are high. The whole local control section except local telephone set is assembled in a single board, which is available in the market as common PCB.


This signal is sent to the local control system through telephone line via daasheet.

Email Required, but never shown. This all has to do with the actual ic design. The internal clock circuit is completed with the addition of a standard 3. A Typical frequency is shown in the figure below: You can control up to 10 devices.

With an astable operation, the frequency and pulse width are produced by two external resistors and one capacitor connected between Vcc-Discharge RDischarge-Threshold Rand Threshold-Ground C. Here I am using a telephone as a media, which serves main part of this system, by using home phone as a local phone and another phone, either landline or mobile phone as a remote phone.

Here this circuit is designed for a period of 60 seconds. The demultiplexing function is performed by using the 4 input lines to address the output line, passing data from one of the strobe inputs with the other strobe input low.

(PDF) 74154 Datasheet download

If the device is already in datsheet ON state, then we will here a beep sound. If device is in OFF state then no beep will be heard.

Until you press the key the feedback tone is heard. The frequencies are chosen such that they are not the harmonics of each other.


By using this IC we can construct two types of multivibrater, monostable and astable. So TTL circuitry adopted asymmetric logic levels, where ‘0’ was guaranteed to be below 0.

The LED can be chosen at random by the status of the 4 line selector inputs. Here it is wired as dataasheet astable multivibrater with a few external components like resister and capacitor are required along with the timer chip set.

Datasheet, PDF – Alldatasheet

After dafasheet period of 5 seconds the output of the IC 6 goes low and puts the tri state buffer in the high impedance state. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. If the device is already switched ON then you will hear adtasheet short duration beep tone from beep tone generator unit.

I like to share some of those here. It inhibits the detection of Hz.

Here this D flip flop is used in the toggle mode. I have a doubt in the demultiplexer section. Now make a call to your telephone set using a remote telephone set or mobile phone.