DATASHEET 74154 PDF

You can upvote more than one answer. Since the ouputs are active low, NAND gates do the job. Sign up using Email and Password. According to the internal logic diagram on the datasheet, the G inputs are connected to a two-input AND gate with inverting inputs, whose output feeds one input of all the NAND gates that produce the outputs.

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Arashinos 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. 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. 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. 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. 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.

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. 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.

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High to Low Level Output. Each or these 4-line-toline decoders utilizes TTL circuit. High Level Output Current. V CC e Max. Post as a guest Name. First, the inversion of the outputs simply means that the output is active low.

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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. Sign up using Email and Password. This carried through to the input current requirements: Sign up using Facebook. Is the hardware implementation circuit different than the one explained in theory? This all has to do with the actual ic design. Inputs datasheet pulled high by default, and only pulled low when necessary, to save power. Why is the output in the truth table inverted in a ic used as a demux?

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