Integrated Circuit. Transistor Transistor Logic (TTL). 4−Line−to−16−Line Decoder /Demultiplexer. 24−Lead DIP Type Package. Description: The NTE is a. 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 . datasheet, circuit, data sheet: NSC – 4-Line to Line for Electronic Components and Semiconductors, integrated circuits, diodes, triacs.
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Download the datasheet below for a more comprehensive summary.
Since the ouputs are active low, NAND gates do the job. 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.
You can upvote more than one answer. All inputs are buffered and input clamping diodes are provided to minimize transmission-line effects and thereby simplify system design. So you can use a 47 kilohm resistor to pull up drops 1. Please consider upvoting those questions you found useful like this one by clicking the arrow pointing up near the answer vote count which is in turn above the checkbox you clicked to accept this question.
However, due to the internal structure of theonly one output can be enabled at a time.
Home Questions Tags Users Datasheft. This is the image of a 1 to 16 demux. There are probably two enable inputs because otherwise dahasheet would be two unused pins on the 24 xatasheet package I don’t recall seeing 22 pin DIP packages. But when we try to implement a demultiplexer using a TTLthis is the truth table that is given in the book:.
(PDF) 74154 Datasheet download
Each of the 16 outputs can be connected through a resistor and then through an LED to serve as a simple 16 LED controller. Sign datsheet using Email and Password. Sign up using Email and Password. Post as a guest Name.
But when we try to implement a demultiplexer using a TTLthis is the truth table that is given in the book: Sign up using Facebook.
I have a doubt in the demultiplexer section.
It is counterintuitive yes, but datasueet is a well-established convention that the sort of devices that this part will be controlling will have active-low enable inputs. The LED can be chosen at random by the status of the 4 line selector inputs.
This allows more flexibility in the logic functions available. So is it possible that both enables are hooked to a 2-input OR gate; this is just making use of the extra pins to make 24? This chip is often used in demultiplexing applications, such as digital clocks, LED matrices, and other graphical outputs. As for the NAND gates, there is a function being implemented in which the gates are there to realize it. Why are the outputs inverted? All the other ouputs stay high.
Datasheet, PDF – Alldatasheet
Is the hardware implementation circuit different than the one explained in theory? That is, if the outputs were active high, OR gates would perform the synthesis desired. Inputs were pulled high by default, and only pulled low when necessary, to save power. Sign up or log in Sign up using Google.
Sign up using Facebook. The actual implementation of the chosen ic has active low outputs. Home Questions Tags Users Unanswered. These demultiplexers are ideally suited for implementing ratasheet memory decoders. Each or these 4-line-toline decoders utilizes TTL circuitry to decode four binary-coded inputs into one of sixteen mutually exclusive outputs when both the strobe inputs, G1 and G2, are low. The datasheet of these components is always the key to the correct implementation.