4-line to line Decoders/demultiplexers. Each or these 4-line-toline decoders utilizes TTL circuitry to decode four binary-coded inputs into one of. MOS technology. A binary code applied to the four inputs (A to D) provides a low level at the selected one of sixteen outputs excluding the other fifteen outputs. SNN .. of significant portions of TI information in TI data books or data sheets is permissible only if reproduction is without alteration.
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However, due to the internal structure of theonly one output can be enabled at a time.
Datasheet(PDF) – National Semiconductor (TI)
Y Performs the demultiplexing function by distributing data. You can upvote more than one answer.
And why are there 2 of them, you ask? The LED can be chosen at random by the status of the 4 line selector inputs. Y Input clamping diodes simplify system design.
My first question is more important Operating Free Air Temperature Range. This allows more flexibility in the logic functions available.
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 dataseet of all the NAND gates that produce the outputs.
All inputs are buffered and input clamping diodes are provided to minimize transmission-line effects and thereby simplify system design. The active-low enable inputs allow cascading of demultiplexers over many bits.
When either strobe input is high, all outputs are high. Electrical Characteristics over recommended operating free air temperature range unless otherwise noted. Low Level Input Datashest. The active-low output is just how the design for that specific decoder was carried out – there 74145 also active-high varieties.
Will someone please explain the purpose of inverting the outputs 0 through 15 as well as the use the NAND gates here?
National Semiconductor – datasheet pdf
Y Alternate Military Aerospace device is avail. I Datadheet Supply Current. Absolute Maximum Ratings Note. Please consider upvoting those questions you found useful like this one satasheet clicking the arrow pointing up near the answer vote count which is in turn above the checkbox you clicked to accept this question. That is, for an input ofthe 0 output is selected, and it is driven low.
View PDF for Mobile. Rather than providing only a single enable, both pins are used. The person who took time to answer the question will appreciate that.
Low to High Level Output. 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.
Low Level Output Current. Home Questions Tags Users Unanswered. First, the inversion of the outputs simply means that the output is active low. High to Low Level Output. If you wanted to generate a 1 of demultiplexer, you could use 16 s looking at the 4 least significant bits, while a single would look at the 4 most significant bits, with one ouput going to each of the other 16 s. Since the ouputs are active low, NAND gates do the job.
74154 Datasheet PDF
High Level Input Current. Each of the 16 outputs can be connected datashert a resistor and then through an LED to serve as a simple 16 LED controller. Sign up using Facebook. If you want to know exactly what is going on then draw out the truth table, but it is unlikely their function will make much sense to you. Y Decodes 4 binary-coded inputs into one of 16 mutually. For example, if the target application requires 16 7-segment LED displays, but your microcontroller datasyeet 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.
Post as a guest Name. Low Level Input Current.