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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That is, if the outputs were active high, OR gates would perform the synthesis desired. Free Air Operating Temperature. 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. Low Level Input Current.
High Level Output Current. Operating Free Air Temperature Range. Sign up using Email and Password. Y Input clamping diodes simplify system design. National Semiconductor Electronic Components Datasheet. I OS Short Circuit. Since the ouputs are active low, NAND gates do the job. The person who took time to answer the question will appreciate that.
Low Level Output Current. Office Distributors for availability and specifications.
Datasehet Level Input Voltage. Rather than providing only a single enable, both pins are used. Note 3 I CC is measured with all outputs open and all inputs grounded. I am a new user so I didn’t know I had that power.
National Semiconductor – datasheet pdf
Datasheet pdf – 4-Line to Line Decoders/Demultiplexers – National Semiconductor
High Level Input Current. I CC Supply Current. High to Low Level Output. Sign up using Facebook. Post as a guest Name. All the other ouputs stay high. The active-low enable inputs allow cascading of demultiplexers over many bits.
Y Performs the demultiplexing function by distributing data. Note 2 Not more than one output should be shorted at a time. There are probably two enable inputs because otherwise there would be two unused pins on the ddatasheet pin package I don’t recall seeing 22 pin DIP packages. 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. And why are there 2 of them, you ask? Y Typical propagation delay.
The demultiplexing function is performed by using the 4 input lines 7454 address the output line, passing datasheeg from one of the strobe inputs with the other strobe input low. Y Alternate Military Aerospace device is avail. The active-low output is just how the design for that specific decoder was carried out – there is also active-high varieties.
74154 Datasheet PDF
The LED can be chosen at random by the status of the 4 line selector inputs. Absolute Maximum Ratings Note. Many TTL parts and older memory chips have active low enable inputs, so the active low outputs of this part can be connected directly to those inputs. Y High fan-out low-impedance totem-pole datashset.
However, due to the internal structure of theonly one output can be enabled at a time. This chip is often used in demultiplexing applications, such as digital clocks, LED matrices, and other graphical outputs. Sign up or log in Sign up using Google. Download the datasheet below for a more comprehensive summary. V CC e Max. If Military Aerospace specified devices are required. WhatRoughBeast 49k 2 28 As for the NAND gates, there is a function being implemented in which the gates are there to realize it.
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.