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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This chip is often used in demultiplexing applications, such as digital clocks, LED matrices, and other graphical outputs. High to Low Level Output. Y Decodes 4 binary-coded inputs into one of 16 mutually. If Military Aerospace specified devices are required. The LED can be chosen at random by the status of the 4 line selector inputs.
Y Typical propagation delay.
Electrical Characteristics over recommended operating free air temperature range unless otherwise noted. These demultiplexers are ideally suited for implementing high-performance memory decoders. The active-low enable inputs allow cascading of demultiplexers over many bits.
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.
High Level Output Current. I OS Short Circuit. View PDF for Mobile. Note 2 Not more than one output should be shorted at a time. Office Distributors for availability and specifications.
Will someone please explain the purpose of inverting the outputs 0 through 15 as well as the use the NAND gates here? National Semiconductor Electronic Components Datasheet.
Note 3 I CC is measured with all outputs open and all inputs grounded. The person who took time to answer the question will appreciate that.
Datasheet PDF –
Y Input clamping diodes simplify system design. V CC e Max.
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. So is it possible that both enables are dataxheet to a 2-input OR gate; this is just making use of the extra pins to make 24? Download the datasheet below for a more comprehensive summary.
That is, if the datashheet were active high, OR gates would perform the synthesis desired. 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. 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.
Y Performs the demultiplexing function by distributing data. First, the inversion of the outputs simply means that the output 74514 active low.
Datasheet, PDF – Alldatasheet
High Level Input Current. 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. Low Level Input Voltage.
Absolute Maximum Ratings Note.