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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Office Distributors for availability and specifications. First, the inversion of the outputs simply means that the output is active low. That is, for an input ofthe 0 output is selected, and it is driven low. High Level Input Dagasheet. I OS Short Circuit. The active-low enable inputs allow cascading of demultiplexers over many bits.
These demultiplexers are ideally suited for implementing high-performance memory decoders. Y Performs the datashest function by distributing data. Sign up using Facebook. Sign up using Email and Password. Rather than providing only a single enable, both pins are used.
Since the ouputs are active low, NAND gates do the job. Low Level Input Voltage. My first question is more important Datashert 3 I CC is measured with all outputs open and all inputs grounded.
This allows more flexibility in the logic functions available. Sign up or log in Sign up using Google.
Email Required, but never shown. The person who took time to answer the question will appreciate that. Each or these 4-line-toline decoders utilizes TTL circuitry to decode four binary-coded inputs into one of sixteen dataaheet exclusive outputs when both the strobe inputs, G1 and G2, are low.
Datasheet, PDF – Alldatasheet
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.
Download the datasheet below for a more comprehensive summary.
Low Level Input Current. All inputs are buffered and input clamping diodes are provided to minimize transmission-line effects and thereby simplify system design. You can upvote more than one answer.
High Level Output Current. Y Decodes 4 binary-coded inputs into one of 16 mutually. 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. Each or these 4-line-toline decoders utilizes TTL circuit.
V CC e Max. National Semiconductor Electronic Components Datasheet.
74154 Datasheet PDF
And why are there 2 of them, you ask? All the other ouputs stay high.
High to Dayasheet Level Output. If dxtasheet 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. WhatRoughBeast 49k 2 28 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.
Y Alternate Military Aerospace device is avail. Post as a guest Name. 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. Y Typical propagation delay. Each of the 16 outputs can be connected through a resistor and then through an LED to serve as a simple 16 LED controller.