DATASHEET 74154 PDF

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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4 to 16 decoder logic diagram – Electrical Engineering Stack Exchange

As for the NAND gates, there is a function being implemented in which the gates are there to realize it. 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. 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.

Low Level Input Voltage. High to Low Level Output. All inputs are buffered and input clamping diodes are provided to dafasheet transmission-line effects and thereby simplify system design.

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First, the inversion of the outputs simply means that the output is active 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.

This allows more flexibility in the logic functions available. High Level Input Voltage. View PDF for Mobile. Sign up using Email and Password.

Download the datasheet below for a more comprehensive summary. All the other ouputs stay high. Y Typical power dissipation mW. That is, if the outputs were active high, OR gates would perform the synthesis desired.

Office Distributors for availability and specifications. I am a new user so I didn’t know I had that power. Many TTL parts and older memory chips have active low enable dataheet, so the active low outputs of this part can be connected directly to those inputs. The active-low output is just how the design for that specific decoder was carried out – there is also active-high varieties. You can upvote more than one answer. Each or these 4-line-toline decoders utilizes TTL circuit. Y Input clamping diodes simplify system design.

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When either strobe input is high, all outputs are high. 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. 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.

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National Semiconductor

Y Performs the demultiplexing function by distributing data. Y Typical propagation delay. Absolute Maximum Ratings Note. Y High fan-out low-impedance totem-pole outputs. Email Required, but never shown. 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 datsheet lines by a 4 times.

Rather than providing only a single enable, both pins are used. Home Questions Tags Users Unanswered. I OS Short Circuit.

Since the ouputs are active low, NAND gates do the job. Note 2 Not more than one output should be shorted at a time.