3 8 decoder 74ls138 pdf

This means that the effective system delay introduced by the schottkyclamped system decoder is negligible. The chip is designed for decoding or demultiplexing applications and comes with 3. Datasheet search engine for electronic components and semiconductors. Aug 18, 2019 74ls8, 3to8 decoder demultiplexer 748 this means that the effective system delay introduced by the schottkyclamped system decoder is negligible. The lsttlmsi sn5474ls8 is a high speed 1of8 decoderdemultiplexer. The device features three enable inputs e1 and e2 and e3. In highperformance memory systems these decoders can be used to minimize the effects of system decoding. The design is also made for the chip to be used in highperformance memorydecoding or datarouting applications, requiring very short propagation delay times. Designing of 3line to 8line decoder and demultiplexer.

The design is also made for the chip to be used in highperformance memorydecoding or datarouting applications, requiring very short propagation delay ti. Two types of decoders commonly used in m68k systems are 74ls8 3 to 8 decoder from mct 3235 at international islamic university malaysia. Designing of 3 to 8 line decoder and demultiplexer using ic. The748 is a commercially available msi 3 to 8 decoder. Oct 25, 2018 the lsttlmsi sn74ls8 is a high speed 1of 8 decoder demultiplexer. The setup of this ic is accessible with 3inputs to 8output setup. Designing of 3 to 8 line decoder and demultiplexer using. In the figure below 748 gets selected when the addresses a 15 a 14 a turns to 0. The multiple input enables allow parallel expansion to a 1of24 decoder using just three ls8 devices or to a 1of32 decoder using four ls8s and one inverter. Any pointers on where to go from here are appreciated.

Unit min max tplh tphl propagation delay an to qn waveform 1, 2 3. September 19933philips semiconductorsproduct speci. The decoders outputs can drive 10 low power schottky ttl equivalent loads, and are functionally and pin equivalent to the 74ls8. Check with the manufacturers datasheet for uptodate information. How can i design a 4to16 decoder using two 3to8 decoders. Dm74als8 3 to 8 line decoderdemultiplexer physical dimensions inches millimeters unless otherwise noted continued 16lead plastic dualinline package pdip, jedec ms001, 0. Gate cmos the mc74hc238a is identical in pinout to the ls238. This device is ideally suited for high speed bipolar memory chip select address decoding. Data is maintained by an independent source and accuracy is not guaranteed. Logic diagram ordering information device package shipping. Retired 74ls8 ic, 3 to 8 decoderdemultiplexer, dil. Mm74hc8 3to8 line decoder virginia military institute. Mm74hc8 3to8 line decoder life support policy fairchilds products are not authorized for use as critical components in life support devices or systems without the express written approval of the president of fairchild semiconductor corporation. In highperformance memory systems these decoders can.

We use the logic of selection to generate signals for chip selection tending to eight chips in a microcomputer system. The ls8, sn54s8, and sn74s8a decode one of eight lines dependent on the conditions at the three binary select inputs and the three enable inputs. Since i am using two 3 8 decoders to develop a 4to16 decoder, i want to use 4 inputs out of the two 3 8 decoders. The absolute maximum ratings are those values beyond whichthe safety of the device cannot be guaranteed. This ic is mainly used in applications like memory decoding with high. High impedance ttl compatible inputs significantly reduce current loading to input drivers while ttl compatible outputs offer improved switching noise. Arduino forum using arduino general electronics 74ls8 3 to 8 line decoder. The lsttlmsi sn5474ls8 is a high speed 1of8 decoder demultiplexer. The multiple input enables allow parallel ex pansion to a 1of24 decoder using just three ls8 devices or to a 1of32 decoder using four ls8s and one inverter. Fairchild semiconductor 74ls8 decoderdemultiplexer. The multiple input enables allow parallel expansion to a 1of24 decoder using just three f8 devices or a 1of32 decoder using four f8.

Gowthami swarna, tutorials point india private limited. The lsttlmsi sn5474ls8 is a high speed 1of8 decoder. In highperformance memory systems these decoders can be used to minimize effects of system decoding. Dm74ls154 4line to 16line decoderdemultiplexer dm74ls154 4line to 16line decoderdemultiplexer general description each of these 4lineto16line decoders utilizes ttl circuitry to decode four binarycoded inputs into one of sixteen mutually exclusive outputs when both the strobe inputs, g1 and g2, are low. It takes 3 binary inputs and activates one of the eight outputs. Jan 25, 2015 748 decoder ic 3 to 8 decoder pin diagram 748 working of 748 why 748 have 3 enable pin duration. The sn74ls8n is a 3 line to 8 line decoder demultiplexer, schottkyclamped ttl msi circuit is designed to be used in highperformance memory decoding or datarouting applications requiring very short propagation delay times. Since i am using two 38 decoders to develop a 4to16 decoder, i want to use 4 inputs out of the two 38 decoders.

Two active low and one active high enables g1, g2a and g2b are provided to ease the cascading decoders. The circuit is designed with and and nand logic gates. The lsttlmsi sn54 74ls8 is a high speed 1of 8 decoder demultiplexer. Life support devices or systems are devices or systems. A decoder circuit takes multiple inputs and gives multiple outputs. The device has two independent decoders, each of which accept two binary weighted inputs a0, a1 and provide four mutually exclusive active low outputs o0o3. In highperformance memory systems, this decoder can be used to minimize the effects of system decoding. The device inputs are compatible with standard cmos outputs. A decoder is a combinational logic circuit which is used to change the code into a set of signals. The device features three enable inputs e1, e2 and e3. The setup of this ic is accessible with 3 inputs to. The chip is designed for decoding or demultiplexing applications and comes with 3 inputs to 8 output setup. Dm74ls9 decoderdemultiplexer 74ls8 74ls8smd 74ls9 decoderdemultiplexer general description these schottkyclamped circuits are designed to be used in highperformance memorydecoding or datarouting applications, requiring very short propagation delay times.

Data transmission systems s dm74ls8 3to8line decoders incorporates 3 enable inputs to simplify cascading andor data reception. The ls8, sn54s8, and sn74s8a decode one of eight lines dependent on the conditions at the three binary select inputs and. I want to drive a three speed fan which has a simple switched selector converted to ssrs. This decoder circuit gives 8 logic outputs for 3 inputs and has a enable pin. If the device is enabled these inputs determine which one of the eight normally high outputs will go low. These schottkyclamped circuits are designed to be used. The ls8, sn5458, and sn7458a decode one of eight lines dependent on the conditions at the three binary select inputs and the three enable inputs. Symbolname and function datasheet search, datasheets, datasheet search site for electronic components and semiconductors, integrated circuits, diodes and other semiconductors. The lsttlmsi sn74ls8 is a high speed 1of8 decoderdemultiplexer. Minterm with normal complemented variables is taken as 0 and. This device is ideally suited for highspeed bipolar memory chip select address decoding.

Every output will be low unless e1 and e2 are low and. Feb 28, 2019 we use the logic of selection to generate signals for chip selection tending to eight chips in a microcomputer system. The ic 74ls8 is a 3 to 8 line decoder integrated circuit from the 74xx family of transistortransistorlogicgates. Two types of decoders commonly used in m68k systems are. At the entrance receives a 3bit number which multiplexes on an 8bit number the 7segment display. This product is retired and we wont sell it anymore. The main function of this ic is to decode otherwise demultiplex the applications. The parametric values defined in the electricalcharacteristics tables are not guaranteed at the absolute maximum ratings.

The sn74ls8n is a 3line to 8line decoderdemultiplexer, schottkyclamped ttl msi circuit is designed to be used in highperformance memory decoding or datarouting applications requiring very short propagation delay times. So ill use all three of the first and the first of the second, and connect the last two inputs to ground, since they wont be used. Tolerant inputs the mc74lcx8 is a high performance, 3. All inputs are protected from damage due to static discharge by diodes to vcc and ground. Jun 22, 2019 74ls, 74ls datasheet, 74ls pdf, buy 74ls, 74ls 3 to 8 decoder. Jan 26, 2018 3 to 8 decoder design watch more videos at lecture by.