74138 DECODER PDF

74LS is a member from ’74xx’family of TTL logic gates. The chip is designed for decoding or de-multiplexing applications and comes with 3. The 74LS is a high speed 1-of-8 Decoder/Demultiplexer. This device is ideally suited for high speed bipolar memory chip select address decoding. The. The 74LS is a 3-to-8 Decoder/Demultiplexer designed to be used in high- performance memory decoding or data-routing applications requiring very short.

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Description Resources Learn Videos Blog 74ls Schottky-clamped TTL MSI circuits are designed to be used in high-performance memory decoding or data-routing applications requiring very short propagation delay times.

The three buttons here represent three input lines for the device.

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The 74lS decode one of eight lines dependent on the conditions at the three binary select inputs and the three enable inputs. The three enable pins of chip decodr which Two active-low and one active-high reduce the need for external gates or inverters when expanding.

This way we can realize all the truth table by toggling the three buttons B1, B2 and B3 Three inputs A0, A1 and A2 and with that we have three input to eight output decoder. Also the chip inputs are clamped with high-performance Schottky diodes to suppress line-ringing and simplify system design.

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Features and Electrical characteristics of 74LS Decoder Designed specifically for decoser speed Incorporates three enable pins to simplify cascading De-multiplexing capability Schottky clamped for high performance ESD protection Balanced propagation delays Inputs accept voltages higher than VCC Supply voltage: A line decoder can be implemented without external inverters and a line decoder requires only one inverter.

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For understanding the working of device let us construct a simple application circuit with a decodee external components as shown below.

This means that the effective system delay introduced by the decoder is negligible to affect the performance. In high-performance memory systems, these decoders can be used to minimize the effects of system decoding. Decooder enables the use of current limiting resistors to interface inputs to voltages in excess of V CC. Product successfully added to your wishlist! The LM is a quadruple, independent, high-gain, internally compensated operational amplifiers designed to have operating characteristics similar to the LM How to use 74LS Dfcoder For understanding the working of device let us construct a simple application circuit with a few external components as shown below.

This amplifier exhibit low supply-current drain decodef input bias and offset currents that is much less than that of the LM The memory unit data exchange rate determines the performance of any application and the delays of any kind are not tolerable there.

In such applications using 74LS line decoder is ideal because the delay times of this device are less than the typical access time of the memory. Features 74ls features include; Designed Specifically for High-Speed: Choose an option 20 28 Here the dedoder are connected to LED to show which output pin goes LOW and do remember the outputs of the device are inverted. This means that the effective system delay introduced by the Schottky-clamped system decoder is negligible.

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Choose an option 3. TL — Programmable Reference Voltage.

Submitted by admin on 26 October Add to cart Learn More. An enable input can be used as a data input for demultiplexing applications.

– 3-to-8 line decoder/demultiplexer; inverting – ChipDB

All inputs are clamped deckder high-performance Schottky diodes to suppress line-ringing and to simplify system design. Standard frequency crystals — use these crystals to provide a clock input to your microprocessor.

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74LS138, 3-to-8 Decoder / Demultiplexer – 74138

The chip is designed for decoding or de-multiplexing applications and comes with 3 inputs to 8 output setup. For understanding the working eecoder us consider the truth table of the device.

Drivers Motors Relay Servos Arduino. This device is ideally suited for high speed bipolar memory chip select address decoding. It features fully buffered inputs, each of which represents only one normalized load to its driving circuit. Decocer active-low and one active-high enable inputs reduce the need for external gates or inverters when expanding. As shown in table first three rows the enable pins needed to be connected appropriately or irrespective of input lines all outputs will be high.