IC 74LS164 PDF

Home > Integrated Circuits > 74 Series > 74LS Series. 74LS – 74LS 8-bit Serial Shift Register Datasheet – Buy 74LS Technical Information – Motorola . Buy low price, high quality ic 74ls with worldwide shipping on . These 8-bit shift registers feature gated serial inputs and an asynchronous clear. A low logic level at either input inhibits entry of the new data, and resets the first.

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74LS164 – 8-Bit Shift Register Ser In/Para Out

If you are wondering how to make an LED moving sign DIYthen probably you would like to refer to a few of the circuit designs already published here on Bright Hub. You can make it simply by using a transistor multivibrator circuit, or a light chaser circuit using the IC A more sophisticated design in the form of a scrolling display has also been recently discussed through one of my articles.

However the above circuits are either too basic and ordinary or too complex and difficult with their designs. Another similar IC 74LSwhose pin-out details was very recently discussed in one of my articles promises a more interesting configuration of a moving LED sign which will be surely appreciated by you.

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The circuit presented here using the above IC is able to produce a lighting pattern with the connected LEDs perfectly imitating a gradually forming word or a sentence.

IC 74LS – Cytron Technologies

74lss164 Although the circuit cannot produce the feel of a scrolling effect, never-the-less the gradual switching of the designated alphabets in succession can easily make an audience spell bound. As previously mentioned, the IC 74LS is an 8-bit synchronous shift register able to produce 8 serially incrementing logic high outputs in response to an applied clock signal. The circuit can be operated in two different modes, each producing two different restoration patterns immediately after all the outputs of the IC go high.

Referring to the above figure, we see that the serial inputs pin 1 and pin 2 of the IC are connected to the positive supply. 7l4s164 configuration inhibits its intended utility which will be discussed in the second mode of operation and renders it ineffective. When all the outputs go high, pin 13 also ultimately goes high and resets pin 9. Referring to the second diagram we find that the output of N2 has been replaced by the serial inputs of the IC while the reset input is permanently connected to the positive supply.

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IC 74LS164

Now interestingly, instead of shutting down all the LEDs suddenly, each one goes OFF one after the other serially, just as they had been lit, but now in the opposite way. Once the whole sequence extinguishes, the cycle repeats and we witness an alternating lighting sequence of the LEDs. The gate N1 along with R1 and C1 forms a simple clock generator and feeds the circuit with the required clock pulses for initiating the above explained patterns.

Powering the circuit would thus initiate the each character appearing one after another in sequence until the whole word or a number is formed — 74ld164 enchantingly. Introduction If you are wondering how to make an LED moving sign DIYthen probably you would like to refer to a few of the circuit designs already published here on Bright Hub.

The circuit is better understood the the following discussion.

Circuit Description As previously mentioned, the IC 74LS is an 8-bit synchronous shift register able to produce 8 serially incrementing logic high outputs in response to an applied clock signal.