Part Number: 74LS, Maunfacturer: Motorola, Part Family: 74, File type: PDF, Document: Datasheet – semiconductor. 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. It has 2N states where ‘N’ is the number of flip-flops. So here is how to make a Johnson counter using IC 74LS Here are some of the features of IC

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How Would You Build Moving LED Signs Using IC 74LS164? Pin-Outs Explored

The extreme top left pin from the printed side is the first pin in the order, and the pin just opposite to it on the other row is the last or the 14 th pin. High Level Input Voltage. Data at the serial inputs may be changed while the clock is high or low, but only information meeting the setup requirements will be entered clocking occurs or the low-to-high level transition of the clock input.

The serial inputs pin 1 and 2 of the IC has a special purpose of resetting the above procedure in an interesting pattern. High Level Output Voltage.

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

Fully Buffered Clock and Serial Inputs. Propagation Delay Time, Clock to Q. Maximum Ratings are those values beyond which damage to the device may occur. Low Level Input Voltage. This 8-bit shift register features gated serial inputs and an. Now suppose if through a simple wiring pins 1 and 2 are configured in such a way that when the last pin 13 of the IC goes high while sequencing serially, it grounds the serial input 1 and 2.


High Level Input Current. Hopefully you will get to see another article pretty soon, which will explain the practical utility of this wonderful IC.

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

High Level Output Current. The gated serial inputs A and B permit complete control over incoming data as a low at either or both input s inhibits entry of the new data and resets the first flip flop to the low level at the next clock pulse. The whole output array, instead of shutting down all together, now starts receding sequentially one-next-to-the-other, until all of them are shut down to begin the cycle all over again.

Similarly the IC requires only an 74ls16 clock signal to make its outputs swing into action and produce interesting logic sequences. Low Level Input Current.

A high level input enables the other input which will then determine the state of the first flip-flop. Introduction Through a few of my previous articles I have tried to cover the working principles of a couple of versatile ICs like the and Referring to the figure on the left we see that externally it looks just like an ordinary pin dual in-line chip. Propagation Delay Time, Reset to Q.

How Would You Build Moving LED Signs Using IC 74LS? Pin-Outs Explored

Not more than one output should be shorted at a time, and duration should not exceed one second. All inputs are diode- clamped to minimize transmission-line effects. Output Short Circuit Current. Unlike ordinary CMOS ICs which has also been discussed in many of my previous articlesthe above ICs are equipped with many different built-in features which may be accessed or activated by just applying the appropriate logic inputs or components to their relevant pin-outs.


Low Level Output Voltage. Hold Time, Clock to A1 or A2.

Search field Part name Part description. All diodes are 1N or 1N For example if the pin — outs 1 and 2 are permanently connected to the positive supply and the reset pin is joined to the last output of the IC pin 13then, as discussed earlier, once all the outputs become high the last pin 13 instantly resets the whole circuit, shutting the whole array of outputs, and the cycle repeats.

74lz164 Time, A1 or A2 to Clock. Low Level Output Current.

Through a few of my previous articles I have tried to cover the working principles of a couple of versatile ICs like the and Functional operation should be restricted to the Recommended Operating Conditions. 74la164 opposite sequencing also takes place in accordance to the rising pulse of the input clocks.