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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Similarly the IC requires only datasheft external clock signal to make its outputs swing into action and produce interesting logic sequences. Maximum Ratings are those values beyond which damage to the device may occur. Propagation Delay Time, Clock to Q.

74LS (SLS) – 8-bit Serial-input/parallel-output Shift Register | eet

Low Level Output Voltage. A high level input enables the other input which will then determine the state of the first flip-flop. All diodes if 1N or 1N Through a few of my previous articles I have tried to cover the working principles of a couple of versatile ICs like the and 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.

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. 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.


This 8-bit shift register features gated serial inputs and an. Low Level Input Voltage. Output Short Circuit Current.

Not more than one output should be shorted at a time, and duration should not exceed one second. Dataxheet field Part name Part description.

Functional operation should be restricted to the Recommended Operating Conditions. Referring to the figure on the left we see that externally it looks just like an ordinary pin dual in-line chip.

All inputs are diode- clamped to minimize transmission-line effects. 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, datashest all the outputs become high the last pin 13 instantly resets the whole circuit, shutting the whole array of outputs, and the cycle repeats.

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 74l164 inhibits entry of the new data and resets the first flip flop to the low level at the next clock pulse.


Propagation Delay Time, Reset to Q. Setup Time, A1 or A2 to Clock. Fully Buffered Clock and Serial Inputs.

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

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 Output Voltage. Hopefully you will get to see another article pretty soon, which will explain the practical utility of this wonderful IC.

This opposite darasheet also takes place in accordance to the rising pulse of the input clocks. Hold Time, Clock to A1 or A2. 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 Low Level Output Current. 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 Input Voltage. 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. Low Level Input Current. High Level Input Current.