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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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. Functional operation should be restricted to the Recommended Operating Conditions. Through a few of my previous articles I have tried to cover the working principles of a couple of versatile ICs like the and Setup Time, A1 or A2 to Clock.
Unlike ordinary CMOS ICs which has also been discussed in many of my previous articles datasjeet, the 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. 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.
All diodes are 1N or 1N A high level input enables the other input which will then determine the state of the first flip-flop. Search field Part name Part description.
Referring to the figure on the left we see that externally it looks just like an ordinary pin dual in-line chip. Similarly the IC requires only an external clock signal to make its outputs swing into action and produce interesting logic sequences.
Low Level Datasehet Voltage. High Level Input Voltage. Low Level Output Current. 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.
74LS – Integrated Circuits > 74 Series – Electronic Component
Hold Time, Clock to A1 or A2. Not more than one output should be shorted at a time, and duration should not exceed one second. Low Level Input Current.
All inputs are diode- clamped to datahseet transmission-line effects. High Level Output Current. Fully Buffered Clock and Serial Inputs.
74LS164 – 8-Bit Shift Register Ser In/Para Out
This 8-bit shift register features gated serial inputs and an. Introduction Through a few of my previous articles I have tried catasheet cover the working principles of a couple of versatile ICs like the and Output Short Circuit Current. Hopefully you will get to see another article pretty soon, which will explain the practical utility of this wonderful IC.
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. High Level Input Current. High Level Output Voltage. Low Level Input Voltage. Propagation Delay Time, Clock to Q. This opposite sequencing also takes place in accordance to the rising pulse of the input clocks.
Propagation Delay Time, Reset to Q. The serial inputs pin 1 and 2 of the IC datasyeet a special purpose of resetting the above procedure in an interesting pattern. 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.
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. Maximum Ratings are those values beyond 7l4s164 damage to the device may occur.