data can be entered, even while the outputs are off. Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 74LS SOP – NS. Tape and reel. SN74LSNSR. 74LS Tape and reel. 74LS datasheet, 74LS pdf, 74LS data sheet, datasheet, data sheet, pdf, Fairchild Semiconductor, 3-STATE Octal D-Type Transparent Latches and. The SN54/74LS consists of eight latches with 3-state outputs for bus organized system applications. The flip-flops appear transparent to the data.

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Results 1 to 20 of The led in the circuit is always Off. It doesnt latch in HIGH state. Can anyone please help me sort out the problem?. Datasheet of 74LS is also attached.

[SOLVED] Help with Latch IC 74LS based latching ciruit

Last edited by sharikbaig; 27th August at This means that while your Enable is active and in your circuit it is fo active – pin 11 high then the data presented to an input will always immediately get reflected to the output. As long as output is enabled which it is – datq 1 is Low For this latch to hold data, you must do the following: Enable gates pin 11 high 2.

Place data on input pin 3 – i. You have LE fixed High, hence output equals input Need to either set LE low to latch the input or choose different latch.

Originally Posted by kripacharya. 74le373 is an example http: The beauty of this simple circuit is it actually debounces your switch, i. Similar for other switch input. The only potential issue is both switches operating together as the output becomes indeterminate.


If you like I will draw the schematic for you. Last edited by KerimF; 27th August at Being not a machine, I always do silly mistakes or miss important things.

Therefore almost every post I write would usually be updated several times till it reaches its saturation: Also I may not reply at time. Our main server could be out of service anytime. Originally Posted by KerimF.

If you have CD, the remaining 2 gates can be used to combine the 2 switches in one. The initial state of the LED is off U3 output is low. The current I1, R7 and Q2 replace the 744ls373 switch in order to simulate the circuit.

I will get ic’s by day after tomorrow, will try your schematic and update you soon. Thanks also for reminder on LED driver, I had dropped down to logic states! You people are very helpful, Thanks. Any other idea is also welcomed.

Help with Latch IC 74LS based latching ciruit I actually made a similar project back in the 80’s when experimemting with programmable logic the good old days! Each momentary switch would latch a solenoid valve and when activated switch off the others valvesa bit like a manual washing machine.

This single chip solution plus solenoid drivers worked very well It could have been a useful touch switch which weren’t very common thenbut I learnt how to filter out, clamp and provide immunity instead! These small chips were 18 or 24 pins?


They were a great introduction to simple logic and hardware which is a bit lost in todays massive chips. Relay latching in AT89C51 based circuit Problem with 74LS latching! Compare latch based and register based design 5. Part and Inventory Search. AF modulator in Transmitter what is the A? What is the function of TR1 in this circuit 3. Losses in inductor of a boost converter 9. Turn on power triac – proposed circuit analysis 0. Choosing IC with EN signal 2.

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IC Datasheet: 74LS373 Data Sheet

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