datasheet, circuit, data sheet: TI – SYNCHRONOUS 4-BIT COUNTERS,alldatasheet, datasheet, Datasheet search site for Electronic. These synchronous, presettable counters feature an inter- nal carry look-ahead for application in high-speed counting designs. The DM74LSA and. 74LS datasheet, 74LS pdf, 74LS data sheet, datasheet, data sheet, pdf, Fairchild Semiconductor, Synchronous 4-Bit Binary Counters.

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Message 1 of Message 3 of In my search for understanding more I discovered a recent document that had identified an error in the multisim model related to the counter executing on falling edge of clock, should be rising edge. The case is not solved – and I have now asked dataeheet moderator to remove the duplicate.

4-bit Synchronous Counter with Asynchronous Clear

Message 5 of I appreciate any insights. Message 9 of I am especially looking for information concerning the “old 70s design” you want to datasheett.

Message 6 of I am building a simulation of an old 70s design based on s and I have had a lot of trouble getting a set of counters to operate according to my expectations.


Thanks in advance for your feedback! Is the model that is being used datahseet there shareable?

Unfortunately it did not solve my headache. Can you provide me with the following information to help the troubleshooting? Most Active Software Boards: Message 7 of I am new to NI tools and new to the forums.

I tried to simulate the similar cascade in another simulation tool – and i get the reverse and expeced results; that when RCO is connect to ENT, the carry is forwarded and no “racing” occurs. In the schematics the rco is connected to ENT. But, when the second counter’s RCO carries over to the third counters ENT it stays high for a long period of time the duration of the QA and sets off the third counter to “race at clock speed” similar to the first counter.

74LS Datasheet(PDF) – Motorola, Inc

For some reason i couldnt attach files with my message above, and i cannot post them separately either it appears When connected to ENT as darasheet appears to be done in the orignal schematics p21, B4 to E4 the third counter starts to race at clock speed when RCO set ENT high as can be seen in the attached simulation screen shot. Message 10 of They should form a simple 16 bit binary counter that keeps incrementing until all of the output bits for E4 are all zeros and then it loads all the counters with preset value.


Message 2 of I am asking because I found another post in this board that noted that the issue was resolved. Message 4 of Message 8 of Please find attached the multisim model.

Fairchild Semiconductor

Something wrong with the model? This is not the case when connecting to ENP.

Question to the forum: Do you have any information about the simulation tool you are comparing to? Thanks for sharing these files over here! Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.