SYNCHRONOUS UP/DOWN COUNTERS WITH DOWN/UP MODE CONTROL. SDLS – DECEMBER – REVISED MARCH 3. POST OFFICE BOX . datasheet, pdf, data sheet, datasheet, data sheet, pdf, Fairchild Semiconductor, Synchronous 4-Bit Up/Down Counter with Mode Control. Category. Description, Synchronous 4-bit Up/down Counter with Mode Control. Company, Fairchild Semiconductor. Datasheet, Download datasheet.

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Not more than one output should be shorted at a time. BTW, most counters are sequential, which means a 3 count would be something like Mar 24, 21, 2, You can put any binary number on the load inputs. Jul 26, 2, Yes, my password is: Personally I prefer thewhich is very similar in many ways.

Low Level Input Voltage. Look at post 7, I posted a pinout I made as part of my PaintCAD package used for quick and dirty drawing of schematics. The outputs of the four master-slave flip-flops are triggered on a low-to-high transition of the clock input if the enable input is low. How does this security protocol differ from SSL?

I think I have maybe I’ll try take a look and understand the datasheet first A HIGH at the enable input inhibits counting. Level changes at the enable input should be made only when the clock input is high. The clock down up and load inputs are buffered to lower the drive requirement which significantly reduces the num- ber of clock drivers etc required for long parallel words.


When the count 11 the chip is cleared. Do you already have an account? These counters are fully programmable; that is, the outputs may be preset to either level by placing a low on the load input and entering the desired data at the data inputs.

74191 Datasheet PDF

The counters can be. You could use much simpler chips, such as dual flip flops. BTW, this is a standard question, one countrr don’t have to answer. The output will change to agree with the data inputs independently of the level of the clock input.

Quote of the day. Operating Free Air Temperature Range. No, create an account now. Free Air Operating Temperature. The counter is fully programmable; that is, the outputs may.

I’m so sorry I’m a bit slow. Two outputs have datasheeg made available to perform the cas- cading function ripple clock and maximum minimum count The latter output produces a high-level output pulse with a duration approximately equal to one complete cycle of the clock when the counter overflows or underflows The ripple clock output produces a low-level output pulse equal in width to the low-level portion of the clock input when an overflow or underflow condition exists The counters can be easily cascaded by feeding the ripple clock output to the enable input of the succeeding counter if parallel clocking is used or to the clock input if parallel enabling is used The maximum minimum count output can be used to accom- plish look-ahead for high-speed operation.


Oct 8, 6. The problem I see with using a is simple, no reset pin. This feature allows datadheet counters to be used as modulo-N dividers by simply modifying the count length with the preset inputs.

how counter works? | All About Circuits

While I don’t have the schematic handy, two JK flip flops will do the count directly wired appropriately, while the reset method will have a dafasheet number that changes very fast.

C National Semiconductor Corporation. Data Setup Time Note 4.

Here is the datasheetwhich should always be your starting point. The ripple clock 741991 produces a low-level output pulse equal in width to the low-level portion of the clock input when an overflow or underflow condition exists.

Dec 5, 5, Look at internal schematics of the and for example. Your name or email address: I have read the datasheet, but I still don’t quite understand how it works.

The outputs of the four master-slave flip-flops are triggered. I’m spoiled, I have cultivated a really deep stock of parts so I can write articles and wire stuff on whim. Typical Load Count and Inhibit Sequences. Oct 8, 1.