74191 COUNTER DATASHEET PDF

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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Low to High Level Output. Here is the datasheetwhich should always be your starting point. Think pin 14 clear. When LOW, the counter counts up. Synchronous operation is provided by hav- ing all flip-flops clocked simultaneously, so that the outputs change simultaneously when so instructed by the steering logic.

It does help us refer sources and parts. Order Number Package Number. Oct 8, 6. A simple combination of inverters and a 4 input AND gate will detect any number, including a 3 count, you need.

This counter is 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 The output will change independent of the level of the clock input This feature allows the counters to be used as modulo-N dividers by simply modifying the count length with the preset inputs.

If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications. There is no reset pin, which means you need to load into the presets pins 15, 1, 10, 9 and toggle load.

I have read the datasheet, but I still don’t quite understand how it works. Perhaps you could show us the count sequence you are after? For example, see Project: Asynchronously presettable with load control.

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Data Setup Time Note 4. When low, the counter count up and when high, it counts down.

Datasheet(PDF) – National Semiconductor (TI)

A HIGH at the enable input inhibits counting. Oct 8, 9. 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. BTW, this is a standard question, datashheet you don’t have to answer.

74191 Datasheet PDF

C National Semiconductor Corporation. Free Air Operating Temperature. 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. This feature allows the counters to be used as modulo-N dividers by simply modifying the count length with the preset inputs.

Cascadable for n-bit applications. Two outputs have been 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.

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Low Level Input Voltage. They are used for old style digital clocks time pieces. This mode of operation eliminates the output count.

High Level Input Voltage. A high at the enable input inhibits counting. Personally I prefer thewhich is very similar in many ways.

You’ll note most of the old hands have it in their profile, this is why. Devices also available in Tape and Reel. I still don’t get the part to terminate the count after three clock cycles period.

When the count 11 the chip is cleared. Level changes at the enable input should be made only when the clock input is high. The counters can be easily cascaded by feeding the ripple clock output dataaheet the enable input of the succeeding counter if parallel clocking is used, or to the clock input if parallel enabling is used.

Oct 9, Load Release Time Note 4.

This mode of operation eliminates the output counting spikes normally associated with asynchronous ripple clock counters. The outputs of the four master-slave flip-flops are triggered. Do you already have an account? Clock Frequency Note 4. Single down up count control line.

Level changes at either the enable input or the. Synchronous operation is provided by hav. Hold Time Note 4. 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.

Dec 5, 5,