The DM74LS circuit is a synchronous, reversible, up/ down counter. Synchronous operation is provided by hav- ing all flip-flops clocked simultaneously. Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise . 74LS datasheet, 74LS pdf, 74LS data sheet, datasheet, data sheet, pdf, Fairchild Semiconductor, Synchronous 4-Bit Up/Down Counter with Mode.
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74LS – 74LS Up/Down Binary Counter
Synchronous operation is provided by hav. This mode of operation eliminates the output count.
The outputs of the datashedt master-slave flip-flops are triggered. A HIGH at the enable input inhibits. Level changes at either the enable input or the. The direction of the count is determined by the level.
74LS Datasheet(PDF) – Fairchild Semiconductor
When LOW, the counter counts up. The counter is fully programmable; that is, the outputs may. Two outputs have been made available to perform the cas.
The latter output produces a high-level output pulse with a. The counters can be. Devices also available in Tape and Reel. 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. This mode of operation eliminates the output count- ing spikes normally associated with asynchronous ripple clock counters.
PDF 74LS191 Datasheet ( Hoja de datos )
A HIGH at the enable input inhibits counting. The 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 divid- ers by simply modifying the count length with the preset inputs.
Two outputs have been made available to perform the cas- cading function: 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 datasneet 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.
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