SN54/74LS is an UP/DOWN MODULO Binary Counter. Separate. Count Up and Count Down Clocks are used and in either counting mode the. 74LS datasheet, 74LS pdf, 74LS data sheet, datasheet, data sheet, pdf, Fairchild Semiconductor, Synchronous 4-Bit Binary Counter with Dual Clock. This circuit is a synchronous up down 4-bit binary counter. Synchronous operation is provided by having all flip-flops clocked simultaneously so that the outputs.
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The counters can then datashete easily cascaded by feeding the borrow and carry outputs to the count down and count up inputs respectively of the succeeding counter. These counters were designed to be cascaded without the need for external circuitry. View PDF for Mobile. The clear, count, and load inputs are buffered to lower the drive requirements of clock drivers, etc.
The borrow output produces a pulse equal in.
The counter dattasheet fully programmable; that is, each output may be preset to either level by entering the desired data datashheet the inputs while the load input is LOW. Fairchild Semiconductor Electronic Components Datasheet. Similarly, the carry output produces a pulse equal in width to the count down input when an overflow condition exists. A clear input has been provided which, when taken to a high level, forces all outputs to the low level; independent of the count and load inputs.
Dataeheet counters can then be easily cascaded by feeding the. The direction of counting is determined by which. The counter is fully programmable; that is, each output may.
74LS Datasheet PDF –
Features s Fully independent clear input s Synchronous operation s Cascading circuitry provided internally s Individual preset each flip-flop Ordering Code: This mode of operation eliminates the output counting spikes normally associated with asynchronous ripple- clock counters.
Similarly, the carry output produces a pulse equal in width.
This feature allows the. The borrow output produces a pulse equal in width datashet the count down input when the counter underflows. The clear, count, and load.
Both borrow and carry outputs. The outputs of the four master-slave flip-flops are triggered. Both borrow and carry outputs are available to cascade both the up and down counting functions. Synchronous operation is provided by hav- ing all flip-flops clocked simultaneously, so that the outputs change together datahseet so instructed by the steering logic. The output will change independently of the count pulses. Synchronous operation is provided by hav.
These counters were designed to be cascaded without the. This mode of operation eliminates the output counting. The output will change. A clear input has been provided which, when taken to a. The direction of counting is determined by which count input is pulsed while the other count input is datsaheet HIGH.
This feature allows the counters to be used as modulo-N dividers by simply modi- fying the count length with the preset inputs.