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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Synchronous operation is provided by hav- ing all flip-flops clocked simultaneously, so that the outputs change together when so instructed by the steering datashest. This mode of operation eliminates the output counting spikes normally associated with asynchronous ripple- clock counters.
74LS Datasheet PDF –
The direction of counting is determined by which count input is pulsed while the other count input is held HIGH. The counter is fully programmable; that is, each output may be preset to either level by entering the desired data at the inputs while the load input is LOW. The output will change independently of the count pulses.
This feature allows the counters to be used as modulo-N dividers by simply modi- fying the count length with the preset inputs.
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. The clear, count, and load inputs are buffered to lower the drive requirements datashete clock drivers, etc.
These counters were designed to be cascaded without the need for external circuitry. Both borrow and carry outputs are available to cascade both the up and down counting functions. The borrow output produces a pulse equal in width to the count down input when the counter underflows.
Similarly, the carry output produces a pulse equal in width to the count down input when an overflow condition exists. The counters can then be easily cascaded by feeding the borrow and carry outputs to the count down and count up inputs respectively of the succeeding counter. Features s Fully independent clear input s Synchronous operation s Cascading circuitry provided internally s Individual preset each flip-flop Ordering Code: Synchronous operation is provided by hav.
This mode of operation eliminates the output counting. The outputs of the four master-slave flip-flops are triggered. The direction of counting is determined by which. The counter is fully programmable; that is, each output may. The output will change. This feature allows the.
Motorola – datasheet pdf
A clear input has been provided which, when taken to a. The clear, count, and load. These counters were designed to be cascaded without the. Both borrow and carry outputs. The borrow output produces a pulse equal in.
74LS193 Datasheet PDF
Similarly, the carry output produces a pulse equal in width. The counters can then be easily cascaded by feeding the.
Fairchild Semiconductor Electronic Components Datasheet. View PDF for Mobile.