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HD74LS163AP

Renesas
Part Number HD74LS163AP
Manufacturer Renesas
Description Synchronous 4-bit Binary Counter
Published Jul 25, 2021
Detailed Description HD74LS163A Synchronous 4-bit Binary Counter (direct clear) REJ03D0447–0200 Rev.2.00 Feb.18.2005 This synchronous 4-bi...
Datasheet PDF File HD74LS163AP PDF File

HD74LS163AP
HD74LS163AP


Overview
HD74LS163A Synchronous 4-bit Binary Counter (direct clear) REJ03D0447–0200 Rev.
2.
00 Feb.
18.
2005 This synchronous 4-bit binary counter features an internal carry look-ahead for application in high-speed counting designs.
Synchronous operation is provided by having all flip-flops clocked simultaneously so that the outputs changes coincident with each other when so instructed by the count-enable inputs and internal gating.
This mode of operation eliminates the output counting spikes that are normally associated with asynchronous (ripple clock) counters.
A buffered clock input triggers the four flip-flops on the rising (positive-going) edge of the clock input waveform.
This counter is fully programmable; that is, the output may be preset to either level.
As presetting is synchronous, setting up a low level at the load input disables the counter and causes the outputs to agree with the setup data after the next clock pulse regardless of the levels of the enable inputs.
Low-to-high transitions at the load input would be avoided when the clock is low if the enable inputs are high at or before the transition.
The clear function is asynchronous and a low level at the clear input sets all four of the flip-flop outputs low after the next clock pulse, regardless of the levels of the enable inputs.
This synchronous clear allows the count length to be modified easily as decoding the maximum count desired can be accomplished with one external NAND gate.
The gate output is connected to the clear input to synchronously clear the counter to LLLL.
Low-to-high transitions at the clear input should be avoided when the clock is low if the enable and load inputs are high at or before the transition.
The carry look-ahead circuitry provides for cascading counters for n-bit synchronous applications without additional getting.
Instrumental in accomplishing this function are two count-enable inputs and a ripple carry output.
Both count-enable inputs (P and T) must be high to count, and inpu...


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