The AC161 devices are 4-bit binary Counters These synchronous, presettable Counters feature an internal carry look-ahead for application in high-speed counting These devices are fully programmable; that is, they CAN be preset to any number between 0 and 9 or 15. Presetting is synchronous; therefore, 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. The clear function is asynchronous. A low level at the clear (CLR) input sets all four of the Flip-Flop outputs low, regardless of the levels of the CLK, load (LOAD), or enable inputs. The carry look-ahead circuitry provides for cascading Counters for n-bit synchronous applications without additional gating. Instrumental in accomplishing this function are ENP, ENT, and a ripple-carry output (RCO). Both ENP and ENT must be high to count, and ENT is fed forward to enable RCO. Enabling RCO produces a high-level pulse while the count is maximum (9 or 15, with QA high). This high-level overflow ripple-carry pulse CAN be used to enable successive cascaded stages. Transitions at ENP or ENT are allowed, regardless of the level of CLK. By Texas Instruments
Part Manufacturer Description Datasheet Samples
CD54AC161F3A Texas Instruments Synchronous Presettable Binary Counters with Asynchronous Reset 16-CDIP -55 to 125
CD54AC161 's PackagesCD54AC161 's pdf datasheet

CD54AC161 Pinout, Pinouts
CD54AC161 pinout,Pin out
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