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Counter Shift Register

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. The counters feature a fully independent clock circuit. Changes at control inputs (ENP, ENT, or LOAD) that modify the operating mode have no effect on the contents of the counter until clocking occurs. The function of the counter (whether enabled, disabled, loading, or counting) is dictated solely by the conditions meeting the stable setup and hold times.

Standard Logic > Counter Shift Register

Part No.	DS	Manufacturer	D/C	Qty	Region	Action
MC14040BCP		ONSemi	-	1	India	Request A Quote
MC14040BCP		ONSemi	200634+	29	U.S.A.	Request A Quote
MC14040BCP		ONSemi	-	50	U.S.A.	Request A Quote
MC14040BCP		ONSemi	2001	27	Canada	Request A Quote
MC14040BCP		ONSemi	2013	56000	South Korea	Request A Quote
MC14040BCP		ONSemi	-	2200	South Korea	Request A Quote
MC14040BCP		ONSemi	-	200	China	Request A Quote
MC14040BCP		ONSemi	200251	50	Canada	Request A Quote

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