器件名称: HD74LS160A
功能描述: Synchronous Decade Counter (direct clear)
文件大小: 203.79KB 共11页
简 介:HD74LS160A
Synchronous Decade Counter (direct clear)
REJ03D0444–0300 Rev.3.00 Jul.15.2005 This synchronous decade 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 is 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 of this device should 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. The carry look-ahead circuitry provides for cascading counters for n-bit synchronous applications without additional getting. Instrumental in accomplishing this function is two count-enable inputs and a ripple carry output. Both count-enable inputs (P and T) must be ……
