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74HCT4510DB Datasheet(PDF) 11 Page - NXP Semiconductors |
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74HCT4510DB Datasheet(HTML) 11 Page - NXP Semiconductors |
11 / 12 page December 1990 11 Philips Semiconductors Product specification BCD up/down counter 74HC/HCT4510 APPLICATION INFORMATION Fig.12 Cascading counter packages (parallel clocking). Terminal count (TC) lines at the 2nd, 3rd, etc. stages may have a negative-going glitch pulse resulting from differential delays of different 4510s. These negative-going glitches do not affect proper 4510 operation. However, if the terminal count signals are used to trigger other edge sensitive logic devices, such as flip-flops or counters, the terminal count signals should be gated with the clock signal using a 2-input OR gate such as HC/HCT32. Fig.13 Cascading counter packages (ripple clocking). Ripple clocking mode: the UP/DN control can be changed at any count. The only restriction on changing the UP/DN control is that the clock input to the first counting stage must be “HIGH”. For cascading counters operating in a fixed up-count or down-count mode, the OR gates are not required between stages and TC is connected directly to the CP input of the next stage with CE grounded. |
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