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74HC190N Folha de dados(PDF) 5 Page - NXP Semiconductors |
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74HC190N Folha de dados(HTML) 5 Page - NXP Semiconductors |
5 / 13 page December 1990 5 Philips Semiconductors Product specification Presettable synchronous BCD decade up/down counter 74HC/HCT190 FUNCTION TABLE TC AND RC FUNCTION TABLE Notes 1. H = HIGH voltage level L = LOW voltage level I = LOW voltage level one set-up time prior to the LOW-to-HIGH CP transition X = don’t care ↑ = LOW-to-HIGH CP transition = one LOW level pulse = TC goes LOW on a LOW-to-HIGH CP transition OPERATING MODE INPUTS OUTPUTS PL U/D CE CP Dn Qn parallel load L L X X X X X X L H L H count up H L I ↑ X count up count down H H I ↑ X count down hold (do nothing) H X H X X no change INPUTS TERMINAL COUNT STATE OUTPUTS U/D CE CP Q0 Q1 Q2 Q3 TC RC HH X H X X H L H LH X H X X H H H LL H X X H LH X L L L L L H HH X L L L L H H HL L L L L Fig.4 Functional diagram. |
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