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74HC390D 데이터시트(PDF) 4 Page - NXP Semiconductors |
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74HC390D 데이터시트(HTML) 4 Page - NXP Semiconductors |
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4 / 7 page ![]() December 1990 4 Philips Semiconductors Product specification Dual decade ripple counter 74HC/HCT390 Fig.4 Functional diagram. BCD COUNT SEQUENCE FOR 1/2 THE “390” Notes 1. Output Q0 connected to nCP1 with counter input on nCP0. H = HIGH voltage level L = LOW voltage level COUNT OUTPUTS Q0 Q1 Q2 Q3 0 LLLL 1 H LLL 2L H L L 3 HHL L 4 LLH L 5H L H L 6 L HHL 7 HHHL 8 LLLH 9 H LLH BI-QUINARY COUNT SEQUENCE FOR 1/2 THE “390” Note 1. Output Q3 connected to nCP0 with counter input on nCP1. COUNT OUTPUTS Q0 Q1 Q2 Q3 0 LLLL 1L H L L 2 LLH L 3 L HHL 4 LLLH 5 H LLL 6 HHL L 7H L H L 8 HHHL 9 H LLH Fig.5 Logic diagram (one counter). |
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