Datenblatt-Suchmaschine für elektronische Bauteile |
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CD74HC390 Datenblatt(PDF) 2 Page - Texas Instruments |
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CD74HC390 Datenblatt(HTML) 2 Page - Texas Instruments |
2 / 8 page 2 Functional Diagram 4 (12) 5 (11) 7 (9) nQ3 nQ1 nCP1 ÷ 5 nCP0 2 (14) 1 (15) 3 (13) nQ0 nMR ÷ 2 COUNTER COUNTER 6 (10) nQ2 GND = 8 VCC = 16 TRUTH TABLE INPUTS ACTION CP MR ↑ L No Change ↓ L Count X H All Qs Low NOTE: H = High Voltage Level, L = Low Voltage Level, X = Don’t Care, ↑ = Transition from Low to High Level, ↓ = Transition from High to Low. BCD COUNT SEQUENCE FOR 1/2 THE 390 COUNT OUTPUTS Q0 Q1 Q2 Q3 0LLLL 1 H LLL 2L H L L 3H HL L 4LL H L 5HLHL 6L H H L 7 HHH L 8LLL H 9HL L H NOTE: Output nQ0 connected to nCP1 with counter input on nCP0. B-QUINARY COUNT SEQUENCE FOR 1/2 THE 390 COUNT OUTPUTS Q0 Q1 Q2 Q3 0LLLL 1L H L L 2LL H L 3L H H L 4LLL H 5 H LLL 6 HHH L 7HLHL 8 HHH L 9HL L H NOTE: Output nQ3 connected to nCP0 with counter input on nCP1. CD74HC390, CD74HCT390 |
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