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74HC590N Arkusz danych(PDF) 5 Page - NXP Semiconductors |
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74HC590N Arkusz danych(HTML) 5 Page - NXP Semiconductors |
5 / 21 page 74HC590_2 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 02 — 28 April 2009 5 of 21 NXP Semiconductors 74HC590 8-bit binary counter with output register; 3-state 6. Functional description [1] H = HIGH voltage level; L = LOW voltage level; X = don’t care; ↑ = LOW-to-HIGH transition; ↓ = HIGH-to-LOW transition. [2] RCO = Q0’ · Q1’ · Q2’ · Q3’ · Q4’ · Q5’ · Q6’ · Q7’ (Q0’ to Q7’ are internal outputs of the counter). Table 3. Function table[1] [2] Inputs Description OE CPR MRC CE CPC H X X X X Q outputs disable L X X X X Q outputs enable X ↑ X X X counter data stored into register X ↓ X X X register stage is not changed X X L X X counter clear XXH L ↑ advance one count XXH L ↓ no count X X H H X no count |
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