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CD74HCT163M 데이터시트(PDF) 2 Page - Texas Instruments |
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CD74HCT163M 데이터시트(HTML) 2 Page - Texas Instruments |
2 / 10 page 2 Functional Diagram SPE CP MR PE TE 9 2 1 7 10 3456 14 13 12 11 15 Q0 Q1 Q2 Q3 TC P0 P1 P2 P3 MODE SELECT - FUNCTION TABLE FOR CD74HC/HCT161 OPERATING MODE INPUTS OUTPUTS MR CP PE TE SPE Pn Qn TC Reset (Clear) L XXXXX L L Parallel Load H ↑ XX l l L L H ↑ X X l h H (Note 3) Count H ↑ h h h (Note 5) X Count (Note 3) Inhibit H X I (Note 4) X h (Note 5) X qn (Note 3) H X X I (Note 4) h (Note 5) X qn L MODE SELECT - FUNCTION TABLE FOR CD74HC/HCT163 OPERATING MODE INPUTS OUTPUTS MR CP PE TE SPE Pn Qn TC Reset (Clear) l ↑ XXXX L L Parallel Load h (Note 5) ↑ XX l l L L h (Note 5) ↑ X X l h H (Note 3) Count h (Note 5) ↑ h h h (Note 5) X Count (Note 3) Inhibit h (Note 5) X I (Note 4) X h (Note 5) X qn (Note 3) h (Note 5) X X I (Note 4) h (Note 5) X qn L NOTE: H = High voltage level steady state; L = Low voltage level steady state; h = High voltage level one setup time prior to the Low-to-High clock transition; l = Low voltage level one setup time prior to the Low-to-High clock transition; X = Don’t Care; q = Lower case letters indicate the state of the referenced output prior to the Low-to-High clock transition; ↑ = Low-to-High clock transition. 3. The TC output is High when TE is High and the counter is at Terminal Count (HHHH for CD74HC/HCT161 and CD74HC/HCT163). 4. The High-to-Low transition of PE or TE on the CD74HC/HCT161 and the CD74HC/HCT163 should only occur while CP is HIGH for con- ventional operation. 5. The Low-to-High transition of SPE on the CD74HC/HCT161 and SPE or MR on the CD74HC/HCT163 should only occur while CP is HIGH for conventional operation. CD74HC161, CD74HCT161, CD74HC163, CD74HCT163 |
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