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74ALS161BD 데이터시트(PDF) 5 Page - NXP Semiconductors |
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74ALS161BD 데이터시트(HTML) 5 Page - NXP Semiconductors |
5 / 14 page Philips Semiconductors Product specification 74ALS161B/74ALS163B 4-bit binary counter 1991 Feb 08 5 LOGIC DIAGRAM – 74ALS161B R D CP Q Q R D CP Q Q R D CP Q Q R D CP Q Q 14 Q0 13 Q1 12 Q2 11 Q3 15 TC 6 D3 5 D2 4 D1 3 D0 7 CEP 10 CET 9 PE 1 MR 2 CP SF00662 VCC = Pin 16 GND = Pin 8 MODE SELECTION FUNCTION TABLE – 74ALS161B INPUTS OUTPUTS OPERATING MODE MR CP CEP CET PE Dn Qn TC OPERATING MODE L X X X X X L L Reset (clear) H ↑ X X l l L L Parallel load H ↑ X X l h H (a) Parallel load H ↑ h h h X count (a) Count h X l X h X qn (a) Hold (do nothing) h X X l h X qn L Hold (do nothing) H = High-voltage level h = High state must be present one setup time before the Low-to-High clock transition L = Low-voltage level l = Low state must be present one setup time before the Low-to-High clock transition qn = Lower case letters indicate the state of the referenced output prior to the Low-to-High clock transition X = Don’t care (a) = The output is High when CET is High and the counter is at terminal count (HHHH) ↑ = Low-to-High clock transition |
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