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74LVC161PW Folha de dados(PDF) 4 Page - NXP Semiconductors |
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74LVC161PW Folha de dados(HTML) 4 Page - NXP Semiconductors |
4 / 14 page Philips Semiconductors Product specification 74LVC161 Presettable synchronous 4-bit binary counter; asynchronous reset 1998 May 20 4 FUNCTIONAL DIAGRAM PARALLEL LOAD CIRCUITRY BINARY COUNTER 34 56 TC 15 14 13 12 11 Q0 Q1 Q2 Q3 1 MR 2CP 7 D0 D1 D2 D3 CEP CET 10 PE 9 SY00068 STATE DIAGRAM 8 7 6 5 4 12 11 10 9 13 14 15 0 1 2 3 SF00664 FUNCTION TABLE OPERATING INPUTS OUTPUTS MODES MR CP CEP CET PE Dn Qn TC Reset (clear) L X X X X X L L Parallel load H ↑ X X l l L L Parallel load H ↑ X X l h H * Count H ↑ h h h X count * Hold H X l X h X qn * (do nothing) H X X l h X qn L NOTES: * = The TC output is High when CET is High and the counter is at Terminal Count (HHHH) H = High voltage level h = High voltage level one setup time prior to the Low-to-High clock transition L = Low voltage level l = Low voltage level one setup time prior to the Low-to-High clock transition q = Lower case letters indicate the state of the referenced output one setup time prior to the Low-to-High clock transition X = Don’t care ↑ = Low-to-High clock transition TYPICAL TIMING SEQUENCE CP PE TC MR INHIBIT COUNT CEP CET D0 D2 D1 D3 Q0 Q2 Q1 Q3 RESET PRESET 12 13 14 15 0 1 2 SY00069 Typical timing sequence: reset outputs to zero; preset to binary twelve; count to thirteen, fourteen, fifteen, zero, one, and two; inhibit |
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Descrição semelhante - 74LVC161PW |
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