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74LV161PWDH Arkusz danych(PDF) 4 Page - NXP Semiconductors |
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74LV161PWDH Arkusz danych(HTML) 4 Page - NXP Semiconductors |
4 / 16 page Philips Semiconductors Product specification 74LV161 Presettable synchronous 4-bit binary counter; asynchronous reset 1997 May 15 4 FUNCTION TABLE OPERATING MODES INPUTS OUTPUTS OPERATING MODES MR CP CEP CET PE Dn Qn TC Reset (clear) L X X X X X L L Parallel load H ↑ X X I I L L Parallel load H ↑ X X I h H * Count H ↑ h h h X Count * Hold (do nothing) H X I X h X qn * Hold (do nothing) H X X I 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 set-up time prior to the LOW-to-HIGH clock transition L = LOW voltage level I = LOW voltage level level one set-up time prior to the LOW-to-HIGH clock transition q = lower case letters indicate the state of the referenced output one set-up time prior to the LOW-to-HIGH clock transition X = don’t care ↑ = LOW-to-HIGH clock transition STATE DIAGRAM SV00573 0 1 2 3 4 5 6 7 8 9 10 11 12 15 14 13 TYPICAL TIMING SEQUENCE SV00574 MR PE D 0 D 1 D 2 D 3 CP CEP CET Q 0 Q 1 Q 2 Q 3 TC reset preset count inhibit 13 14 15 0 1 2 12 Typical timing sequence: reset outputs to zero; preset to binary twelve; count to thirteen, fourteen, fifteen, zero, on and two; inhibit. |
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