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74HCT195 Arkusz danych(PDF) 4 Page - NXP Semiconductors |
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74HCT195 Arkusz danych(HTML) 4 Page - NXP Semiconductors |
4 / 9 page December 1990 4 Philips Semiconductors Product specification 4-bit parallel access shift register 74HC/HCT195 APPLICATIONS • Serial data transfer • Parallel data transfer • Serial-to-parallel data transfer • Parallel-to-serial data transfer FUNCTION TABLE Notes 1. 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 one set-up time prior to the LOW-to-HIGH clock transition q, d = lower case letters indicate the state of the referenced input (or output) one set-up time prior to the LOW-to-HIGH clock transition X = don’t care ↑ = LOW-to-HIGH clock transition OPERATING MODES INPUTS OUTPUTS MR CP PE J KDn Q0 Q1 Q2 Q3 Q3 asynchronous reset L X X X X X L L L L H shift, set first stage shift, reset first stage shift, toggle first stage shift, retain first stage H H H H ↑ ↑ ↑ ↑ h h h h h l h l h l l h X X X X H L q0 q0 q0 q0 q0 q0 q1 q1 q1 q1 q2 q2 q2 q2 q2 q2 q2 q2 parallel load H ↑ lX X dn d0 d1 d2 d3 d3 Fig.4 Functional diagram. |
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