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74HC194D Datasheet(PDF) 4 Page - NXP Semiconductors |
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74HC194D Datasheet(HTML) 4 Page - NXP Semiconductors |
4 / 10 page December 1990 4 Philips Semiconductors Product specification 4-bit bidirectional universal shift register 74HC/HCT194 FUNCTION TABLE Notes 1. H = HIGH voltage level h = HIGH voltage level one set-up time prior to the LOW-to-HIGH CP transition L = LOW voltage level I = LOW voltage level one set-up time prior to the LOW-to-HIGH CP 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 CP transition X = don’t care ↑ = LOW-to-HIGH CP transition OPERATING MODES INPUTS OUTPUTS CP MR S1 S0 DSR DSL Dn Q0 Q1 Q2 Q3 reset (clear) X L XXXXX LLLL hold (“do nothing”) X H I I X X X q0 q1 q2 q3 shift left ↑ ↑ H H h h I I X X I h X X q1 q1 q2 q2 q3 q3 L H shift right ↑ ↑ H H I I h h I h X X X X L H q0 q0 q1 q1 q2 q2 parallel load ↑ Hh h X X dn d0 d1 d2 d3 Fig.4 Functional diagram. |
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