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MC74ACT350D Datasheet(PDF) 2 Page - Motorola, Inc |
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MC74ACT350D Datasheet(HTML) 2 Page - Motorola, Inc |
2 / 9 page MC74AC350 MC74ACT350 5-2 FACT DATA FUNCTIONAL DESCRIPTION The MC74AC350/74ACT350 is operationally equivalent to a 4-input multiplexer with the inputs connected so that the select code causes successive one-bit shifts of the data word. This internal connection makes it possible to perform shifts of 0, 1, 2 or 3 places on words of any length. A 7-bit data word is introduced at the In inputs and is shifted according to the code applied to the select inputs S0, S1. Outputs O0–O3 are 3-state, controlled by an active-LOW output enable (OE). When OE is LOW, data outputs will follow selected data inputs; when HIGH, the data outputs will be forced to the high-impedance state. This feature allows shifters to be cascaded on the same output lines or to a common bus. The shift function can be logical, with zeros pulled in at either or both ends of the shifting field; arithmetic, where the sign bit is repeated during a shift down; or end around, where the data word forms a continuous loop. LOGIC EQUATIONS O0=S0 S1 I0+S0 S1 I–1+S0 S1 I–2+S0 S1 I–3 O1=S0 S1 I1+S0 S1 I0+S0 S1 I–1+S0 S1 II–2 O2=S0 S1 I2+S0 S1 I1+S0 S1 I0+S0 S1 I–1 O3=S0 S1 I3+S0 S1 I2+S0 S1 I1+S0 S1 I0 LOGIC DIAGRAM I–3 I–2 I–1 I0 I1 I2 I3 S1 S0 OE O0 O1 O2 O3 |
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