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74F350 датащи(PDF) 2 Page - Fairchild Semiconductor |
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74F350 датащи(HTML) 2 Page - Fairchild Semiconductor |
2 / 8 page www.fairchildsemi.com 2 Unit Loading/Fan Out Functional Description The 74F350 is operationally equivalent to a 4-input multi- plexer 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 4-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 dur- ing a shift down; or end around, where the data word forms a continuous loop. Logic Equations O0 = S0S1I0 + S0S1I−1 + S0S1I−2 + S0S1I−3 O1 = S0S1I1 + S0S1I0 + S0S1I−1 + S0S1I−2 O2 = S0S1I2 + S0S1I1 + S0S1I0 + S0S1I−1 O3 = S0S1I3 + S0S1I2 + S0S1I1 + S0S1I0 Logic Diagram Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays. Pin Names Description U.L. Input IIH/IIL HIGH/LOW Output IOH/IOL S0, S1 Select Inputs 1.0/2.0 20 µA/−1.2 mA I−3–I3 Data Inputs 1.0/2.0 20 µA/−1.2 mA OE Output Enable Input (Active LOW) 1.0/2.0 20 µA/−1.2 mA O0–O3 3-STATE Outputs 150/40 (33.3) −3 mA/24 mA (20 mA) |
Аналогичный номер детали - 74F350 |
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Аналогичное описание - 74F350 |
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