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MC74ACT373DTG 데이터시트(PDF) 2 Page - ON Semiconductor |
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2 / 10 page MC74AC373, MC74ACT373 www.onsemi.com 2 TRUTH TABLE Inputs Outputs OE LE Dn On H X X Z L H L L L H H H L L X O0 H = HIGH Voltage Level L = LOW Voltage Level Z = High Impedance X = Immaterial O0 = Previous O0 before LOW-to-HIGH Transition of Clock FUNCTIONAL DESCRIPTION The MC74AC373/74ACT373 contains eight D−type latches with 3−state standard outputs. When the Latch Enable (LE) input is HIGH, data on the Dn inputs enters the latches. In this condition the latches are transparent, i.e., a latch output will change state each time its D input changes. When LE is LOW, the latches store the information that was present on the D inputs a setup time preceding the HIGH−to−LOW transition of LE. The 3-state standard outputs are controlled by the Output Enable (OE) input. When OE is LOW, the standard outputs are in the 2−state mode. When OE is HIGH, the standard outputs are in the high impedance mode but this does not interfere with entering new data into the latches. Figure 3. Logic Diagram D G O D G O D G O D G O D G O D G O D G O D G O D1 D2 D3 D4 D5 D6 D7 LE OE D0 NOTE: This diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays. |
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