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54ACT373 Datasheet(PDF) 3 Page - Texas Instruments |
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54ACT373 Datasheet(HTML) 3 Page - Texas Instruments |
3 / 12 page Connection Diagrams Functional Description The ’AC/’ACT373 contains eight D-type latches with TRI-STATE standard outputs. When the Latch Enable (LE) input is HIGH, data on the D n 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 tran- sition of LE. The TRI-STATE standard outputs are controlled by the Output Enable (OE) input. When OE is LOW, the stan- dard 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. Truth Table Inputs Outputs LE OE D n O n XHX Z HL L L HLH H LL X O 0 H = HIGH Voltage Level L = LOW Voltage Level Z = High Impedance X = Immaterial O0 = Previous O0 before HIGH to Low transition of Latch Enable Pin Assignment for DIP and Flatpak DS100329-3 Pin Assignment for LCC DS100329-4 www.national.com 2 |
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