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54FCT573 Datasheet(PDF) 2 Page - National Semiconductor (TI) |
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54FCT573 Datasheet(HTML) 2 Page - National Semiconductor (TI) |
2 / 7 page Functional Description The ’FCT573 contains eight D-type latches with TRI-STATE output buffers. 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 transition of LE. The TRI-STATE buffers are controlled by the Output Enable (OE) input. When OE is LOW, the buffers are in the bi-state mode. When OE is HIGH the buffers are in the high impedance mode but this does not interfere with entering new data into the latches. Function Table Inputs Outputs OE LE D O LH H H LH L L LL X O 0 HX X Z H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial O0 = Value stored from previous clock cycle Logic Diagram DS100951-3 Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays. www.national.com 2 |
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