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74F573PC Folha de dados(PDF) 2 Page - Fairchild Semiconductor |
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74F573PC Folha de dados(HTML) 2 Page - Fairchild Semiconductor |
2 / 7 page www.fairchildsemi.com 2 Unit Loading/Fan Out Functional Description The 74F573 contains eight D-type latches with 3-state out- put buffers. 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 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 H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial O0 = Value stored from previous clock cycle 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 D0–D7 Data Inputs 1.0/1.0 20 µA/−0.6 mA LE Latch Enable Input (Active HIGH) 1.0/1.0 20 µA/−0.6 mA OE 3-STATE Output Enable Input (Active LOW) 1.0/1.0 20 µA/−0.6 mA O0–O7 3-STATE Latch Outputs 150/40(33.3) −3 mA/24 mA (20 mA) Inputs Outputs OE LE D O L HHH LH L L LL X O0 HX X Z |
Nº de peça semelhante - 74F573PC |
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Descrição semelhante - 74F573PC |
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