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74VHC573MX Datasheet(PDF) 2 Page - Fairchild Semiconductor |
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74VHC573MX Datasheet(HTML) 2 Page - Fairchild Semiconductor |
2 / 9 page ©1993 Fairchild Semiconductor Corporation www.fairchildsemi.com 74VHC573 Rev. 1.3 2 Logic Symbol IEEE/IEC Truth Table H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial Z = High Impedance Functional Description The VHC573 contains eight D-type latches with 3-STATE output 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 enabled. When OE is HIGH the buffers are in the high impedance mode, but, this does not interfere with entering new data into the latches. 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. Inputs Outputs OE LE D On LH H H LH L L LL X O0 HX X Z |
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