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74F533SMQB 데이터시트(PDF) 2 Page - National Semiconductor (TI) |
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74F533SMQB 데이터시트(HTML) 2 Page - National Semiconductor (TI) |
2 / 8 page Unit LoadingFan Out 54F74F Pin Names Description UL Input IIH IIL HIGHLOW Output IOH IOL D0–D7 Data Inputs 1010 20 mA b06 mA LE Latch Enable Input (Active HIGH) 1010 20 mA b06 mA OE Output Enable Input (Active LOW) 1010 20 mA b06 mA O0–O7 Complementary TRI-STATE Outputs 15040 (333) b 3 mA24 mA (20 mA) Function Table Inputs Output LE OE DO HL H L HL L H LL X O0 XH X Z H e HIGH Voltage Level L e LOW Voltage Level X e Immaterial Functional Description The ’F533 contains eight D-type latches with TRI-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 ie 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 in- puts 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 Logic Diagram TLF9548 – 5 Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays 2 |
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