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74VCX16841 bảng dữ liệu(PDF) 2 Page - Fairchild Semiconductor |
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74VCX16841 bảng dữ liệu(HTML) 2 Page - Fairchild Semiconductor |
2 / 9 page www.fairchildsemi.com 2 Connection Diagram Truth Tables H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial (HIGH or LOW, inputs may not float) Z = High Impedance O0 = Previous O0 before HIGH-to-LOW of Latch Enable Functional Description The 74VCX16841 contains twenty D-type latches with 3-STATE outputs. The device is byte controlled with each byte functioning identically, but independent of the other. Control pins can be shorted together to obtain full 20-bit operation. The following description applies to each byte. When the Latch Enable (LEn) input is HIGH, data on the Dn enters the latches. In this condition the latches are trans- parent, i.e., a latch output will change states each time its D-type input changes. When LEn is LOW, the latches store information that was present on the D-type inputs a setup time preceding the HIGH-to-LOW transition on LEn. The 3-STATE outputs are controlled by the Output Enable (OEn) input. When OEn is LOW the standard outputs are in the 2-state mode. When OEn is HIGH, the standard outputs 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 LE1 OE1 D0–D9 O0–O9 XH X Z HL L L HL H H LL X O0 Inputs Outputs LE2 OE2 D10–D19 O10–O19 XH X Z HL L L HL H H LL X O0 |
Số phần tương tự - 74VCX16841 |
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Mô tả tương tự - 74VCX16841 |
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