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74F823SC Datasheet(PDF) 2 Page - Fairchild Semiconductor |
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74F823SC Datasheet(HTML) 2 Page - Fairchild Semiconductor |
2 / 6 page www.fairchildsemi.com 2 Unit Loading/Fan Out Functional Description The 74F823 device consists of nine D-type edge-triggered flip-flops. It has 3-STATE true outputs and is organized in broadside pinning. The buffered Clock (CP) and buffered Output Enable (OE) are common to all flip-flops. The flip-flops will store the state of their individual D inputs that meet the setup and hold times requirements on the LOW-to-HIGH CP transition. With the OE LOW the con- tents of the flip-flops are available at the outputs. When the OE is HIGH, the outputs go to the high impedance state. Operation of the OE input does not affect the state of the flip-flops. In addition to the Clock and Output Enable pins, the 74F823 has Clear (CLR) and Clock Enable (EN) pins. When the CLR is LOW and the OE is LOW, the outputs are LOW. When CLR is HIGH, data can be entered into the flip-flops. When EN is LOW, data on the inputs is trans- ferred to the outputs on the LOW-to-HIGH clock transition. When the EN is HIGH, the outputs do not change state regardless of the data or clock inputs transitions. This device is ideal for parity bus interfacing in high perfor- mance systems. Function Table L = LOW Voltage Level H = HIGH Voltage Level X = Immaterial Z = High Impedance = LOW-to-HIGH Transition NC = No Change 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–D8 Data Inputs 1.0/1.0 20 µA/−0.6 mA OE Output Enable Input 1.0/1.0 20 µA/−0.6 mA CLR Clear 1.0/1.0 20 µA/−0.6 mA CP Clock Input 1.0/2.0 20 µA/−1.2 mA EN Clock Enable 1.0/1.0 20 µA/−0.6 mA O0–O8 3-STATE Outputs 150/40 (33.3) −3 mA/24 mA (20 mA) Inputs Internal Output Function OE CLR EN CP D Q O HHL H X NC Z Hold HHL L X NC Z Hold H H H X X NC Z Hold LH H X X NC NC Hold H L X X X H Z Clear L L X X X H L Clear HHL H H Z Load HHL H L Z Load LH L L H L Data Available LH L H L H Data Available L H L H X NC NC No Change in Data L H L L X NC NC No Change in Data |
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Descripción similar - 74F823SC |
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