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74F825 Scheda tecnica(PDF) 2 Page - Fairchild Semiconductor |
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74F825 Scheda tecnica(HTML) 2 Page - Fairchild Semiconductor |
2 / 6 page www.fairchildsemi.com 2 Unit Loading/Fan Out Functional Description The 74F825 consists of eight D-type edge-triggered flip-flops. This device has 3-STATE true outputs and is organized in broadside pinning. In addition to the clock and output enable pins, 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. The 74F825 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 input transitions. Function Table L = LOW Voltage Level Z = High Impedance H = HIGH Voltage Level = LOW-to-HIGH Transition X = Immaterial 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–D7 Data Inputs 1.0/1.0 20 µA/−0.6 mA O0–O7 3-STATE Data Outputs 150/40 (33.3) −3 mA/24 mA (20 mA) OE1, OE2, OE3 Output Enable Input 1.0/1.0 20 µA/−0.6 mA EN Clock Enable 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 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 L 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 |
Codice articolo simile - 74F825_00 |
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Descrizione simile - 74F825_00 |
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