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MC74ACT564 Datasheet(PDF) 2 Page - ON Semiconductor |
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MC74ACT564 Datasheet(HTML) 2 Page - ON Semiconductor |
2 / 9 page MC74AC564 MC74ACT564 http://onsemi.com 2 FUNCTIONAL DESCRIPTION The MC74AC564/74ACT564 consists of eight edge- triggered flip-flops with individual D-type inputs and 3-state complementary outputs. The buffered clock and buffered Output Enable are common to all flip-flops. The eight flip-flops will store the state of their individual D inputs that meet the setup and hold times requirements on the LOW-to-HIGH Clock (CP) transition. With the Output Enable (OE) LOW, the contents of the eight flip-flops are available at the outputs. When 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. FUNCTION TABLE Inputs Internal Outputs Function OE CP D Q O H H L NC Z Hold H HH NC Z Hold H LH Z Load H HL Z Load L LH H Data Available L HL L Data Available L HL NC NC No Change in Data L H H NC NC No Change in Data H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial Z = High Impedance = LOW-to-HIGH Transition NC = No Change Figure 3. Logic Diagram D0 D1 D2 D3 D4 D5 D6 D7 CD Q O0 O1 O2 O3 O4 O5 O6 O7 OE CP CD Q CD Q CD Q CD Q CD Q CD Q CD Q Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays. |
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