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74F579 Datasheet(PDF) 2 Page - Fairchild Semiconductor |
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74F579 Datasheet(HTML) 2 Page - Fairchild Semiconductor |
2 / 7 page www.fairchildsemi.com 2 Unit Loading/Fan Out Function Table H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial = LOW to HIGH Clock Transition Not LL = CS and PE should never both be LOW voltage level at the same time. Pin Names Description U.L. Input IIH/IIL HIGH/LOW Output IOH/IOL I/O0–I/O7 Data Inputs or 3.5/0.333 70 µA/−0.2 mA 3-STATE Outputs 75/15 −3 mA/24 mA PE Parallel Enable Input (Active LOW) 0.25/0.333 5 µA/−0.2 mA U/D Up-Down Count Control Input 0.25/0.333 5 µA/−0.2 mA MR Master Reset Input (Active LOW) 0.25/0.333 5 µA/−0.2 mA SR Synchronous Reset Input (Active LOW) 0.25/0.333 5 µA/−0.2 mA CEP Count Enable Parallel Input (Active LOW) 0.25/0.333 5 µA/−0.2 mA CET Count Enable Trickle Input (Active LOW) 0.25/0.333 5 µA/−0.2 mA CS Chip Select Input Active (Active LOW) 0.25/0.333 5 µA/−0.2 mA OE Output Enable Input (Active LOW) 0.25/0.333 5 µA/−0.2 mA CP Clock Pulse Input (Active Rising Edge) 0.25/0.333 5 µA/−0.2 mA TC Terminal Count Output (Active LOW) 25/12.5 −1 mA/5 mA MR SR CS PE CEP CET U/D OE CP Function X X H X XXX XX I/Oa to I/Oh in High Z (PE Disabled) X X L H XXX H X I/Oa to I/Oh in High Z X X L H X X X L X Flip-Flop Outputs Appear on I/O Lines L X X X X X X X X Asynchronous Reset for all Flip-Flops H L XX XXX X Synchronous Reset for all Flip-Flops H H L L XXX X Parallel Load all Flip-Flops H H (Not LL) H X X X Hold H H (Not LL) X H X X Hold (TC Held HIGH) H H (Not LL) L L H X Count Up H H (Not LL) L L L X Count Down |
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