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74F676 Fiches technique(PDF) 2 Page - Fairchild Semiconductor |
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74F676 Fiches technique(HTML) 2 Page - Fairchild Semiconductor |
2 / 6 page www.fairchildsemi.com 2 Unit Loading/Fan Out Functional Description The 16-bit shift register operates in one of three modes, as indicated in the Shift Register Operations Table. HOLD— a HIGH signal on the Chip Select (CS) input pre- vents clocking, and data is stored in the sixteen registers. Shift/Serial Load— data present on the SI pin shifts into the register on the falling edge of CP. Data enters the Q0 position and shifts toward Q15 on successive clocks, finally appearing on the SO pin. Parallel Load— data present on P0–P15 are entered into the register on the falling edge of CP. The SO output repre- sents the Q15 register output. To prevent false clocking, CP must be LOW during a LOW-to-HIGH transition of CS. Shift Register Operations Table H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial = HIGH-to-LOW Transition Block Diagram Pin Names Description U.L. Input IIH/IIL HIGH/LOW Output IOH/IOL P0–P15 Parallel Data Inputs 1.0/1.0 20 µA/−0.6 mA CS Chip Select Input (Active LOW) 1.0/1.0 20 µA/−0.6 mA CP Clock Pulse Input (Active LOW) 1.0/1.0 20 µA/−0.6 mA M Mode Select Input 1.0/1.0 20 µA/−0.6 mA SI Serial Data Input 1.0/1.0 20 µA/−0.6 mA SO Serial Output 50/33.3 −1 mA/20 mA Control Input Operating Mode CS MCP HX X Hold LL Shift/Serial Load LH Parallel Load |
Numéro de pièce similaire - 74F676_02 |
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Description similaire - 74F676_02 |
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