Datenblatt-Suchmaschine für elektronische Bauteile |
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74F673A Datenblatt(PDF) 2 Page - Fairchild Semiconductor |
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74F673A Datenblatt(HTML) 2 Page - Fairchild Semiconductor |
2 / 7 page www.fairchildsemi.com 2 Unit Loading/Fan Out Functional Description The 16-bit shift register operates in one of four modes, as indicated in the Shift Register Operations Table. A HIGH signal on the Chip Select (CS) input prevents clocking and forces the Serial Input/Output (SI/O) 3-STATE buffer into the high impedance state. During serial shift-out opera- tions, the SI/O buffer is active (i.e., enabled) and the output data is also recirculated back into the shift register. When parallel loading the shift register from the storage register, serial shifting is inhibited. The storage register has an asynchronous master reset (STMR) input that overrides all other inputs and forces the Q0–Q15 outputs LOW. The storage register is in the Hold mode when either CS or the Read/Write (R/W) input is HIGH. With CS and R/W both LOW, the storage register is parallel loaded from the shift register. Shift Register Operations Table H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial = HIGH-to-LOW Transition Storage Register Operations Table H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial = LOW-to-HIGH Transition Pin Names Description U.L. Input IIH/IIL HIGH/LOW Output IOH/IOL CS Chip Select Input (Active LOW) 1.0/1.0 20 µA/−0.6 mA SHCP Shift Clock Pulse Input (Active Falling Edge) 1.0/1.0 20 µA/−0.6 mA STMR Store Master Reset Input (Active LOW) 1.0/1.0 20 µA/−0.6 mA STCP Store Clock Pulse Input 1.0/1.0 20 µA/−0.6 mA R/W Read/Write Input 1.0/1.0 20 µA/−0.6 mA SI/O Serial Data Input or 3.5/1.0 70 µA/−0.6 mA 3-STATE Serial Output 150/40 −3 mA/24 mA Q0–Q15 Parallel Data Outputs 50/33.3 −1 mA/20 mA Control Inputs SI/O Operating Mode CS R/W SHCP STCP Status H X X X High Z Hold L L X Data In Serial Load LH L Data Out Serial Output with Recirculation LH H Active Parallel Load; No Shifting Control Inputs Operating STMR CS R/W STCP Mode L X X X Reset; Outputs LOW H H X X Hold HX HX Hold HL L Parallel Load |
Ähnliche Teilenummer - 74F673A |
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Ähnliche Beschreibung - 74F673A |
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