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74F524 Datasheet(PDF) 2 Page - Fairchild Semiconductor |
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74F524 Datasheet(HTML) 2 Page - Fairchild Semiconductor |
2 / 9 page www.fairchildsemi.com 2 Unit Loading/Fan Out Note 1: OC = Open Collector Number Representation Select Table Select Truth Table Status Truth Table (Hold Mode) 1 = HIGH if data are equal, otherwise LOW H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial Pin Names Description U.L. Input IIH/IIL HIGH/LOW Output IOH/IOL S0, S1 Mode Select Inputs 1.0/1.0 20 µA/−0.6 mA C/SI Status Priority or Serial Data Input 1.0/1.0 20 µA/−0.6 mA CP Clock Pulse Input (Active Rising Edge) 1.0/1.0 20 µA/−0.6 mA SE Status Enable Input (Active LOW) 1.0/1.0 20 µA/−0.6 mA M Compare Mode Select Input 1.0/1.0 20 µA/−0.6 mA I/O0–I/O7 Parallel Data Inputs or 3.5/1.083 70 µA/−0.65 mA 3-STATE Parallel Data Outputs 150/40 (33.3) −3 mA/24 mA (20 mA) C/SO Status Priority or Serial Data Output 50/33.3 −1 mA/20 mA LT Register Less Than Bus Output OC (Note 1) /33.3 (Note 1) /20 mA EQ Register Equal Bus Output OC(Note 1) /33.3 (Note 1) /20 mA GT Register Greater Than Bus Output OC(Note 1) /33.3 (Note 1) /20 mA MOperation L Magnitude Compare H Twos Complement Compare S0 S1 Operation L L Hold—Retains Data in Shift Register L H Read—Read Contents in Register onto Data Bus, Data Remains in Register Unaffected by Clock H L Shift—Allows Serial Shifting on Next Rising Clock Edge H H Load—Load Data on Bus into Register Inputs Outputs SE C/SI Data Comparison EQ GT LT C/SO HH X HHH 1 LL OA–OH > I/O0–I/O7 LH H L XL OA–OH = I/O0–I/O7 HHH L HL OA–OH < I/O0–I/O7 LH H L HH OA–OH > I/O0–I/O7 LH L L HH OA–OH = I/O0–I/O7 HL L H LH OA–OH < I/O0–I/O7 LL H L |
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