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74F648SPMQB Datasheet(PDF) 3 Page - National Semiconductor (TI) |
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74F648SPMQB Datasheet(HTML) 3 Page - National Semiconductor (TI) |
3 / 12 page Unit LoadingFan Out 54F74F Pin Names Description UL Input IIH IIL HIGHLOW Output IOH IOL A0–A7 Data Register A Inputs 351083 70 mA b650 mA TRI-STATE Outputs 6001066 (80) b12 mA64 mA (48 mA) B0–B7 Data Register B Inputs 351083 70 mA b650 mA TRI-STATE Outputs 6001066 (80) b12 mA64 mA (48 mA) CPAB CPBA Clock Pulse Inputs 1010 20 mA b06 mA SAB SBA Select Inputs 1010 20 mA b06 mA G Output Enable Input 1010 20 mA b06 mA DIR Direction Control Input 1010 20 mA b06 mA Function Table Inputs Data IO Function G DIR CPAB CPBA SAB SBA A0–A7 B0–B7 H X H or L H or L X X Isolation HX L X X X Input Input Clock An Data into A Register HX X L X X Clock Bn Data into B Register LH X X L X An to Bn Real Time (Transparent Mode) LH L XL X Input Output Clock An Data into A Register L H H or L X H X A Register to Bn (Stored Mode) LH L X H X Clock An Data into A Register and Output to Bn LL X X X L Bn to An Real Time (Transparent Mode) LL X L XL Output Input Clock Bn Data into B Register L L X H or L X H B Register to An (Stored Mode) LL X L X H Clock Bn Data into B Register and Output to An The data output functions may be enabled or disabled by various signals at the G and DIR Inputs Data input functions are always enabled ie data at the bus pins will be stored on every LOW-to-HIGH transition of the clock inputs H e HIGH Voltage Level L e LOW Voltage Level X e Irrelevant L e LOW-to-HIGH Transition 3 |
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