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74LCX646WM Datasheet(PDF) 2 Page - Fairchild Semiconductor |
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74LCX646WM Datasheet(HTML) 2 Page - Fairchild Semiconductor |
2 / 10 page www.fairchildsemi.com 2 Logic Symbols IEEE/IEC Truth Table (Note 2) H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial = LOW-to-HIGH Transition Note 2: The data output functions may be enabled or disabled by various signals at the OE and DIR inputs. Data input functions are always enabled; i.e., data at the bus pins will be stored on every LOW-to-HIGH transition of the appropriate clock inputs. Inputs Data I/O Function OE DIR CPAB CPBA SAB SBA A0–A7 B0–B7 H X H or L H or L X X Isolation HX X X X Input Input Clock An Data into A Register HX X X X Clock Bn Data into B Register LH X X L X An to Bn—Real Time (Transparent Mode) LH X L X Input Output Clock An Data into A Register L H H or L X H X A Register to Bn (Stored Mode) LH X H X Clock An Data into A Register and Output to Bn L L XXX L Bn to An—Real Time (Transparent Mode) LL X X L Output Input Clock Bn Data into B Register L L X H or L X H B Register to An (Stored Mode) LL X X H Clock Bn Data into B Register and Output to An |
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