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74ABT646A Datasheet(PDF) 4 Page - NXP Semiconductors |
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74ABT646A Datasheet(HTML) 4 Page - NXP Semiconductors |
4 / 14 page Philips Semiconductors Product specification 74ABT646A Octal bus transceiver/register (3-State) 1998 Feb 17 4 FUNCTION TABLE INPUTS DATA I/O OPERATING MODE OE DIR CPAB CPBA SAB SBA An Bn OPERATING MODE X X ↑ X X X Input Unspecified output* Store A, B unspecified X X X ↑ X X Unspecified output* Input Store B, A unspecified H H X X ↑ H or L ↑ H or L X X X X Input Input Store A and B data Isolation, hold storage L L L L X X X H or L X X L H Output Input Real time B data to A bus Stored B data to A bus L L H H X H or L X X L H X X Input Output Real time A data to B bus Stored A data to B bus H = High voltage level L = Low voltage level X = Don’t care ↑ = Low-to-High clock transition * The data output function may be enabled or disabled by various signals at the OE input. Data input functions are always enabled, i.e., data at the bus pins will be stored on every Low-to-High transition of the clock. LOGIC DIAGRAM 1D C1 Q 19 18 17 16 15 14 13 B1 B2 B3 B4 B5 B6 B7 5 6 7 8 9 10 11 A1 A2 A3 A4 A5 A6 A7 DETAIL A X 7 OE DIR CPBA SBA CPAB SAB 21 3 23 22 1 2 20 B0 1D C1 Q 4 A0 1of 8 Channels SA00086 |
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