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CD74FCT646 Datasheet(PDF) 2 Page - Texas Instruments |
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CD74FCT646 Datasheet(HTML) 2 Page - Texas Instruments |
2 / 8 page 8-68 Functional Diagram TRUTH TABLE (Note 1) INPUTS DATA I/O (Note 2) OPERATION OR FUNCTION OE DIR CAB CBA SAB SBA A0 THRU A7 B0 THRU B7 CD74FCT646 X X X X ↑ X X ↑ X X X X Input Not Specified Not Specified Input Store A, B Unspecified 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 NOTES: 1. H= HIGH Voltage Level L = LOW Voltage Level ↑ = Transition from Low to High X = Immaterial 2. The data output functions may be enabled or disabled by various signals at the OE and DIR inputs. Data input functions are always en- abled, i.e., data at the bus pins will be stored on every low to high transition of the clock inputs. To prevent excess currents in the high Z modes, all I/O terminals should be terminated with 10k Ω resistors. 4 5 6 7 8 9 10 11 20 19 18 17 16 15 14 13 B0 B1 B2 B3 B4 B5 B6 B7 A0 A1 A2 A3 A4 A5 A6 A7 B DATA PORT A DATA PORT OE DIR CAB CLOCK CBA CLOCK 21 3 1 23 2 22 SAB SOURCE SBA SOURCE DATA SOURCE SELECTION INPUTS FLIP-FLOP CLOCKS GND = PIN 12 VCC = PIN 24 CD74FCT646 |
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