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CD74HC646 Scheda tecnica(PDF) 2 Page - Texas Instruments |
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CD74HC646 Scheda tecnica(HTML) 2 Page - Texas Instruments |
2 / 14 page 2 Functional Diagram 20 19 18 17 15 13 14 16 4 B0 B1 B2 B3 B4 B5 B6 B7 OE DIR 21 3 6 11 5 7 8 9 10 A0 A1 A2 A3 A4 A5 A6 A7 1 23 2 22 CAB CLOCK CBA CLOCK SAB SOURCE SBA SOURCE GND = PIN 12 VCC = PIN 24 B DATA PORT A DATA PORT FLIP-FLOP CLOCKS DATA SOURCE SELECTION INPUTS FUNCTION TABLE INPUTS DATA I/O (NOTE 1) OPERATION OR FUNCTION OE DIR CAB CBA SAB SBA A0 THRU A7 B0 THRU B7 XX ↑ X X X Input Not Specified Store A, B Unspecified XXX ↑ X X Not Specified Input Store B, A Unspecified HX ↑↑ X X Input Input Store A and B Data H X H or L H or L X X Isolation, Hold Storage L L X X X L Output Input Real-Time B Data to A Bus L L X H or L X H Stored B Data to A Bus L H X X L X Input Output Real-Time A Data to B Bus L H H or L X H X Stored A Data to B Bus NOTE: 1. The data output functions may be enabled or disabled by various signals at the OE and DIR inputs. Data inputs functions are always enabled, i.e., data at the bus pins will be stored on every low-to-high transition on the clock inputs. To prevent excess currents in the High-Z modes all I/O terminals should be terminated with 10k Ω resistors. CD74HC646 CD74HC646 |
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