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CY74FCT646TQSOP Datasheet(PDF) 2 Page - Texas Instruments |
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CY74FCT646TQSOP Datasheet(HTML) 2 Page - Texas Instruments |
2 / 8 page CY54/74FCT646T 2 BUS B BUS A DIR L G L CPAB X CPBA X SAB X SBA L BUS B BUS A DIR H L X G L L H CPAB X CPBA X SAB X X X SBA X X X BUS B BUS A DIR H G L CPAB X CPBA X SAB L SBA X BUS A BUS A DIR L H G L L CPAB X Hor L CPBA Hor L X SAB X H SBA H X Real-Time Transfer Bus B to Bus A Real-Time Transfer Bus A to Bus B Storage from A and/or B Transfer Stored Data to A and/or B [1] Function Table[2] Inputs Data I/O[3] Operation or Function G DIR CPAB CPBA SAB SBA A1 thru A8 B1 thru B8 FCT646T H H X X H or L H or L X X X X Input Input Isolation Store A and B Data 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. Cannot transfer data to A bus and B bus simultaneously. 2. H = HIGH Voltage Level, L = LOW Voltage Level, = LOW-to-HIGH Transition, X = Don’t Care. 3. The data output functions may be enabled or disabled by various signals at the G or 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 clock inputs. |
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