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IDT74FCT646ATPYB Datasheet(PDF) 3 Page - Integrated Device Technology |
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IDT74FCT646ATPYB Datasheet(HTML) 3 Page - Integrated Device Technology |
3 / 9 page IDT54/74FCT646/2646/652/2652T/AT/CT/DT, 648T/AT/CT FAST CMOS OCTAL TRANSCEIVER/REGISTER MILITARY AND COMMERCIAL TEMPERATURE RANGES 6.20 3 FUNCTION TABLE (646/648) FUNCTION TABLE (652) Inputs Data I/O(1) Operation or Function G G DIR CPAB CPBA SAB SBA A1 - A8 B1 - B8 FCT646T/FCT2646T FCT648T H H X X H or L ↑ H or L ↑ X X X X Input Input Isolation Store A and B Data 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 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 Real-Time A Data to B Bus Stored A Data to B Bus 2634 tbl 02 Inputs Data I/O Operation or Function GAB GBA GBA CPAB CPBA SAB SBA A1 - A8 B1 - B8 FCT652T/FCT2652T L L H H H or L ↑ H or L ↑ X X X X Input Input Isolation Store A and B Data X H H H ↑ ↑ H or L ↑ X X(2) X X Input Input Unspecified(1) Output Store A, Hold B Store A in Both Registers L L X L H or L ↑ ↑ ↑ X X X X(2) Unspecified(1) Output Input Input Hold A, Store B Store B in Both Registers 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 H H 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 L H or L H or L H H Output Output Stored A Data to B Bus and Stored B Data to A Bus NOTES: 2634 tbl 03 1. The data output functions may be enabled or disabled by various signals at the GAB or GBA inputs. Data input functions are always enabled, i.e. data at the bus pins will be stored on every LOW-to-HIGH transition on the clock inputs. 2. Select control = L: clocks can occur simultaneously. Select control = H: clocks must be staggered in order to load both registers. H = HIGH, L = LOW, X = Don't Care, ≠ = LOW-to-HIGH transition. 3. A in B Register. 4. B in A Register. |
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