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SN74AS648 Scheda tecnica(PDF) 3 Page - Texas Instruments |
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SN74AS648 Scheda tecnica(HTML) 3 Page - Texas Instruments |
3 / 18 page SN54ALS646, SN54ALS648, SN54AS646 SN74ALS646A, SN74ALS648A, SN74AS646, SN74AS648 OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS SDAS039F – DECEMBER 1983 – REVISED JANUARY 1995 3 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 Function Tables SN54ALS646, SN54AS646, SN74ALS646A, SN74AS646 INPUTS DATA I/O OPERATION OR FUNCTION OE DIR CLKAB CLKBA SAB SBA A1– A8 B1– B8 OPERATION OR FUNCTION X X ↑ X X X Input Unspecified† Store A, B unspecified† X XX ↑ X X Unspecified† Input Store B, A unspecified† H X ↑ ↑ X X Input Input Store A and B data H X H or L H or L X X Input disabled Input disabled 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 Output Input 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 Input Output Stored A data to B bus † The data output functions can be enabled or disabled by various signals at OE and DIR. Data input functions are always enabled; i.e., data at the bus terminals is stored on every low-to-high transition of the clock inputs. SN54ALS648, SN74ALS648A, SN74AS648 INPUTS DATA I/O OPERATION OR FUNCTION OE DIR CLKAB CLKBA SAB SBA A1– A8 B1– B8 OPERATION OR FUNCTION X X ↑ X X X Input Unspecified† Store A, B unspecified† X XX ↑ X X Unspecified† Input Store B, A unspecified† H X ↑ ↑ X X Input Input Store A and B data H X H or L H or L X X Input disabled Input disabled 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 Output Input 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 Input Output Stored A data to B bus † The data output functions can be enabled or disabled by various signals at OE and DIR. Data input functions are always enabled; i.e., data at the bus terminals is stored on every low-to-high transition of the clock inputs. |
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