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SN74BCT646 数据表(PDF) 4 Page - Texas Instruments |
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SN74BCT646 数据表(HTML) 4 Page - Texas Instruments |
4 / 18 page SN54BCT646, SN74BCT646 OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3STATE OUTPUTS SCBS037D − AUGUST 1989 − REVISED MAY 2004 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 FUNCTION TABLE INPUTS DATA I/O OPERATION OR FUNCTION OE DIR CLKAB CLKBA SAB SBA A1 THRU A8 B1 THRU 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 the OE and DIR inputs. Data input functions always are enabled, i.e., data at the bus pins is stored on every low-to-high transition of the clock inputs. logic diagram (positive logic) A1 B1 1D C1 1D C1 One of Eight Channels 20 4 2 1 22 23 21 3 SAB CLKAB SBA CLKBA DIR OE To Seven Other Channels Pin numbers shown are for the DW, JT, NT, and W packages. |
类似零件编号 - SN74BCT646 |
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类似说明 - SN74BCT646 |
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