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SNJ54HC646W Datasheet(PDF) 2 Page - Texas Instruments |
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SNJ54HC646W Datasheet(HTML) 2 Page - Texas Instruments |
2 / 16 page SN54HC646, SN74HC646 OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS SCLS150C – DECEMBER 1982 – REVISED MARCH 2003 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 description/ordering information (continued) To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver. When an output function is disabled, the input function is still enabled and can be used to store data. Only one of the two buses, A or B, may be driven at a time. FUNCTION TABLE 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 always are enabled; i.e., data at the bus terminals is stored on every low-to-high transition of the clock inputs. |
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