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SN74ABT16652DL Datasheet(PDF) 2 Page - Texas Instruments |
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SN74ABT16652DL Datasheet(HTML) 2 Page - Texas Instruments |
2 / 16 page SN54ABT16652, SN74ABT16652 16-BIT BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS SCBS215B – FEBRUARY 1991 – REVISED JANUARY 1997 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 description (continued) To ensure the high-impedance state during power up or power down, OEBA 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 (B to A). OEAB should be tied to GND through a pulldown resistor; the minimum value of the resistor is determined by the current-sourcing capability of the driver (A to B). The SN54ABT16652 is characterized for operation over the full military temperature range of –55 °C to 125°C. The SN74ABT16652 is characterized for operation from –40 °C to 85°C. FUNCTION TABLE INPUTS DATA I/O† OPERATION OR FUNCTION OEAB OEBA CLKAB CLKBA SAB SBA A1–A8 B1–B8 OPERATION OR FUNCTION L H H or L H or L X X Input Input Isolation L H ↑↑ X X Input Input Store A and B data X H ↑ H or L X X Input Unspecified‡ Store A, hold B H H ↑↑ X‡ X Input Output Store A in both registers L X H or L ↑ X X Unspecified‡ Input Hold A, store B L L ↑↑ XX‡ Output Input Store B in both registers 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 H H X X L X Input Output Real-time A data to B bus H H H or L X H X Input Output 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 † The data-output functions may be enabled or disabled by a variety of level combinations at OEAB or OEBA. 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. ‡ Select control = L; clocks can occur simultaneously. Select control = H; clocks must be staggered to load both registers. |
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