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SN54LVTH646 Datasheet(PDF) 2 Page - Texas Instruments |
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SN54LVTH646 Datasheet(HTML) 2 Page - Texas Instruments |
2 / 10 page SN54LVTH646, SN74LVTH646 3.3-V ABT OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS SCBS705E – AUGUST 1997 – REVISED APRIL 1999 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 description (continued) When an output function is disabled, the input function is still enabled and can be used to store and transmit data. Only one of the two buses, A or B, can be driven at a time. Active bus-hold circuitry is provided to hold unused or floating data inputs at a valid logic level. When VCC is between 0 and 1.5 V, the devices are in the high-impedance state during power up or power down. However, to ensure the high-impedance state above 1.5 V, 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. These devices are fully specified for hot-insertion applications using Ioff and power-up 3-state. The Ioff circuitry disables the outputs, preventing damaging current backflow through the devices when they are powered down. The power-up 3-state circuitry places the outputs in the high-impedance state during power up and power down, which prevents driver conflict. The SN54LVTH646 is characterized for operation over the full military temperature range of –55 °C to 125°C. The SN74LVTH646 is characterized for operation from –40 °C to 85°C. FUNCTION TABLE INPUTS DATA I/Os 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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