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SN74LVTH541PWR Arkusz danych(PDF) 2 Page - Texas Instruments |
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SN74LVTH541PWR Arkusz danych(HTML) 2 Page - Texas Instruments |
2 / 13 page SN54LVTH541, SN74LVTH541 3.3V ABT OCTAL BUFFERS/DRIVERS WITH 3STATE OUTPUTS SCBS682G − MARCH 1997 − REVISED OCTOBER 2003 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 description/ordering information (continued) Active bus-hold circuitry holds unused or undriven inputs at a valid logic state. Use of pullup or pulldown resistors with the bus-hold circuitry is not recommended. 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. FUNCTION TABLE INPUTS OUTPUT OE1 OE2 A OUTPUT Y L L L L L LH H H XX Z X H X Z logic diagram (positive logic) OE1 OE2 To Seven Other Channels A1 Y1 1 19 218 |
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