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SN74CBT3305CD 데이터시트(PDF) 2 Page - Texas Instruments |
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SN74CBT3305CD 데이터시트(HTML) 2 Page - Texas Instruments |
2 / 9 page SN74CBT3305C DUAL FET BUS SWITCH 5V BUS SWITCH WITH 2V UNDERSHOOT PROTECTION SCDS125A − SEPTEMBER 2003 − REVISED OCTOBER 2003 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 description/ordering information (continued) This device is fully specified for partial-power-down applications using Ioff. The Ioff feature ensures that damaging current will not backflow through the device when it is powered down. The device has isolation during power off. To ensure the high-impedance state during power up or power down, OE 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. FUNCTION TABLE (each bus switch) INPUT INPUT/OUTPUT FUNCTION INPUT OE INPUT/OUTPUT A FUNCTION H B A port = B port L Z Disconnect logic diagram (positive logic) 1A 1OE SW 1B 2A 2OE SW 2B 2 1 5 7 3 6 simplified schematic, each FET switch (SW) A EN† B † EN is the internal enable signal applied to the switch. Undershoot Protection Circuit |
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