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9 / 23 page ST2149B Supplementary notes Doc ID 023310 Rev 1 9/23 4 Supplementary notes 4.1 Driver requirement For proper operation, the driver from each side of the device must be able to source and sink a minimum of 1 mA current. The device architecture requires the driver to source/sink maximum current of (VCC/4) mA to/from the weak 4 kΩ output buffer. 4.2 Load driving capability To support the architecture that allows level translation without the direction pin, the one-shot transistor is turned ON only during state transition at the output side. After the one-shot transistor is turned OFF, only the 4 k Ω resistor maintains the output logic state. So, a resistive load or pull-up resistor less than 50 k Ω is not recommended for proper operation. 4.3 Truth table Table 3. Truth table Enable Bi-directional input/output OE I/OVCC I/OVL H(1) 1. High level VL power supply referred. H(2) 2. High level VCC power supply referred. H(1) H(1) LL LZ(3) 3. Z = high impedance. Z(3) |
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