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CALVC164245IDLREP 데이터시트(PDF) 8 Page - Texas Instruments |
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CALVC164245IDLREP 데이터시트(HTML) 8 Page - Texas Instruments |
8 / 19 page www.ti.com Power-Up Considerations(1) SN74ALVC164245-EP 16-BIT 2.5-V TO 3.3-V/3.3-V TO 5-V LEVEL-SHIFTING TRANSCEIVER WITH 3-STATE OUTPUTS SCAS774A – JUNE 2004 – REVISED SEPTEMBER 2005 TI level-translation devices offer an opportunity for successful mixed-voltage signal design. A proper power-up sequence always should be followed to avoid excessive supply current, bus contention, oscillations, or other anomalies caused by improperly biased device pins. To guard against such power-up problems, take these precautions: 1. Connect ground before any supply voltage is applied. 2. Power up the control side of the device (VCCA for all four of these devices). 3. Tie OE to VCCA with a pullup resistor so that it ramps with VCCA. 4. Depending on the direction of the data path, DIR can be high or low. If DIR high is needed (A data to B bus), ramp it with VCCA. Otherwise, keep DIR low. (1) Refer to the TI application report, Texas Instruments Voltage-Level-Translation Devices, literature number SCEA021. 8 |
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