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TXB0106RGYRG4 Datasheet(PDF) 10 Page - Texas Instruments |
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TXB0106RGYRG4 Datasheet(HTML) 10 Page - Texas Instruments |
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10 / 19 page  IIN VIN VT/4 k –(VD – VT)/4 k Power Up Enable and Disable Pullup or Pulldown Resistors on I/O Lines TXB0106 SCES709 – SEPTEMBER 2008 ......................................................................................................................................................................................... www.ti.com A. VT is the input threshold voltage of the TXB0106 (typically VCCI/ 2). B. VD is the supply voltage of the external driver. Figure 2. Typical IIN vs VIN Curve During operation, ensure that VCCA ≤ VCCB at all times. During power-up sequencing, VCCA ≥ VCCB does not damage the device, so any power supply can be ramped up first. The TXB0106 has circuitry that disables all output ports when either VCC is switched off (VCCA/B = 0 V). The TXB0106 has an OE input that is used to disable the device by setting OE = low, which places all I/Os in the high-impedance (Hi-Z) state. The disable time (tdis) indicates the delay between when OE goes low and when the outputs actually get disabled (Hi-Z). The enable time (ten) indicates the amount of time the user must allow for the one-shot circuitry to become operational after OE is taken high. The TXB0106 is designed to drive capacitive loads of up to 70 pF. The output drivers of the TXB0106 have low dc drive strength. If pullup or pulldown resistors are connected externally to the data I/Os, their values must be kept higher than 50 k Ω to ensure that they do not contend with the output drivers of the TXB0106. For the same reason, the TXB0106 should not be used in applications such as I2C or 1-Wire where an open-drain driver is connected on the bidirectional data I/O. For these applications, use a device from the TI TXS01xx series of level translators. 10 Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): TXB0106 |
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