TXB0101DBVT datasheet(12/31 Pages) TI1

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VCCA

VCCB

One

Shot

One

Shot

One

Shot

One

Shot

TXB0101

SCES639C – JANUARY 2007 – REVISED JUNE 2015

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Feature Description (continued)

Figure 5. Architecture of TXB0101 I/O Cell

8.3.2 Power Up

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 TXB0101 has circuitry that disables all

output ports when either VCC is switched off (VCCA/B = 0 V) and are placed in high-impedance state.

8.3.3 Enable and Disable

The TXB0101 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 are actually 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.

8.3.4 Pullup or Pulldown Resistors on I/O Lines

The TXB0101 is designed to drive capacitive loads of up to 70 pF. The output drivers of the TXB0101 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 TXB0101.

For the same reason, the TXB0101 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 TXS010X

series of level translators.

8.4 Device Functional Modes

The TXB0101 device has two functional modes, enabled and disabled. To disable the device set the OE input

low, which places all I/Os in a high-impedance state. Setting the OE input high will enable the device.

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