TXB0101DBVT datasheet(10/23 Pages) TI

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Input Driver Requirements

A. V is the input threshold voltage of the TXB0101 (typically

/2.

V is the supply voltage of the external driver.

CCI

–(V – V )/4 k

V /4 k

Power Up

Enable and Disable

Pullup or Pulldown Resistors on I/O Lines

TXB0101

SCES639A – JANUARY 2007 – REVISED NOVEMBER 2008........................................................................................................................................... www.ti.com

Typical IIN vs VIN characteristics of the TXB0101 are shown in Figure 2. For proper operation, the device driving

the data I/Os of the TXB0101 must have drive strength of at least ±2 mA.

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 TXB0101 has circuitry that disables all

output ports when either VCC is switched off (VCCA/B = 0 V).

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.

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

TXS01xx series of level translators.

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