TXS0104EZXUR datasheet(10/24 Pages) TI

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CCA

10 k

CCB

10 k

One-shot

Gate Bias

Input Driver Requirements

Power Up

Enable and Disable

Pullup or Pulldown Resistors on I/O Lines

TXS0104E

SCES651D – JUNE 2006 – REVISED MAY 2008............................................................................................................................................................... www.ti.com

Figure 1. Architecture of a TXS01xx Cell

Each A-port I/O has an internal 10-k

Ω pullup resistor to VCCA, and each B-port I/O has an internal 10-kΩ pullup

resistor to VCCB. The output one-shots detect rising edges on the A or B ports. During a rising edge, the one-shot

turns on the PMOS transistors (T1,T2) for a short duration, which speeds up the low-to-high transition.

The fall time (tfA, tfB) of a signal depends on the output impedance of the external device driving the data I/Os of

the TXS0104E. Similarly, the tPHL and max data rates also depend on the output impedance of the external

driver. The values for tfA, tfB, tPHL, and maximum data rates in the data sheet assume that the output impedance

of the external driver is less than 50

Ω.

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 TXS0104E has an OE input that is used to disable the device by setting OE low, which places all I/Os in the

Hi-Z state. The disable time (tdis) indicates the delay between the time 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.

Each A-port I/O has an internal 10-k

Ω pullup resistor to VCCA, and each B-port I/O has an internal 10-kΩ pullup

resistor to VCCB. If a smaller value of pullup resistor is required, an external resistor must be added from the I/O

to VCCA or VCCB (in parallel with the internal 10-kΩ resistors).

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