4k

4k

A

B

One

Shot

One

Shot

One

Shot

One

Shot

T1

T2

T3

T4

TXB0104

SCES650E – APRIL 2006 – REVISED FEBRUARY 2010

www.ti.com

PRINCIPLES OF OPERATION

Applications

The TXB0104 can be used in level-translation applications for interfacing devices or systems operating at

different interface voltages with one another.

Architecture

The TXB0104 architecture (see Figure 1) does not require a direction-control signal to control the direction of

data flow from A to B or from B to A. In a dc state, the output drivers of the TXB0104 can maintain a high or low,

but are designed to be weak, so that they can be overdriven by an external driver when data on the bus starts

flowing the opposite direction.

The output one shots detect rising or falling edges on the A or B ports. During a rising edge, the one shot turns

on the PMOS transistors (T1, T3) for a short duration, which speeds up the low-to-high transition. Similarly,

during a falling edge, the one shot turns on the NMOS transistors (T2, T4) for a short duration, which speeds up

the high-to-low transition. The typical output impedance during output transition is 70

50

Figure 1. Architecture of TXB0104 I/O Cell

Input Driver Requirements

the data I/Os of the TXB0104 must have drive strength of at least ±2 mA.

10

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