Datasheet

Application Report
SCEA043–March 2010
A Guide to Voltage Translation With TXB-Type Translators
Susan Curtis, Dave Moon ....................................................................................... High Volume Linear
ABSTRACT
Modern trends are driving the need for lower supply voltages across many system-level designs. As most
processor voltage levels continue to decrease in the interest of achieving the lowest possible power
consumption, peripheral devices maintain a need for higher voltage levels, creating potential for voltage
discontinuities within a system. To remedy this mixed voltage system incompatibility, a voltage translator
can be used.
Texas Instruments High Volume Linear group offers a wide range of voltage level translators. A variety of
architectures provide solutions for different application environments including dual-supply
direction-controlled, auto-direction sensing, and application-specific memory card interface translators.
The information in this application report is intended to help system designers understand the architecture
and operation of the TXB-type auto-direction sensing translator family.
Contents
1 The Need For Voltage-Level Translation ................................................................................ 2
2 Auto-Direction Sensing Voltage Translator Architecture ............................................................... 2
3 Driving External Loads with TXB Translators ........................................................................... 5
4 Output Enable Control ...................................................................................................... 6
5 Conclusion ................................................................................................................... 6
List of Figures
1 Digital Switching Levels .................................................................................................... 2
2 Basic TXB010x Architecture............................................................................................... 3
3 Active Output Rising/Falling Edge-Rate Acceleration Circuitry and DC Resistor Paths........................... 3
4 Typical I
IN
vs V
IN
Curve ..................................................................................................... 4
5 TXB Active Output Rising Edge-Rate Acceleration Illustration ....................................................... 5
1
SCEA043–March 2010 A Guide to Voltage Translation With TXB-Type Translators
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