8 Application and Implementation

Note

Information in the following applications sections is not part of the TI component specification, and

TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining

suitability of components for their purposes. Customers should validate and test their design

implementation to confirm system functionality.

8.1 Application Information

The SN74AXC2T45-Q1 device can be used in level-translation applications for interfacing devices or systems

operating at different interface voltages with one another. The SN74AXC2T45-Q1 device is ideal for use in

applications where a push-pull driver is connected to the data I/Os. The maximum data rate can be up to

380Mbps when device translates a signal from 1.8V to 3.3V.

Figure 8-1 shows one example application where the SN74AXC2T45-Q1 device is used to translate low voltage

error signals from a CPU to a higher voltage signal to properly drive the inputs of a system controller, thus

alerting the system of any CPU errors such as overheating or other catastrophic processor errors.

8.1.1 Enable Times

Calculate the enable times for the SN74AXC2T45-Q1 using the following formulas:

tA_en (DIR to A) = tdis (DIR to B) + tpd (B to A)

(1)

tB_en (DIR to A) = tdis (DIR to A) + tpd (A to B)

(2)

In a bidirectional application, these enable times provide the maximum delay time from the time the DIR bit is

switched until an output is expected. For example, if the SN74AXC2T45-Q1 initially is transmitting from A to B,

then the DIR bit is switched; the B port of the device must be disabled (tdis) before presenting it with an input.

After the B port has been disabled, an input signal applied to it appears on the corresponding A port after the

specified propagation delay (tpd). To avoid bus contention care should be taken to not apply an input signal prior

to the output port being disabled (tdis maximum).

8.2 Typical Application

System

Controller

CPU

B1

VCCA

VCCB

DIR

A1

2.5 V

0.7 V

0.1 µF

0.1 µF

SN74AXC2T45

GND

GPIO1

CAT ERR

B2

A2

GPIO2

PROC HOT

Figure 8-1. Processor Error Application

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SN74AXC2T45-Q1

SCES928B – APRIL 2021 – REVISED JANUARY 2024

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