SoC

GPS

Module

B1

DIR1

A1

0.7 V

3.3 V

0.1 µF

0.1 µF

SN74AXC4T774

GND

CLK

CLK

DIR2

DIR4

B2

A2

MOSI

MOSI

B3

A3

MISO

MISO

B4

A4

SS

SS

GPIO1

Pullup Resistors keep device disabled

during power up. OE inputs may also

be tied to GND to keep device enabled

OE

DIR3

22

SN74AXC4T774

SCES898 – JULY 2019

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Product Folder Links: SN74AXC4T774

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Copyright © 2019, Texas Instruments Incorporated

9 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.

9.1 Application Information

The SN74AXC4T774 device can be used in level-translation applications for interfacing devices or systems

operating at different interface voltages with one another. The SN74AXC4T774 device is ideal for use in

applications where a push-pull driver is connected to the data I/Os. The max data rate can be up to 310 Mbps

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

One example application is shown in Figure 10, where the SN74AXC4T774 device is used to translate a low

voltage SPI signal from an SoC to a higher voltage signal to properly drive the inputs of a GPS module, and vice

versa.

9.2 Typical Application

Figure 10. Serial Peripheral Interface (SPI) Application

9.2.1 Design Requirements

For this design example, use the parameters listed in Table 3.

Table 3. Design Parameters

DESIGN PARAMETERS

EXAMPLE VALUES

Input voltage range

0.65 V to 3.6 V

Output voltage range

0.65 V to 3.6 V