74AVCH2T45DCTRE4 datasheet(16/31 Pages) TI1 | 2-Supply, Bus Transceiver with Configurable Level-Shifting

16 / 31 page

CCA

CCB

SYSTEM-1

SYSTEM-2

CCA

CCB

VCCB

DIR

VCCA

GND

SN74AVCH2T45

SCES582H – JULY 2004 – REVISED APRIL 2015

www.ti.com

10 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.

10.1 Application Information

The SN74AVCH2T45 is used to shift IO voltage levels from one voltage domain to another. Each bus (bus A and

bus B) have independent power supplies, and a direction pin is used to control the direction of data flow.

10.2 Typical Applications

10.2.1 Unidirectional Logic Level-Shifting Application

Figure 8 is an example of the SN74AVCH2T45 circuit used in a unidirectional logic level-shifting application.

Figure 8. Unidirectional Logic Level-Shifting Application

10.2.1.1 Design Requirements

This device uses drivers which are enabled depending on the state of the DIR pin. The designer must know the

intended flow of data and take care not to violate any of the high or low logic levels. Active bus-hold circuitry

holds unused or un-driven inputs at a valid logic state. TI does not recommend using pull-up or pull-down

resistors with the bus-hold circuitry.

10.2.1.2 Detailed Design Procedure

Table 2 lists the pins and pin descriptions of the SN74AVCH2T45 connections with SYSTEM-1 and SYSTEM-2.

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74AVCH2T45DCTRE4 Datasheet(PDF) 16 Page - Texas Instruments