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74AVCH2T45DCTRE4 Datasheet(PDF) 16 Page - Texas Instruments

Part No. 74AVCH2T45DCTRE4
Description  2-Supply, Bus Transceiver with Configurable Level-Shifting
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
Logo TI1 - Texas Instruments

74AVCH2T45DCTRE4 Datasheet(HTML) 16 Page - Texas Instruments

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V
CCA
V
CCA
V
CCB
SYSTEM-1
SYSTEM-2
V
CCA
1
2
3
4
8
7
6
5
V
CCB
V
CCB
VCCB
B1
B2
DIR
VCCA
A2
A1
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.
16
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Product Folder Links: SN74AVCH2T45


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