2

19

1

SN74CB3T3245

Bus

Controller

8

Device

8

20

A1

NC

OE

0.1 2F

3

A2

4

A3

5

A4

6

A5

7

A6

8

A7

9

A8

10

GND

18

B1

17

B2

16

B3

15

B4

14

B5

13

B6

12

B7

11

B8

SN74CB3T3245

SCDS136B – OCTOBER 2003 – REVISED JUNE 2015

www.ti.com

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

This application is specifically to connect a 5-V bus to a 3.3-V device. It is assumed that communication in this

particular application is one-directional, going from the bus controller to the device.

9.2 Typical Application

Figure 8. Typical Application Schematic

9.2.1 Design Requirements

This device uses CMOS technology and has balanced output drive. Take care to avoid bus contention because it

can drive currents that would exceed maximum limits.

Because this design is for down-translating voltage, no pullup resistors are required.

9.2.2 Detailed Design Procedure

1. Recommended Input conditions

–

–

2. Recommend output conditions

–

Load currents should not exceed 128 mA on each channel

10

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