Processor 1

Digital Signals

Or

Digital Sensor Array

Processor 2

1A

1B

2A

2B

4A

4B

3A

3B

3Y

4Y

1Y

2Y

A/B

OE

When 0, Y is high impedance

0.1uF

Cbypass

Vcc

Gnd

Vcc=1.65V to 3.6V

Vcc=1.65V to 5V

Vcc=1.65V to 3.6V

SN54LVC257A, SN74LVC257A

www.ti.com

SCAS294O – JANUARY 1993 – REVISED JUNE 2015

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 SNx4LVC257A devices are useful for digital signal data selector or multiplexer applications.

10.2 Typical Application

The SNx4LVC257A devices use CMOS technology and have balanced output drive. These devices can be used

for down level translation and multiplexer function as shown in Figure 4.

Figure 4. SNx4LVC257A Used as Level Translation and as a Multiplexer

10.2.1 Design Requirements

Take care to avoid bus contention because it can drive currents that would exceed maximum limits. The high

drive will also create fast edges into light loads so routing and load conditions must be considered to prevent

ringing.

Copyright © 1993–2015, Texas Instruments Incorporated

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Product Folder Links: SN54LVC257A SN74LVC257A