OE1

V

CC

GND

A1

A8

Y1

Y8

Regulated 3.6 V

uC or

System Logic

uC

System Logic

LEDs

OE2

SN54LVC540A, SN74LVC540A

SCAS297N – JANUARY 1993 – REVISED JUNE 2014

www.ti.com

10 Application and Implementation

10.1 Application Information

The SN74LVC540A is a high drive CMOS device that can be used for a multitude of bus interface type

applications where the data needs to be retained or latched . It can produce 24 mA of drive current at 3.3 V

making it ideal for driving multiple outputs and good for high speed applications up to 100 MHz. The inputs are

10.2 Typical Application

Figure 5. Typical Application Diagram

10.2.1 Design Requirements

This device uses CMOS technology and has balanced output drive. Care should be taken 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 should be considered to prevent ringing.

10.2.2 Detailed Design Procedure

1. Recommended Input Conditions

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Rise time and fall time specs: See (

Δt/ΔV) in the Recommended Operating Conditions table.

–

–

2. Recommend Output Conditions

–

Load currents should not exceed 25 mA per output and 50 mA total for the part.

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10

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