C or System

Logic

SNx4AHCT240

A1

A4

OE

Y1

Y2

GND

C/System

Logic/LEDs

5 V

3.3 V

9

SN54AHCT240, SN74AHCT240

www.ti.com

SCLS252M – OCTOBER 1995 – REVISED APRIL 2016

Product Folder Links: SN54AHCT240 SN74AHCT240

Submit Documentation Feedback

Copyright © 1995–2016, Texas Instruments Incorporated

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 SNx4AHCT240 is a low-drive CMOS device that may be used for a multitude of bus interface type

applications where output ringing is a concern. The low drive and slow edge rates will minimize overshoot and

undershoot on the outputs. The input switching levels have been lowered to accommodate TTL inputs of 0.8-V

shows this type of translation.

10.2 Typical Application

Figure 3. 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; therefore, routing and load conditions should be considered to prevent ringing.

10.2.2 Detailed Design Procedure

1. Recommended Input Conditions:

–

For rise time and fall time specifications, see

Δt/ΔV in the Recommended Operating Conditions table.

–

–

2. Recommend Output Conditions:

–

Load currents should not exceed 25 mA per output and 75 mA total for the part.

–