5 V LEDs, Relays,

or other system boards

OE

V

GND

A1

A8

B1

B8

Regulated 5 V

3.3 V µC

CC

DIR

or other system

boards

5 V LEDs, Relays,

or other system boards

OE

V

GND

A1

A8

B1

B8

Regulated 5 V or 3.3 V

µC

CC

DIR

5 V LEDs, Relays,

or other system

boards

µC

SN54HC245, SN74HC245

www.ti.com

SCLS131E – DECEMBER 1982 – REVISED SEPTEMBER 2015

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

The SNx4HC245 is a low-drive CMOS device that can 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.

9.2 Typical Application

Figure 4. Typical Application Schematic

9.2.1 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. Outputs can be combined to

produce higher drive but the high drive will also create faster edges into light loads, so routing and load

conditions should be considered to prevent ringing.

9.2.2 Detailed Design Procedure

1. Recommended Input Conditions

–

Rise time and fall time specs: See (

Δt/ΔV) in the Recommended Operating Conditions.

–

2. Recommend Output Conditions

–

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

–

Copyright © 1982–2015, Texas Instruments Incorporated

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Product Folder Links: SN54HC245 SN74HC245