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, as well as validating and testing their design

implementation to confirm system functionality.

9.1 Application Information

In this application, the SN74HCS573-Q1 is used to control an 8-bit data bus.

Outputs can be held in the high-impedance state, held in the last known state, or change together with the data

inputs, depending on the control inputs at LE and OE coming from the bus controller.

9.2 Typical Application

1D

2D

3D

4D

5D

6D

7D

8D

LE

1Q

2Q

3Q

4Q

5Q

6Q

7Q

8Q

OE

Input Data Bus

Output Data Bus

Bus Controller

Figure 9-1. Typical application block diagram

9.2.1 Design Requirements

9.2.1.1 Power Considerations

Ensure the desired supply voltage is within the range specified in the Recommended Operating Conditions. The

supply voltage sets the device's electrical characteristics as described in the Electrical Characteristics.

The positive voltage supply must be capable of sourcing current equal to the total current to be sourced by all

and any transient current required for switching. The logic device can only source as much current as is provided

Absolute Maximum Ratings.

The ground must be capable of sinking current equal to the total current to be sunk by all outputs of the

current required for switching. The logic device can only sink as much current as can be sunk into its ground

connection. Be sure not to exceed the maximum total current through GND listed in the Absolute Maximum

Ratings.

The SN74HCS573-Q1 can drive a load with a total capacitance less than or equal to 50 pF while still meeting

all of the data sheet specifications. Larger capacitive loads can be applied; however, it is not recommended to

exceed 50 pF.

SN74HCS573-Q1

SCLS852 – DECEMBER 2021

www.ti.com

12

Submit Document Feedback

Copyright © 2021 Texas Instruments Incorporated

Product Folder Links: SN74HCS573-Q1