Error1

Error2

Error Flag

Sensor1

Sensor2

11

SN5400, SN54LS00, SN54S00

SN7400, SN74LS00, SN74S00

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SDLS025D – DECEMBER 1983 – REVISED MAY 2017

Product Folder Links: SN5400 SN54LS00 SN54S00 SN7400 SN74LS00 SN74S00

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Copyright © 1983–2017, Texas Instruments Incorporated

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 SNx4xx00 devices are quadruple, 2-input NAND gate. A typical application of NAND gate can be as an error

indicator as shown in Figure 3. If either of the sensor has an error, the error flag is high to indicate system error.

9.2 Typical Application

Figure 3. Typical Application Diagram

9.2.1 Design Requirements

These devices use BJT technology and have unbalanced output drive with IOL and IOH specified as per the

Recommended Operating Conditions.

9.2.2 Detailed Design Procedure

•

Recommended Input Conditions:

–

The inputs are TTL compliant.

–

Because the base-emitter junction at the inputs breaks down, no voltage greater than 5.5 V must be

applied to the inputs.

–

Specified high and low levels: See VIH and VIL in Recommended Operating Conditions.

•

Recommended Output Conditions:

–

No more than one output must be shorted at a time as per the Electrical Characteristics: SNx400 for

thermal stability and reliability.

–

For high-current applications, consider thermal characteristics of the package listed in Thermal

Information.