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

A common application for AND gates is the use in power sequencing. Power sequencing is often employed in

applications that require a processor or other delicate device with specific voltage timing requirements in order

to protect the device from malfunctioning. Using the SN74AHC08 to verify that the processor has turned on can

protect it from harmful signals.

9.2 Typical Application

Figure 9-1. Typical Application Diagram

9.2.1 Design Requirements

This device uses CMOS technology and has balanced output drive. Take care 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 must 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 Section 6.3 table.

• Specified High and low levels: See (VIH and VIL) in the Section 6.3 table.

• Inputs are overvoltage tolerant allowing them to go as high as 5.5 V at any valid VCC

2. Recommend output conditions

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

• Outputs should not be pulled above VCC

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SN54AHC08, SN74AHC08

SCLS236K – OCTOBER 1995 – REVISED JUNE 2023

Copyright © 2023 Texas Instruments Incorporated

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