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

This device can be used to add an additional stage to a counter with an external flip-flop. Because counters

use a negative edge trigger, the flip-flop's clock input must be inverted to provide this function. This function

only requires one of the six available inverters in the device, so the remaining channels can be used for other

applications needing an inverted signal or improved signal integrity. Unused inputs must be terminated at VCC or

GND. Unused outputs can be left floating.

9.2 Typical Application

D-Typ e

Flip-Flop

Counter

2

0

2

1

2

2

2

3

2

4

Input

Clear

Q

CLR

Q

D

CLR

Figure 9-1. Typical application schematic

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 supply must be capable of sourcing current equal to the total current to be sourced by all outputs of the

CD74HC04 plus the maximum supply current, ICC, listed in the Electrical Characteristics. The logic device can

only source or sink as much current as it is provided at the supply and ground pins, respectively. Be sure not to

exceed the maximum total current through GND or VCC listed in the Absolute Maximum Ratings.

Total power consumption can be calculated using the information provided in CMOS Power Consumption and

Cpd Calculation.

Thermal increase can be calculated using the information provided in Thermal Characteristics of Standard Linear

and Logic (SLL) Packages and Devices.

CAUTION

The maximum junction temperature, TJ(max) listed in the Absolute Maximum Ratings, is an

additional limitation to prevent damage to the device. Do not violate any values listed in the Absolute

Maximum Ratings. These limits are provided to prevent damage to the device.

CD74HC04, CD54HC04

SCHS117F – AUGUST 1997 – REVISED APRIL 2021

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