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AN-90

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飞兆/仙童 - FAIRCHILD		/
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74C Family Characteristics

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Fairchild Semiconductor

Application Note 90

August 1973

74C Family Characteristics

INTRODUCTION

simple a manner as possible to facilitate its use. This

coupled with the fact that 54C/74C has the same function

and pin-out as standard series 54L/74L will make the appli-

cation of CMOS to digital systems very straightforward.

The purpose of this 54C/74C Family Characteristics applica-

tion note is to set down, in one place, all those characteris-

tics which are common to the devices in the MM54C/MM74C

logic family. The characteristics which can be considered to

apply are:

OUTPUT CHARACTERISTICS

Figure 1 and Figure 2 show typical output drain characteris-

tics for the basic inverter used in the 54C/74C family. For

more detailed information on the operation of the basic in-

verter the reader is directed to Application Note AN-77,

“CMOS, The Ideal Logic Family”. Although more complex

gates, and MSI devices, may be composed of combinations

of parallel and series transistors the considerations that gov-

ern the output characteristics of the basic inverter apply to

these more complex structures as well.

1. Output voltage-current characteristics

2. Noise characteristics

3. Power consumption

4. Propagation delay (speed)

5. Temperature characteristics

With a good understanding of the above characteristics the

designer will have the necessary tools to optimize his sys-

tem. An attempt will be made to present the information in as

AN006021-1

(A) Typical Output Sink

Characteristic (N-Channel)

AN006021-2

(B) Typical Output Source

Characteristic (P-Channel)

FIGURE 1.

AN006021-3

(A) Typical Output Sink

Characteristic (N-Channel)

AN006021-4

(B) Typical Output Source

Characteristic (P-Channel)

FIGURE 2.

AN006021

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