input signal is required, a device with a Schmitt-trigger input should be used to condition the input signal prior to

the standard CMOS input.

8.3.3 Clamp Diode Structure

The inputs and outputs to this device have both positive and negative clamping diodes as depicted in Figure 8-1.

CAUTION

Voltages beyond the values specified in the Absolute Maximum Ratings table can cause damage to

the device. The recommended input and output voltage ratings may be exceeded if the input and

output clamp-current ratings are observed.

GND

Logic

Input

Output

VCC

Device

-IIK

+IIK

+IOK

-IOK

Figure 8-1. Electrical Placement of Clamping Diodes for Each Input and Output

8.4 Device Functional Modes

Table 8-1. Function Table

INPUTS

OUTPUT

A

B

C

D

E

F

G

H

Y

H

H

H

H

H

H

H

H

L

L

X

X

X

X

X

X

X

H

X

L

X

X

X

X

X

X

H

X

X

L

X

X

X

X

X

H

X

X

X

L

X

X

X

X

H

X

X

X

X

L

X

X

X

H

X

X

X

X

X

L

X

X

H

X

X

X

X

X

X

L

X

H

X

X

X

X

X

X

X

L

H

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CD74HC30, CD54HC30

SCHS121E – AUGUST 1997 – REVISED APRIL 2021

Copyright © 2021 Texas Instruments Incorporated

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