GND

Logic

Input

Output

Device

9

SN74HCS20

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SCLS791A – MARCH 2020 – REVISED JUNE 2020

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Feature Description (continued)

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.

CAUTION

Voltages beyond the values specified in the Absolute Maximum Ratings table can

cause damage to the device. The input negative-voltage and output voltage ratings

may be exceeded if the input and output clamp-current ratings are observed.

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

8.4 Device Functional Modes

Table 1. Function Table

INPUTS

OUTPUT

Y

A

B

C

D

H

H

H

H

L

L

X

X

X

H

X

L

X

X

H

X

X

L

X

H

X

X

X

L

H