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

Y

H

X

X

L

X

H

X

L

X

X

H

L

L

L

L

H

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CD74HC27, CD54HC27

SCHS132D – AUGUST 1997 – REVISED APRIL 2021

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