GND

Logic

Input

Output

VCC

Device

-IIK

+IIK

+IOK

-IOK

9

SN74HC74-Q1

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SCLS577B – MARCH 2004 – REVISED APRIL 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 recommended input 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

(1)

This configuration is nonstable;

that is, it does not persist when

PRE or CLR returns to its inactive

(high) level.

Table 1. Function Table

INPUTS

OUTPUT

S

PRE

CLR

CL

K

D

Q

Q

L

H

X

X

H

L

H

L

X

X

L

H

L

L

X

X

H(1)

H(1)

H

H

↑

H

H

L

H

H

↑

L

L

H

H

H

L

X

Q0

Q0