inputs with slow transitioning signals will increase dynamic current consumption of the device. For additional

information regarding Schmitt-trigger inputs, please see Understanding Schmitt Triggers.

8.3.3 Clamp Diode Structure

The inputs and outputs to this device have both positive and negative clamping diodes as depicted in Electrical

Placement of Clamping Diodes for Each Input and Output.

CAUTION

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

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

current ratings are observed.

GND

Logic

Input

Output

Device

Figure 8-2. Electrical Placement of Clamping Diodes for Each Input and Output

8.4 Device Functional Modes

Function Table lists the functional modes of the SN74HCS74.

Table 8-1. Function Table

INPUTS

OUTPUTS

PRE

CLR

CLK

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

(1)

This configuration is nonstable; that is, it does not persist when PRE or CLR returns to its inactive

(high) level.

SN74HCS74

SCLS782B – NOVEMBER 2019 – REVISED NOVEMBER 2020

www.ti.com

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