7.3.5 Clamp Diode Structure

The open-drain outputs to this device have negative clamping diodes only as depicted in Figure 7-3, and the

push-pull outputs to this device have both positive and negative clamping diodes as depicted in Figure 7-4. The

inputs to this device have both positive and negative clamping diodes as depicted in both previously referenced

figures.

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.

Figure 7-3. Electrical Placement of Clamping

Diodes for Each Input and Open-Drain Output

GND

Logic

Input

Output

VCC

Device

-IIK

+IIK

+IOK

-IOK

Figure 7-4. Electrical Placement of Clamping

Diodes for Each Input and Push-Pull Output

7.4 Device Functional Modes

Table 7-1 lists the functional modes of the SN74ACT596-Q1. Outputs QA – QH are open-drain. Open-drain

outputs drive low when in the low (L) state, and enter the high-impedance (Z) state when set to the high (H)

state.

Table 7-1. Function Table

INPUTS

FUNCTION

SER

SRCLK

SRCLR

RCLK

OE

X

X

X

X

H

Outputs QA – QH are disabled

X

X

X

X

L

Outputs QA – QH are enabled.

X

X

L

X

X

Shift register is cleared.

L

↑

H

X

X

First stage of the shift register goes low.

Other stages store the data of previous stage,

respectively.

H

↑

H

X

X

First stage of the shift register goes high.

Other stages store the data of previous stage,

respectively.

X

X

H

↑

X

Shift-register data is stored in the storage register.

X

↑

H

↑

X

Data in shift register is stored in the storage

register, the data is then shifted through.

www.ti.com

SN74ACT596-Q1

SCASE34 – NOVEMBER 2024

Copyright © 2024 Texas Instruments Incorporated

Submit Document Feedback

11

Product Folder Links: SN74ACT596-Q1