8.2.5 Wettable Flanks

This device includes wettable flanks for at least one package. See the Features section on the front page of the

data sheet for which packages include this feature.

Package

We able Flank Lead

PCB

Pad

Standard Lead

Package

Solder

Figure 8-3. Simplified Cutaway View of Wettable-Flank QFN Package and Standard QFN Package After

Soldering

Wettable flanks help improve side wetting after soldering which makes QFN packages easier to inspect with

automatic optical inspection (AOI). A wettable flank can be dimpled or step-cut to provide additional surface

area for solder adhesion which assists in reliably creating a side fillet as shown in Figure 8-3. Please see the

mechanical drawing for additional details.

8.3 Device Functional Modes

Function Table lists the functional modes of the SN74HCS595-Q1.

Table 8-1. Function Table

INPUTS

FUNCTION

SER

SRCLK

SRCLR

RCLK

OE

X

X

X

X

H

X

X

X

X

L

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.

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SN74HCS595-Q1

SCLS785F – DECEMBER 2019 – REVISED DECEMBER 2021

Copyright © 2021 Texas Instruments Incorporated

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