9 Application and Implementation

Note

Information in the following applications sections is not part of the TI component specification, and TI

does not warrant its accuracy or completeness. TI’s customers are responsible for determining

suitability of components for their purposes. Customers should validate and test their design

implementation to confirm system functionality.

9.1 Reference

The SN74HCS16507-Q1 is a parallel-input shift register, which can be used to reduce the number of required

inputs on a system controller very significantly in some applications. Parallel data is loaded into the shift register,

then the stored data can be loaded into a serial input of the system controller by clocking the shift register.

Multiple shift registers can be cascaded to provide more data inputs while still only using a single serial input to

the system controller. This process is primarily limited by the required data input rate and timing characteristics

of the selected shift register, as defined in the Timing Charactestics and Switching Charactestics tables.

An example block diagram is shown for using a single shift register in the Typical application block diagram

below.

9.2 Typical Application

System

Controller

SER

CLK INH

SH/LD

8-Bit Shift Register

A B C D E F G H

Data Loading Gates

CLK

Control

Logic

QH

QH

Peripheral

DATA[7:0]

VCC

10 k

Figure 9-1. Typical application block diagram

9.2.1 Design Requirements

9.2.1.1 Power Considerations

Ensure the desired supply voltage is within the range specified in the Recommended Operating Conditions. The

supply voltage sets the device's electrical characteristics as described in the Electrical Characteristics.

The positive voltage supply must be capable of sourcing current equal to the maximum static supply current, ICC,

listed in Electrical Characteristics and any transient current required for switching.

The ground must be capable of sinking current equal to the total current to be sunk by all outputs of the

SN74HCS16507-Q1 plus the maximum supply current, ICC, listed in Electrical Characteristics, and any transient

current required for switching. The logic device can only sink as much current as can be sunk into its ground

connection. Be sure not to exceed the maximum total current through GND listed in the Absolute Maximum

Ratings.

The SN74HCS16507-Q1 can drive a load with a total capacitance less than or equal to 50 pF while still meeting

all of the datasheet specifications. Larger capacitive loads can be applied, however it is not recommended to

exceed 50 pF.

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SN74HCS16507-Q1

SCLS824 – AUGUST 2020

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