7 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, as well as validating and testing their design

implementation to confirm system functionality.

7.1 Power Supply Recommendations

The power supply can be any voltage between the minimum and maximum supply voltage rating in the

Recommended Operating Conditions.

Each VCC pin must have a good bypass capacitor to prevent power disturbance. For devices with a single

supply, 0.1 µF is recommended; if there are multiple VCC pins, then 0.01 µF or 0.022 µF is recommended for

each power pin. It is acceptable to parallel multiple bypass caps to reject different frequencies of noise. A 0.1 µF

and a 1 µF are commonly used in parallel. The bypass capacitor must be installed as close to the power pin as

possible for best results.

7.2 Layout

7.2.1 Layout Guidelines

When using multiple-input and multiple-channel logic devices inputs must not ever be left floating. In many

cases, functions or parts of functions of digital logic devices are unused; for example, when only two inputs of a

triple-input AND gate are used or only 3 of the 4 buffer gates are used. Such unused input pins must not be left

unconnected because the undefined voltages at the outside connections result in undefined operational states.

All unused inputs of digital logic devices must be connected to a logic high or logic low voltage, as defined by the

input voltage specifications, to prevent them from floating. The logic level that must be applied to any particular

unused input depends on the function of the device. Generally, the inputs are tied to GND or VCC, whichever

makes more sense for the logic function or is more convenient.

7.2.2 Layout Example

1

2

3

4

5

6

7

14

13

12

11

10

9

8

1A

1B

2B

2C

2Y

GND

V

CC

1C

1Y

3B

3A

3Y

GND

V

CC

3C

2A

0.1

F

Unused inputs

tied to VCC

Bypass capacitor

placed close to

the device

Avoid 90°

corners for

signal lines

Recommend GND flood fill for

improved signal isolation, noise

reduction, and thermal dissipation

Unused output

left floating

Figure 7-1. Example layout for the SN74LVC10A

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SN74LVC10A

SCAS284P – JANUARY 1993 – REVISED MAY 2024

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