Vcc

Unused Input

Input

Output

Input

Unused Input

Output

17

SN5414, SN54LS14, SN7414, SN74LS14

www.ti.com

SDLS049C – DECEMBER 1983 – REVISED NOVEMBER 2016

Product Folder Links: SN5414 SN54LS14 SN7414 SN74LS14

Submit Documentation Feedback

Copyright © 1983–2016, Texas Instruments Incorporated

10 Power Supply Recommendations

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

Recommended Operating Conditions. The VCC terminal must have a good bypass capacitor to prevent power

disturbance. TI recommends using a 0.1-µF capacitor on the VCC terminal, and must be placed as close as

possible to the pin for best results.

11 Layout

11.1 Layout Guidelines

When using multiple bit logic devices, inputs must never float. 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

three of the four buffer gates are used. Such inputs 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 high or low bias 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 they are tied to GND or

VCC, whichever makes more sense or is more convenient. Floating outputs are generally acceptable, unless the

part is a transceiver.

11.2 Layout Example

Figure 35. Layout Diagram