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SN74HC00DBR 数据表(PDF) 10 Page - Texas Instruments

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部件名 SN74HC00DBR
功能描述  SNx4HC00 Quadruple 2-Input Positive-NAND Gates
Download  28 Pages
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

SN74HC00DBR 数据表(HTML) 10 Page - Texas Instruments

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Vcc
Unused Input
Input
Output
Input
Unused Input
Output
10
SN54HC00, SN74HC00
SCLS181F – DECEMBER 1982 – REVISED JULY 2016
www.ti.com
Product Folder Links: SN54HC00 SN74HC00
Submit Documentation Feedback
Copyright © 1982–2016, Texas Instruments Incorporated
10 Power Supply Recommendations
The power supply can be any voltage between the MIN and MAX supply voltage rating located in Recommended
Operating Conditions.
Each VCC pin must have a good bypass capacitor to prevent power disturbance. For devices with a single supply,
TI recommends a 0.1-µF bypass capacitor; if there are multiple VCC pins, then TI recommends 0.01-µF or
0.022-µF bypass capacitors for each power pin. It is acceptable to parallel multiple bypass capacitors 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.
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 3 of the 4 buffer gates are used. Such input pins must not be left
unconnected because the undefined voltages at the outside connections result in undefined operational states.
Figure 5 specifies the rules that must be observed under all circumstances. 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. It is generally acceptable to float outputs, unless the
part is a transceiver.
11.2 Layout Example
Figure 5. Layout Diagram


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