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SN74HCS14 Datasheet(PDF) 9 Page - Texas Instruments

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Part No. SN74HCS14
Description  SN74HCS14 Hex Inverter with Schmitt-Trigger Inputs
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

SN74HCS14 Datasheet(HTML) 9 Page - Texas Instruments

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background image
D-Type
Flip-Flop
Counter
2
0
2
1
2
2
2
3
2
4
Input
Clear
Q
CLR
Q
D
CLR
9
SN74HCS14
www.ti.com
SCLS799 – JANUARY 2020
Product Folder Links: SN74HCS14
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Copyright © 2020, Texas Instruments Incorporated
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 Application Information
The SN74HCS14 can be used to add an additional stage to a counter with an external flip-flop. Because
counters use a negative edge trigger, the flip-flop's clock input must be inverted to provide this function. Having
Schmitt-trigger inputs is important in this application to eliminate any noise issues that could impact the counting
function which could lead to incorrect frequency division. This function only requires one of the six available
inverters in the SN74HCS14 device, so the remaining channels can be used for other applications needing an
inverted signal or improved signal integrity. Unused inputs must be terminated at VCC or GND. Unused outputs
can be left floating.
9.2 Typical Application
Figure 9. Typical application block diagram
9.2.1 Design Requirements
All logic devices shown are operating from the same 5-V supply
Each device must have an individual bypass capacitor as described in
There are no limitations on input edge rates to the SN74HCS14 due to Schmitt-trigger inputs
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 supply must be capable of sourcing current equal to the total current to be sourced by all outputs of the
SN74HCS14 plus the maximum supply current, ICC, listed in the Electrical Characteristics. The logic device can
only source or sink as much current as it is provided at the supply and ground pins, respectively. Be sure not to
exceed the maximum total current through GND or VCC listed in the Absolute Maximum Ratings.
The SN74HCS14 can drive a load with a total capacitance less than or equal to 50 pF connected to a high-
impedance CMOS input while still meeting all of the datasheet specifications. Larger capacitive loads can be
applied, however it is not recommended to exceed 70 pF.
Total power consumption can be calculated using the information provided in CMOS Power Consumption and
Cpd Calculation.
Thermal increase can be calculated using the information provided in Thermal Characteristics of Standard Linear
and Logic (SLL) Packages and Devices.


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