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SN54HC14 Datasheet(PDF) 10 Page - Texas Instruments

Part # SN54HC14
Description  SNx4HC14 Hex Schmitt-Trigger Inverters
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

SN54HC14 Datasheet(HTML) 10 Page - Texas Instruments

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1A
1Y
C1
R1
2A
2Y
INPUT
OUTPUT
SN54HC14, SN74HC14
SCLS085H – DECEMBER 1982 – REVISED SEPTEMBER 2015
www.ti.com
10 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.
10.1 Application Information
The SNx4HC14 device is a Schmitt-trigger input CMOS device that can be used for a multitude of inverting buffer
type functions. The application shown here takes advantage of the Schmitt-trigger inputs to produce a delay for a
logic output.
10.2 Typical Application
Figure 5. Simplified Application Schematic
10.2.1 Design Requirements
This device uses CMOS technology. Take care to avoid bus contention because it can drive currents that would
exceed maximum limits. Parallel output drive can create fast edges into light loads so consider routing and load
conditions to prevent ringing.
10.2.2 Detailed Design Procedure
This circuit is designed around an RC network that produces a slow input to the second inverter. The RC time
constant,
τ, is calculated from: τ = R×C
The delay time for this circuit will be between 1.2
τ and 0.42τ. It should be noted that the delay will be consistent
for each device, but since the switching threshold is only guaranteed between a minimum and maximum value,
the output pulse length will vary between devices. These values were calculated by using the minimum and
maximum guaranteed VT+ values.
The resistor value should be chosen such that the maximum current from/to the SNx4HC14 is 4 mA.
Recommended input conditions:
Schmitt-trigger inputs allow for slow inputs.
Specified high and low levels. See (VIH and VIL) in Recommended Operating Conditions.
Recommended output conditions:
Load currents should not exceed 4 mA per output.
10
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Copyright © 1982–2015, Texas Instruments Incorporated
Product Folder Links: SN54HC14 SN74HC14


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