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SN54HC14 Datasheet(PDF) 10 Page - Texas Instruments |
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SN54HC14 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 30 page 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 Submit Documentation Feedback Copyright © 1982–2015, Texas Instruments Incorporated Product Folder Links: SN54HC14 SN74HC14 |
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