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SN74AHC540DWR データシート(PDF) 10 Page - Texas Instruments

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部品番号 SN74AHC540DWR
部品情報  Octal Buffers/Drivers
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メーカー  TI1 [Texas Instruments]
ホームページ  http://www.ti.com
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SN74AHC540DWR データシート(HTML) 10 Page - Texas Instruments

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OE
V
GND
A1
A8
Y1
Y8
Regulated 5.0 V
CC
µC or
5-V µC
System logic
LEDs
System Logic
SN54AHC540, SN74AHC540
SCLS260L – DECEMBER 1995 – REVISED OCTOBER 2015
www.ti.com
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 SN74AHC540 is a low drive CMOS device that can be used for a multitude of bus interface type applications
where output ringing is a concern. The low drive and slow edge rates will minimize overshoot and undershoot on
the outputs. The inputs accept voltages up to 5.5 V, which allows down translation to the VCC level. Figure 5
shows how the slower edges can reduce ringing on the output compared to higher drive parts like AC.
9.2 Typical Application
Figure 4. Typical Application Schematic
9.2.1 Design Requirements
This device uses CMOS technology and has balanced output drive. Care should be taken to avoid bus
contention because it can drive currents that would exceed maximum limits. The high drive will also create fast
edges into light loads so routing and load conditions should be considered to prevent ringing.
9.2.2 Detailed Design Procedure
1. Recommended Input Conditions:
For rise time and fall time specifications, see
Δt/ΔV in the Recommended Operating Conditions table.
For specified high and low levels, see VIH and VIL in the Recommended Operating Conditions table.
Inputs are overvoltage tolerant allowing them to go as high as 5.5 V at any valid VCC.
2. Recommended Output Conditions:
Load currents should not exceed 25 mA per output and 75 mA total for the part.
Outputs should not be pulled above VCC.
10
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Copyright © 1995–2015, Texas Instruments Incorporated
Product Folder Links: SN54AHC540 SN74AHC540


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