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SN74AHCT240NSR Fiches technique(PDF) 9 Page - Texas Instruments

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No de pièce SN74AHCT240NSR
Description  SNx4AHCT240 Octal Buffers/Drivers With 3-State Outputs
Download  28 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

SN74AHCT240NSR Fiches technique(HTML) 9 Page - Texas Instruments

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C or System
Logic
SNx4AHCT240
A1
A4
OE
Y1
Y2
VCC
GND
C/System
Logic/LEDs
5 V
3.3 V
9
SN54AHCT240, SN74AHCT240
www.ti.com
SCLS252M – OCTOBER 1995 – REVISED APRIL 2016
Product Folder Links: SN54AHCT240 SN74AHCT240
Submit Documentation Feedback
Copyright © 1995–2016, Texas Instruments Incorporated
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 SNx4AHCT240 is a low-drive CMOS device that may 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 input switching levels have been lowered to accommodate TTL inputs of 0.8-V
VIL and 2-V VIH. This feature makes the SNx4AHCT240 device ideal for translating up from 3.3 V to 5 V. Figure 3
shows this type of translation.
10.2 Typical Application
Figure 3. Application Diagram
10.2.1 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; therefore, routing and load conditions should be considered to prevent ringing.
10.2.2 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. Recommend 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.


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