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74AHCT1G125DCKTG4 Datasheet(PDF) 9 Page - Texas Instruments

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Part # 74AHCT1G125DCKTG4
Description  Single Bus Buffer Gate With 3-State Output
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

74AHCT1G125DCKTG4 Datasheet(HTML) 9 Page - Texas Instruments

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1OE
V
GND
A
Y
Regulated 3.3 V
CC
µC or
System Logic
5 V C
System Logic
LEDs
µ
Regulated 5 V
9
SN74AHCT1G125
www.ti.com
SCLS378N – AUGUST 1997 – REVISED JANUARY 2016
Product Folder Links: SN74AHCT1G125
Submit Documentation Feedback
Copyright © 1997–2016, 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 SN74AHCT1G125 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 input switching levels have been lowered to accommodate TTL inputs of 0.8 V
VIL and 2V VIH. This feature makes it Ideal for translating up from 3.3 V to 5 V. Figure 4 shows this type of
translation.
10.2 Typical Application
Figure 4. Typical Application Schematic
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, so 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 50 mA total for the part.
Outputs should not be pulled above VCC.


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