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SN74AHCT245PWRG3 Arkusz danych(PDF) 9 Page - Texas Instruments

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Numer części SN74AHCT245PWRG3
Szczegółowy opis  SNx4AHCT245 Octal Bus Transceivers With 3-State Outputs
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5 V LEDs, Relays,
or other system boards
OE
V
GND
A1
A8
B1
B8
Regulated 5 V
3.3 V µC
CC
DIR
SN54AHCT245, SN74AHCT245
www.ti.com
SCLS233P – OCTOBER 1995 – REVISED JULY 2014
10 Application and Implementation
10.1 Application Information
The SN74AHCT245 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 2 V VIH. This feature makes it ideal for translating up from 3.3 V to 5 V. The figure below shows this type
of translation.
10.2 Typical Application
Figure 4. Typical 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 so routing and load conditions should be considered to prevent ringing.
10.2.2 Detailed Design Procedure
Recommended input conditions
Specified high and low levels. See (VIH and VIL) in the Recommended Operating Conditions table.
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
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
Copyright © 1995–2014, Texas Instruments Incorporated
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