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SN74AHC245PWLE Datenblatt(PDF) 11 Page - Texas Instruments

Teilenummer SN74AHC245PWLE
Bauteilbeschribung  SNx4AHC245 Octal Bus Transceivers With 3-State Outputs
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Hersteller  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
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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
or other system
boards
5 V LEDs, Relays,
or other system boards
OE
V
GND
A1
A8
B1
B8
Regulated 5 V or 3.3 V
µC
CC
DIR
5 V LEDs, Relays,
or other system
boards
µC
SN54AHC245, SN74AHC245
www.ti.com
SCLS230J – OCTOBER 1995 – REVISED JULY 2014
10 Application and Implementation
10.1 Application Information
The SNx4AHC245A 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 can accept voltages to 5.5 V at any valid VCC making it ideal for down
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. Outputs can be combined to
produce higher drive but the high drive will also create faster 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
Rise time and fall time specs: See (
Δt/ΔV) 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.
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.
Copyright © 1995–2014, Texas Instruments Incorporated
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Product Folder Links: SN54AHC245 SN74AHC245


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