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SN74HC245DWG4 Fiches technique(PDF) 8 Page - Texas Instruments

No de pièce SN74HC245DWG4
Description  Octal Bus Transceivers
Download  28 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
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SN74HC245DWG4 Fiches technique(HTML) 8 Page - Texas Instruments

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DIR
OE
A1
B1
1
2
18
19
To Seven Other Channels
SN54HC245, SN74HC245
SCLS131E – DECEMBER 1982 – REVISED SEPTEMBER 2015
www.ti.com
8 Detailed Description
8.1 Overview
These octal bus transceivers are designed for asynchronous two-way communication between data buses. The
control-function implementation minimizes external timing requirements. The SNx4HC245 devices allow data
transmission from the A bus to the B bus or from the B bus to the A bus, depending on the logic level at the
direction-control (DIR) input. The output-enable (OE) input can be used to disable the device so that the buses
are effectively isolated. To ensure the high-impedance state during power up or power down, OE should be tied
to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking
capability of the driver.
8.2 Functional Block Diagram
Logic Diagram (Positive Logic)
8.3 Feature Description
The SNx4HC245 devices have a wide operating VCC range from 2 V to 6 V with slower edge rates to minimize
output ringing.
8.4 Device Functional Modes
Table 1 lists the function modes of the SNx4HC245.
Table 1. Function Table
INPUTS
OPERATION
OE
DIR
L
L
B data to A bus
L
H
A data to B bus
H
X
Isolation
8
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Copyright © 1982–2015, Texas Instruments Incorporated
Product Folder Links: SN54HC245 SN74HC245


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