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SN74AHCT245PWR Folha de dados(PDF) 8 Page - Texas Instruments

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Nome de Peças SN74AHCT245PWR
Descrição Electrónicos  SNx4AHCT245 Octal Bus Transceivers With 3-State Outputs
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Fabricante Electrônico  TI1 [Texas Instruments]
Página de início  http://www.ti.com
Logo TI1 - Texas Instruments

SN74AHCT245PWR Folha de dados(HTML) 8 Page - Texas Instruments

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DIR
OE
A1
B1
To Seven Other Channels
1
2
19
18
SN54AHCT245, SN74AHCT245
SCLS233P – OCTOBER 1995 – REVISED JULY 2014
www.ti.com
9 Detailed Description
9.1 Overview
The SNx7ACHT245 octal bus transceivers are designed for asynchronous two-way communication between data
buses. The control-function implementation minimizes external timing requirements. The SNx4AHCT245 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 effectively are 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.
9.2 Functional Block Diagram
Figure 3. Logic Diagram (Positive Logic)
9.3 Feature Description
VCC is optimized at 5 V
Allows up voltage translation from 3.3 V to 5 V
Inputs Accept VIH levels of 2 V
Slow edge rates minimize output ringing
9.4 Device Functional Modes
Table 1. Function Table
(Each Transceiver)
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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