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74AVCH8T245DGVRE4 Fiches technique(PDF) 2 Page - Texas Instruments

No de pièce 74AVCH8T245DGVRE4
Description  8-BIT DUAL-SUPPLY BUS TRANSCEIVER WITH CONFIGURABLE VILTAGE TRANSLATION AND 3-STATE OUTPUTS
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

74AVCH8T245DGVRE4 Fiches technique(HTML) 2 Page - Texas Instruments

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SN74AVCH8T245
8BIT DUALSUPPLY BUS TRANSCEIVER
WITH CONFIGURABLE VOLTAGE TRANSLATION AND 3STATE OUTPUTS
SCES565F − APRIL 2004 − REVISED APRIL 2005
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
description/ordering information (continued)
The SN74AVCH8T245 is designed for asynchronous communication between data buses. The device
transmits data 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 outputs so the buses are
effectively isolated.
The SN74AVCH8T245 is designed so the control pins (DIR and OE) are supplied by VCCA.
The SN74AVCH8T245 solution is compatible with a single-supply system and can be replaced later with a ’245
function, with minimal printed circuit board redesign.
This device is fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the outputs,
preventing damaging current backflow through the device when it is powered down.
The VCC isolation feature ensures that if either VCC input is at GND, both outputs are in the high-impedance
state. The bus-hold circuitry on the powered-up side always stays active.
Active bus-hold circuitry holds unused or undriven inputs at a valid logic state. Use of pullup or pulldown resistors
with the bus-hold circuitry is not recommended.
To ensure the high-impedance state during power up or power down, OE shall be tied to VCC through a pullup
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
FUNCTION TABLE
(each 8-bit section)
INPUTS
OPERATION
OE
DIR
OPERATION
L
L
B data to A bus
L
H
A data to B bus
H
X
All outputs Hi-Z
logic diagram (positive logic)
DIR
OE
A1
B1
To Seven Other Channels
2
3
22
21


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