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SN74AVC2T245RSWR Fiches technique(PDF) 2 Page - Texas Instruments

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No de pièce SN74AVC2T245RSWR
Description  DUAL-BIT DUAL-SUPPLY BUS TRANSCEIVER WITH CONFIGURABLE VOLTAGE TRANSLATION AND 3-STATE OUTPUTS
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
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SN74AVC2T245RSWR Fiches technique(HTML) 2 Page - Texas Instruments

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DESCRIPTION/ORDERING INFORMATION (CONTINUED)
DIR1
A1
OE
B1
SN74AVC2T245
SCES692 – JUNE 2008...................................................................................................................................................................................................... www.ti.com
The SN74AVC2T245 is designed for asynchronous communication between two data buses. The logic levels of
the direction-control (DIR) input and the output-enable (OE) activate either the B-port outputs or the A-port
outputs or place both output ports into the high-impedance mode . The device transmits data from the A bus to
the B bus when the B-port outputs are activated and from the B bus to the A bus when the A-port outputs are
activated. The input circuitry on both A and B ports always is active and must have a logic HIGH or LOW level
applied to prevent excess ICC and ICCZ.
The SN74AVC2T245 is designed so that the control pins (DIR1, DIR2, and OE) are supplied by VCCA.
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 ports are in the high-impedance state.
To ensure the high-impedance state during power up or power down, OE must be connected to VCC through a
pull-up resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
FUNCTION TABLE(1)
(EACH TRANSCEIVER)
CONTROL INPUTS
OUTPUT CIRCUITS
OPERATION
OE
DIR1
A PORT
B PORT
L
L
Enabled
Hi-Z
B data to A data
L
H
Hi-Z
Enabled
A data to B data
H
X
Hi-Z
Hi-Z
Isolation
(1)
Input circuits of the data I/Os are always active.
LOGIC DIAGRAM (POSITIVE LOGIC)(1)
(1)
Shown for a single channel
2
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Copyright © 2008, Texas Instruments Incorporated
Product Folder Link(s): SN74AVC2T245


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