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SN74AVC2T45DCUTG4 数据表(PDF) 2 Page - Texas Instruments

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部件名 SN74AVC2T45DCUTG4
功能描述  DUAL-BIT DUALSUPPLY BUS TRANSCEIVER WITH CONFIGURABLE VOLTAGE TRANSLATION AND 3-STATE OUTPUTS
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制造商  TI [Texas Instruments]
网页  http://www.ti.com
标志 TI - Texas Instruments

SN74AVC2T45DCUTG4 数据表(HTML) 2 Page - Texas Instruments

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DESCRIPTION/ORDERING INFORMATION (CONTINUED)
B1
DIR
5
7
A1
2
VCCA
VCCB
B2
6
A2
3
SN74AVC2T45
DUAL-BIT DUAL-SUPPLY BUS TRANSCEIVER
WITH CONFIGURABLE VOLTAGE TRANSLATION AND 3-STATE OUTPUTS
SCES531J – DECEMBER 2003 – REVISED JUNE 2007
The SN74AVC2T45 is designed for asynchronous communication between two data buses. The logic levels of
the direction-control (DIR) input activate either the B-port outputs or the A-port outputs. 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 SN74AVC2T45 is designed so that the DIR input is powered 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.
NanoFree™ package technology is a major breakthrough in IC packaging concepts, using the die as the
package.
FUNCTION TABLE(1)
(EACH TRANSCEIVER)
INPUT
OPERATION
DIR
L
B data to A bus
H
A data to B bus
(1)
Input circuits of the data I/Os always are active.
LOGIC DIAGRAM (POSITIVE LOGIC)(1)
(1)
Pin numbers are for the DCT and DCU packages only.
2
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