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74AVCH2T45DCTRE4 データシート(PDF) 2 Page - Texas Instruments

部品番号 74AVCH2T45DCTRE4
部品情報  DUAL-BIT DUAL-SUPPLY BUS TRANSCEIVER WITH CONFIGURABLE VOLTAGE TRANSLATION AND 3-STATE OUTPUTS
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DESCRIPTION/ORDERING INFORMATION (CONTINUED)
B1
DIR
5
7
A1
2
VCCA
VCCB
B2
6
A2
3
SN74AVCH2T45
DUAL-BIT DUAL-SUPPLY BUS TRANSCEIVER
WITH CONFIGURABLE VOLTAGE TRANSLATION AND 3-STATE OUTPUTS
SCES582F – JULY 2004 – REVISED NOVEMBER 2007
The SN74AVCH2T45 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 SN74AVCH2T45 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, then 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.
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 shown are for the DCT and DCU packages.
2
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Copyright © 2004–2007, Texas Instruments Incorporated
Product Folder Link(s): SN74AVCH2T45


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