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SN74AVCH4T245 Datasheet(PDF) 2 Page - Texas Instruments

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Part No. SN74AVCH4T245
Description  4-BIT DUAL-SUPPLY BUS TRANSCEIVER WITH CONFIGURABLE VOLTAGE TRANSLATION AND 3-STATE OUTPUTS
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
Logo TI - Texas Instruments

SN74AVCH4T245 Datasheet(HTML) 2 Page - Texas Instruments

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SN74AVCH4T245
4BIT DUALSUPPLY BUS TRANSCEIVER
WITH CONFIGURABLE VOLTAGE TRANSLATION AND 3STATE OUTPUTS
SCES577A – JUNE 2004 – REVISED APRIL 2005
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
description/ordering information (continued)
ORDERING INFORMATION
TA
PACKAGE†
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
QFN − RGY
Tape and reel
SN74AVCH4T245RGYR
WS245
SOIC − D
Tube
SN74AVCH4T245D
AVCH4T245
−40
°C to 85°C
SOIC − D
Tape and reel
SN74AVCH4T245DR
AVCH4T245
−40
°C to 85°C
TSSOP − PW
Tube
SN74AVCH4T245PW
WS245
TSSOP − PW
Tape and reel
SN74AVCH4T245PWR
WS245
TVSOP − DGV
Tape and reel
SN74AVCH4T245DGVR
WS245
† Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines
are available at www.ti.com/sc/package.
The VCC isolation feature ensures that if either VCC input is at GND, then both ports 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 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.
FUNCTION TABLE
(each 4-bit section)
INPUTS
OPERATION
OE
DIR
OPERATION
L
L
B data to A bus
L
H
A data to B bus
H
X
All output Hi-Z
logic diagram (positive logic)
1DIR
1OE
1A1
1B1
2
4
15
13
1A2
1B2
5
12
2DIR
2OE
2A1
2B1
3
6
14
11
2A2
2B2
7
10


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