Datasheet

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DESCRIPTION/ORDERING INFORMATION (CONTINUED)
1
2 18
1Y1
1OE
1A1
4 16
1Y21A2
6 14
1Y3
1A3
8 12
1Y4
1A4
19
11 9
2Y1
2OE
2A1
13 7
2Y22A2
15 5
2Y3
2A3
17 3
2Y4
2A4
SN74LVC2244A
OCTAL BUFFER/DRIVER
WITH 3-STATE OUTPUTS
SCAS572K – APRIL 1996 – REVISED MARCH 2005
Inputs can be driven from either 3.3-V or 5-V devices. This feature allows the use of this device as a translator in
a mixed 3.3-V/5-V system environment.
This device is fully specified for partial-power-down applications using I
off
. The I
off
circuitry disables the outputs,
preventing damaging current backflow through the device when it is powered down.
To ensure the high-impedance state during power up or power down, OE should be tied to V
CC
through a pullup
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
FUNCTION TABLE
(EACH BUFFER)
INPUTS
OUTPUT
Y
OE A
L H H
L L L
H X Z
LOGIC DIAGRAM (POSITIVE LOGIC)
2