SN74LVC244A_10 Datasheet, PDF (2/23 Pages) Texas Instruments – OCTAL BUFFER/DRIVER WITH 3-STATE OUTPUTS

SN74LVC244A
OCTAL BUFFER/DRIVER
WITH 3-STATE OUTPUTS
SCAS414X – NOVEMBER 1992 – REVISED MARCH 2005
www.ti.com
DESCRIPTION/ORDERING INFORMATION (CONTINUED)
The SN74LVC244A is organized as two 4-bit line drivers with separate output-enable (OE) inputs. When OE is
low, the device passes data from the A inputs to the Y outputs. When OE is high, the outputs are in the
high-impedance state.
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.
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.
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.
GQN OR ZQN PACKAGE
(TOP VIEW)
1234
A
B
C
D
E
TERMINAL ASSIGNMENTS
1
2
3
4
A
1A1
1OE
V_CC
2OE
B
1A2
2A4
2Y4
1Y1
C
1A3
2Y3
2A3
1Y2
D
1A4
2A2
2Y2
1Y3
E
GND
2Y1
2A1
1Y4
FUNCTION TABLE
(EACH BUFFER)
INPUTS
OE
A
L
H
L
L
H
X
OUTPUT
Y
H
L
Z
2