Datasheet

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DESCRIPTION/ORDERING INFORMATION (CONTINUED)
4Y
3Y
2Y
1Y
A/B
OE
4B
4A
3B
3A
2B
2A
1B
1A
4
2
3
7
5
6
9
11
10
12
14
13
1
15
Pin numbers shown are for the D, DB, J, NS, PW, RGY, and W packages.
SN54LVC257A, SN74LVC257A
QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS
WITH 3-STATE OUTPUTS
SCAS294N – JANUARY 1993 – REVISED JUNE 2005
Inputs can be driven from either 3.3-V or 5-V devices. This feature allows the use of these devices as translators
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.
FUNCTION TABLE
INPUTS
OUTPUT
Y
OE A/B A B
H X X X Z
L L L X L
L L H X H
L H X L L
L H X H H
LOGIC DIAGRAM (POSITIVE LOGIC)
2