74LCX257 Datasheet, PDF (2/13 Pages) Fairchild Semiconductor – Low Voltage Quad 2-Input Multiplexer with 5V Tolerant Inputs and Outputs

74LCX257
Figure 2: Input And Output Equivalent Circuit
Table 2: Pin Description
PIN N°
1
2, 5, 11, 14
3, 6, 10, 13
4, 7, 9, 12
15
8
16
Table 3: Truth Table
SYMBOL
SELECT
1A to 4A
1B to 4B
1Y to 4Y
OE
GND
V_CC
OE
H
L
L
L
L
X : Don’t Care
Z : High Impedance
INPUTS
SELECT
A
X
X
L
L
L
H
H
X
H
X
NAME AND FUNCTION
Common Data Select Inputs
Data Inputs From Source A
Data Inputs From Source B
3 State Multiplexer Outputs
3 State Output Enable Inputs (Active LOW)
Ground (0V)
Positive Supply Voltage
OUTPUT
B
Y
X
Z
X
L
X
H
L
L
H
H
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