MC74VHCT257A Datasheet, PDF (2/8 Pages) ON Semiconductor – Quad 2-Channel Multiplexer with 3-State Outputs

NIBBLE
INPUTS
OE
S
2
A0
3
B0
A1 ⁵
B1 ⁶
11
A2
10
B2
A3 ¹⁴
B3 ¹³
15
1
MC74VHCT257A
4 _Y0
7
Y1
9 _Y2
DATA
OUTPUTS
12 _Y3
OE ¹⁵
S1
A0 ²
B0 ³
A1 ⁵
B1 ⁶
A2 ¹¹
B2 ¹⁰
A3 ¹⁴
B3 ¹³
EN
G1
1 ^MUX
1
4
Y0
7
Y1
9
Y2
12
Y3
Figure 2. Expanded Logic Diagram
Figure 3. IEC Logic Symbol
FUNCTION TABLE
Inputs
OE
S
Outputs
Y0 – Y3
H
X
L
L
L
A0–A3
L
H B0–B3
A0 – A3, B0 – B3 = the levels
of the respective Data–Word
Inputs.
This device contains protection
circuitry to guard against damage
due to high static voltages or electric
fields. However, precautions must
be taken to avoid applications of any
voltage higher than maximum rated
voltages to this high–impedance cir-
cuit. For proper operation, V_in and
V_out should be constrained to the
range GND v (V_in or V_out) v V_CC.
Unused inputs must always be
tied to an appropriate logic voltage
level (e.g., either GND or V_CC).
Unused outputs must be left open.
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