MC74VHC139_11 Datasheet, PDF (2/8 Pages) ON Semiconductor – Dual 2-to-4 Decoder/ Demultiplexer

MC74VHC139
ADDRESS
INPUTS
A0a ²
A1a ³
Ea ¹
4 _Y0a
5 _Y1a
6 _Y2a
7 _Y3a
ACTIVE-LOW
OUTPUTS
ADDRESS
INPUTS
A0b ¹⁴
A1b ¹³
12 _Y0b
11 _Y1b
10 _Y2b
9 _Y3b
ACTIVE-LOW
OUTPUTS
Eb ¹⁵
Figure 1. Logic Diagram
Table 1. FUNCTION TABLE
Inputs
Outputs
E
A1 A0 Y0 Y1 Y2 Y3
H
X
X
H
H
H
H
L
L
L
L
H
H
H
L
L
H
H
L
H
H
L
H
L
H
H
L
H
L
H
H
H
H
H
L
En
Y0
Y1
A0
Y2
Y3
A1
Figure 2. Expanded Logic Diagram
(1/2 of Device)
INPUT
Figure 3. Input Equivalent Circuit
A1a ³
A0a 2
Ea 1
A1b 13
A0b 14
Eb 15
X/Y
1
0
2
1
EN
2
3
4 Y0a
5 Y1a
6 Y2a
7 _Y3a
12 Y0b
11 Y1b
10 Y2b
9 Y3b
A1a ³
A0a 2
Ea 1
A1b 13
A0b 14
Eb 15
DMUX
0
1
G
0
3
0
1
2
3
4 Y0a
5 Y1a
6 Y2a
7 _Y3a
12 Y0b
11 Y1b
10 Y2b
9 Y3b
Figure 4. IEC Logic Diagram
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