HD74AC153 Datasheet, PDF (2/7 Pages) Hitachi Semiconductor – Dual 4-Input Multiplexer

HD74AC153
Logic Symbol
Ea I0a I1a I2a I3a I0b I1b I2b I3b Eb
S0
S1
Za
Zb
Pin Names
I_0a to I_3a
I_0b to I_3b
S₀, S₁
E_a
E_b
Z_a
Z_b
Side A Data Inputs
Side B Data Inputs
Common Select Inputs
Side A Enable Input
Side B Enable Input
Side A Output
Side B Output
Functional Description
The HD74AC153 is a dual 4-input multiplexer. It can select two bits of data from up to four sources under the control
of the common Select inputs (S₀, S₁). The two 4-input multiplexer circuits have individual active-Low Enables (E_a, E_b)
which can be used to strobe the outputs independently. When the Enables (E_a, E_b) are High, the corresponding outputs
(Z_a, Z_b) are forced Low. The HD74AC153 is the logic implementation of a 2-pole, 4-position switch, where the
position of the switch is determined by the logic levels supplied to the two Select inputs. The logic equations for the
outputs are shown below.
Z_a = E_a•(I_0a•S₁•S₀ + I_1a•S₁•S₀ + I_2a•S₁•S₀ + I_3a•S₁•S₀)
Z_b = E_b•(I_0b•S₁•S₀ + I_1b•S₁•S₀ + I_2b•S₁•S₀ + I_3b•S₁•S₀)
Truth Table
Select Inputs
S₀
X
S₁
X
E
H
L
L
L
L
L
L
H
L
L
H
L
L
L
H
L
L
H
L
H
H
L
H
H
L
H : High Voltage Level
L : Low Voltage Level
X : Immaterial
I₀
X
L
H
X
X
X
X
X
X
Input (a or b)
I₁
X
I₂
X
X
X
X
X
L
X
H
X
X
L
X
H
X
X
X
X
I₃
X
X
X
X
X
X
X
L
H
Output
Z
L
L
H
L
H
L
H
L
H
Rev.2.00, Jul.16.2004, page 2 of 6