74ACT158SC Fairchild Semiconductor, 74ACT158SC Datasheet - Page 2

• Manufacturer Part Number: 74ACT158SC
• Description: IC MULTIPLEXER QUAD 2INP 16-SOIC
• Manufacturer: Fairchild Semiconductor
• Series: 74ACTr
• Type: Multiplexerr

Specifications of 74ACT158SC

• Circuit: 4 x 2:1
• Independent Circuits: 1
• Current - Output High, Low: 24mA, 24mA
• Voltage Supply Source: Single Supply
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

©1988 Fairchild Semiconductor Corporation
74ACT158 Rev. 1.4
Functional Description
The ACT158 quad 2-input multiplexer selects four bits of
data from two sources under the control of a common
Select input (S) and presents the data in inverted form at
the four outputs. The Enable input (E) is active-LOW.
When E is HIGH, all of the outputs (Z) are forced HIGH
regardless of all other inputs. The ACT158 is the logic
implementation of a 4-pole, 2-position switch where the
position of the switch is determined by the logic levels
supplied to the Select input.
A common use of the ACT158 is the moving of data from
two groups of registers to four common output busses.
The particular register from which the data comes is
determined by the state of the Select input. A less obvi-
ous use is as a function generator. The ACT158 can
generate four functions of two variables with one vari-
able common. This is useful for implementing gating
functions.
Logic Diagram
Please note that this diagram is provided only for the understanding of logic operations and should not be used to
estimate propagation delays.
Figure 1.
2
Truth Table
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
E
H
L
L
L
L
S
H
H
X
L
L
Inputs
I
H
X
L
X
X
0
I
H
X
X
L
X
1
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Outputs
Z
H
H
H
L
L