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

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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 regard-
less of all other inputs. The ACT158 is the logic implemen-
tation 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 obvious use is as a
function generator. The ACT158 can generate four func-
tions of two variables with one variable 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.
2
Truth Table
H
L
X
LOW Voltage Level
HIGH Voltage Level
Immaterial
E
H
L
L
L
L
S
X
H
H
L
L
Inputs
I
X
H
X
X
L
0
I
X
X
H
L
X
1
Outputs
H
H
H
Z
L
L