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74ACT158 Quad 2-Input Multiplexer
April 2007
74ACT158
Quad 2-Input Multiplexer
Features
■
I
CC
reduced by 50%
■
Outputs source/sink 24mA
■
TTL-compatible inputs
tm
General Description
The ACT158 is a high-speed quad 2-input multiplexer. It
selects four bits of data from two sources using the com-
mon Select and Enable inputs. The four buffered outputs
present the selected data in the inverted form. The
ACT158 can also be used as a function generator.
Ordering Information
Order
Number
74ACT158SC
74ACT158SJ
74ACT158MTC
Package
Number
M16A
M16D
MTC16
Package Description
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow
16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153,
4.4mm Wide
Device also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering number.
Pb-Free package per JEDEC J-STD-020B.
Connection Diagram
Logic Symbols
IEE/IEC
Pin Description
Pin Names
I
0a
–I
0d
I
1a
–I
1d
E
S
Z
a
–Z
d
Description
Source 0 Data Inputs
Source 1 Data Inputs
Enable Input
Select Input
Inverted Outputs
FACT™ is a trademark of Fairchild Semiconductor Corporation.
©1988 Fairchild Semiconductor Corporation
74ACT158 Rev. 1.4
www.fairchildsemi.com
74ACT158 Quad 2-Input Multiplexer
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.
Truth Table
Inputs
E
H
L
L
L
L
Outputs
I
1
X
X
X
L
H
S
X
L
L
H
H
I
0
X
L
H
X
X
Z
H
H
L
H
L
H
=
HIGH Voltage Level
L
=
LOW Voltage Level
X
=
Immaterial
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.
©1988 Fairchild Semiconductor Corporation
74ACT158 Rev. 1.4
www.fairchildsemi.com
2
74ACT158 Quad 2-Input Multiplexer
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be
operable above the recommended operating conditions and stressing the parts to these levels is not recommended.
In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability.
The absolute maximum ratings are stress ratings only.
Symbol
V
CC
I
IK
Supply Voltage
DC Input Diode Current
V
I
=
–0.5V
V
I
=
V
CC
+ 0.5V
V
I
I
OK
DC Input Voltage
DC Output Diode Current
V
O
=
–0.5V
V
O
=
V
CC
+ 0.5V
V
O
I
O
DC Output Voltage
Parameter
Rating
–0.5V to +7.0V
–20mA
+20mA
–0.5V to V
CC
+ 0.5V
–20mA
+20mA
–0.5V to V
CC
+ 0.5V
±50mA
±50mA
–65°C to +150°C
140°C
DC Output Source or Sink Current
I
CC
or I
GND
DC V
CC
or Ground Current per Output Pin
T
STG
Storage Temperature
T
J
Junction Temperature
Recommended Operating Conditions
The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended
operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not
recommend exceeding them or designing to absolute maximum ratings.
Symbol
V
CC
V
I
V
O
T
A
∆
V /
∆
t
Supply Voltage
Input Voltage
Output Voltage
Operating Temperature
Minimum Input Edge Rate,
Parameter
Rating
4.5V to 5.5V
0V to V
CC
0V to V
CC
–40°C to +85°C
125mV/ns
V
IN
from 0.8V to 2.0V, V
CC
@ 4.5V, 5.5V
©1988 Fairchild Semiconductor Corporation
74ACT158 Rev. 1.4
www.fairchildsemi.com
3
74ACT158 Quad 2-Input Multiplexer
DC Electrical Characteristics
Symbol
V
IH
V
IL
V
OH
Parameter
Minimum HIGH Level
Input Voltage
Maximum LOW Level
Input Voltage
Minimum HIGH Level
Output Voltage
V
CC
(V)
4.5
5.5
4.5
5.5
4.5
5.5
T
A
=
+25°C
Conditions
V
OUT
=
0.1V
or V
CC
– 0.1V
V
OUT
=
0.1V
or V
CC
– 0.1V
I
OUT
=
–50µA
V
IN
=
V
IL
or V
IH
:
T
A
=
–40°C to +85°C
Units
V
V
V
2.0
2.0
0.8
0.8
4.4
5.4
3.76
4.76
0.1
0.1
0.44
0.44
±1.0
1.5
75
–75
µA
mA
mA
mA
µA
V
Typ.
1.5
1.5
1.5
1.5
4.49
5.49
2.0
2.0
0.8
0.8
4.4
5.4
Guaranteed Limits
4.5
5.5
V
OL
Maximum LOW Level
Output Voltage
4.5
5.5
I
OH
=
–24mA
I
OH
=
–24mA
(1)
I
OUT
=
50µA
V
IN
=
V
IL
or V
IH
:
0.001
0.001
I
OL
=
24mA
I
OL
=
24mA
(1)
V
I
=
V
CC
, GND
V
I
=
V
CC
– 2.1V
V
OLD
=
1.65V Max.
V
OHD
=
3.85V Min.
V
IN
=
V
CC
or GND
0.6
3.86
4.86
0.1
0.1
0.36
0.36
±0.1
4.5
5.5
I
IN
I
CCT
I
OLD
I
OHD
I
CC
Maximum Input
Leakage Current
Maximum I
CC
/Input
Minimum Dynamic
Output Current
(2)
Maximum Quiescent
Supply Current
5.5
5.5
5.5
5.5
5.5
4.0
40.0
Notes:
1. All outputs loaded; thresholds on input associated with output under test.
2. Maximum test duration 2.0ms, one output loaded at a time.
©1988 Fairchild Semiconductor Corporation
74ACT158 Rev. 1.4
www.fairchildsemi.com
4
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