74ACT258 Quad 2-Input Multiplexer with 3-STATE Outputs
April 2007
74ACT258
Quad 2-Input Multiplexer with 3-STATE Outputs
Features
■
I
CC
and I
OZ
reduced by 50%
■
Multiplexer expansion by tying outputs together
■
Inverting 3-STATE outputs
■
Outputs source/sink 24mA
■
TTL-compatible inputs
tm
General Description
The ACT258 is a quad 2-input multiplexer with 3-STATE
outputs. Four bits of data from two sources can be
selected using a common data select input. The four out-
puts present the selected data in the complement
(inverted) form. The outputs may be switched to a high
impedance state with a HIGH on the common Output
Enable (OE) input, allowing the outputs to interface
directly with bus-oriented systems.
Ordering Information
Order
Number
74ACT258SC
74ACT258SJ
74ACT258MTC
Package
Number
M16A
M16D
MTC16
Package Description
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012,
0.150” Narrow Body
16-Lead Small Outline Package (SOP), EIAJ TYPE 11, 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.
Connection Diagram
Pin Description
Pin Names
S
OE
I
0a
–I
0d
I
1a
–I
1d
Z
a
–Z
d
Description
Common Data Select Input
3-STATE Output Enable Input
Data Inputs from Source 0
Data Inputs from Source 1
3-STATE Inverting Data Outputs
FACT™ is a trademark of Fairchild Semiconductor Corporation.
©1988 Fairchild Semiconductor Corporation
74ACT258 Rev. 1.4
www.fairchildsemi.com
74ACT258 Quad 2-Input Multiplexer with 3-STATE Outputs
Logic Symbol
Functional Description
The ACT258 is a quad 2-input multiplexer with 3-STATE
outputs. It selects four bits of data from two sources
under control of a common Select input (S). When the
Select input is LOW, the I
0x
inputs are selected and
when Select is HIGH, the I
1x
inputs are selected. The
data on the selected inputs appears at the outputs in
inverted form. The ACT258 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. The logic equations for the outputs are
shown below:
IEEE/IEC
Z
a
=
OE • (I
1a
• S + I
0a
• S)
Z
b
=
OE • (I
1b
• S + I
0b
• S)
Z
c
=
OE • (I
1c
• S + I
0c
• S)
Z
d
=
OE • (I
1d
• S + I
0d
• S)
When the Output Enable input (OE) is HIGH, the outputs
are forced to a high impedance state. If the outputs of
the 3-STATE devices are tied together, all but one
device must be in the high impedance state to avoid high
currents that would exceed the maximum ratings.
Designers should ensure that Output Enable signals to
3-STATE devices whose outputs are tied together are
designed so there is no overlap.
Truth Table
Output
Enable
OE
H
L
L
Select
Input
S
X
H
H
Data
Inputs
I
0
X
X
X
Outputs
Z
Z
H
L
I
1
X
L
H
H
=
HIGH Voltage Level
L
=
LOW Voltage Level
X
=
Immaterial
Z
=
High Impedance
©1988 Fairchild Semiconductor Corporation
74ACT258 Rev. 1.4
www.fairchildsemi.com
2
74ACT258 Quad 2-Input Multiplexer with 3-STATE Outputs
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
74ACT258 Rev. 1.4
www.fairchildsemi.com
3
74ACT258 Quad 2-Input Multiplexer with 3-STATE Outputs
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
74ACT258 Rev. 1.4
www.fairchildsemi.com
4
74ACT258 Quad 2-Input Multiplexer with 3-STATE Outputs
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
Guaranteed Limits
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
±2.5
1.5
75
–75
µA
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
3.86
4.86
0.001
0.001
0.1
0.1
0.36
0.36
±0.1
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
:
4.5
5.5
I
IN
I
OZ
I
CCT
I
OLD
I
OHD
I
CC
Maximum Input
Leakage Current
Maximum 3-STATE
Current
Maximum I
CC
/Input
Minimum Dynamic
Output Current
(2)
Maximum Quiescent
Supply Current
5.5
5.5
5.5
5.5
5.5
5.5
I
OL
=
24mA
I
OL
=
24mA
(1)
V
I
=
V
CC
, GND
V
I
= V
IL
, V
IH
;
V
O
= 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
±0.25
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
74ACT258 Rev. 1.4
www.fairchildsemi.com
5
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
