74AC253 • 74ACT253 Dual 4-Input Multiplexer with 3-STATE Outputs
November 1988
Revised October 2000
74AC253 • 74ACT253
Dual 4-Input Multiplexer with 3-STATE Outputs
General Description
The AC/ACT253 is a dual 4-input multiplexer with 3-STATE
outputs. It can select two bits of data from four sources
using common select inputs. The outputs may be individu-
ally switched to a high impedance state with a HIGH on the
respective Output Enable (OE) inputs, allowing the outputs
to interface directly with bus oriented systems.
Features
s
I
CC
and I
OZ
reduced by 50%
s
Multifunction capability
s
Non inverting 3-STATE outputs
s
Outputs source/sink 24 mA
s
ACT253 has TTL-compatible inputs
Ordering Code:
Order Number
74AC253SC
74AC253SJ
74AC253PC
74ACT253SC
74ACT253SJ
74ACT253MTC
74ACT253PC
Package Number
M16A
M16D
N16E
M16A
M16D
MTC16
N16E
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 Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
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
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Device also available Tape and Reel. Specify by appending suffix letter “X” to the ordering code.
Logic Diagrams
Connection Diagram
IEEE/IEC
Pin Descriptions
Pin Names
I
0a
–I
3a
I
0b
–I
3b
S
0
, S
1
OE
a
OE
b
Z
a
, Z
b
Description
Side A Data Inputs
Side B Data Inputs
Common Select Inputs
Side A Output Enable Input
Side B Output Enable Input
3-STATE Outputs
FACT is a trademark of Fairchild Semiconductor Corporation.
© 2000 Fairchild Semiconductor Corporation
DS009946
www.fairchildsemi.com
74AC253 • 74ACT253
Functional Description
The AC/ACT253 contains two identical 4-input multiplexers
with 3-STATE outputs. They select two bits from four
sources selected by common Select inputs (S
0
, S
1
). The
4-input multiplexers have individual Output Enable (OE
a
,
OE
b
) inputs which, when HIGH, force the outputs to a high
impedance (High Z) state. This device is the logic imple-
mentation 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:
Z
a
=
OE
a
•
Z
b
=
OE
b
•
(I
0a
• S
1
• S
0
+
I
1a
• S
1
• S
0
+
I
2a
• S
1
• S
0
+
I
3a
• S
1
• S
0
)
(I
0b
• S
1
• S
0
+
I
1b
• S
1
• S
0
+
I
2b
• S
1
• S
0
+
I
3b
• S
1
• S
0
)
If the outputs of 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 that there is no overlap.
Truth Table
Select
Data Inputs
Inputs
S
0
X
L
L
H
H
L
L
H
H
S
1
X
L
L
L
L
H
H
H
H
I
0
X
L
H
X
X
X
X
X
X
I
1
X
X
X
L
H
X
X
X
X
I
2
X
X
X
X
X
L
H
X
X
I
3
X
X
X
X
X
X
X
L
H
Enable
OE
H
L
L
L
L
L
L
L
L
Z
Z
L
H
L
H
L
H
L
H
Output
Outputs
Address Inputs S
0
and S
1
are common to both sections.
H
=
HIGH Voltage Level
L
=
LOW Voltage Level
X
=
Immaterial
Z
=
High Impedance
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.
www.fairchildsemi.com
2
74AC253 • 74ACT253
Absolute Maximum Ratings
(Note 1)
Supply Voltage (V
CC
)
DC Input Diode Current (I
IK
)
V
I
= −
0.5V
V
I
=
V
CC
+
0.5V
DC Input Voltage (V
I
)
DC Output Diode Current (I
OK
)
V
O
= −
0.5V
V
O
=
V
CC
+
0.5V
DC Output Voltage (V
O
)
DC Output Source
or Sink Current (I
O
)
DC V
CC
or Ground Current
per Output Pin (I
CC
or I
GND
)
Storage Temperature (T
STG
)
Junction Temperature (T
J
)
PDIP
140
°
C
−
0.5V to
+
7.0V
−
20 mA
+
20 mA
−
0.5V to V
CC
+
0.5V
−
20 mA
+
20 mA
−
0.5V to V
CC
+
0.5V
±
50 mA
±
50 mA
−
65
°
C to
+
150
°
C
Recommended Operating
Conditions
Supply Voltage (V
CC
)
AC
ACT
Input Voltage (V
I
)
Output Voltage (V
O
)
Operating Temperature (T
A
)
Minimum Input Edge Rate (
∆
V/
∆
t)
AC Devices
V
IN
from 30% to 70% of V
CC
V
CC
@ 3.3V, 4.5V, 5.5V
Minimum Input Edge Rate (
∆
V/
∆
t)
ACT Devices
V
IN
from 0.8V to 2.0V
V
CC
@ 4.5V, 5.5V
125 mV/ns
Note 1:
Absolute maximum ratings are those values beyond which damage
to the device may occur. The databook specifications should be met, with-
out exception, to ensure that the system design is reliable over its power
supply, temperature, and output/input loading variables. Fairchild does not
recommend operation of FACT circuits outside databook specifications.
2.0V to 6.0V
4.5V to 5.5V
0V to V
CC
0V to V
CC
−
40
°
C to
+
85
°
C
125 mV/ns
DC Electrical Characteristics for AC
Symbol
V
IH
Parameter
Minimum HIGH Level
Input Voltage
V
IL
Maximum LOW Level
Input Voltage
V
OH
Minimum HIGH Level
Output Voltage
V
CC
(V)
3.0
4.5
5.5
3.0
4.5
5.5
3.0
4.5
5.5
3.0
4.5
5.5
V
OL
Maximum LOW Level
Output Voltage
3.0
4.5
5.5
3.0
4.5
5.5
I
IN
(Note 4)
I
OZ
Maximum Input Leakage Current
Maximum 3-STATE
Current
I
OLD
I
OHD
I
CC
(Note 4)
Minimum Dynamic
Output Current (Note 3)
Maximum Quiescent Supply Current
5.5
5.5
5.5
5.5
4.0
±0.25
±2.5
75
−75
40.0
µA
mA
mA
µA
5.5
0.002
0.001
0.001
T
A
= +25°C
Typ
1.5
2.25
2.75
1.5
2.25
2.75
2.99
4.49
5.49
2.1
3.15
3.85
0.9
1.35
1.65
2.9
4.4
5.4
2.56
3.86
4.86
0.1
0.1
0.1
0.36
0.36
0.36
±
0.1
T
A
= −40°C
to
+85°C
Guaranteed Limits
2.1
3.15
3.85
0.9
1.35
1.65
2.9
4.4
5.4
V
IN
=
V
IL
or V
IH
2.46
3.76
4.76
0.1
0.1
0.1
V
IN
=
V
IL
or V
IH
0.44
0.44
0.44
±
1.0
µA
V
I
OL
=
12 mA
I
OL
=
24 mA
I
OL
=
24 mA (Note 2)
V
I
=
V
CC
, GND
V
I
(OE)
=
V
IL
, V
IH
V
I
=
V
CC
, GND
V
O
=
V
CC
, GND
V
OLD
=
1.65V Max
V
OHD
=
3.85V Min
V
IN
=
V
CC
or GND
V
I
OUT
=
50
µA
V
I
OH
= −12
mA
I
OH
= −24
mA
I
OH
= −24
mA (Note 2)
V
I
OUT
= −50 µA
V
V
OUT
=
0.1V
or V
CC
−
0.1V
V
Units
Conditions
V
OUT
=
0.1V
or V
CC
−
0.1V
Note 2:
All outputs loaded; thresholds on input associated with output under test.
Note 3:
Maximum test duration 2.0 ms, one output loaded at a time.
Note 4:
I
IN
and I
CC
@ 3.0V are guaranteed to be less than or equal to the respective limit @ 5.5V V
CC
.
3
www.fairchildsemi.com
74AC253 • 74ACT253
DC Electrical Characteristics for ACT
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
4.5
5.5
V
OL
Maximum LOW Level
Output Voltage
4.5
5.5
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 (Note 6)
Maximum Quiescent
Supply Current
5.5
5.5
5.5
5.5
5.5
5.5
4.0
0.6
0.001
0.001
1.5
1.5
1.5
1.5
4.49
5.49
T
A
= +25°C
Typ
2.0
2.0
0.8
0.8
4.4
5.4
3.86
4.86
0.1
0.1
0.36
0.36
±0.1
±0.25
T
A
= −40°C
to
+85°C
Guaranteed Limits
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
40.0
µA
µA
mA
mA
mA
µA
V
Units
V
V
V
Conditions
V
OUT
=
0.1V
or V
CC
−
0.1V
V
OUT
=
0.1V
or V
CC
−
0.1V
I
OUT
= −50 µA
V
IN
=
V
IL
or V
IH
V
I
OH
= −24
mA
I
OH
= −24
mA (Note 5)
I
OUT
=
50
µA
V
IN
=
V
IL
or V
IH
V
I
OL
=
24 mA
I
OL
=
24 mA (Note 5)
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
Note 5:
All outputs loaded; thresholds on input associated with output under test.
Note 6:
Maximum test duration 2.0 ms, one output loaded at a time.
AC Electrical Characteristics for AC
V
CC
Symbol
t
PLH
t
PHL
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Parameter
Propagation Delay
S
n
to Z
n
Propagation Delay
S
n
to Z
n
Propagation Delay
I
n
to Z
n
Propagation Delay
I
n
to Z
n
Output Enable Time
Output Enable Time
Output Disable Time
Output Disable Time
(V)
(Note 7)
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
Note 7:
Voltage Range 3.3 is 3.3V
±
0.3V
Voltage Range 5.0 is 5.0V
±
0.5V
T
A
= +25°C
C
L
=
50 pF
Min
2.0
2.0
2.5
2.0
1.5
1.5
2.0
1.5
1.5
1.5
1.5
1.5
2.0
2.0
1.5
1.5
Typ
8.5
6.5
9.5
7.0
7.0
5.5
7.5
5.5
4.5
3.5
5.0
3.5
5.5
5.0
5.0
4.0
Max
15.5
11.0
16.0
11.5
14.5
10.0
13.0
9.5
8.0
6.0
8.0
6.0
9.5
8.0
8.0
7.0
T
A
= −40°C
to
+85°C
C
L
=
50 pF
Min
2.0
1.5
2.0
1.5
1.5
1.5
1.5
1.5
1.0
1.0
1.0
1.0
1.5
1.5
1.0
1.0
Max
17.5
12.5
18.0
13.0
17.0
11.5
15.0
11.0
8.5
6.5
9.0
7.0
10.0
8.5
9.0
7.5
ns
ns
ns
ns
ns
ns
ns
ns
Units
www.fairchildsemi.com
4
74AC253 • 74ACT253
AC Electrical Characteristics for ACT
V
CC
Symbol
t
PLH
t
PHL
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Parameter
Propagation Delay
S
n
to Z
n
Propagation Delay
S
n
to Z
n
Propagation Delay
I
n
to Z
n
Propagation Delay
I
n
to Z
n
Output Enable Time
Output Enable Time
Output Disable Time
Output Disable Time
(V)
(Note 8)
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
Min
2.0
3.0
2.5
3.5
2.0
2.0
3.0
2.5
T
A
= +25°C
C
L
=
50 pF
Typ
7.0
7.5
5.5
6.5
4.5
5.0
6.0
4.5
Max
11.5
13.0
10.0
11.0
7.5
8.0
9.5
7.5
T
A
= −40°C
to
+85°C
C
L
=
50 pF
Min
2.0
2.5
2.0
3.0
1.5
1.5
2.5
2.0
Max
13.0
14.5
11.0
12.5
8.5
9.0
10.0
8.5
ns
ns
ns
ns
ns
ns
ns
ns
Units
Note 8:
Voltage Range 5.0 is 5.0V
±
0.5V
Capacitance
Symbol
C
IN
C
PD
Parameter
Input Capacitance
Power Dissipation Capacitance
Typ
4.5
50.0
Units
pF
pF
V
CC
=
OPEN
V
CC
=
5.0V
Conditions
5
www.fairchildsemi.com
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
