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Электронный компонент: 74ACT138SC

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2000 Fairchild Semiconductor Corporation
DS009925
www.fairchildsemi.com
November 1988
Revised August 2000
7
4
AC
1
38
74ACT138 1-of
-8 Decoder
/
Demult
ip
lexer
74AC138 74ACT138
1-of-8 Decoder/Demultiplexer
General Description
The AC/ACT138 is a high-speed 1-of-8 decoder/demulti-
plexer. This device is ideally suited for high-speed bipolar
memory chip select address decoding. The multiple input
enables allow parallel expansion to a 1-of-24 decoder
using just three AC/ACT138 devices or a 1-of-32 decoder
using four AC/ACT138 devices and one inverter.
Features
s
I
CC
reduced by 50%
s
Demultiplexing capability
s
Multiple input enable for easy expansion
s
Active LOW mutually exclusive outputs
s
Outputs source/sink 24 mA
s
ACT138 has TTL-compatible inputs
Ordering Code:
Device also available in Tape and Reel. Specify by appending suffix letter "X" to the ordering code.
Connection Diagram
Pin Descriptions
Logic Symbols
IEEE/IEC
FACT
is a trademark of Fairchild Semiconductor Corporation.
Order Number
Package Number
Package Description
74AC138SC
M16A
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
74AC138SJ
M16D
16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74AC138MTC
MTC16
16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
74AC138PC
N16E
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
74ACT138SC
M16A
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
74ACT138SJ
M16D
16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74ACT138PC
N16E
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Pin Names
Description
A
0
A
2
Address Inputs
E
1
E
2
Enable Inputs
E
3
Enable Input
O
0
O
7
Outputs
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2
74AC138

74ACT138
Truth Table
H
=
HIGH Voltage Level
L
=
LOW Voltage Level
X
=
Immaterial
Functional Description
The AC/ACT138 high-speed 1-of-8 decoder/demultiplexer
accepts three binary weighted inputs (A
0
, A
1
, A
2
) and,
when enabled, provides eight mutually exclusive active-
LOW outputs (O
0
O
7
). The AC/ACT138 features three
Enable inputs, two active-LOW (E
1
, E
2
) and one active-
HIGH (E
3
). All outputs will be HIGH unless E
1
and E
2
are
LOW and E
3
is HIGH. This multiple enable function allows
easy parallel expansion of the device to a 1-of-32 (5 lines
to 32 lines) decoder with just four AC/ACT138 devices and
one inverter (see Figure 1). The AC/ACT138 can be used
as an 8-output demultiplexer by using one of the active
LOW Enable inputs as the data input and the other Enable
inputs as strobes. The Enable inputs which are not used
must be permanently tied to their appropriate active-HIGH
or active-LOW state.
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. Expansion to 1-of-32 Decoding
Inputs
Outputs
E
1
E
2
E
3
A
0
A
1
A
2
O
0
O
1
O
2
O
3
O
4
O
5
O
6
O
7
H
X
X
X
X
X
H
H
H
H
H
H
H
H
X
H
X
X
X
X
H
H
H
H
H
H
H
H
X
X
L
X
X
X
H
H
H
H
H
H
H
H
L
L
H
L
L
L
L
H
H
H
H
H
H
H
L
L
H
H
L
L
H
L
H
H
H
H
H
H
L
L
H
L
H
L
H
H
L
H
H
H
H
H
L
L
H
H
H
L
H
H
H
L
H
H
H
H
L
L
H
L
L
H
H
H
H
H
L
H
H
H
L
L
H
H
L
H
H
H
H
H
H
L
H
H
L
L
H
L
H
H
H
H
H
H
H
H
L
H
L
L
H
H
H
H
H
H
H
H
H
H
H
L
3
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74
A
C
13
8


74ACT138
Absolute Maximum Ratings
(Note 1)
Recommended Operating
Conditions
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.
DC Electrical Characteristics for AC
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
.
Supply Voltage (V
CC
)
-
0.5V to
+
7.0V
DC Input Diode Current (I
IK
)
V
I
=
-
0.5V
-
20 mA
V
I
=
V
CC
+
0.5V
+
20 mA
DC Input Voltage (V
I
)
-
0.5V to V
CC
+
0.5V
DC Output Diode Current (I
OK
)
V
O
=
-
0.5V
-
20 mA
V
O
=
V
CC
+
0.5V
+
20 mA
DC Output Voltage (V
O
)
-
0.5V to V
CC
+
0.5V
DC Output Source
or Sink Current (I
O
)
50 mA
DC V
CC
or Ground Current
per Output Pin (I
CC
or I
GND
)
50 mA
Storage Temperature (T
STG
)
-
65
C to
+
150
C
Junction Temperature (T
J
)
PDIP
140
C
Supply Voltage (V
CC
)
AC
2.0V to 6.0V
ACT
4.5V to 5.5V
Input Voltage (V
I
)
0V to V
CC
Output Voltage (V
O
)
0V to V
CC
Operating Temperature (T
A
)
-
40
C to
+
85
C
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
125 mV/ns
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
Symbol
Parameter
V
CC
T
A
=
+
25
C
T
A
=
-
40
C to
+
85
C
Units
Conditions
(V)
Typ
Guaranteed Limits
V
IH
Minimum HIGH Level
3.0
1.5
2.1
2.1
V
OUT
=
0.1V
Input Voltage
4.5
2.25
3.15
3.15
V
or V
CC
-
0.1V
5.5
2.75
3.85
3.85
V
IL
Maximum LOW Level
3.0
1.5
0.9
0.9
V
OUT
=
0.1V
Input Voltage
4.5
2.25
1.35
1.35
V
or V
CC
-
0.1V
5.5
2.75
1.65
1.65
V
OH
Minimum HIGH Level
3.0
2.99
2.9
2.9
Output Voltage
4.5
4.49
4.4
4.4
V
I
OUT
=
-
50
A
5.5
5.49
5.4
5.4
V
IN
=
V
IL
or V
IH
3.0
2.56
2.46
I
OH
=
-
12 mA
4.5
3.86
3.76
V
I
OH
=
-
24 mA
5.5
4.86
4.76
I
OH
=
-
24 mA (Note 2)
V
OL
Maximum LOW Level
3.0
0.002
0.1
0.1
Output Voltage
4.5
0.001
0.1
0.1
V
I
OUT
=
50
A
5.5
0.001
0.1
0.1
V
IN
=
V
IL
or V
IH
3.0
0.36
0.44
I
OL
=
24 mA
4.5
0.36
0.44
V
I
OL
=
24 mA 0
5.5
0.36
0.44
I
OL
=
24 mA (Note 2)
I
IN
Maximum
Input
5.5
0.1
1.0
A
V
I
=
V
CC
, GND
(Note 4)
Leakage Current
I
OLD
Minimum Dynamic
5.5
75
mA
V
OLD
=
1.65V Max
I
OHD
Output Current (Note 3)
5.5
-
75
mA
V
OHD
=
3.85V Min
I
CC
(Note 4)
Maximum Quiescent
Supply Current
5.5
4.0
40.0
A
V
IN
=
V
CC
or GND
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4
74AC138

74ACT138
DC Electrical Characteristics for ACT
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
Note 7: Voltage Range 3.3 is 3.3V
0.3V
Voltage Range 5.0 is 5.0V
0.5V
Symbol
Parameter
V
CC
T
A
=
+
25
C
T
A
=
-
40
C to
+
85
C
Units
Conditions
(V)
Typ
Guaranteed Limits
V
IH
Minimum HIGH Level
4.5
1.5
2.0
2.0
V
V
OUT
=
0.1V
Input Voltage
5.5
1.5
2.0
2.0
or V
CC
-
0.1V
V
IL
Maximum LOW Level
4.5
1.5
0.8
0.8
V
V
OUT
=
0.1V
Input Voltage
5.5
1.5
0.8
0.8
or V
CC
-
0.1V
V
OH
Minimum HIGH Level
4.5
4.49
4.4
4.4
V
I
OUT
=
-
50
A
Output Voltage
5.5
5.49
5.4
5.4
V
IN
=
V
IL
or V
IH
4.5
3.86
3.76
V
I
OH
=
-
24 mA
5.5
4.86
4.76
I
OH
=
-
24 mA (Note 5)
V
OL
Maximum LOW Level
4.5
0.001
0.1
0.1
V
I
OUT
=
50
A
Output Voltage
5.5
0.001
0.1
0.1
V
IN
=
V
IL
or V
IH
4.5
0.36
0.44
V
I
OL
24 mA
5.5
0.36
0.44
I
OL
.
=
24 mA (Note 5)
I
IN
Maximum Input
5.5
0.1
1.0
A
V
I
=
V
CC
, GND
Leakage Current
I
CCT
Maximum
5.5
0.6
1.5
mA
V
I
=
V
CC
-
2.1V
I
CC
/Input
I
OLD
Minimum Dynamic
5.5
75
mA
V
OLD
=
1.65V Max
I
OHD
Output Current (Note 6)
5.5
-
75
mA
V
OHD
=
3.85V Min
I
CC
Maximum Quiescent
5.5
4.0
40.0
A
V
IN
=
V
CC
or GND
Supply Current
V
CC
T
A
=
+
25
C
T
A
=
-
40
C to
+
85
C
Symbol
Parameter
(V)
C
L
=
50 pF
C
L
=
50 pF
Units
(Note 7)
Min
Typ
Max
Min
Max
t
PLH
Propagation Delay
3.3
1.5
8.5
13.0
1.5
15.0
ns
A
n
to O
n
5.0
1.5
6.5
9.5
1.5
10.5
t
PHL
Propagation Delay
3.3
1.5
8.0
12.5
1.5
14.0
ns
A
n
to O
n
5.0
1.5
6.0
9.0
1.5
10.5
t
PLH
Propagation Delay
3.3
1.5
11.0
15.0
1.5
16.0
ns
E
1
or E
2
to O
n
5.0
1.5
8.0
11.0
1.5
12.0
t
PHL
Propagation Delay
3.3
1.5
9.5
13.5
1.5
15.0
ns
E
1
or E
2
to O
n
5.0
1.5
7.0
9.5
1.5
10.5
t
PLH
Propagation Delay
3.3
1.5
11.0
15.5
1.5
16.5
ns
E
3
to O
n
5.0
1.5
8.0
11.0
1.5
12.5
t
PHL
Propagation Delay
3.3
1.5
8.5
13.0
1.5
14.0
ns
E
3
to O
n
5.0
1.5
6.0
8.0
1.0
9.5
5
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74
A
C
13
8


74ACT138
AC Electrical Characteristics for ACT
Note 8: Voltage Range 5.0 is 5.0V
0.5V
Capacitance
V
CC
T
A
=
+
25
C
T
A
=
-
40
C to
+
85
C
Symbol
Parameter
(V)
C
L
=
50 pF
C
L
=
50 pF
Units
(Note 8)
Min
Typ
Max
Min
Max
t
PLH
Propagation Delay
5.0
1.5
7.0
10.5
1.5
11.5
ns
A
n
to O
n
t
PHL
Propagation Delay
5.0
1.5
6.5
10.5
1.5
11.5
ns
A
n
to O
n
t
PLH
Propagation Delay
5.0
2.5
8.0
11.5
2.0
12.5
ns
E
1
or E
2
to O
n
t
PHL
Propagation Delay
5.0
2.0
7.5
11.5
2.0
12.5
ns
E
1
or E
2
to O
n
t
PLH
Propagation Delay
5.0
2.5
8.0
12.0
2.0
13.0
ns
E
3
to On
t
PHL
Propagation Delay
5.0
2.0
6.5
10.5
1.5
11.5
ns
E
3
to On
Symbol
Parameter
Typ
Units
Conditions
C
IN
Input Capacitance
4.5
pF
V
CC
=
OPEN
C
PD
Power Dissipation Capacitance
60.0
pF
V
CC
=
5.0V