Datasheet MC74ACT138ML2, MC74ACT138MR2, MC74ACT138DTEL, MC74ACT138DTR2, MC74ACT138M Datasheet (MOTOROLA)
...Page 1
5-1
FACT DATA
The MC74AC138/74ACT138 is a high-speed 1-of-8 decoder/demultiplexer. 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 MC74AC138/74ACT138 devices or a 1-of-32 decoder using four MC74AC138/
74ACT138 devices and one inverter.
• Demultiplexing Capability
• Multiple Input Enable for Easy Expansion
• Active LOW Mutually Exclusive Outputs
• Outputs Source/Sink 24 mA
• ′ACT138 Has TTL Compatible Inputs
V
CC
GNDA0A1A2E
1E2E3
1516 14 13 12 11 10
21 3 4 5 6 7
9
8
O
7
O
0O1O2O3O4O5O6
PIN NAMES
A0–A2Address Inputs
E
1–E2
Enable Inputs
E
3
Enable Input
O
0–O7
Outputs
1-OF-8 DECODER/
DEMULTIPLEXER
N SUFFIX
CASE 648-08
PLASTIC
D SUFFIX
CASE 751B-05
PLASTIC
LOGIC SYMBOL
A0A1A
2
E1E2E
3
O1O2O3O4O5O6O
7
O
0
Page 2
MC74AC138 MC74ACT138
5-2
FACT DATA
FUNCTIONAL DESCRIPTION
The MC74AC138/74ACT138 high-speed 1-of-8 decoder/
demultiplexer accepts three binary weighted inputs (A0, A1,
A2) and, when enabled, provides eight mutually exclusive
active-LOW outputs (O
0–O7
). The MC74AC138/74ACT138
features three Enable inputs, two active-LOW (E
1
, E2) and one
active-HIGH (E3). All outputs will be HIGH unless E
1
and E
2
are LOW and E3 is HIGH. This multiple enabled function
allows easy parallel expansion of the device to a 1-of-32 (5
lines to 32 lines) decoder with just four MC74AC138/
74ACT138 devices and one inverter (See Figure a). The
MC74AC138/74ACT138 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.
TRUTH TABLE
Inputs Outputs
E
1
E2E3A0A
1
A2O0O1O2O3O4O5O6O
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
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
A2A
1
A
0
E
3
E
1E2
0
7
0
6
0
5
0
4
0
3
0
2
0
1
0
0
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.
Page 3
MC74AC138 MC74ACT138
5-3
FACT DATA
H
123 123 123 123
A
0
A
2
A
3
A
4
A0A1A
2
E
000102030405060
7
A0A1A
2
E
000102030405060
7
A0A1A
2
E
000102030405060
7
A0A1A
2
E
000102030405060
7
0
0
0
31
′
04
Figure a: Expansion to 1-of-32 Decoding
A
1
MAXIMUM RATINGS*
Symbol Parameter Value Unit
V
CC
DC Supply Voltage (Referenced to GND) –0.5 to +7.0 V
V
in
DC Input Voltage (Referenced to GND) –0.5 to VCC +0.5 V
V
out
DC Output Voltage (Referenced to GND) –0.5 to VCC +0.5 V
I
in
DC Input Current, per Pin ±20 mA
I
out
DC Output Sink/Source Current, per Pin ±50 mA
I
CC
DC VCC or GND Current per Output Pin ±50 mA
T
stg
Storage Temperature –65 to +150 °C
* Maximum Ratings are those values beyond which damage to the device may occur. Functional operation should be restricted to the Recommended
Operating Conditions.
RECOMMENDED OPERATING CONDITIONS
Symbol Parameter Min Typ Max Unit
′AC 2.0 5.0 6.0
VCCSupply Voltage
′ACT 4.5 5.0 5.5
V
Vin, V
out
DC Input Voltage, Output Voltage (Ref. to GND) 0 V
CC
V
VCC @ 3.0 V 150
tr, t
f
Input Rise and Fall Time (Note 1)
′AC Devices except Schmitt Inputs
VCC @ 4.5 V 40 ns/V
r
, t
f
′AC Devices except Schmitt Inputs
VCC @ 5.5 V 25
Input Rise and Fall Time (Note 2)
VCC @ 4.5 V 10
tr, t
f
Input Rise and Fall Time (Note 2)
′ACT Devices except Schmitt Inputs
VCC @ 5.5 V 8.0
ns/V
T
J
Junction Temperature (PDIP) 140 °C
T
A
Operating Ambient Temperature Range –40 25 85 °C
I
OH
Output Current — High –24 mA
I
OL
Output Current — Low 24 mA
1. Vin from 30% to 70% VCC; see individual Data Sheets for devices that differ from the typical input rise and fall times.
2. Vin from 0.8 V to 2.0 V; see individual Data Sheets for devices that differ from the typical input rise and fall times.
Page 4
MC74AC138 MC74ACT138
5-4
FACT DATA
DC CHARACTERISTICS
74AC 74AC
Symbol
Parameter
V
CC
(V)
TA = +25°C
TA =
–40°C to +85°C
Unit
Conditions
Typ Guaranteed Limits
V
IH
Minimum High Level
3.0 1.5 2.1 2.1 V
OUT
= 0.1 V
Input Voltage
4.5 2.25 3.15 3.15 V or VCC – 0.1 V
5.5 2.75 3.85 3.85
V
IL
Maximum Low Level
3.0 1.5 0.9 0.9 V
OUT
= 0.1 V
Input Voltage
4.5 2.25 1.35 1.35 V or VCC – 0.1 V
5.5 2.75 1.65 1.65
V
OH
Minimum High Level
3.0 2.99 2.9 2.9 I
OUT
= –50 µA
Output Voltage
4.5 4.49 4.4 4.4 V
5.5 5.49 5.4 5.4
*VIN = VIL or V
IH
3.0 2.56 2.46
–12 mA
4.5 3.86 3.76
V
I
OH
–24 mA
5.5 4.86 4.76 –24 mA
V
OL
Maximum Low Level
3.0 0.002 0.1 0.1 I
OUT
= 50 µA
Output Voltage
4.5 0.001 0.1 0.1 V
5.5 0.001 0.1 0.1
*VIN = VIL or V
IH
3.0 0.36 0.44
12 mA
4.5 0.36 0.44
V
I
OL
24 mA
5.5 0.36 0.44 24 mA
I
IN
Maximum Input
Leakage Current
5.5
±0.1
±1.0
µA
VI = VCC, GND
I
OLD
†Minimum Dynamic
5.5 75 mA V
OLD
= 1.65 V Max
I
OHD
Output Current
5.5 –75 mA V
OHD
= 3.85 V Min
I
CC
Maximum Quiescent
Supply Current
5.5
8.080µA
VIN = VCC or GND
* All outputs loaded; thresholds on input associated with output under test.
†Maximum test duration 2.0 ms, one output loaded at a time.
Note: IIN and ICC @ 3.0 V are guaranteed to be less than or equal to the respective limit @ 5.5 V VCC.
Page 5
MC74AC138 MC74ACT138
5-5
FACT DATA
AC CHARACTERISTICS (For Figures and Waveforms — See Section 3)
74AC 74AC
Symbol
Parameter
VCC*
(V)
TA = +25°C
CL = 50 pF
TA = –40°C
to +85°C
CL = 50 pF
Unit
Fig.
No.
Min Typ Max Min Max
Propagation Delay
3.3 1.5 8.5 13.0 1.5 15.0
t
PLH
An to O
n
5.0 1.5 6.5 9.5 1.5 10.5
ns
3-6
Propagation Delay
3.3 1.5 8.0 12.5 1.5 14.0
t
PHL
An to O
n
5.0 1.5 6.0 9.0 1.5 10.5
ns
3-6
Propagation Delay
3.3 1.5 11.0 15.0 1.5 16.0
t
PLH
E
1
or E2 to O
n
5.0 1.5 8.0 11.0 1.5 12.0
ns
3-6
Propagation Delay
3.3 1.5 9.5 13.5 1.5 15.0
t
PHL
E
1
or E2 to O
n
5.0 1.5 7.0 9.5 1.5 10.5
ns
3-6
Propagation Delay
3.3 1.5 11.0 15.5 1.5 16.5
t
PLH
E3 to O
n
5.0 1.5 8.0 11.0 1.5 12.5
ns
3-6
Propagation Delay
3.3 1.5 8.5 13.0 1.5 14.0
t
PHL
E3 to O
n
5.0 1.5 6.0 8.0 1.0 9.5
ns
3-6
* Voltage Range 3.3 V is 3.3 V ±0.3 V.
Voltage Range 5.0 V is 5.0 V ±0.5 V.
DC CHARACTERISTICS
74ACT 74ACT
Symbol
Parameter
V
CC
(V)
TA = +25°C
TA =
–40°C to +85°C
Unit
Conditions
Typ Guaranteed Limits
V
IH
Minimum High Level
4.5 1.5 2.0 2.0
V
OUT
= 0.1 V
Input Voltage
5.5 1.5 2.0 2.0
V
or VCC – 0.1 V
V
IL
Maximum Low Level
4.5 1.5 0.8 0.8
V
OUT
= 0.1 V
Input Voltage
5.5 1.5 0.8 0.8
V
or VCC – 0.1 V
V
OH
Minimum High Level
4.5 4.49 4.4 4.4
I
OUT
= –50 µA
Output Voltage
5.5 5.49 5.4 5.4
V
*VIN = VIL or V
IH
4.5 3.86 3.76 V
–24 mA
5.5 4.86 4.76
I
OH
–24 mA
V
OL
Maximum Low Level
4.5 0.001 0.1 0.1
I
OUT
= 50 µA
Output Voltage
5.5 0.001 0.1 0.1
V
*VIN = VIL or V
IH
4.5 0.36 0.44 V
24 mA
5.5 0.36 0.44
I
OL
24 mA
I
IN
Maximum Input
Leakage Current
5.5
±0.1
±1.0
µA
VI = VCC, GND
∆I
CCT
Additional Max. ICC/Input 5.5 0.6 1.5 mA VI = VCC – 2.1 V
I
OLD
†Minimum Dynamic
5.5 75 mA V
OLD
= 1.65 V Max
I
OHD
Output Current
5.5 –75 mA V
OHD
= 3.85 V Min
I
CC
Maximum Quiescent
Supply Current
5.5
8.080µA
VIN = VCC or GND
* All outputs loaded; thresholds on input associated with output under test.
†Maximum test duration 2.0 ms, one output loaded at a time.
Page 6
MC74AC138 MC74ACT138
5-6
FACT DATA
AC CHARACTERISTICS (For Figures and Waveforms — See Section 3)
74ACT 74ACT
Symbol
Parameter
VCC*
(V)
TA = +25°C
CL = 50 pF
TA = –40°C
to +85°C
CL = 50 pF
Unit
Fig.
No.
Min Typ Max Min Max
Propagation Delay
t
PLH
An to O
n
5.0
1.5
7.0
10.5
1.5
11.5ns3-6
Propagation Delay
t
PHL
An to O
n
5.0
1.5
6.5
10.5
1.5
11.5ns3-6
Propagation Delay
t
PLH
E
1
or E2 to O
n
5.0
2.5
8.0
11.5
2.0
12.5ns3-6
Propagation Delay
t
PHL
E
1
or E2 to O
n
5.0
2.0
7.5
11.5
2.0
12.5ns3-6
Propagation Delay
t
PLH
E3 to O
n
5.0
2.5
8.0
12.0
2.0
13.0ns3-6
Propagation Delay
t
PHL
E3 to O
n
5.0
2.0
6.5
10.5
1.5
11.5ns3-6
Voltage Range 5.0 V is 5.0 V ± 0.5 V
CAPACITANCE
Symbol Parameter
Value
Typ
Unit Test Conditions
C
IN
Input Capacitance 4.5 pF VCC = 5.0 V
C
PD
Power Dissipation Capacitance 60 pF VCC = 5.0 V
Page 7
MC74AC138 MC74ACT138
5-7
FACT DATA
OUTLINE DIMENSIONS
N SUFFIX
PLASTIC DIP PACKAGE
CASE 648–08
ISSUE R
D SUFFIX
PLASTIC SOIC PACKAGE
CASE 751B–05
ISSUE J
NOTES:
1. DIMENSIONING AND TOLERANCING PER
ANSI Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DIMENSIONS A AND B DO NOT INCLUDE
MOLD PROTRUSION.
4. MAXIMUM MOLD PROTRUSION 0.15 (0.006)
PER SIDE.
5. DIMENSION D DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.127 (0.005) TOTAL
IN EXCESS OF THE D DIMENSION AT
MAXIMUM MATERIAL CONDITION.
1 8
16 9
SEATING
PLANE
F
J
M
R
X 45
_
G
8 PLP
–B–
–A–
M
0.25 (0.010) B
S
–T–
D
K
C
16 PL
S
B
M
0.25 (0.010) A
S
T
DIM MIN MAX MIN MAX
INCHESMILLIMETERS
A 9.80 10.00 0.386 0.393
B 3.80 4.00 0.150 0.157
C 1.35 1.75 0.054 0.068
D 0.35 0.49 0.014 0.019
F 0.40 1.25 0.016 0.049
G 1.27 BSC 0.050 BSC
J 0.19 0.25 0.008 0.009
K 0.10 0.25 0.004 0.009
M 0 7 0 7
P 5.80 6.20 0.229 0.244
R 0.25 0.50 0.010 0.019
_ _ _ _
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. DIMENSION L TO CENTER OF LEADS WHEN
FORMED PARALLEL.
4. DIMENSION B DOES NOT INCLUDE MOLD FLASH.
5. ROUNDED CORNERS OPTIONAL.
–A–
B
F
C
S
H
G
D
J
L
M
16 PL
SEATING
1 8
916
K
PLANE
–T–
M
A
M
0.25 (0.010) T
DIM MIN MAX MIN MAX
MILLIMETERSINCHES
A 0.740 0.770 18.80 19.55
B 0.250 0.270 6.35 6.85
C 0.145 0.175 3.69 4.44
D 0.015 0.021 0.39 0.53
F 0.040 0.70 1.02 1.77
G 0.100 BSC 2.54 BSC
H 0.050 BSC 1.27 BSC
J 0.008 0.015 0.21 0.38
K 0.110 0.130 2.80 3.30
L 0.295 0.305 7.50 7.74
M 0 10 0 10
S 0.020 0.040 0.51 1.01
____
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MC74AC138/D
*MC74AC138/D*
◊
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