IKSEMICON IN74AC138

TECHNICAL DATA
IN74AC138
1-of-8 Decoder/Demultiplexer
High-Speed Silicon-Gate CMOS
The IN74AC138 is identical in pinout to the LS/ALS138,
HC/HCT138. The device inputs are compatible with standard CMOS
outputs; with pullup resistors, they are compatible with LS/ALS outputs.
The IN74AC138 decodes a three-bit Address to one-of-eight activelow outputs. This device features three Chip Select inputs, two active-low
and one active-high to facilitate the demultiplexing, cascading, and chipselecting functions. The demultiplexing function is accomplished by using
the Address inputs to select the desired device output; one of the Chip
Selects is used as a data input while the other Chip Selects are held in
their active states.
• Outputs Directly Interface to CMOS, NMOS, and TTL
• Operating Voltage Range: 2.0 to 6.0 V
• Low Input Current: 1.0 μA; 0.1 μA @ 25°C
• High Noise Immunity Characteristic of CMOS Devices
• Outputs Source/Sink 24 mA
ORDERING INFORMATION
IN74AC138N Plastic
IN74AC138D SOIC
TA = -40° to 85° C for all packages
PIN ASSIGNMENT
LOGIC DIAGRAM
FUNCTION TABLE
Inputs
PIN 16 =VCC
PIN 8 = GND
Outputs
CS1 CS2 CS3
A2 A1 A0
Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7
X X H
X H X
L X X
X X X
X X X
X X X
H H H H H H H H
H H H H H H H H
H H H H H H H H
H
H
H
H
L
L
L
L
L
L
L
L
L
L
L
L
L
L
H
H
L
H
L
H
L
H
H
H
H
L
H
H
H
H
L
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
L
L
L
L
L
L
L
H
H
H
H
L
L
H
H
L
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
L
H
H
H
H
L
H
H
H
H
L
H = high level (steady state)
L = low level (steady state)
X = don’t care
Rev. 00
IN74AC138
MAXIMUM RATINGS*
Symbol
Parameter
Value
Unit
-0.5 to +7.0
V
VCC
DC Supply Voltage (Referenced to GND)
VIN
DC Input Voltage (Referenced to GND)
-0.5 to VCC +0.5
V
DC Output Voltage (Referenced to GND)
-0.5 to VCC +0.5
V
DC Input Current, per Pin
±20
mA
IOUT
DC Output Sink/Source Current, per Pin
±50
mA
ICC
DC Supply Current, VCC and GND Pins
±50
mA
PD
Power Dissipation in Still Air, Plastic DIP+
SOIC Package+
750
500
mW
-65 to +150
°C
260
°C
VOUT
IIN
Tstg
TL
Storage Temperature
Lead Temperature, 1 mm from Case for 10 Seconds
(Plastic DIP or SOIC Package)
*
Maximum Ratings are those values beyond which damage to the device may occur.
Functional operation should be restricted to the Recommended Operating Conditions.
+Derating - Plastic DIP: - 10 mW/°C from 65° to 125°C
SOIC Package: : - 7 mW/°C from 65° to 125°C
RECOMMENDED OPERATING CONDITIONS
Symbol
VCC
VIN, VOUT
DC Supply Voltage (Referenced to GND)
DC Input Voltage, Output Voltage (Referenced to GND)
TJ
Junction Temperature (PDIP)
TA
Operating Temperature, All Package Types
IOH
Output Current - High
IOL
Output Current - Low
tr, tf
*
Parameter
Input Rise and Fall Time
(except Schmitt Inputs)
*
Min
Max
Unit
2.0
6.0
V
0
VCC
V
140
°C
+85
°C
-24
mA
24
mA
150
40
25
ns/V
-40
VCC =3.0 V
VCC =4.5 V
VCC =5.5 V
0
0
0
VIN from 30% to 70% VCC
This device contains protection circuitry to guard against damage due to high static voltages or electric fields.
However, precautions must be taken to avoid applications of any voltage higher than maximum rated voltages to this
high-impedance circuit. For proper operation, VIN and VOUT should be constrained to the range GND≤(VIN or
VOUT)≤VCC.
Unused inputs must always be tied to an appropriate logic voltage level (e.g., either GND or VCC). Unused
outputs must be left open.
Rev. 00
IN74AC138
DC ELECTRICAL CHARACTERISTICS (Voltages Referenced to GND)
VCC
Symbol
Parameter
Test Conditions
Guaranteed Limits
V
25 °C
-40°C to
85°C
Unit
VIH
Minimum HighLevel Input Voltage
VOUT=0.1 V or VCC-0.1 V
3.0
4.5
5.5
2.1
3.15
3.85
2.1
3.15
3.85
V
VIL
Maximum Low Level Input Voltage
VOUT=0.1 V or VCC-0.1 V
3.0
4.5
5.5
0.9
1.35
1.65
0.9
1.35
1.65
V
VOH
Minimum HighLevel Output Voltage
IOUT ≤ -50 μA
3.0
4.5
5.5
2.9
4.4
5.4
2.9
4.4
5.4
V
3.0
4.5
5.5
2.56
3.86
4.86
2.46
3.76
4.76
3.0
4.5
5.5
0.1
0.1
0.1
0.1
0.1
0.1
VIN= VIH or VIL
IOL=12 mA
IOL=24 mA
IOL=24 mA
3.0
4.5
5.5
0.36
0.36
0.36
0.44
0.44
0.44
Maximum Input
Leakage Current
VIN=VCC or GND
5.5
±0.1
±1.0
μA
IOLD
+Minimum Dynamic
Output Current
VOLD=1.65 V Max
5.5
75
mA
IOHD
+Minimum Dynamic
Output Current
VOHD=3.85 V Min
5.5
-75
mA
ICC
Maximum Quiescent
Supply Current
(per Package)
VIN=VCC or GND
5.5
80
μA
*
VIN=VIH or VIL
IOH=-12 mA
IOH=-24 mA
IOH=-24 mA
VOL
Maximum LowLevel Output Voltage
IOUT ≤ 50 μA
V
*
IIN
8.0
*
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
Rev. 00
IN74AC138
AC ELECTRICAL CHARACTERISTICS (CL=50pF,Input tr=tf=3.0 ns)
VCC*
Symbol
Parameter
Guaranteed Limits
25 °C
V
Unit
-40°C to
85°C
Min
Max
Min
Max
tPLH
Propagation Delay, Input A to Output Y
(Figure 1)
3.3
5.0
1.5
1.5
13.0
9.5
1.5
1.5
15.0
10.5
ns
tPHL
Propagation Delay, Input A to Output Y
(Figure 1)
3.3
5.0
1.5
1.5
12.5
9.0
1.5
1.5
14.0
10.5
ns
tPLH
Propagation Delay, CS2 or CS3 to
Output Y (Figure 3)
3.3
5.0
1.5
1.5
15.0
11.0
1.5
1.5
16.0
12.0
ns
tPHL
Propagation Delay, CS2 or CS3 to
Output Y (Figure 3)
3.3
5.0
1.5
1.5
13.5
9.5
1.5
1.5
15.0
10.5
ns
tPLH
Propagation Delay, CS1 to Output Y
(Figure 2)
3.3
5.0
1.5
1.5
15.5
11.0
1.5
1.5
16.5
12.5
ns
tPHL
Propagation Delay, CS1 to Output Y
(Figure 2)
3.3
5.0
1.5
1.5
13.0
8.0
1.5
1.0
14.0
9.5
ns
CIN
Maximum Input Capacitance
5.0
4.5
4.5
pF
Typical @25°C,VCC=5.0 V
CPD
Power Dissipation Capacitance
60
pF
Voltage Range 3.3 V is 3.3 V ±0.3 V
Voltage Range 5.0 V is 5.0 V ±0.5 V
*
Figure 1. Switching Waveforms
Figure 2. Switching Waveforms
Figure 3. Switching Waveforms
Rev. 00
IN74AC138
EXPANDED LOGIC DIAGRAM
Rev. 00
IN74AC138
N SUFFIX PLASTIC DIP
(MS - 001BB)
A
Dimension, mm
9
16
Symbol
MIN
MAX
A
18.67
19.69
B
6.1
7.11
B
1
8
5.33
C
F
L
C
D
0.36
0.56
F
1.14
1.78
G
2.54
H
7.62
-T- SEATING
PLANE
N
G
K
M
H
D
J
0.25 (0.010) M T
NOTES:
1. Dimensions “A”, “B” do not include mold flash or protrusions.
Maximum mold flash or protrusions 0.25 mm (0.010) per side.
J
0°
10°
K
2.92
3.81
L
7.62
8.26
M
0.2
0.36
N
0.38
D SUFFIX SOIC
(MS - 012AC)
Dimension, mm
A
16
9
H
B
1
G
P
8
R x 45
C
-TK
D
SEATING
PLANE
J
0.25 (0.010) M T C M
NOTES:
1. Dimensions A and B do not include mold flash or protrusion.
2. Maximum mold flash or protrusion 0.15 mm (0.006) per side
for A; for B ‑ 0.25 mm (0.010) per side.
F
M
Symbol
MIN
MAX
A
9.8
10
B
3.8
4
C
1.35
1.75
D
0.33
0.51
F
0.4
1.27
G
1.27
H
5.72
J
0°
8°
K
0.1
0.25
M
0.19
0.25
P
5.8
6.2
R
0.25
0.5
Rev. 00