TECHNICAL DATA
IN74LV138
3-to-8 line decoder/demultiplexer;
inverting
The IN74LV138 is a low-voltage Si-gate CMOS device and is pin
and function compatible 74HCT138.
The74LV138 accepts three binary weighted address inputs -
(A
0
,A
1
,A
2
) and when enabled,provide 8 - mutually exclusive active
LOW outputs (Y
0
to Y
7
).
The “138” features three enable inputs: two active LOW (CS
2
,CS
3
and one active HIGH (CS
1
).Every output will be HIGH untess CS
2
, and
CS
3
are LOW and CS
1
is HIGH.
•
•
•
•
•
•
Optimized for Low Voltage applications:1.2 to 3.6 V
Demultiplexing capability
Multiple input enabte for easy expansion
Ideal for memory chip select decoding
Active LOW mutually exclusive outputs
Output capability: standard
16
1
16
1
D SUFFIX
SOIC
N SUFFIX
PLASTIC
ORDERING INFORMATION
IN74LV138N Plastic
IN74LV138D SOIC
T
A
= -40° to 125° C for all packages
PIN ASSIGNMENT
LOGIC DIAGRAM
FUNCTION TABLE
Inputs
CS1 CS2 CS3
X X H
X H X
L X X
PIN 16 =V
CC
PIN 8 = GND
H
H
H
H
H
H
H
H
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
A2 A1 A0
X X X
X X X
X X X
L L L
L L H
L H L
L H H
H L L
H L H
H H L
H H H
Outputs
Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7
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
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
L
H
H
H
H
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 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
INTEGRAL
1
IN74LV138
MAXIMUM RATINGS
Symbol
V
CC
I
IK
I
OK
I
O
I
CC
Tstg
P
D
*
Value
-0.5 to +7.0
±20
±50
±25
±50
-65 to +150
750
500
260
°C
V
I
<
- 0.5 or V
I
>
Vcc+0.5V
V
O
<
- 0.5 or V
O
>
Vcc+0.5V
-0.5Â<Vo<Vcc+0.5B
Conditions
Unit
V
mA
mA
mA
mA
°C
mW
Parameter
DC supply voltage
DC input diode current
DC output diode current
DC output source or sink current
DC V
CC
or GND current for types with
standard outputs
Storage Temperature
Power Dissipation per package
Plastic DIP+
SOIC Package+
Lead temperature, 1.5 mm from Case for 4
seconds
(Plastic DIP ), 0.3 mm (SOIC Package)
T
L
*
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: - 12 mW/°C from 70° to 125°C
SOIC Package: : - 8 mW/°C from 70° to 125°C
RECOMMENDED OPERATING CONDITIONS
Symbol
V
CC
V
IN
,
V
O
T
A
t
r
, t
f
DC supply voltage
DC input voltage,
DC output voltage
Operating ambient temperature range in free air
Input rise and fall times except for
Schmitt-trigger inputs
Vcc= 1.0
?
2.0Â
Vcc= 2.0
?
2.7Â
Vcc= 2.7
?
3.6Â
Vcc= 3.6
?
5.5Â
Parameter
Min
1.0
0
0
-40
0
0
0
Max
5.5
V
CC
V
CC
+125
500
200
100
50
Unit
V
V
V
°C
ns/B
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, V
IN
and V
OUT
should be constrained to the range GND≤(V
IN
or
V
OUT
)≤V
CC
.
Unused inputs must always be tied to an appropriate logic voltage level (e.g., either GND or V
CC
). Unused
outputs must be left open.
INTEGRAL
2
IN74LV138
DC ELECTRICAL CHARACTERISTICS
Symbol
Parameter
Test
Conditions
V
CC
,
Â
25°C
min
V
IH
High-level input
voltage
1.2
2.0
2.7 to 3.6
4.5 to 5.5
1.2
2.0
2.7 to 3.6
4.5 to 5.5
-I
0
=100µA
V
IH
or V
IL
1.2
2.0
2.7
3.0
3.6
4.5
5.5
3.0
4.5
1.2
2.0
3.0
3.0
4.5
5.5
5.5
0.9
1.4
2.0
0.7 Vcc
-
-
-
-
-
1.85
2.55
2.85
3.45
4.35
5.35
2.48
3.70
-
-
-
-
-
max
-
-
-
-
0.3
0.6
0.8
0.3 Vcc
-
-
-
-
-
-
-
-
Guaranteed Limit
îò -40°C to
85°C
min
0.9
1.4
2.0
0.7 Vcc
-
-
-
-
-
1.8
2.5
2.8
3.4
4.3
5.3
2.40
3.60
-
-
-
-
-
max
-
-
-
-
0.3
0.6
0.8
0.3 Vcc
-
-
-
-
-
-
-
-
îò -40°C to
125°C
min
0.9
1.4
2.0
0.7 Vcc
-
-
-
-
-
1.8
2.5
2.8
3.4
4.3
5.3
2.20
3.50
-
-
-
-
-
max
-
-
-
-
0.3
0.6
0.8
0.3 Vcc
-
-
-
-
-
-
-
-
Â
Unit
V
IL
Low -level input
voltage
Â
V
OH
High-level
output voltage
Â
V
IH
or V
IL
-I
O=
6.0 mA
-I
O=
12.0 mA
V
OL
Low-level output V
IH
or V
IL
voltage
I
0
=100µA
B
0.15
0.15
0.15
0.33
0.40
±0.1
8.0
0.2
0.2
0.2
0.40
0.55
±1.0
80
0.2
0.2
0.2
0.50
0.65
±1.0
160
B
V
IH
or V
IL
I
O=
6.0 mA
I
O=
12.0 mA
I
I
I
CC
Input leakage
current
Quiescent
supply current
V
CC
or GND
V
CC
or GND
I
O
=0
B
-
-
-
-
-
-
ìêÀ
ìêÀ
INTEGRAL
3
IN74LV138
AC ELECTRICAL CHARACTERISTICS
(C
L
=50 pF, t
LH
= t
HL
= 2.5 nc, V
IL
=0B, V
IH
=V
CC
)
Symbol
Parameter
V
CC
V
25°C
min
t
PLH
, t
PHL
Propagation delay,
input A to output Y
(Figures 1)
1.2
2.0
2.7
3.0
4.5
1.2
2.0
2.7
3.0
4.5
-
max
150
33
23
19
14
170
35
26
21
17
170
35
26
21
17
7.0
Guaranteed Limit
îò -40°C to
85°C
min
-
max
150
36
26
21
16
170
39
29
23
19
170
39
29
23
19
îò -40°C to
125°C
min
-
max
180
44
33
26
20
200
49
36
29
24
200
49
36
29
24
ns
Unit
t
PLH
, t
PHL
Propagation delay ,
CS1 to
output Y
(Figures 2)
Output transition
time, CS2 or CS3 to
output Y (Figures 3)
-
-
-
ns
t
PLH
, t
PHL
-
-
-
ns
C
IN
Input capacitance
5.0
Ò=+25
î
Ñ
pF
Power dissipation capacitance (per enabled
output)
C
PD
Used to determine the no-load dynamic power
consumption:
P
D
=C
PD
V
CC2
f+I
CC
V
CC
Typical @25°C,V
CC
=5.5 V
90
pF
t
r
INPUT
A
Vcc
50%
GND
OUTPUT
Y
INPUT
CS1
90%
50%
10%
t
f
Vcc
GND
t
PHL
OUTPUT
Y
50%
t
PLH
t
PHL
90%
50%
10%
t
PLH
Figure 1. Switching Waveforms
Figure 2. Switching Waveforms
INTEGRAL
4
IN74LV138
t
r
INPUT
CS2,CS3
90%
50%
10%
Vcc
GND
DEVICE
UNDER
TEST
OUTPUT
C
*
TEST POINT
t
PHL
OUTPUT
Y
90%
50%
10%
t
PLH
L
* Includes all prode and jig capacitance
Figure 3. Switching Waveforms
Figure 4. Test Circuit
EXPANDED LOGIC DIAGRAM
INTEGRAL
5
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