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Электронный компонент: IN74LV138N

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TECHNICAL DATA
1
INTEGRAL
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
N SUFFIX
PLASTIC
D SUFFIX
SOIC
1
16
1
16
ORDERING INFORMATION
IN74LV138N Plastic
IN74LV138D SOIC
T
A
= -40
to 125
C for all packages
IN74LV138
PIN ASSIGNMENT
LOGIC DIAGRAM
PIN 16 =V
CC
PIN 8 = GND
FUNCTION TABLE
Inputs
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 L L
H L L
H L L
H L L
L L L
L L H
L H L
L 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 L L
H L L
H L L
H L L
H L L
H L H
H H L
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 = high level (steady state)
L = low level (steady state)
X = don't care
IN74LV138
2
INTEGRAL
MAXIMUM RATINGS
*
Symbol
Parameter
Value
Conditions
Unit
V
CC
DC supply voltage
-0.5 to +7.0
V
I
IK
DC input diode current
20
V
I
<
- 0.5 or V
I
>
Vcc+0.5V
mA
I
OK
DC output diode current
50
V
O
<
- 0.5 or V
O
>
Vcc+0.5V
mA
I
O
DC output source or sink current
25
-0.5<Vo<Vcc+0.5B
mA
I
CC
DC V
CC
or GND current for types with
standard outputs
50
mA
Tstg
Storage Temperature
-65 to +150
C
P
D
Power Dissipation per package
Plastic DIP+
SOIC Package+
750
500
mW
T
L
Lead temperature, 1.5 mm from Case for 4
seconds
(Plastic DIP ), 0.3 mm (SOIC Package)
260
C
*
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
Parameter
Min
Max
Unit
V
CC
DC supply voltage
1.0
5.5
V
V
IN
,
DC input voltage,
0
V
CC
V
V
O
DC output voltage
0
V
CC
V
T
A
Operating ambient temperature range in free air
-40
+125
C
t
r
, t
f
Input rise and fall times except for
Schmitt-trigger inputs
Vcc= 1.0
?
2.0
Vcc= 2.0
?
2.7
Vcc= 2.7
?
3.6
Vcc= 3.6
?
5.5
0
0
0
500
200
100
50
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.
IN74LV138
3
INTEGRAL
DC ELECTRICAL CHARACTERISTICS
Symbol
Parameter
Test
Conditions
V
CC
,
Guaranteed Limit
Unit
25
C
-40
C to
85
C
-40
C to
125
C
min
max
min
max
min
max
V
IH
High-level input
voltage
1.2
2.0
2.7 to 3.6
4.5 to 5.5
0.9
1.4
2.0
0.7 Vcc
-
-
-
-
0.9
1.4
2.0
0.7 Vcc
-
-
-
-
0.9
1.4
2.0
0.7 Vcc
-
-
-
-
V
IL
Low -level input
voltage
1.2
2.0
2.7 to 3.6
4.5 to 5.5
-
-
-
-
0.3
0.6
0.8
0.3 Vcc
-
-
-
-
0.3
0.6
0.8
0.3 Vcc
-
-
-
-
0.3
0.6
0.8
0.3 Vcc
V
OH
High-level
output voltage
-I
0
=100
A
V
IH
or V
IL
1.2
2.0
2.7
3.0
3.6
4.5
5.5
-
1.85
2.55
2.85
3.45
4.35
5.35
-
-
-
-
-
-
-
-
1.8
2.5
2.8
3.4
4.3
5.3
-
-
-
-
-
-
-
-
1.8
2.5
2.8
3.4
4.3
5.3
-
-
-
-
-
-
-
V
IH
or V
IL
-I
O=
6.0 mA
-I
O=
12.0 mA
3.0
4.5
2.48
3.70
-
2.40
3.60
-
2.20
3.50
-
B
V
OL
Low-level output
voltage
V
IH
or V
IL
I
0
=100
A
1.2
2.0
3.0
-
-
-
-
0.15
0.15
0.15
-
-
-
-
0.2
0.2
0.2
-
-
-
-
0.2
0.2
0.2
B
V
IH
or V
IL
I
O=
6.0 mA
I
O=
12.0 mA
3.0
4.5
-
0.33
0.40
-
0.40
0.55
-
0.50
0.65
B
I
I
Input leakage
current
V
CC
or GND
5.5
-
0.1
-
1.0
-
1.0
I
CC
Quiescent
supply current
V
CC
or GND
I
O
=0
5.5
-
8.0
-
80
-
160
IN74LV138
4
INTEGRAL
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
Guaranteed Limit
Unit
V
25
C
-40
C to
85
C
-40
C to
125
C
min
max
min
max
min
max
t
PLH
, t
PHL
Propagation delay,
input A to output Y
(Figures 1)
1.2
2.0
2.7
3.0
4.5
-
150
33
23
19
14
-
150
36
26
21
16
-
180
44
33
26
20
ns
t
PLH
, t
PHL
Propagation delay ,
CS1 to
output Y
(Figures 2)
1.2
2.0
2.7
3.0
4.5
-
170
35
26
21
17
-
170
39
29
23
19
-
200
49
36
29
24
ns
t
PLH
, t
PHL
Output transition
time, CS2 or CS3 to
output Y (Figures 3)
-
170
35
26
21
17
-
170
39
29
23
19
-
200
49
36
29
24
ns
C
IN
Input capacitance
5.0
=+25
7.0
pF
Power dissipation capacitance (per enabled
output)
Typical @25
C,V
CC
=5.5 V
C
PD
Used to determine the no-load dynamic power
consumption:
P
D
=C
PD
V
CC
2
f+I
CC
V
CC
90
pF
Figure 1. Switching Waveforms Figure 2. Switching Waveforms
INPUT
A
GND
OUTPUT
Y
t
PHL
t
PLH
Vcc
50%
50%
INPUT
CS1
GND
OUTPUT
Y
t
PHL
t
PLH
Vcc
90%
90%
50%
10%
10%
50%
t
r
t
f
IN74LV138
5
INTEGRAL

Figure 3. Switching Waveforms
Figure 4. Test Circuit
EXPANDED LOGIC DIAGRAM
INPUT
CS2,CS3
GND
OUTPUT
Y
t
PHL
t
PLH
Vcc
90%
90%
50%
10%
10%
50%
t
r
DEVICE
OUTPUT
TEST POINT
* Includes all prode and jig capacitance
C
*
L
UNDER
TEST