Philips Semiconductors
Product specification
74LV138
3-to-8 line decoder/demultiplexer; inverting
2
1998 Apr 28
8531903 19290
FEATURES
Wide operating voltage: 1.0 to 5.5 V
Optimized for low voltage applications: 1.0 to 3.6 V
Accepts TTL input levels between V
CC
= 2.7 V and V
CC
= 3.6 V
Typical V
OLP
(output ground bounce) < 0.8 V at V
CC
= 3.3 V,
T
amb
= 25
C
Typical V
OHV
(output V
OH
undershoot) > 2 V at V
CC
= 3.3 V,
T
amb
= 25
C
Demultiplexing capability
Multiple input enable for easy expansion
Ideal for memory chip select decoding
Active LOW mutually exclusive outputs
Output capability: standard
I
CC
category: MSI
DESCRIPTION
The 74LV138 is a low-voltage Si-gate CMOS device that is pin and
function compatible with 74HC/HCT138.
The 74LV138 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 74LV138 features three enable inputs: two active LOW (E
1
, and
E
2
) and one active HIGH (E
3
). Every output 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
74LV138 to a 1-of-32 (5 lines to 32 lines) decoder with just four
74LV138 ICs and one inverter. The 74LV138 can be used as an
eight output demultiplexer by using one of the active LOW enable
inputs as the data input and the remaining enable inputs as strobes.
Unused enable inputs must be permanently tied to their appropriate
active HIGH or LOW state. The 74LV138 is identical to the 74LV238
but has non-inverting (true) outputs.
QUICK REFERENCE DATA
GND = 0 V; T
amb
= 25
C; t
r
= t
f
2.5 ns
SYMBOL
PARAMETER
CONDITIONS
TYPICAL
UNIT
t
PHL
/t
PLH
Propagation delay
An to Yn,
E3 to Yn, En to Yn
C
L
= 15 pF;
V
CC
= 3.3 V
12
14
ns
ns
C
I
Input capacitance
3.5
pF
C
PD
Power dissipation capacitance per
package
V
CC
= 3.3 V
V
I
= GND to V
CC
1
45
pF
NOTES:
1. C
PD
is used to determine the dynamic power dissipation (P
D
in
W)
P
D
= C
PD
V
CC
2
f
i
)
(C
L
V
CC
2
f
o
) where:
f
i
= input frequency in MHz; C
L
= output load capacitance in pF;
f
o
= output frequency in MHz; V
CC
= supply voltage in V;
(C
L
V
CC
2
f
o
) = sum of the outputs.
ORDERING INFORMATION
PACKAGES
TEMPERATURE RANGE
OUTSIDE NORTH AMERICA
NORTH AMERICA
PKG. DWG. #
16-Pin Plastic DIL
40
C to +125
C
74LV138 N
74LV138 N
SOT38-4
16-Pin Plastic SO
40
C to +125
C
74LV138 D
74LV138 D
SOT109-1
16-Pin Plastic SSOP Type II
40
C to +125
C
74LV138 DB
74LV138 DB
SOT338-1
16-Pin Plastic TSSOP Type I
40
C to +125
C
74LV138 PW
74LV138PW DH
SOT403-1
PIN CONFIGURATION
SV00524
1
2
3
4
5
6
7
A
0
A
1
A
2
E
1
E
2
E
3
Y
7
V
CC
Y
0
Y
1
Y
2
Y
3
Y
4
Y
5
14
13
12
11
10
9
GND
Y
6
8
16
15
PIN DESCRIPTION
PIN NUMBER
SYMBOL
FUNCTION
1, 2, 3
A
0
to A
2
Address inputs
4, 5
E
1
to E
2
Enable inputs (active LOW)
6
E
3
Enable inputs (active HIGH)
15, 14, 13, 12,
11, 10, 9, 7
Y
0 to
Y
7
Outputs
8
GND
Ground (0 V)
16
V
CC
Positive supply voltage
Philips Semiconductors
Product specification
74LV138
3-to-8 line decoder/demultiplexer; inverting
1998 Apr 28
4
RECOMMENDED OPERATING CONDITIONS
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNIT
V
CC
DC supply voltage
See Note 1
1.0
3.3
5.5
V
V
I
Input voltage
0
V
CC
V
V
O
Output voltage
0
V
CC
V
T
amb
Operating ambient temperature range in free air
See DC and AC
characteristics
40
40
+85
+125
C
t
r
, t
f
Input rise and fall times
V
CC
= 1.0V to 2.0V
V
CC
= 2.0V to 2.7V
V
CC
= 2.7V to 3.6V
V
CC
= 3.6V to 5.5V
500
200
100
50
ns/V
NOTE:
1. The LV is guaranteed to function down to V
CC
= 1.0V (input levels GND or V
CC
); DC characteristics are guaranteed from V
CC
= 1.2V to V
CC
= 5.5V.
ABSOLUTE MAXIMUM RATINGS
1, 2
In accordance with the Absolute Maximum Rating System (IEC 134).
Voltages are referenced to GND (ground = 0 V).
SYMBOL
PARAMETER
CONDITIONS
RATING
UNIT
V
CC
DC supply voltage
0.5 to +7.0
V
"
I
IK
DC input diode current
V
I
< 0.5 or V
I
> V
CC
+ 0.5V
20
mA
"
I
OK
DC output diode current
V
O
< 0.5 or V
O
> V
CC
+ 0.5V
50
mA
"
I
O
DC output source or sink current
standard outputs
0.5V < V
O
< V
CC
+ 0.5V
25
mA
"
I
GND
,
"
I
CC
DC V
CC
or GND current for types with
standard outputs
50
mA
T
stg
Storage temperature range
65 to +150
C
P
TOT
Power dissipation per package
plastic DIL
plastic mini-pack (SO)
plastic shrink mini-pack (SSOP and TSSOP)
for temperature range: 40 to +125
C
above +70
C derate linearly with 12 mW/K
above +70
C derate linearly with 8 mW/K
above +60
C derate linearly with 5.5 mW/K
750
500
400
mW
NOTES:
1. Stresses beyond those listed may cause permanent damage to the device. These are stress ratings only and functional operation of the
device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to
absolute-maximum-rated conditions for extended periods may affect device reliability.
2. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
Philips Semiconductors
Product specification
74LV138
3-to-8 line decoder/demultiplexer; inverting
1998 Apr 28
5
DC ELECTRICAL CHARACTERISTICS
Over recommended operating conditions. Voltages are referenced to GND (ground = 0 V).
LIMITS
SYMBOL
PARAMETER
TEST CONDITIONS
-40
C to +85
C
-40
C to +125
C
UNIT
MIN
TYP
1
MAX
MIN
MAX
V
CC
= 1.2 V
0.9
0.9
V
HIGH level Input
V
CC
= 2.0 V
1.4
1.4
V
V
IH
voltage
V
CC
= 2.7 to 3.6 V
2.0
2.0
V
V
CC
= 4.5 to 5.5 V
0.7
<
V
CC
0.7
<
V
CC
V
CC
= 1.2 V
0.3
0.3
V
LOW level Input
V
CC
= 2.0 V
0.6
0.6
V
V
IL
voltage
V
CC
= 2.7 to 3.6 V
0.8
0.8
V
V
CC
= 4.5 to 5.5
0.3
<
V
CC
0.3
<
V
CC
V
CC
= 1.2 V; V
I
= V
IH
or V
IL;
I
O
= 100
A
1.2
HIGH l
l
t
t
V
CC
= 2.0 V; V
I
= V
IH
or V
IL;
I
O
= 100
A
1.8
2.0
1.8
V
OH
HIGH level output
voltage; all outputs
V
CC
= 2.7 V; V
I
= V
IH
or V
IL;
I
O
= 100
A
2.5
2.7
2.5
V
voltage all out uts
V
CC
= 3.0 V; V
I
= V
IH
or V
IL;
I
O
= 100
A
2.8
3.0
2.8
V
CC
= 4.5 V; V
I
= V
IH
or V
IL;
I
O
= 100
A
4.3
4.5
4.3
V
O
HIGH level output
voltage;
V
CC
= 3.0 V; V
I
= V
IH
or V
IL;
I
O
= 6mA
2.40
2.82
2.20
V
V
OH
g
STANDARD
outputs
V
CC
= 4.5 V; V
I
= V
IH
or V
IL;
I
O
= 12mA
3.60
4.20
3.50
V
V
CC
= 1.2 V; V
I
= V
IH
or V
IL;
I
O
= 100
A
0
LOW l
l
t
t
V
CC
= 2.0 V; V
I
= V
IH
or V
IL;
I
O
= 100
A
0
0.2
0.2
V
OL
LOW level output
voltage; all outputs
V
CC
= 2.7 V; V
I
= V
IH
or V
IL;
I
O
= 100
A
0
0.2
0.2
V
voltage all out uts
V
CC
= 3.0 V; V
I
= V
IH
or V
IL;
I
O
= 100
A
0
0.2
0.2
V
CC
= 4.5 V; V
I
= V
IH
or V
IL;
I
O
= 100
A
0
0.2
0.2
V
O
LOW level output
voltage;
V
CC
= 3.0 V; V
I
= V
IH
or V
IL;
I
O
= 6mA
0.25
0.40
0.50
V
V
OL
g
STANDARD
outputs
V
CC
= 4.5 V; V
I
= V
IH
or V
IL;
I
O
= 12mA
0.35
0.55
0.65
V
I
I
Input leakage
current
V
CC
= 5.5 V; V
I
= V
CC
or GND
1.0
1.0
A
I
CC
Quiescent supply
current; MSI
V
CC
= 5.5 V; V
I
= V
CC
or GND; I
O
= 0
20.0
160
A
I
CC
Additional
quiescent supply
current per input
V
CC
= 2.7 V to 3.6 V; V
I
= V
CC
0.6 V
500
850
A
NOTE:
1. All typical values are measured at T
amb
= 25
C.
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