Philips Semiconductors
Product specification
3-to-8 line decoder/demultiplexer; inverting
74LV138
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,
•
Typical V
OHV
(output V
OH
undershoot) > 2 V at V
CC
= 3.3 V,
•
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
QUICK REFERENCE DATA
GND = 0 V; T
amb
= 25°C; t
r
= t
f
≤
2.5 ns
SYMBOL
t
PHL
/t
PLH
C
I
C
PD
PARAMETER
Propagation delay
An to Yn,
E3 to Yn, En to Yn
Input capacitance
Power dissipation capacitance per
package
T
amb
= 25°C
T
amb
= 25°C
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.
CONDITIONS
C
L
= 15 pF;
V
CC
= 3.3 V
TYPICAL
12
14
3.5
UNIT
ns
ns
pF
pF
V
CC
= 3.3 V
V
I
= GND to V
CC1
45
NOTES:
1. C
PD
is used to determine the dynamic power dissipation (P
D
in
µW)
P
D
= C
PD
×
V
CC2
×
f
i
)
(C
L
×
V
CC2
×
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
CC2
×
f
o
) = sum of the outputs.
ORDERING INFORMATION
PACKAGES
16-Pin Plastic DIL
16-Pin Plastic SO
16-Pin Plastic SSOP Type II
16-Pin Plastic TSSOP Type I
TEMPERATURE RANGE
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
OUTSIDE NORTH AMERICA
74LV138 N
74LV138 D
74LV138 DB
74LV138 PW
NORTH AMERICA
74LV138 N
74LV138 D
74LV138 DB
74LV138PW DH
PKG. DWG. #
SOT38-4
SOT109-1
SOT338-1
SOT403-1
PIN CONFIGURATION
A
0
A
1
A
2
E
1
E
2
E
3
Y
7
GND
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V
CC
Y
0
Y
1
Y
2
Y
3
Y
4
Y
5
Y
6
PIN DESCRIPTION
PIN NUMBER
1, 2, 3
4, 5
6
SYMBOL
A
0
to A
2
E
1
to E
2
E
3
FUNCTION
Address inputs
Enable inputs (active LOW)
Enable inputs (active HIGH)
Outputs
Ground (0 V)
Positive supply voltage
15, 14, 13, 12,
Y
0 to
Y
7
11, 10, 9, 7
8
16
GND
V
CC
SV00524
1998 Apr 28
2
853–1903 19290
Philips Semiconductors
Product specification
3-to-8 line decoder/demultiplexer; inverting
74LV138
RECOMMENDED OPERATING CONDITIONS
SYMBOL
V
CC
V
I
V
O
T
amb
PARAMETER
DC supply voltage
Input voltage
Output voltage
Operating ambient temperature range in free air
See DC and AC
characteristics
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
CONDITIONS
See Note 1
MIN
1.0
0
0
–40
–40
–
–
–
–
–
–
–
–
TYP
3.3
–
–
MAX
5.5
V
CC
V
CC
+85
+125
500
200
100
50
UNIT
V
V
V
°C
t
r
, t
f
Input rise and fall times
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
V
CC
"I
IK
"I
OK
"I
O
"I
GND
,
"I
CC
T
stg
PARAMETER
DC supply voltage
DC input diode current
DC output diode current
DC output source or sink current
– standard outputs
DC V
CC
or GND current for types with
– standard outputs
Storage temperature range
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
V
I
< –0.5 or V
I
> V
CC
+ 0.5V
V
O
< –0.5 or V
O
> V
CC
+ 0.5V
–0.5V < V
O
< V
CC
+ 0.5V
CONDITIONS
RATING
–0.5 to +7.0
20
50
25
UNIT
V
mA
mA
mA
50
–65 to +150
750
500
400
mA
°C
P
TOT
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.
1998 Apr 28
4
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