1/9
July 2001
s
HIGH SPEED :
t
PD
= 5.5ns (TYP.) at V
CC
= 3.3V
s
5V TOLERANT INPUTS
s
INPUT VOLTAGE LEVEL :
V
IL
=0.8V, V
IH
=2V at V
CC
=3V
s
LOW POWER DISSIPATION:
I
CC
= 4
A (MAX.) at T
A
=25C
s
LOW NOISE:
V
OLP
= 0.3V (TYP.) at V
CC
= 3.3V
s
SYMMETRICAL OUTPUT IMPEDANCE:
|I
OH
| = I
OL
= 4mA (MIN)
s
BALANCED PROPAGATION DELAYS:
t
PLH
t
PHL
s
OPERATING VOLTAGE RANGE:
V
CC
(OPR) = 2V to 3.6V (1.2V Data Retention)
s
PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 138
s
IMPROVED LATCH-UP IMMUNITY
s
POWER DOWN PROTECTION ON INPUTS
DESCRIPTION
The 74LVX138 is a low voltage CMOS 3 TO 8
LINE DECODER (INVERTING) fabricated with
sub-micron silicon gate and double-layer metal
wiring C
2
MOS technology. It is ideal for low
power, battery operated and low noise 3.3V
applications.
If the device is enabled, 3 binary select (A, B, and
C) determine which one of the outputs will go low.
If enable input G1 is held low or either G2A or G2B
is held high, the decoding function is inhibited and
all the 8 outputs go to high.
Tree enable inputs are provided to ease cascade
connection and application of address decoders
for memory systems.
Power down protection is provided on all inputs
and 0 to 7V can be accepted on inputs with no
regard to the supply voltage.
This device can be used to interface 5V to 3V
system. It combines high speed performance with
the true CMOS low power consumption.
All inputs and outputs are equipped with
protection circuits against static discharge, giving
them 2KV ESD immunity and transient excess
voltage.
74LVX138
LOW VOLTAGE CMOS 3 TO 8 LINE DECODER (INV.)
WITH 5V TOLERANT INPUTS
PIN CONNECTION AND IEC LOGIC SYMBOLS
ORDER CODES
PACKAGE
TUBE
T & R
SOP
74LVX138M
74LVX138MTR
TSSOP
74LVX138TTR
TSSOP
SOP
74LVX138
2/9
INPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
TRUTH TABLE
X : Don't Care
LOGIC DIAGRAM
This logic diagram has not be used to estimate propagation delays
PIN No
SYMBOL
NAME AND FUNCTION
1, 2, 3
A, B, C
Address Inputs
4, 5
G2A, G2B
Enable Inputs
6
G1
Enable Input
15, 14, 13,
12, 11, 10, 9,
7
Y0 to Y7
Outputs
8
GND
Ground (0V)
16
V
CC
Positive Supply Voltage
INPUTS
OUTPUTS
ENABLE
SELECT
G2B
G2A
G1
C
B
A
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
X
X
L
X
X
X
H
H
H
H
H
H
H
H
X
H
X
X
X
X
H
H
H
H
H
H
H
H
H
X
X
X
X
X
H
H
H
H
H
H
H
H
L
L
H
L
L
L
L
H
H
H
H
H
H
H
L
L
H
L
L
H
H
L
H
H
H
H
H
H
L
L
H
L
H
L
H
H
L
H
H
H
H
H
L
L
H
L
H
H
H
H
H
L
H
H
H
H
L
L
H
H
L
L
H
H
H
H
L
H
H
H
L
L
H
H
L
H
H
H
H
H
H
L
H
H
L
L
H
H
H
L
H
H
H
H
H
H
L
H
L
L
H
H
H
H
H
H
H
H
H
H
H
L
74LVX138
3/9
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is
not implied.
RECOMMENDED OPERATING CONDITIONS
1) Truth Table guaranteed: 1.2V to 3.6V
2) V
IN
from 0.8V to 2.0V
DC SPECIFICATIONS
Symbol
Parameter
Value
Unit
V
CC
Supply Voltage
-0.5 to +7.0
V
V
I
DC Input Voltage
-0.5 to +7.0
V
V
O
DC Output Voltage
-0.5 to V
CC
+ 0.5
V
I
IK
DC Input Diode Current
- 20
mA
I
OK
DC Output Diode Current
20
mA
I
O
DC Output Current
25
mA
I
CC
or I
GND
DC V
CC
or Ground Current
50
mA
T
stg
Storage Temperature
-65 to +150
C
T
L
Lead Temperature (10 sec)
300
C
Symbol
Parameter
Value
Unit
V
CC
Supply Voltage (note 1)
2 to 3.6
V
V
I
Input Voltage
0 to 5.5
V
V
O
Output Voltage
0 to V
CC
V
T
op
Operating Temperature
-55 to 125
C
dt/dv
Input Rise and Fall Time (note 2) (V
CC
= 3.3V)
0 to 100
ns/V
Symbol
Parameter
Test Condition
Value
Unit
V
CC
(V)
T
A
= 25C
-40 to 85C
-55 to 125C
Min.
Typ.
Max.
Min.
Max.
Min.
Max.
V
IH
High Level Input
Voltage
2.0
1.5
1.5
1.5
V
3.0
2.0
2.0
2.0
3.6
2.4
2.4
2.4
V
IL
Low Level Input
Voltage
2.0
0.5
0.5
0.5
V
3.0
0.8
0.8
0.8
3.6
0.8
0.8
0.8
V
OH
High Level Output
Voltage
2.0
I
O
=-50
A
1.9
2.0
1.9
1.9
V
3.0
I
O
=-50
A
2.9
3.0
2.9
2.9
3.0
I
O
=-4 mA
2.58
2.48
2.4
V
OL
Low Level Output
Voltage
2.0
I
O
=50
A
0.0
0.1
0.1
0.1
V
3.0
I
O
=50
A
0.0
0.1
0.1
0.1
3.0
I
O
=4 mA
0.36
0.44
0.55
I
I
Input Leakage
Current
3.6
V
I
= 5V or GND
0.1
1
1
A
I
CC
Quiescent Supply
Current
3.6
V
I
= V
CC
or GND
4
40
40
A
74LVX138
4/9
DYNAMIC SWITCHING CHARACTERISTICS
1) Worst case package.
2) Max number of outputs defined as (n). Data inputs are driven 0V to 3.3V, (n-1) outputs switching and one output at GND.
3) Max number of data inputs (n) switching. (n-1) switching 0V to 3.3V. Inputs under test switching: 3.3V to threshold (V
ILD
), 0V to threshold
(V
IHD
), f=1MHz.
AC ELECTRICAL CHARACTERISTICS (Input t
r
= t
f
= 3ns)
1) Skew is defined as the absolute value of the difference between the actual propagation delay for any two outputs of the same device switch-
ing in the same direction, either HIGH or LOW
2) Parameter guaranteed by design
(*) Voltage range is 3.3V
0.3V
Symbol
Parameter
Test Condition
Value
Unit
V
CC
(V)
T
A
= 25C
-40 to 85C
-55 to 125C
Min.
Typ.
Max.
Min.
Max.
Min.
Max.
V
OLP
Dynamic Low
Voltage Quiet
Output (note 1, 2)
3.3
C
L
= 50 pF
0.3
0.5
V
V
OLV
-0.5
-0.3
V
IHD
Dynamic High
Voltage Input (note
1, 3)
3.3
2
V
ILD
Dynamic Low
Voltage Input (note
1, 3)
3.3
0.8
Symbol
Parameter
Test Condition
Value
Unit
V
CC
(V)
C
L
(pF)
T
A
= 25C
-40 to 85C
-55 to 125C
Min.
Typ.
Max.
Min.
Max.
Min.
Max.
t
PLH
t
PHL
Propagation Delay
Time
A, B, C to Y
2.7
15
7.1
13.8
1.0
16.5
1.0
18.5
ns
2.7
50
9.6
17.3
1.0
20.0
1.0
22.0
3.3
(*)
15
5.5
8.8
1.0
10.5
1.0
11.5
3.3
(*)
50
8.0
12.3
1.0
14.0
1.0
15.0
t
PLH
t
PHL
Propagation Delay
Time
G1 to Y
2.7
15
8.7
16.3
1.0
19.5
1.0
205
ns
2.7
50
11.2
19.8
1.0
23.0
1.0
25.0
3.3
(*)
15
6.8
10.6
1.0
12.5
1.0
13.5
3.3
(*)
50
9.3
14.1
1.0
16.0
1.0
17.0
t
PLH
t
PHL
Propagation Delay
Time
G2A or G2B to Y
2.7
15
8.8
16.0
1.0
18.5
1.0
19.5
ns
2.7
50
11.3
19.5
1.0
22.0
1.0
23.0
3.3
(*)
15
6.9
10.4
1.0
11.5
1.0
13.5
3.3
(*)
50
9.4
13.9
1.0
15.0
1.0
17.0
t
OSLH
t
OSHL
Output To Output
Skew Time (note1,
2)
2.7
50
0.5
1.0
1.5
1.5
ns
3.3
(*)
50
0.5
1.0
1.5
1.5
74LVX138
5/9
CAPACITIVE CHARACTERISTICS
1) C
PD
is defined as the value of the IC's internal equivalent capacitance which is calculated from the operating current consumption without
load. (Refer to Test Circuit). Average operating current can be obtained by the following equation. I
CC(opr)
= C
PD
x V
CC
x f
IN
+ I
CC
TEST CIRCUIT
C
L
=15/50pF or equivalent (includes jig and probe capacitance)
R
T
= Z
OUT
of pulse generator (typically 50
)
Symbol
Parameter
Test Condition
Value
Unit
V
CC
(V)
T
A
= 25C
-40 to 85C
-55 to 125C
Min.
Typ.
Max.
Min.
Max.
Min.
Max.
C
IN
Input Capacitance
3.3
4
10
10
pF
C
PD
Power Dissipation
Capacitance
(note 1)
3.3
f
IN
= 10MHz
34
pF
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