1/9July 2001
■ HIGH SPEED :
t
PD
= 5.5ns (TYP.) at V
CC
= 3.3V
■ 5V TOLERANT INPUTS
■ INPUT VOLTAGE LEVEL :
V
IL
=0.8V , VIH=2V at VCC=3V
■ LOW POWER DISSIPATION:
I
CC
= 4 µA (MAX.) at TA=25°C
■ LOW NOISE:
V
OLP
= 0.3V (TYP.) at VCC = 3.3V
■ SYMMETRICAL OUTPUT IMPEDANCE:
|I
OH
| = IOL = 4mA (MIN)
■ BALANCED PROPAGATION DELAYS:
t
PLH
≅ t
PHL
■ OPERATING VOL TAGE RANGE:
V
CC
(OPR) = 2V to 3.6V (1.2V Data Retention)
■ PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 138
■ IMPROVED LATCH-UP IMMUNITY
■ 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 inpu ts 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 stat ic 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
TSSOPSOP
74LVX138
2/9
INPUT EQUIVALENT CIRCUIT PIN DESCRIPTION
TRUTH TABLE
X : Don’t Care
LOGIC DIAGRAM
This log i c diagram has not be used to esti m at e 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, 1 1, 10, 9,
7
Y0
to Y7 Outputs
8 GND Ground (0V)
16 V
CC
Positive Supply Voltage
INPUTS
OUTPUTS
ENABLE SELECT
G2B
G2A G1CBAY0Y1 Y2 Y3 Y4 Y5 Y6 Y7
XXLXXXHHHHHHHH
XHXXXXHHHHHHHH
HXXXXXHHHHHHHH
LLHLLLLHHHHHHH
LLHLLHHLHHHHHH
LLHLHLHHLHHHHH
LLHLHHHHHLHHHH
LLHHLLHHHHLHHH
LLHHLHHHHHHLHH
LLHHHLHHHHHHLH
LLHHHHHHHHHHHL
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 T abl e guarante ed: 1.2V to 3.6 V
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 VCC + 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 VCC 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
= 25°C
-40 to 85°C -55 to 125°C
Min. Typ. Max. Min. Max. Min. Max.
V
IH
High Level Input
Voltage
2.0 1.5 1.5 1.5
V3.0 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
V3.0 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 µA
1.9 2.0 1.9 1.9
V3.0
I
O
=-50 µA
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 µA
0.0 0.1 0.1 0.1
V3.0
I
O
=50 µA
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 µA
I
CC
Quiescent Supply
Current
3.6
V
I
= VCC or GND
44040µA
74LVX138
4/9
DYNAMIC SWITCHING CHARACTERISTICS
1) Worst c ase package .
2) Max number of outp ut s 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 tr = tf = 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 switching in the same direction, either HI GH or LOW
2) Param eter guaran teed by design
(*) Vol tage range is 3.3V ±
0.3V
Symbol Parameter
Test Condition Value
Unit
V
CC
(V)
T
A
= 25°C
-40 to 85°C -55 to 125°C
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
= 25°C
-40 to 85°C -55 to 125°C
Min. Typ. Max. Min. Max. Min. Max.
t
PLH tPHL
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 tPHL
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 tPHL
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) CPD is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without
load. (R ef er to Test Circ ui t). Averag e operating current can be obtained by t he following equation. I
CC(opr)
= CPD x VCC x f
IN
+ I
CC
TEST CIRCUIT
CL =15/50pF or equivalent (i ncludes jig and probe cap acitance)
R
T
= Z
OUT
of pulse generator (typically 50Ω)
Symbol Parameter
Test Condition Value
Unit
V
CC
(V)
T
A
= 25°C
-40 to 85°C -55 to 125°C
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
74LVX138
6/9
WAVEFORM 1: PROPAGATION DELAYS FOR INVERTING OUTPUTS (f=1MHz; 50% duty cycle)
WAVEFORM 2: PROPAGATION DELAYS FOR NON-INVERTING OUTPUTS (f=1MHz; 50% duty cycle)
74LVX138
7/9
DIM.
mm. inch
MIN. TYP MAX. MIN. TYP. MAX.
A 1.75 0.068
a1 0.1 0.2 0.003 0.007
a2 1.65 0.064
b 0.35 0.46 0.013 0.018
b1 0.19 0.25 0.007 0.010
C 0.5 0.019
c1 45° (typ.)
D 9.8 10 0.385 0.393
E 5.8 6.2 0.228 0.244
e 1.27 0.050
e3 8.89 0.350
F 3.8 4.0 0.149 0.157
G 4.6 5.3 0.181 0.208
L 0.5 1.27 0.019 0.050
M 0.62 0.024
S8° (max.)
SO-16 MECHANICAL DATA
PO13H
74LVX138
8/9
DIM.
mm. inch
MIN. TYP MAX. MIN. TYP. M AX.
A 1.2 0.047
A1 0.05 0.15 0.002 0.004 0.006
A2 0.8 1 1.05 0.031 0.039 0.041
b 0.19 0.30 0.007 0.012
c 0.09 0.20 0.004 0.0089
D 4.9 5 5.1 0.193 0.197 0.201
E 6.2 6.4 6.6 0.244 0.252 0.260
E1 4.3 4.4 4.48 0.169 0.173 0.176
e 0.65 BSC 0.0256 BSC
K0° 8°0° 8°
L 0.45 0.60 0.75 0.018 0.024 0.030
TSSOP16 MECHANICAL DATA
c
E
b
A2
A
E1
D
1
PIN 1 IDENTIFICATION
A1
L
K
e
0080338D
74LVX138
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mentioned in this publication ar e subject to change without notice. This publication supersedes and replaces all information
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