SGS Thomson Microelectronics 74LVX238TTR, 74LVX238MTR, 74LVX238M Datasheet
74LVX238
LOW VOLTAGE CMOS 3 TO 8 LINE DECODER
WITH 5V TOLERANT INPUTS
■ HIGH SPEED :
t
= 5.5ns (TYP.) at V
PD
■ 5V TOLERANT INPUTS
■ INPUT VOLTAGE LEVEL :
V
=0.8V , VIH=2V at VCC=3V
IL
■ LOW POWER DISSIPATION:
I
= 2 µA (MAX.) at TA=25°C
CC
■ LOW NOISE:
V
= 0.3V (TYP.) at VCC = 3.3V
OLP
■ SYMMETRICAL OUTPUT IMPEDANCE:
|I
| = IOL = 4mA (MIN)
OH
■ BALANCED PROPAGATION DELAYS:
t
≅ t
PLH
■ OPERATING VOL TAGE RANGE:
V
CC
■ PIN AND FUNCTION COMPATIBLE WITH
PHL
(OPR) = 2V to 3.6V (1.2V Data Retention)
CC
= 3.3V
74 SERIES 138
■ IMPROVED LATCH-UP IMMUNITY
■ POWER DOWN PROTECTION ON INPUTS
DESCRIPTION
The 74LVX238 is a low voltage CMOS 3 TO 8
LINE DECODER 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 high.
If enable input G1 is held low or either G2A
or G2B
TSSOPSOP
ORDER CODES
PACKAGE TUBE T & R
SOP 74LVX238M 74LVX238MTR
TSSOP 74LVX238TTR
is held high, the decoding function is inhibited and
all the 8 outputs go low.
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.
PIN CONNECTION AND IEC LOGIC SYMBOLS
1/9July 2001
74LVX238
INPUT EQUIVALENT CIRCUIT PIN DESCRIPTION
PIN No SYMBOL NAME AND FUNCTION
1, 2, 3 A, B, C Address Inputs
4, 5 G2A
6 G1 Enable Input
15, 14, 13,
12, 1 1, 10, 9,
7
8 GND Ground (0V)
16 V
TRUTH TABLE
, G2B Enable Inputs
Y0 to Y7 Outputs
CC
Positive Supply Voltage
INPUTS
ENABLE SELECT
G2B
X : Don’t Care
G2A G1 C B A Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7
XXLXXXLLLLLLLL
XHXXXXLLLLLLLL
HXXXXXLLLLLLLL
LLHLLLHLLLLLLL
LLHLLHLHLLLLLL
LLHLHLLLHLLLLL
LLHLHHLLLHLLLL
LLHHLLLLLLHLLL
LLHHLHLLLLLHLL
LLHHHLLLLLLLHL
LLHHHHLLLLLLLH
OUTPUTS
LOGIC DIAGRAM
This log i c diagram has not be used to esti m at e propagation delays
2/9
74LVX238
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
V
V
I
I
OK
I
I
or I
CC
T
T
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
Symbol Parameter Value Unit
V
V
V
T
dt/dv
1) Truth T abl e guarante ed: 1.2V to 3.6 V
from 0.8V to 2.0V
2) V
IN
Supply Voltage
CC
DC Input Voltage
I
DC Output Voltage -0.5 to VCC + 0.5
O
DC Input Diode Current
IK
DC Output Diode Current
DC Output Current
O
DC VCC or Ground Current
GND
Storage Temperature
stg
Lead Temperature (10 sec)
L
Supply Voltage (note 1)
CC
Input Voltage
I
Output Voltage 0 to V
O
Operating Temperature
op
Input Rise and Fall Time (note 2) (V
= 3.3V)
CC
-0.5 to +7.0 V
-0.5 to +7.0 V
- 20 mA
± 20 mA
± 25 mA
± 50 mA
-65 to +150 °C
300 °C
2 to 3.6 V
0 to 5.5 V
CC
-55 to 125 °C
0 to 100 ns/V
V
V
DC SPECIFICATIONS
Symbol Parameter
V
V
V
V
I
High Level Input
IH
Voltage
Low Level Input
IL
Voltage
High Level Output
OH
Voltage
Low Level Output
OL
Voltage
I
Input Leakage
I
Current
Quiescent Supply
CC
Current
Test Condition Value
V
(V)
CC
T
A
Min. Typ. Max. Min. Max. Min. Max.
-40 to 85°C -55 to 125°C
= 25°C
2.0 1.5 1.5 1.5
3.6 2.4 2.4 2.4
2.0 0.5 0.5 0.5
3.6 0.8 0.8 0.8
=-50 µA
2.0
3.0
2.0
3.0
3.6
3.6
I
O
I
=-50 µA
O
I
=-4 mA
O
=50 µA
I
O
I
=50 µA
O
I
=4 mA
O
= 5V or GND
V
I
= VCC or GND
V
I
1.9 2.0 1.9 1.9
2.9 3.0 2.9 2.9
2.58 2.48 2.4
0.0 0.1 0.1 0.1
0.0 0.1 0.1 0.1
0.36 0.44 0.55
± 0.1 ± 1 ± 1 µA
22020µA
Unit
V3.0 2.0 2.0 2.0
V3.0 0.8 0.8 0.8
V3.0
V3.0
3/9
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