Datasheet 74LVX238TTR, 74LVX238MTR, 74LVX238M Datasheet (SGS Thomson Microelectronics)

Page 1
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
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
Page 2
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
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Page 3
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
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Page 4
74LVX238
DYNAMIC SWITCHING CHARACTERISTICS
Test Condition Value
T
Symbol Parameter
V V
V
Dynamic Low
OLP
Voltage Quiet
OLV
Output (note 1, 2) Dynamic High
IHD
Voltage Input (note
V
CC
(V)
3.3
3.3 2 = 50 pF
C
L
= 25°C
A
Min. Typ. Max. Min. Max. Min. Max.
0.3 0.5
-0.5 -0.3
1, 3)
V
Dynamic Low
ILD
Voltage Input (note
3.3 0.8
1, 3)
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 (V
), f=1MHz.
IHD
AC ELECTRICAL CHARACTERISTICS (Input tr = tf = 3ns)
Test Condition Value
T
Symbol Parameter
t
PLH tPHL
Propagation Delay Time A, B, C to Y
3.3
3.3
t
PLH tPHL
Propagation Delay Time G1 to Y
3.3
3.3
t
PLH tPHL
Propagation Delay Time
or G2B to Y
G2A
3.3
3.3
t
OSLH
t
OSHL
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 ±
Output To Output Skew Time (note1,
2)
0.3V
3.3
C
V
CC
(V)
L
(pF)
2.7 15 7.1 13.8 1.0 16.5 1.0 18.5
2.7 50 9.6 17.3 1.0 20.0 1.0 22.0
(*)
15 5.5 8.8 1.0 10.5 1.0 11.5
(*)
50 8.0 12.3 1.0 14.0 1.0 15.0
2.7 15 8.7 16.3 1.0 19.5 1.0 205
2.7 50 11.2 19.8 1.0 23.0 1.0 25.0
(*)
15 6.8 10.6 1.0 12.5 1.0 13.5
(*)
50 9.3 14.1 1.0 16.0 1.0 17.0
2.7 15 8.8 16.0 1.0 18.5 1.0 19.5
2.7 50 11.3 19.5 1.0 22.0 1.0 23.0
(*)
15 6.9 10.4 1.0 11.5 1.0 13.5
(*)
50 9.4 13.9 1.0 15.0 1.0 17.0
2.7 50 0.5 1.0 1.5 1.5
(*)
50
= 25°C
A
Min. Typ. Max. Min. Max. Min. Max.
0.5 1.0 1.5 1.5
-40 to 85°C -55 to 125°C
), 0V to threshold
ILD
-40 to 85°C -55 to 125°C
Unit
V
Unit
ns
ns
ns
ns
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Page 5
74LVX238
CAPACITIVE CHARACTERISTICS
Test Condition Value
T
Symbol Parameter
C
C
Input Capacitance
IN
Power Dissipation
PD
Capacitance
V
CC
(V)
3.3 4101010pF
= 10MHz
3.3
f
IN
= 25°C
A
Min. Typ. Max. Min. Max. Min. Max.
34 pF
(note 1)
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
TEST CIRCUIT
-40 to 85°C -55 to 125°C
= CPD x VCC x f
CC(opr)
+ I
IN
CC
Unit
CL =15/50pF or equivalent (i ncludes jig and probe cap acitance) R
= Z
of pulse generator (typically 50)
T
OUT
5/9
Page 6
74LVX238
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)
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Page 7
SO-16 MECHANICAL DATA
74LVX238
DIM.
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.)
MIN. TYP MAX. MIN. TYP. M AX.
mm. inch
PO13H
7/9
Page 8
74LVX238
TSSOP16 MECHANICAL DATA
mm. inch
DIM.
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
A2
A
A1
b
e
c
K
L
E
D
E1
PIN 1 IDENTIFICATION
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0080338D
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74LVX238
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