Document
UNISONIC TECHNOLOGIES CO., LTD U74HC138
3-TO-8 LINE DECODERS / DEMULTIPLEXERS
DESCRIPTION
The U74HC138 decodes a three-bit Address to 1-of-8 active-low outputs.
This device features three Chip Select inputs, two active-low and one active-high, to facilitate the demultiplexing, cascading, and chip-selecting functions.
The demultiplexing function is accomplished by using the address inputs to select the desired device output. One of the Chip Selects is used as a data input while the other Chip Selects are held in their active states.
FEATURES
* Operate from 2.0V ~ 6.0V * Low Input Current: 100nA Max * Low Quiescent Current: 8μA Max * Typ tPD=15ns * Output Drive:4mA @ 5V
ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
U74HC138L-D16-T
U74HC138G-D16-T
U74HC138L-S16-R
U74HC138G-S16-R
U74HC138L-R16-R
U74HC138G-R16-R
U74HC138L-P16-R
U74HC138G-P16-R
Package
DIP-16 SOP-16 SSOP-16 TSSOP-16
CMOS IC
DIP-16
SOP-16
SSOP-16
TSSOP-16
Packing Tube
Tape Reel Tape Reel Tape Reel
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QW-R502-614.F
U74HC138
MARKING
Package
DIP-16
SOP-16 TSSOP-16
CMOS IC
Marking
16 15 14 13 12 11 10
UTC U74HC138
9
1 2345 6 7 8
Date Code
L: Lead Free G: Halogen Free Lot Code
SSOP-16
PIN CONFIGURATION
A0 1 A1 2 A2 3 E1 4 E2 5 E3 6
Y7 GND
7 8
16 VCC 15 Y0 14 Y1 13 Y2 12 Y3 11 Y4 10 Y5 9 Y6
FUNCTION TABLE
INPUTS
OUTPUTS
E1 E2 E3 A0 A1 A2 Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7
HXXXXXHHHHHHHH
XHXXXXHHHHHHHH
XX L XXXHHHHHHHH
L LHL L L LHHHHHHH
L LHHL LHLHHHHHH
L LHLHLHHLHHHHH
L LHHHLHHHLHHHH
L LHL LHHHHHLHHH
L LHHLHHHHHHLHH
L LHLHHHHHHHHLH
L LHHHHHHHHHHHL
Note: H: High voltage level
L: Low voltage level
X: Don’t care
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U74HC138
LOGIC SYMBOL
LOGIC DIAGRAM
E1 E2 E3
A0 A1 A2
CMOS IC
Y3
Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7
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QW-R502-614.F
U74HC138
CMOS IC
ABSOLUTE MAXIMUM RATING
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Voltage Input Clamp Current(VI<0 or VI>VCC)
VCC IIK
-0.5 ~ 7.0 ±20
V mA
Output Clamp Current(VO<0 or VO>VCC) Continuous Output Current(VO=0 ~ VCC)
IOK IO
±20 mA ±25 mA
VCC or GND Current Storage Temperature
ICC TSTG
±50 -65 ~ + 150
mA °C
Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
RECOMMENDED OPERATING CONDITIONS
PARAMETER Supply Voltage Input Voltage Output Voltage Operating Temperature
Input Rise or Fall Times
SYMBOL VCC VIN VOUT TA
tR, tF
TEST CONDITIONS Operating
VCC=2.0V VCC=4.5V VCC=6.0V
MIN TYP MAX UNIT
2.0 5.0 6.0 V
0
VCC
V
0
VCC
V
-40 +85 °C
1000
500 ns
400
THERMAL CHARACTERISTICS
PARAMETER Junction to Ambient
DIP-16 SOP-16 SSOP-16 TSSOP-16
SYMBOL θJA
RATINGS 67 73 90 108
UNIT °C/W
ELECTRICAL CHARACTERISTICS (TA=25°C)
PARAMETER High-level input voltage Low-level output voltage
High-Level Output Voltage
Low-Level Output Voltage Input Leakage Current Quiescent Supply Current Input Capacitance
SYMBOL VIH VIL
VOH
VOL II(LEAK)
ICC CI
TEST CONDITIONS VCC=2V VCC=4.5V VCC=6V VCC=2V VCC=4.5V VCC=6V VCC=2V, IOH=-20μA VCC=4.5V, IOH=-20μA VCC=6V, IOH=-20μA VCC=4.5V, IOH=-4.0mA VCC=6V, IOH=-5.2mA VCC=2V, IOL=20μA VCC=4.5V, IOL=20μA VCC=6V, IOL=20μA VCC=4.5V, IOL=4mA VCC=6V, IOL=5.2mA VCC=6V, VIN= VCC or GND VCC=6V, VIN=VCC or GND, IOUT=0 VCC=2~6V
MIN TYP MAX UNIT
1.5 V
3.15 V
4.2 V
0.5 V
1.35 V
1.8 V
1.9 1.998
V
4.4 4.499
V
5.9 5.999
V
3.98 4.3
V
5.48 5.8
V
0.002 0.1 V
0.001 0.1 V
0.001 0.1 V
0.17 0.26 V
0.15 0.26 V
±0.1 ±100 nA
8 μA
3 10 pF
UNISONIC TECHNOLOGIES CO., LTD
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QW-R502-614.F
U74HC138
CMOS IC
SWITCHING CHARACTERISTICS (TA=25°C, CL=50pF, see Test Circuit and Waveforms)
PARAMETER Propagation delay from input (An) to output( Yn )
Propagation delay from input (E3) to output( Yn )
Propagation delay from input ( En ) to output( Yn )
Output Transition Time
SYMBOL tPLH/tPHL tPLH/tPHL tPLH/tPHL tTLH/tTHL
TEST CONDITIONS VCC =2.0V VCC =4.5V VCC =6.0V VCC =2.0V VCC =4.5V VCC =6.0V VCC =2.0V VCC =4.5V VCC =6.0V VCC =2.0V VCC =4.5V VCC =6.0V
MIN TYP MAX UNIT 67 180 ns 18 36 ns 15 31 ns 66 155 ns 18 31 ns 15 26 ns 66 155 ns 18 31 ns 15 26 ns 38 75 ns 8 15 ns 6 13 ns
OPERATING CHARACTERISTICS
PARAMETER Power Dissipation Capacitance
SYMBOL
TEST CONDITIONS
CPD No Load
MIN TYP MAX UNIT 85 pF
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U74HC138
TEST CIRCUIT AND WAVEFORMS
CMOS IC
Test Circuit
Input Output
50% tPHL
90%
50% 10%
tTHL
50%
tPLH
10%
50% tTLH
VCC
GND 90% VOH
VOL
Output
tTLH
10% tPLH
90% 50%
90%
tTHL 50%
tPHL
VOH
10%
VOL
Propagation Delay and Output Transition Times
Note: CL includes probe and jig capacitance. All input pu.