Datasheet

UNISONIC TECHNOLOGIES CO., LTD
U74HC138
CMOS IC
3-TO-8 LINE DECODERS /
DEMULTIPLEXERS

DIP-16
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.

SOP-16
SSOP-16
FEATURES
* Operate from 2.0V ~ 6.0V
* Low Input Current: 100nA Max
* Low Quiescent Current: 8μA Max
* Typ tPD=15ns
* Output Drive:4mA @ 5V

TSSOP-16
ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
U74HC138L-D16-T
U74HC138G-D16-T
U74HC138G-S16-R
U74HC138G-R16-R
U74HC138G-P16-R
www.unisonic.com.tw
Copyright © 2015 Unisonic Technologies Co., Ltd
Package
Packing
DIP-16
SOP-16
SSOP-16
TSSOP-16
Tube
Tape Reel
Tape Reel
Tape Reel
1 of 6
QW-R502-614.F
U74HC138

CMOS IC
MARKING
Package
Marking
16 15 14
13
12
11
10
9
Date Code
UTC
U74HC138
DIP-16
1
2
3
4
5
6
7
L: Lead Free
G: Halogen Free
Lot Code
8
SOP-16
TSSOP-16
SSOP-16


PIN CONFIGURATION
A0
1
16 VCC
A1
2
15 Y0
A2
3
14 Y1
E1
4
13 Y2
E2
5
12 Y3
E3
6
11 Y4
Y7
7
10 Y5
GND
8
9
FUNCTION TABLE
INPUTS
E1
Y6
E2
E3
H
X
X
X
H
X
X
X
L
L
L
H
L
L
H
L
L
H
L
L
H
L
L
H
L
L
H
L
L
H
L
L
H
Note: H: High voltage level
A0
X
X
X
L
H
L
H
L
H
L
H
OUTPUTS
A1
A2
X
X
X
X
X
X
L
L
L
L
H
L
H
L
L
H
L
H
H
H
H
H
L: Low voltage level
Y0
H
H
H
L
H
H
H
H
H
H
H
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
Y1
Y2
H
H
H
H
H
H
H
H
L
H
H
L
H
H
H
H
H
H
H
H
H
H
X: Don’t care
Y3
Y4
Y5
Y6
Y7
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
L
2 of 6
QW-R502-614.F
U74HC138

CMOS IC
LOGIC SYMBOL
Y3

LOGIC DIAGRAM
E1
E2
E3
Y0
Y1
Y2
Y3
Y4
A0
A1
A2
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
Y5
Y6
Y7
3 of 6
QW-R502-614.F
U74HC138

CMOS IC
ABSOLUTE MAXIMUM RATING
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Voltage
VCC
-0.5 ~ 7.0
V
Input Clamp Current(VI<0 or VI>VCC)
IIK
±20
mA
Output Clamp Current(VO<0 or VO>VCC)
IOK
±20
mA
Continuous Output Current(VO=0 ~ VCC)
IO
±25
mA
VCC or GND Current
ICC
±50
mA
Storage Temperature
TSTG
-65 ~ + 150
°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
SYMBOL
VCC
VIN
VOUT
TA
Input Rise or Fall Times
tR, tF

MIN
2.0
0
0
-40
TYP
5.0
VCC=2.0V
VCC=4.5V
VCC=6.0V
MAX UNIT
6.0
V
VCC
V
VCC
V
+85
°C
1000
ns
500
400
THERMAL CHARACTERISTICS
PARAMETER
Junction to Ambient

TEST CONDITIONS
Operating
SYMBOL
DIP-16
SOP-16
SSOP-16
TSSOP-16
θJA
RATINGS
67
73
90
108
UNIT
°C/W
ELECTRICAL CHARACTERISTICS (TA=25°C)
PARAMETER
SYMBOL
High-level input voltage
VIH
Low-level output voltage
VIL
High-Level Output Voltage
VOH
Low-Level Output Voltage
VOL
Input Leakage Current
Quiescent Supply Current
Input Capacitance
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, IOH=4mA
VCC=6V, IOL=5.2mA
VCC=6V, VIN= VCC or GND
VCC=6V, VIN=VCC or GND, IOUT=0
VCC=2~6V
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
MIN
1.5
3.15
4.2
TYP
1.9 1.998
4.4 4.499
5.9 5.999
3.98 4.3
5.48 5.8
0.002
0.001
0.001
0.17
0.15
±0.1
3
MAX UNIT
V
V
V
0.5
V
1.35
V
1.8
V
V
V
V
V
V
0.1
V
0.1
V
0.1
V
0.26
V
0.26
V
±100
nA
8
μA
10
pF
4 of 6
QW-R502-614.F
U74HC138

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

CMOS IC
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
67
18
15
66
18
15
66
18
15
38
8
6
MAX UNIT
180
ns
36
ns
31
ns
155
ns
31
ns
26
ns
155
ns
31
ns
26
ns
75
ns
15
ns
13
ns
MIN
TYP
85
MAX UNIT
pF
OPERATING CHARACTERISTICS
PARAMETER
Power Dissipation Capacitance
SYMBOL
TEST CONDITIONS
CPD
No Load
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
5 of 6
QW-R502-614.F
U74HC138

CMOS IC
TEST CIRCUIT AND WAVEFORMS
Test Circuit
VCC
50%
Input
50%
tPHL
Output
90%
90%
50%
10%
VOH
50%
10%
VOL
tTLH
tTHL
tTLH
Output
GND
tPLH
tTHL
90%
50%
10%
tPLH
VOH
90%
50%
10%
VOL
tPHL
Propagation Delay and Output Transition Times
Note: CL includes probe and jig capacitance.
All input pulses are supplied by generators having the following characteristics: ZO = 50Ω, tR =6ns, tF =6ns.
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
6 of 6
QW-R502-614.F
Similar pages