SN74LS138_01 Datasheet, PDF (4/8 Pages) ON Semiconductor – 1-of-8 Decoder/ Demultiplexer

SN74LS138
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Symbol
Parameter
Min Typ Max Unit
Test Conditions
VIH
Input HIGH Voltage
2.0
V
Guaranteed Input HIGH Voltage for
All Inputs
VIL
Input LOW Voltage
0.8
V
Guaranteed Input LOW Voltage for
All Inputs
VIK
VOH
Input Clamp Diode Voltage
Output HIGH Voltage
–0.65 –1.5
2.7
3.5
V
VCC = MIN, IIN = –18 mA
V
VCC = MIN, IOH = MAX, VIN = VIH
or VIL per Truth Table
VOL
Output LOW Voltage
0.25 0.4
V
0.35 0.5
V
IIH
Input HIGH Current
20
µA
0.1
mA
IIL
Input LOW Current
–0.4 mA
IOS
Short Circuit Current (Note 2)
–20
–100 mA
ICC
Power Supply Current
10
mA
2. Not more than one output should be shorted at a time, nor for more than 1 second.
IOL = 4.0 mA
IOL = 8.0 mA
VCC = VCC MIN,
VIN = VIL or VIH
per Truth Table
VCC = MAX, VIN = 2.7 V
VCC = MAX, VIN = 7.0 V
VCC = MAX, VIN = 0.4 V
VCC = MAX
VCC = MAX
AC CHARACTERISTICS (TA = 25°C)
Symbol
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
Parameter
Propagation Delay
Address to Output
Propagation Delay
Address to Output
Propagation Delay E1 or E2
Enable to Output
Propagation Delay E3
Enable to Output
Levels of
Limits
Delay
Min Typ Max Unit
2
2
13
27
20
41
ns
3
3
18
26
27
39
ns
2
2
12
21
18
32
ns
3
3
17
25
26
38
ns
Test Conditions
VCC = 5.0 V
CL = 15 pF
AC WAVEFORMS
VIN
VOUT
1.3 V
tPHL
1.3 V
1.3 V
tPLH
1.3 V
VIN
VOUT
1.3 V
tPHL tPLH
1.3 V
1.3 V
1.3 V
Figure 1.
Figure 2.
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