Diodes 74HCT138 - Manual (Page 5)

74HCT138
Document number: DS35489 Rev. 3 - 2
5 of 10
www.diodes.com
June 2013
© Diodes Incorporated
74HCT138
Electrical Characteristics (@T
A
= +25°C, unless otherwise specified.)
Symbol Parameter Test Conditions Vcc
T
A
= 25°C -40°C to 85°C -40°C to 125°C
Unit
Min Typ Max Min Max Min Max
V
IH
High-level
Input Voltage
 4.5V to 5.5V 2.0 1.6  2.0  2.0  V
V
IL
Low-level
input voltage
 4.5V to 5.5V  1.2 0.8  0.8  0.8 V
V
OH
High Level
Output
Voltage I
OH
= -20 μA 4.5V 4.4 4.5  4.4  4.4 
V
I
OH
= -4 mA 4.5V 3.98
4.32
 3.85  3.7 
V
OL
Low-level
Output
Voltage I
OL
= 20 μA 4.5V  0 0.1  0.1  0.1
V
I
OL
= 4 mA 4.5V
 0.15
0.26  0.33  0.4
I
I
Input Current
V
I
=GND to
5.5 V
5.5V

 ±0.1  ± 1  ± 1 μA
I
CC
Supply
Current V
I
= GND or V
CC
I
O
=0
5.5V

 8.0  80  160 μA
∆I
CC
Additional
Supply
Current
Test Per
Pin
V
I
=
Vcc -2.1 V
Other
V
I
= Vcc
or GND
I
O
=0
PINS
An
4.5V to 5.5V

150 540  675  735
μA
PIN En  125 450  563  613
PIN E3  100 360  450  490 μA
C
i
Input
Capacitance
V
i
= V
CC
or GND 5.5V  4 10  10  10 pF
Switching Characteristics
Symbol /
Parameter
Pins
Test
Conditions
Vcc
T
A
=25°C -40°C to 85°C -40°C to 125°C
Unit
Min Typ. Max Min Max Min Max
t
PLH,
t
PLH
Propagation
Delay
An to Yn Figure 2
4.5V  20 35  35  45
ns
5.0V  17     
E3 to Yn Figure 2
4.5V  18 40  40  45
5.0V  19     
En to Yn Figure 2
4.5V  19 40  40  45
5.0V  19     
t
TLH,
t
THL
Transition
Time
Yn Figure 2 4.5 V  7 15  15  110 ns