HD74LS138 Datasheet, PDF (3/8 Pages) Hitachi Semiconductor – 3-Line-to-8-Line Decoders/Demultiplexers

HD74LS138
Electrical Characteristics
Item
Input voltage
Symbol
V_IH
V_IL
V_OH
Output voltage
V_OL
I_IH
Input current
I_IL
I_I
Short-circuit output
current
I_OS
Supply current
I_CC
Input clamp voltage
V_IK
Note: * V_CC = 5 V, Ta = 25°C
min.
2.0
—
2.7
—
—
—
—
—
–20
—
—
typ.*
—
—
—
—
—
—
—
—
—
6.3
—
max.
—
0.8
—
0.4
0.5
20
–0.4
0.1
–100
10
–1.5
Unit
V
V
V
V
µA
mA
mA
mA
mA
V
(Ta = –20 to +75 °C)
Condition
V_CC = 4.75 V, V_IH = 2 V, V_IL = 0.8 V,
I_OH = –400 µA
I_OL = 4 mA V_CC = 4.75 V, V_IH = 2 V,
I_OL = 8 mA VIL = 0.8 V
V_CC = 5.25 V, V_I = 2.7 V
V_CC = 5.25 V, V_I = 0.4 V
V_CC = 5.25 V, V_I = 7 V
V_CC = 5.25 V
V_CC = 5.25 V, Outputs enabled and open
V_CC = 4.75 V, I_IN = –18 mA
Switching Characteristics
(V_CC = 5 V, Ta = 25°C)
Levels
Item
Symbol Inputs Output _{of delay} min.
typ.
max.
Unit Condition
t_PLH
t_PHL
Binary
select
Y
2
—
—
13
20
27
41
ns
ns
t_PLH
A, B, C
—
18
27
ns
3
Propagation
t_PLH
—
26
39
ns
C_L = 15 pF,
delay time
t_PLH
Enable
—
12
18
ns
R_L = 2 kΩ
2
t_PHL
G_2A, G_2B
Y
—
21
32
ns
t_PLH
Enable
—
17
26
ns
3
t_PLH
G₁
—
25
38
ns
Rev.3.00, Jul.13.2005, page 3 of 7