74AC138 Fairchild Semiconductor, 74AC138 Datasheet - Page 5

• Manufacturer Part Number: 74AC138
• Description: 1-of-8 Decoder/Demultiplexer
• Manufacturer: Fairchild Semiconductor

AC ELECTRICAL CHARACTERISTICS (C
(*) Voltage range is 3.3V 0.3V
(**) Voltage range is 5V 0.5V
CAPACITIVE CHARACTERISTICS
1) C
Test Circuit). Average operating current can be obtained by the following equation. I
TEST CIRCUIT
C
R
R
Symbol
Symbol
L
L
T
= 50 pF or equivalent (includes jig and probe capacitance)
= R
=Z
t
t
t
t
t
t
C
PD
C
PLH
PHL
PLH
PHL
PLH
PHL
PD
IN
1
OUT
is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without load. (Refer to
= 500 or equivalent
of pulse generator (typically 50 )
Propagation Delay Time
A,B,C to Y
Propagation Delay Time
G1to Y
Propagation Delay Time
G2A or G2B to Y
Input Capacitance
Power Dissipation
Capacitance (note 1)
Parameter
Parameter
5.0
5.0
5.0
3.3
3.3
3.3
V
V
5.0
(V)
(V)
5.0
CC
CC
(**)
(**)
(**)
(*)
(*)
(*)
Test Con dition s
T est Cond ition
L
= 50 pF, R
L
CC
= 500 , Input t
(opr) = C
Min.
Min.
PD
1.5
1.5
1.5
1.5
1.5
1.5
V
T
T
CC
A
A
Typ.
Typ.
f
= 25
= 25
IN
5.5
4.5
4.5
5.5
4.5
60
6
4
+ I
r
= t
CC
/n (per circuit)
o
o
f
C
C
Value
Value
Max.
Max.
=3 ns)
13
13
11
13
9
9
-40 to 85
-40 to 85
Min .
Min .
1.5
1.5
1.5
1.5
1.5
1.5
Max.
Max.
14
10
14
12
14
10
o
o
74AC138
C
C
Unit
Unit
pF
ns
ns
ns
pF
5/9