HD74AC241/HD74ACT241
Octal Buffer/Line Driver with 3-State Output
Description
The HD74AC241/HD74ACT241 is an octal buffer and line driver designed to be employed as a memory
address driver, clock driver and bus-oriented transmitter or receiver which provides improved PC board
density.
Features
•
3-State Outputs Drive Bus Lines or Buffer Memory Address Registers
•
Outputs Source/Sink 24 mA
•
HD74ACT241 has TTL-Compatible Inputs
Pin Arrangement
OE1
1
2
3
4
5
6
7
8
9
GND 10
(Top view)
20 V
CC
19
OE2
18
17
16
15
14
13
12
11
HD74AC241/HD74ACT241
Truth Tables
Inputs
OE
1
L
L
H
D
L
H
X
Outputs (Pins 12, 14, 16, 18)
L
H
Z
Inputs
OE
2
H
H
L
H
L
X
Z
:
:
:
:
High Voltage Level
Low Voltage Level
Immaterial
High Impedance
D
L
H
X
Outputs (Pins 3, 5, 7, 9)
L
H
Z
DC Characteristics
(unless otherwise specified)
Item
Maximum quiescent supply current
Maximum quiescent supply current
Maximum additional I
CC
/input
(HD74ACT241)
Symbol
I
CC
I
CC
I
CCT
Max
80
8.0
1.5
Unit
µA
µA
mA
Condition
V
IN
= V
CC
or ground, V
CC
= 5.5 V,
Ta = Worst case
V
IN
= V
CC
or ground, V
CC
= 5.5 V,
Ta = 25°C
V
IN
= V
CC
– 2.1 V, V
CC
= 5.5 V,
Ta = Worst case
2
HD74AC241/HD74ACT241
AC Characteristics: HD74AC241
Ta = +25°C
C
L
= 50 pF
Item
Propagation delay
Data to output
Propagation delay
Data to output
Output enable time
t
PZH
t
PHL
Symbol
t
PLH
V
CC
(V)*
1
3.3
5.0
3.3
5.0
3.3
5.0
Output enable time
t
PZL
3.3
5.0
Output disable time
t
PHZ
3.3
5.0
Output disable time
t
PLZ
3.3
5.0
Note:
1. Voltage Range 3.3 is 3.3 V
±
0.3 V
Voltage Range 5.0 is 5.0 V
±
0.5 V
Min
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
Typ
6.0
5.0
6.0
4.5
6.5
5.5
7.0
5.5
8.0
6.5
7.0
6.0
Max
9.0
7.0
9.0
7.0
12.5
9.0
12.0
9.0
12.0
10.0
12.5
10.0
Ta = –40°C to +85°C
C
L
= 50 pF
Min
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
Max
10.0
7.5
10.5
7.5
13.0
9.5
13.0
9.5
12.5
10.5
13.5
10.5
ns
ns
ns
ns
ns
Unit
ns
AC Characteristics: HD74ACT241
Ta = +25°C
C
L
= 50 pF
Item
Propagation delay
Data to output
Propagation delay
Data to output
Output enable time
Output enable time
Output disable time
Output disable time
Note:
Symbol
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
V
CC
(V)*
1
5.0
5.0
5.0
5.0
5.0
5.0
Min
1.0
1.0
1.0
1.0
1.0
1.0
Typ
6.5
7.0
6.0
7.0
8.0
7.0
Max
9.0
9.0
9.0
10.0
10.5
10.5
Ta = –40°C to +85°C
C
L
= 50 pF
Min
1.0
1.0
1.0
1.0
1.0
1.0
Max
10.0
10.0
10.0
11.0
11.5
11.5
Unit
ns
ns
ns
ns
ns
ns
1. Voltage Range 5.0 is 5.0 V
±
0.5 V
3
HD74AC241/HD74ACT241
Capacitance
Item
Input capacitance
Power dissipation capacitance
Symbol
C
IN
C
PD
Typ
4.5
45.0
Unit
pF
pF
Condition
V
CC
= 5.5 V
V
CC
= 5.0 V
4
Unit: mm
24.50
25.40 Max
20
11
7.00 Max
6.30
1
0.89
1.27 Max
10
1.30
2.54 Min 5.08 Max
7.62
0.51 Min
2.54
±
0.25
0.48
±
0.10
0.25
– 0.05
0° – 15°
+ 0.11
Hitachi Code
JEDEC
EIAJ
Weight (reference value)
DP-20N
—
Conforms
1.26 g
微控制器 MCU
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