TECHNICAL DATA
1
Octal 3-State Noninverting Buffer/Line
Driver/Line Receiver
The IN74ALS244 is Octal Buffers and Line Drivers designed to be
used as memory address drivers, clock drivers and busoriented
transmitters/receivers which provide improved PC board density.
Switching response specified into 500
/50 pF
Switching specifications guaranteed over full temperature and V
CC
range
Low level drive current:
54ALS = 12 mA, 74ALS = 24 mA
IN74ALS244
ORDERING INFORMATION
IN74ALS244N Plastic
IN74ALS244DW SOIC
T
A
= -10
to 70
C
for all packages
FUNCTION TABLE
Inputs
Outputs
Enable A,
Enable B
A,B
YA,YB
L
L
L
L
H
H
H
X
Z
X=don't care
Z = high impedance
LOGIC DIAGRAM
PIN 20=V
CC
PIN 10 = GND
PIN ASSIGNMENT
IN74ALS244
2
MAXIMUM RATINGS
*
Symbol
Parameter
Value
Unit
V
CC
Supply Voltage
7.0
V
V
IN
Input Voltage
7.0
V
V
OUT
Output Voltage
5.5
V
Tstg
Storage Temperature Range
-65 to +150
C
*
Maximum Ratings are those values beyond which damage to the device may occur.
Functional operation should be restricted to the Recommended Operating Conditions.
RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
Min
Max
Unit
V
CC
Supply Voltage
4.5
5.5
V
V
IH
High Level Input Voltage
2.0
V
V
IL
Low Level Input Voltage
0.8
V
I
OH
High Level Output Current
-15
mA
I
OL
Low Level Output Current
24
mA
T
A
Ambient Temperature Range
-10
+70
C
DC ELECTRICAL CHARACTERISTICS over full operating conditions
Guaranteed Limit
Symbol
Parameter
Test Conditions
Min
Max
Unit
V
IK
Input Clamp Voltage
V
CC
= min, I
IN
= -18 mA
-1.5
V
V
OH
High Level Output Voltage
V
CC
= min, I
OH
= -0.4 mA
2.5
V
V
CC
= min, I
OH
= -3.0 mA
2.4
V
CC
= min, I
OH
= -15 mA
2.0
V
OL
Low Level Output Voltage
V
CC
= min, I
OL
= 12 mA
0.4
V
V
CC
= min, I
OL
= 24 mA
0.5
I
OZH
Output Off Current HIGH
V
CC
= max, V
OUT
= 2.7 V
20
A
I
OZL
Output Off Current LOW
V
CC
= max, V
OUT
= 0.4 V
-20
A
I
IH
High Level Input Current
V
CC
= max, V
IN
= 2.7 V
20
A
V
CC
= max, V
IN
= 7.0 V
0.1
mA
I
IL
Low Level Input Current
V
CC
= max, V
IN
= 0.4 V
-0.1
mA
I
O
Output Short Circuit Current
V
CC
= max, V
O
= 2.25 V
-30
-112
mA
I
CC
Supply Current
V
CC
= max
Outputs High
15
mA
Outputs Low
24
3-State
(High Z)
27
IN74ALS244
3
AC ELECTRICAL CHARACTERISTICS over full operating conditions
(V
CC
= 5.0 V
10%,
C
L
= 50 pF, R
L1
=R
L2
= 500
, Input t
r
= t
f
= 2.0 ns)
Symbol
Parameter
Min
Max
Unit
t
PLH
Propagation Delay, Data to Output
10
ns
t
PHL
Propagation Delay, Data to Output
10
ns
t
PZH
Output Enable Time
20
ns
t
PZL
Output Enable Time
20
ns
t
PHZ
Output Disable Time
40
ns
t
PLZ
Output Disable Time
25
ns
t
PZL
, t
PLZ
- S1 closed
t
PZH
, t
PHZ
- S1 opened
Figure 1. Switching Waveforms
Figure 2. Switching Waveforms
* Includes all probe and jig capacitance.
* Includes all probe and jig capacitance.
Figure 3. Test Circuit
Figure 4. Test Circuit
IN74ALS244
4
EXPANDED
LOGIC DIAGRAM
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