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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 500Ω/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
TA = -10° to 70° C
for all packages
FUNCTION TABLE
Inputs Outputs
Enable A,
Enable B
A,B YA,YB
LLL
LHH
HXZ
X=don’t care
Z = high impedance
LOGIC DIAGRAM
PIN 20=V
CC
PIN 10 = GND
PIN ASSIGNMENT
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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 VCC = min, IIN = -18 mA -1.5 V
V
OH
High Level Output Voltage VCC = min, IOH = -0.4 mA 2.5 V
VCC = min, IOH = -3.0 mA 2.4
VCC = min, IOH = -15 mA 2.0
V
OL
Low Level Output Voltage VCC = min, IOL = 12 mA 0.4 V
VCC = min, IOL = 24 mA 0.5
I
OZH
Output Off Current HIGH VCC = max, V
OUT
= 2.7 V 20
µ
A
I
OZL
Output Off Current LOW VCC = max, V
OUT
= 0.4 V -20
µ
A
I
IH
High Level Input Current VCC = max, VIN = 2.7 V 20
µ
A
VCC = max, VIN = 7.0 V 0.1 mA
I
IL
Low Level Input Current VCC = max, VIN = 0.4 V -0.1 mA
I
O
Output Short Circuit Current VCC = max, VO = 2.25 V -30 -112 mA
I
CC
Supply Current VCC = max Outputs High 15 mA
Outputs Low 24
3-State
(High Z)
27
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IN74ALS244
3
AC ELECTRICAL CHARACTERISTICS
over full operating conditions
(VCC = 5.0 V±10%,
C
L
= 50 pF, RL1 =RL2 = 500 Ω, Input tr = tf = 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
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IN74ALS244
4
EXPANDED LOGIC DIAGRAM
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