TECHNICAL DATA
IN74ACT244
Octal 3-State Noninverting
Buffer/Line Driver/Line Receiver
High-Speed Silicon-Gate CMOS
The IN74ACT244 is identical in pinout to the LS/ALS244,
HC/HCT244. The IN74ACT244 may be used as a level converter for
interfacing TTL or NMOS outputs to High Speed CMOS inputs.
This octal noninverting buffer/line driver/line receiver is designed
to be used with 3-state memory address drivers, clock drivers, and
other bus-oriented systems. The device has noninverting outputs and
two active-low output enables.
•
TTL/NMOS Compatible Input Levels
•
Outputs Directly Interface to CMOS, NMOS, and TTL
•
Operating Voltage Range: 4.5 to 5.5 V
•
Low Input Current: 1.0
µA;
0.1
µA
@ 25°C
•
Outputs Source/Sink 24 mA
ORDERING INFORMATION
IN74ACT244N Plastic
IN74ACT244DW SOIC
T
A
= -40° to 85° C for all
packages
PIN ASSIGNMENT
LOGIC DIAGRAM
FUNCTION TABLE
Inputs
Enable A,
Enable B
L
PIN 20=V
CC
PIN 10 = GND
L
H
X=don’t care
Z = high impedance
A,B
L
H
X
Outputs
YA,YB
L
H
Z
322
IN74ACT244
MAXIMUM RATINGS
*
Symbol
V
CC
V
IN
V
OUT
I
IN
I
OUT
I
CC
P
D
Tstg
T
L
*
Parameter
DC Supply Voltage (Referenced to GND)
DC Input Voltage (Referenced to GND)
DC Output Voltage (Referenced to GND)
DC Input Current, per Pin
DC Output Sink/Source Current, per Pin
DC Supply Current, V
CC
and GND Pins
Power Dissipation in Still Air, Plastic DIP+
SOIC Package+
Storage Temperature
Lead Temperature, 1 mm from Case for 10 Seconds
(Plastic DIP or SOIC Package)
Value
-0.5 to +7.0
-0.5 to V
CC
+0.5
-0.5 to V
CC
+0.5
±20
±50
±50
750
500
-65 to +150
260
Unit
V
V
V
mA
mA
mA
mW
°C
°C
Maximum Ratings are those values beyond which damage to the device may occur.
Functional operation should be restricted to the Recommended Operating Conditions.
+Derating - Plastic DIP: - 10 mW/°C from 65° to 125°C
SOIC Package: : - 7 mW/°C from 65° to 125°C
RECOMMENDED OPERATING CONDITIONS
Symbol
V
CC
V
IN
, V
OUT
T
J
T
A
I
OH
I
OL
t
r
, t
f
*
Parameter
DC Supply Voltage (Referenced to GND)
DC Input Voltage, Output Voltage (Referenced to GND)
Junction Temperature (PDIP)
Operating Temperature, All Package Types
Output Current - High
Output Current - Low
Input Rise and Fall Time
*
(except Schmitt Inputs)
V
CC
=4.5 V
V
CC
=5.5 V
Min
4.5
0
-40
Max
5.5
V
CC
140
+85
-24
24
Unit
V
V
°C
°C
mA
mA
ns/V
0
0
10
8.0
V
IN
from 0.8 V to 2.0 V
This device contains protection circuitry to guard against damage due to high static voltages or electric
fields. However, precautions must be taken to avoid applications of any voltage higher than maximum rated
voltages to this high-impedance circuit. For proper operation, V
IN
and V
OUT
should be constrained to the range
GND≤(V
IN
or V
OUT
)≤V
CC
.
Unused inputs must always be tied to an appropriate logic voltage level (e.g., either GND or V
CC
).
Unused outputs must be left open.
323
IN74ACT244
DC ELECTRICAL CHARACTERISTICS
(Voltages Referenced to GND)
V
CC
Symbol
V
IH
V
IL
V
OH
Parameter
Minimum High-Level
Input Voltage
Maximum Low -
Level Input Voltage
Minimum High-Level
Output Voltage
Test Conditions
V
OUT
= V
CC
-0.1 V
V
OUT
=0.1 V
I
OUT
≤
-50
µA
*
Guaranteed Limits
25
°C
2.0
2.0
0.8
0.8
4.4
5.4
3.86
4.86
0.1
0.1
0.36
0.36
±0.1
±0.5
-40°C to
85°C
2.0
2.0
0.8
0.8
4.4
5.4
3.76
4.76
0.1
0.1
0.44
0.44
±1.0
±5.0
µA
µA
V
Unit
V
V
V
V
4.5
5.5
4.5
5.5
4.5
5.5
4.5
5.5
4.5
5.5
4.5
5.5
5.5
5.5
V
IN
=V
IH
I
OH
=-24 mA
I
OH
=-24 mA
V
OL
Maximum Low-Level
Output Voltage
I
OUT
≤
50
µA
V
IN
=V
IL
I
OL
=24 mA
I
OL
=24 mA
I
IN
I
OZ
Maximum Input
Leakage Current
Maximum Three-
State Leakage
Current
Additional Max
I
CC
/Input
+Minimum Dynamic
Output Current
+Minimum Dynamic
Output Current
Maximum Quiescent
Supply Current
(per Package)
V
IN
=V
CC
or GND
V
IN
(OE)=V
IL
or V
IH
V
IN
=V
CC
or GND
V
OUT
=V
CC
or GND
V
IN
=V
CC
- 2.1 V
V
OLD
=1.65 V Max
V
OHD
=3.85 V Min
V
IN
=V
CC
or GND
*
∆I
CCT
I
OLD
I
OHD
I
CC
5.5
5.5
5.5
5.5
8.0
1.5
75
-75
80
mA
mA
mA
µA
All outputs loaded; thresholds on input associated with output under test.
+Maximum test duration 2.0 ms, one output loaded at a time.
*
324
IN74ACT244
AC ELECTRICAL CHARACTERISTICS
(V
CC
=5.0 V
±
10%, C
L
=50pF,Input t
r
=t
f
=3.0 ns)
Guaranteed Limits
Symbol
Parameter
25
°C
Min
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
C
IN
Propagation Delay, A to YA or B to YB
(Figure 1)
Propagation Delay, A to YA or B to YB
(Figure 1)
Propagation Delay, Output Enable to YA or YB
(Figure 2)
Propagation Delay, Output Enable to YA or YB
(Figure 2)
Propagation Delay, Output Enable to YA or YB
(Figure 2)
Propagation Delay, Output Enable to YA or YB
(Figure 2)
Maximum Input Capacitance
2.0
2.0
1.5
2.0
2.0
2.5
4.5
Max
9.0
9.0
8.5
9.5
9.5
10.0
-40°C to
85°C
Min
1.5
1.5
1.0
1.5
1.5
2.0
4.5
Max
10.0
10.0
9.5
10.5
10.5
10.5
ns
ns
ns
ns
ns
ns
pF
Unit
Typical @25°C,V
CC
=5.0 V
C
PD
Power Dissipation Capacitance
45
pF
Figure 1. Switching Waveforms
Figure 2. Switching Waveforms
325
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