74AC244 • 74ACT244 Octal Buffer/Line Driver with 3-STATE Outputs
November 1988
Revised November 1999
74AC244 • 74ACT244
Octal Buffer/Line Driver with 3-STATE Outputs
General Description
The AC/ACT244 is an octal buffer and line driver designed
to be employed as a memory address driver, clock driver
and bus-oriented transmitter/receiver which provides
improved PC board density.
Features
s
I
CC
and I
OZ
reduced by 50%
s
3-STATE outputs drive bus lines or buffer memory
address registers
s
Outputs source/sink 24 mA
s
ACT244 has TTL-compatible inputs
Ordering Code:
Order Number
74AC244SC
74AC244SJ
74AC244MTC
74AC244PC
74ACT244SC
74ACT244SJ
74ACT244MSA
74ACT244MTC
74ACT244PC
Package Number
M20B
M20D
MTC20
N20A
M20B
M20D
MSA20
MTC20
N20A
Package Description
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300” Wide Body
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300” Wide Body
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
20-Lead Shrink Small Outline Package (SSOP), EIAJ TYPE II, 5.3mm Wide
20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide
Device also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering code.
Logic Symbol
IEEE/IEC
Pin Descriptions
Pin Names
OE
1
, OE
2
I
0
–I
7
O
0
–O
7
Description
3-STATE Output Enable Inputs
Inputs
Outputs
Truth Tables
Inputs
OE
1
L
I
n
L
H
X
Inputs
OE
2
L
L
H
X
=
Immaterial
Z
=
High Impedance
FACT is a trademark of Fairchild Semiconductor Corporation.
Outputs
(Pins 12, 14, 16, 18)
L
H
Z
Outputs
I
n
L
H
X
(Pins 3, 5, 7, 9)
L
H
Z
Connection Diagram
L
H
© 1999 Fairchild Semiconductor Corporation
DS009943
www.fairchildsemi.com
74AC244 • 74ACT244
Absolute Maximum Ratings
(Note 1)
Supply Voltage (V
CC
)
DC Input Diode Current (I
IK
)
V
I
= −0.5V
V
I
=
V
CC
+
0.5V
DC Input Voltage (V
I
)
DC Output Diode Current (I
OK
)
V
O
= −0.5V
V
O
=
V
CC
+
0.5V
DC Output Voltage (V
O
)
DC Output Source
or Sink Current (I
O
)
DC V
CC
or Ground Current
per Output Pin (I
CC
or I
GND
)
Storage Temperature (T
STG
)
Junction Temperature (T
J
)
PDIP
140°C
±50
mA
−65°C
to
+150°C
±50
mA
−20
mA
+20
mA
−0.5V
to V
CC
+
0.5V
−20
mA
+20
mA
−0.5V
to V
CC
+
0.5V
−0.5V
to
+7.0V
Recommended Operating
Conditions
Supply Voltage (V
CC
)
AC
ACT
Input Voltage (V
I
)
Output Voltage (V
O
)
Operating Temperature (T
A
)
Minimum Input Edge Rate (∆V/∆t)
AC Devices
V
IN
from 30% to 70% of V
CC
V
CC
@ 3.3V, 4.5V, 5.5V
Minimum Input Edge Rate (∆V/∆t)
ACT Devices
V
IN
from 0.8V to 2.0V
V
CC
@ 4.5V, 5.5V
125 mV/ns
Note 1:
Absolute maximum ratings are those values beyond which damage
to the device may occur. The databook specifications should be met, with-
out exception, to ensure that the system design is reliable over its power
supply, temperature, and output/input loading variables. Fairchild does not
recommend operation of FACT circuits outside databook specifications.
2.0V to 6.0V
4.5V to 5.5V
0V to V
CC
0V to V
CC
−40°C
to
+85°C
125 mV/ns
DC Electrical Characteristics for AC
Symbol
V
IH
Parameter
Minimum HIGH Level
Input Voltage
V
IL
Maximum LOW Level
Input Voltage
V
OH
Minimum HIGH Level
Output Voltage
V
CC
(V)
3.0
4.5
5.5
3.0
4.5
5.5
3.0
4.5
5.5
3.0
4.5
5.5
V
OL
Maximum LOW Level
Output Voltage
3.0
4.5
5.5
3.0
4.5
5.5
I
IN
(Note 4)
I
OZ
Maximum Input
Leakage Current
Maximum
3-STATE
Current
I
OLD
I
OHD
I
CC
(Note 4)
Minimum Dynamic
Output Current (Note 3)
Maximum Quiescent
Supply Current
5.5
5.5
5.5
4.0
50
−50
80.0
75
−75
40.0
mA
mA
µA
5.5
±0.25
±5.0
±2.5
µA
5.5
0.002
0.001
0.001
T
A
= +25°C
Typ
1.5
2.25
2.75
1.5
2.25
2.75
2.99
4.49
5.49
2.1
3.15
3.85
0.9
1.35
1.65
2.9
4.4
5.4
2.56
3.86
4.86
0.1
0.1
0.1
0.36
0.36
0.36
±0.1
T
A
= −55°C
to
+125°C
T
A
= −40°C
to
+85°C
Guaranteed Limits
2.1
3.15
3.85
0.9
1.35
1.65
2.9
4.4
5.4
2.4
3.7
4.7
0.1
0.1
0.1
0.50
0.50
0.50
±1.0
2.1
3.15
3.85
0.9
1.35
1.65
2.9
4.4
5.4
2.46
3.76
4.76
0.1
0.1
0.1
0.44
0.44
0.44
±1.0
µA
V
I
OL
=
12 mA
I
OL
=
24 mA
I
OL
=
24 mA (Note 2)
V
I
=
V
CC
, GND
V
I
(OE)
=
V
IL
, V
IH
V
I
=
V
CC
, V
GND
V
O
=
V
CC
, GND
V
OLD
=
1.65V Max
V
OHD
=
3.85V Min
V
IN
=
V
CC
or GND
V
I
OUT
=
50
µA
V
I
OH
=
12 mA
I
OH
=
24 mA
I
OH
=
24 mA (Note 2)
V
I
OUT
= −50 µA
V
V
OUT
=
0.1V
or V
CC
−
0.1V
V
Units
Conditions
V
OUT
=
0.1V
or V
CC
−
0.1V
Note 2:
All outputs loaded; thresholds on input associated with output under test.
Note 3:
Maximum test duration 2.0 ms, one output loaded at a time.
Note 4:
I
IN
and I
CC
@ 3.0V are guaranteed to be less than or equal to the respective limit @ 5.5V V
CC
.
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74AC244 • 74ACT244
AC Electrical Characteristics for AC
V
CC
Symbol
Parameter
(V)
(Note 7)
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Propagation Delay
Data to Output
Propagation Delay
Data to Output
Output Enable Time
Output Enable Time
Output Disable Time
Output Disable Time
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
Note 7:
Voltage Range 3.3 is 3.3V
±
0.3V
Voltage Range 5.0 is 5.0V
±
0.5V
T
A
= +25°C
C
L
=
50 pF
Min
2.0
1.5
2.0
1.5
2.0
1.5
2.5
1.5
3.0
2.5
2.5
2.0
Typ
6.5
5.0
6.5
5.0
6.0
5.0
7.5
5.5
7.0
6.5
7.5
6.5
Max
9.0
7.0
9.0
7.0
10.5
7.0
10.0
8.0
10.0
9.0
10.5
9.0
T
A
= −55°C
to
+125°C
T
A
= −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
12.5
9.5
12.0
9.0
11.5
9.0
13.0
10.5
12.5
10.5
13.0
11.0
C
L
=
50 pF
Min
1.5
1.0
2.0
1.0
1.5
1.5
2.0
1.5
1.5
1.0
2.5
2.0
Max
10.0
7.5
10.0
7.5
11.0
8.0
11.0
8.5
10.5
9.5
11.5
9.5
ns
ns
ns
ns
ns
ns
Units
AC Electrical Characteristics for ACT
V
CC
Symbol
Parameter
(V)
(Note 8)
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Propagation Delay
Data to Output
Propagation Delay
Data to Output
Output Enable Time
Output Enable Time
Output Disable Time
Output Disable Time
5.0
5.0
5.0
5.0
5.0
5.0
Min
2.0
2.0
1.5
2.0
2.0
2.5
T
A
= +25°C
C
L
=
50 pF
Typ
6.5
7.0
6.0
7.0
7.0
7.5
Max
9.0
9.0
8.5
9.5
9.5
10.0
T
A
= −55°C
to
+125°C
T
A
= −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
9.5
11.0
11.0
11.5
C
L
=
50 pF
Min
1.5
1.5
1.0
1.5
1.5
2.0
Max
10.0
10.0
9.5
10.5
10.5
10.5
ns
ns
ns
ns
ns
ns
Units
Note 8:
Voltage Range 5.0 is 5.0V
±
0.5V
Capacitance
Symbol
C
IN
C
PD
Parameter
Input Capacitance
Power Dissipation Capacitance
Typ
4.5
45.0
Units
pF
pF
V
CC
=
OPEN
V
CC
=
5.0V
Conditions
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