Revised March 2005
74AC244 • 74ACT244
Octal Buffer/Line Driver with 3-STATE Outputs
General Description
Features
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.
■ ICC and IOZ reduced by 50%
■ 3-STATE outputs drive bus lines or buffer memory
address registers
■ Outputs source/sink 24 mA
■ ACT244 has TTL-compatible inputs
Ordering Code:
Order Number
Package
Package Description
Number
74AC244SC
M20B
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
74AC244SCX_NL
(Note 1)
M20B
Pb-Free 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
74AC244SJ
M20D
Pb-Free 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74AC244MTC
MTC20
20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
74AC244MTCX_NL
(Note 1)
MTC20
Pb-Free 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm
Wide
74AC244PC
N20A
74ACT244SC
M20B
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
74ACT244SCX_NL
(Note 1)
M20B
Pb-Free 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
74ACT244SJ
74ACT244MSA
M20D
MSA20
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide
Pb-Free 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
20-Lead Shrink Small Outline Package (SSOP), JEDEC MO-150, 5.3mm Wide
74ACT244MTC
MTC20
20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
74ACT244MTCX_NL
(Note 1)
MTC20
Pb-Free 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm
Wide
74ACT244PC
N20A
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.
Pb-Free package per JEDEC J-STD-020B.
Note 1: “_NL” indicates Pb-Free package (per JEDEC J-STD-020B). Please use order number as indicated.
FACT¥ is a trademark of Fairchild Semiconductor Corporation.
© 2005 Fairchild Semiconductor Corporation
DS009943
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74AC244 • 74ACT244 Octal Buffer/Line Driver with 3-STATE Outputs
November 1988
74AC244 • 74ACT244
Pin Descriptions
Logic Symbol
Pin Names
IEEE/IEC
Description
OE1, OE2
3-STATE Output Enable Inputs
I0–I7
Inputs
O0–O7
Outputs
Truth Tables
Inputs
L
L
L
H
H
H
X
Z
In
(Pins 3, 5, 7, 9)
Inputs
OE2
X
Z
2
(Pins 12, 14, 16, 18)
L
Connection Diagram
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Outputs
In
OE1
Outputs
L
L
L
L
H
H
H
X
Z
Immaterial
High Impedance
Recommended Operating
Conditions
0.5V to 7.0V
Supply Voltage (VCC)
DC Input Diode Current (IIK)
VI
VI
0.5V
VCC 0.5V
Supply Voltage (VCC)
20 mA
20 mA
0.5V to VCC 0.5V
DC Input Voltage (VI)
DC Output Diode Current (IOK)
VO
VO
0.5V
VCC 0.5V
20 mA
20 mA
0.5V to VCC 0.5V
DC Output Voltage (VO)
0V to VCC
40qC to 85qC
VIN from 30% to 70% of VCC
VCC @ 3.3V, 4.5V, 5.5V
125 mV/ns
Minimum Input Edge Rate ('V/'t)
r50 mA
65qC to 150qC
ACT Devices
VIN from 0.8V to 2.0V
Junction Temperature (TJ)
VCC @ 4.5V, 5.5V
140qC
PDIP
0V to VCC
Output Voltage (VO)
AC Devices
DC VCC or Ground Current
per Output Pin (ICC or IGND)
4.5V to 5.5V
Input Voltage (VI)
Operating Temperature (TA)
r50 mA
Storage Temperature (TSTG)
2.0V to 6.0V
ACT
Minimum Input Edge Rate ('V/'t)
DC Output Source
or Sink Current (IO)
AC
125 mV/ns
Note 2: Absolute maximum ratings are those values beyond which damage
to the device may occur. The databook specifications should be met, without 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.
DC Electrical Characteristics for AC
Symbol
VIH
VIL
VOH
VOL
IIN
25qC
55qC to 125qC TA
40qC to 85qC
VCC
TA
(V)
Typ
Minimum HIGH Level
3.0
1.5
2.1
2.1
2.1
Input Voltage
4.5
2.25
3.15
3.15
3.15
3.85
Parameter
TA
Guaranteed Limits
5.5
2.75
3.85
3.85
Maximum LOW Level
3.0
1.5
0.9
0.9
0.9
Input Voltage
4.5
2.25
1.35
1.35
1.35
1.65
5.5
2.75
1.65
1.65
Minimum HIGH Level
3.0
2.99
2.9
2.9
2.9
Output Voltage
4.5
4.49
4.4
4.4
4.4
5.5
5.49
5.4
5.4
5.4
3.0
2.56
2.4
2.46
4.5
3.86
3.7
3.76
5.5
4.86
4.7
4.76
Maximum LOW Level
3.0
0.002
0.1
0.1
0.1
Output Voltage
4.5
0.001
0.1
0.1
0.1
5.5
0.001
0.1
0.1
0.1
Maximum Input
(Note 5)
Leakage Current
IOZ
Maximum
3-STATE
Units
Conditions
VOUT
0.1V
or VCC 0.1V
V
VOUT
0.1V
V
or VCC 0.1V
V
IOUT
V
50 PA
IOH
12 mA
IOH
24 mA
IOH
24 mA (Note 3)
50 PA
V
IOUT
IOL
12 mA
V
IOL
24 mA
3.0
0.36
0.50
0.44
4.5
0.36
0.50
0.44
5.5
0.36
0.50
0.44
5.5
r0.1
r1.0
r1.0
PA
5.5
r0.25
r5.0
r2.5
PA
IOL
VI
24 mA (Note 3)
VCC, GND
VI (OE)
Current
VCC, VGND
VO
VCC, GND
IOLD
Minimum Dynamic
5.5
50
75
mA
VOLD
IOHD
Output Current (Note 4)
5.5
50
75
mA
VOHD
ICC
Maximum Quiescent
5.5
80.0
40.0
PA
VIN
(Note 5)
4.0
Supply Current
VIL, VIH
VI
1.65V Max
3.85V Min
VCC
or GND
Note 3: All outputs loaded; thresholds on input associated with output under test.
Note 4: Maximum test duration 2.0 ms, one output loaded at a time.
Note 5: IIN and ICC @ 3.0V are guaranteed to be less than or equal to the respective limit @ 5.5V VCC.
3
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74AC244 • 74ACT244
Absolute Maximum Ratings(Note 2)
74AC244 • 74ACT244
DC Electrical Characteristics for ACT
Symbol
VIH
VIL
VOH
25qC
TA
55qC to 125qC TA 40qC to 85qC
VCC
TA
(V)
Typ
Minimum HIGH Level
4.5
1.5
2.0
2.0
2.0
Input Voltage
5.5
1.5
2.0
2.0
2.0
Maximum LOW Level
4.5
1.5
0.8
0.8
0.8
Input Voltage
5.5
1.5
0.8
0.8
0.8
Parameter
Guaranteed Limits
Minimum HIGH Level
4.5
4.49
4.4
4.4
4.4
Output Voltage
5.5
5.49
5.4
5.4
5.4
4.5
3.86
3.70
3.76
5.5
4.86
4.70
4.76
Units
V
V
V
Conditions
VOUT
0.1V
or VCC 0.1V
VOUT
0.1V
or VCC 0.1V
50 PA
IOUT
IOH
VOL
IIN
V
12
IOH
24 mA
IOH
24 mA (Note 6)
50 PA
Maximum LOW Level
4.5
0.001
0.1
0.1
0.1
Output Voltage
5.5
0.001
0.1
0.1
0.1
4.5
0.36
0.50
0.44
5.5
0.36
0.50
0.44
5.5
r0.1
r1.0
r1.0
PA
VI
VCC, GND
5.5
r0.25
r5.0
r2.5
PA
VI
VIL, VIH
Maximum Input
V
V
IOUT
IOL
12 mA
IOL
24 mA
IOL
24 mA (Note 6)
Leakage Current
IOZ
Maximum 3-STATE
Current
ICCT
Maximum
5.5
0.6
1.6
VO
VCC, GND
VCC 2.1V
1.5
mA
VI
ICC/Input
IOLD
Minimum Dynamic
5.5
50
75
mA
VOLD
IOHD
Output Current (Note 7)
5.5
50
75
mA
VOHD
ICC
Maximum Quiescent
5.5
80.0
40.0
PA
VIN
4.0
Supply Current
3.85V Min
VCC
or GND
Note 6: All outputs loaded; thresholds on input associated with output under test.
Note 7: Maximum test duration 2.0 ms, one output loaded at a time.
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1.65V Max
4
Symbol
tPLH
tPHL
tPZH
tPZL
Parameter
25qC
CL
50 pF
TA
55qC to 125qC TA
40qC to 85qC
CL
CL
50 pF
50 pF
Min
Typ
Max
Min
Max
Min
Max
Propagation Delay
3.3
2.0
6.5
9.0
1.0
12.5
1.5
10.0
Data to Output
5.0
1.5
5.0
7.0
1.0
9.5
1.0
7.5
Propagation Delay
3.3
2.0
6.5
9.0
1.0
12.0
2.0
10.0
Data to Output
5.0
1.5
5.0
7.0
1.0
9.0
1.0
7.5
Output Enable Time
3.3
2.0
6.0
10.5
1.0
11.5
1.5
11.0
5.0
1.5
5.0
7.0
1.0
9.0
1.5
8.0
3.3
2.5
7.5
10.0
1.0
13.0
2.0
11.0
5.0
1.5
5.5
8.0
1.0
10.5
1.5
8.5
3.3
3.0
7.0
10.0
1.0
12.5
1.5
10.5
5.0
2.5
6.5
9.0
1.0
10.5
1.0
9.5
3.3
2.5
7.5
10.5
1.0
13.0
2.5
11.5
5.0
2.0
6.5
9.0
1.0
11.0
2.0
9.5
Output Disable Time
tPLZ
TA
(V)
(Note 8)
Output Enable Time
tPHZ
VCC
Output Disable Time
Units
ns
ns
ns
ns
ns
ns
Note 8: Voltage Range 3.3 is 3.3V r 0.3V
Voltage Range 5.0 is 5.0V r 0.5V
AC Electrical Characteristics for ACT
Symbol
tPLH
VCC
TA
25qC
(V)
CL
50 pF
Parameter
TA
55qC to 125qC TA
40qC to 85qC
CL
CL
50 pF
50 pF
Units
(Note 9)
Min
Typ
Max
Min
Max
Min
Max
5.0
2.0
6.5
9.0
1.0
10.0
1.5
10.0
ns
5.0
2.0
7.0
9.0
1.0
10.0
1.5
10.0
ns
Propagation Delay
Data to Output
tPHL
Propagation Delay
Data to Output
tPZH
Output Enable Time
5.0
1.5
6.0
8.5
1.0
9.5
1.0
9.5
ns
tPZL
Output Enable Time
5.0
2.0
7.0
9.5
1.0
11.0
1.5
10.5
ns
tPHZ
Output Disable Time
5.0
2.0
7.0
9.5
1.0
11.0
1.5
10.5
ns
tPLZ
Output Disable Time
5.0
2.5
7.5
10.0
1.0
11.5
2.0
10.5
ns
Note 9: Voltage Range 5.0 is 5.0V r 0.5V
Capacitance
Typ
Units
CIN
Symbol
Input Capacitance
Parameter
4.5
pF
VCC
OPEN
CPD
Power Dissipation Capacitance
45.0
pF
VCC
5.0V
5
Conditions
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74AC244 • 74ACT244
AC Electrical Characteristics for AC
74AC244 • 74ACT244
Physical Dimensions inches (millimeters) unless otherwise noted
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
Package Number M20B
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6
74AC244 • 74ACT244
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
Pb-Free 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
Package Number M20D
7
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74AC244 • 74ACT244
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
20-Lead Shrink Small Outline Package (SSOP), JEDEC MO-150, 5.3mm Wide
Package Number MSA20
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8
74AC244 • 74ACT244
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
Package Number MTC20
9
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74AC244 • 74ACT244 Octal Buffer/Line Driver with 3-STATE Outputs
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide
Package Number N20A
Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and
Fairchild reserves the right at any time without notice to change said circuitry and specifications.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD
SEMICONDUCTOR CORPORATION. As used herein:
2. A critical component in any component of a life support
device or system whose failure to perform can be reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the
body, or (b) support or sustain life, and (c) whose failure
to perform when properly used in accordance with
instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the
user.
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10