54AC244/54ACT244 Octal Buffer/Line Driver with TRI-STATE Outputs
July 2003
54AC244/54ACT244
Octal Buffer/Line Driver with TRI-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.
n
Outputs source/sink 24 mA
n
’ACT244 has TTL-compatible inputs
n
Standard Microcircuit Drawing (SMD)
— ’AC244: 5962-87552
— ’ACT244: 5962-87760
n
54AC244 now qualified to 300Krad RHA designation,
refer to the SMD for more information
Features
n
I
CC
and I
OZ
reduced by 50%
n
TRI-STATE outputs drive bus lines or buffer memory
address registers
Logic Symbol
IEEE/IEC
Pin Names
OE
1
, OE
2
I
0
–I
7
O
0
–O
7
Inputs
Outputs
Description
TRI-STATE Output Enable Inputs
10028201
TRI-STATE
®
is a registered trademark of National Semiconductor Corporation.
FACT
®
is a registered trademark of Fairchild Semiconductor Corporation.
© 2003 National Semiconductor Corporation
DS100282
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54AC244
•
54ACT244
Connection Diagrams
Pin Assignment for DIP
and Flatpak
Truth Tables
Inputs
OE
1
L
L
H
I
n
L
H
X
Outputs
(Pins 12, 14, 16, 18)
L
H
Z
H = HIGH Voltage Level
L = LOW Voltage Level
Inputs
OE
2
L
L
H
10028202
Outputs
(Pins 3, 5, 7, 9)
L
H
Z
I
n
L
H
X
X = Immaterial
Z = High Impedance
Pin Assignment for LCC
10028203
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2
54AC244
•
54ACT244
Absolute Maximum Ratings
(Note 1)
’ACT
Input Voltage (V
I
)
Output Voltage (V
O
)
Operating Temperature (T
A
)
54AC/ACT
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
4.5V to 5.5V
0V to V
CC
0V to V
CC
−55˚C to +125˚C
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
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
)
CDIP
175˚C
−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
125 mV/ns
125 mV/ns
±
50 mA
±
50 mA
−65˚C to +150˚C
Note 1:
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. National does not recom-
mend operation of FACT
®
circuits outside databook specifications.
Recommended Operating
Conditions
Supply Voltage (V
CC
)
’AC
2.0V to 6.0V
DC Characteristics for ’AC Family Devices
54AC
Symbol
Parameter
V
CC
(V)
V
IH
Minimum High
Level Input
Voltage
V
IL
Maximum Low
Level Input
Voltage
V
OH
Minimum High
Level Output
Voltage
3.0
4.5
5.5
3.0
4.5
5.5
3.0
4.5
5.5
T
A
=
−55˚C to +125˚C
Guaranteed Limits
2.1
3.15
3.85
0.9
1.35
1.65
2.9
4.4
5.4
(Note 2)
V
IN
= V
IL
or V
IH
3.0
4.5
5.5
2.4
3.7
4.7
V
I
OH
−12 mA
−24 mA
−24 mA
V
I
OUT
= −50 µA
V
V
OUT
= 0.1V
or V
CC
− 0.1V
V
V
OUT
= 0.1V
or V
CC
− 0.1V
Units
Conditions
3
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54AC244
•
54ACT244
DC Characteristics for ’AC Family Devices
Symbol
Parameter
V
CC
(V)
V
OL
Maximum Low
Level Output
Voltage
3.0
4.5
5.5
T
A
=
(Continued)
54AC
Units
Conditions
−55˚C to +125˚C
Guaranteed Limits
0.1
0.1
0.1
(Note 2)
V
IN
= V
IL
or V
IH
3.0
4.5
5.5
I
IN
I
OZ
Maximum Input
Leakage Current
Maximum
TRI-STATE
Current
I
OLD
I
OHD
I
CC
(Note 3) Minimum
Dynamic Output
Current
Maximum Quiescent
Supply Current
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
.
Note 5:
I
CC
for 54AC
@
25˚C is identical to 74AC
@
25˚C.
I
OUT
= 50 µA
V
0.50
0.50
0.50
V
µA
I
OL
V
I
= V
CC
, GND
V
I
(OE) = V
IL
, V
IH
12 mA
24 mA
24 mA
5.5
±
1.0
5.5
5.5
5.5
5.5
±
5.0
50
−50
80.0
µA
mA
mA
µA
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
DC Characteristics for ’ACT Family Devices
54ACT
Symbol
Parameter
V
CC
(V)
V
IH
V
IL
V
OH
Minimum High Level
Input Voltage
Maximum Low Level
Input Voltage
Minimum High Level
Output Voltage
4.5
5.5
4.5
5.5
4.5
5.5
T
A
=
−55˚C to +125˚C
Guaranteed Limits
2.0
2.0
0.8
0.8
4.4
5.4
(Note 6)
V
IN
= V
IL
or V
IH
4.5
5.5
V
OL
Maximum Low Level
Output Voltage
4.5
5.5
3.70
4.70
0.1
0.1
(Note 6)
V
IN
= V
IL
or V
IH
4.5
5.5
I
IN
I
OZ
Maximum Input Leakage Current
Maximum TRI-STATE
5.5
5.5
0.50
0.50
V
µA
µA
I
OL
V
I
= V
CC
, GND
V
I
= V
IL
, V
IH
24 mA
24 mA
V
I
OUT
= 50 µA
V
I
OH
−24 mA
−24 mA
V
V
V
V
OUT
= 0.1V
or V
CC
− 0.1V
V
OUT
= 0.1V
or V
CC
− 0.1V
I
OUT
= −50 µA
Units
Conditions
±
1.0
±
5.0
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4
54AC244
•
54ACT244
DC Characteristics for ’ACT Family Devices
Symbol
Parameter
V
CC
(V)
Current
I
CCT
I
OLD
I
OHD
I
CC
Maximum I
CC
/Input
(Note 7) Minimum
Dynamic Output
Current
Maximum Quiescent
Supply Current
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.
Note 8:
I
CC
for 54ACT
@
25˚C is identical to 74ACT
@
25˚C.
(Continued)
54ACT
T
A
=
−55˚C to +125˚C
Guaranteed Limits
V
O
= V
CC
, GND
5.5
5.5
5.5
5.5
1.6
50
−50
80.0
mA
mA
mA
µA
V
I
= V
CC
− 2.1V
V
OLD
= 1.65V Max
V
OHD
= 3.85V Min
V
IN
= V
CC
or GND
Units
Conditions
5
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