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54ABT244
Octal Buffer/Line Driver with TRI-STATE
Outputs
General Description
The 'ABT244 is an octal buffer and line driver with
TRI-STATE outputs designed to be employed as a memory
and address driver, clock driver, or bus-oriented transmitter/
receiver.
Features
n
Non-inverting buffers
n
Output sink capability of 48 mA, source capability of
24 mA
n
Output switching specified for both 50 pF and 250 pF
loads
n
Guaranteed simultaneous switching, noise level and
dynamic threshold performance
n
Guaranteed latchup protection
n
High impedance glitch free bus loading during entire
power up and power down cycle
n
Nondestructive hot insertion capability
n
Disable time less than enable time to avoid bus
contention
n
Standard Microcircuit Drawing (SMD) 5962-9214701
Ordering Code
Military
Package
Package Description
Number
54ABT244J-QML
J20A
20-Lead Ceramic Dual-In-Line
54ABT244W-QML
W20A
20-Lead Cerpack
54ABT244E-QML
E20A
20-Lead Ceramic Leadless Chip Carrier, Type C
Connection Diagrams
Pin
Names
Description
OE
1
, OE
2
Output Enable Input
(Active Low)
I
0
I
7
Inputs
O
0
O
7
Outputs
Truth Table
OE
1
I
03
O
03
OE
2
I
47
O
47
H
X
Z
H
X
Z
L
H
H
L
H
H
L
L
L
L
L
L
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Z = High Impedance
TRI-STATE
is a registered trademark of National Semiconductor Corporation.
Pin Assignment for
DIP and Flatpak
DS100203-1
Pin Assignment for LCC
DS100203-2
July 1998
54ABT244
Octal
Buffer/Line
Driver
with
TRI-ST
A
T
E
Outputs
1998 National Semiconductor Corporation
DS100203
www.national.com
Absolute Maximum Ratings
(Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Storage Temperature
-65C to +150C
Ambient Temperature under Bias
-55C to +125C
Junction Temperature under Bias
Ceramic
-55C to +175C
V
CC
Pin Potential to Ground Pin
-0.5V to +7.0V
Input Voltage (Note 2)
-0.5V to +7.0V
Input Current (Note 2)
-30 mA to +5.0 mA
Voltage Applied to Any Output
in the Disabled or
Power-Off State
-0.5V to 5.5V
in the HIGH State
-0.5V to V
CC
Current Applied to Output
in LOW State (Max)
twice the rated I
OL
(mA)
DC Latchup Source Current
-500 mA
Over Voltage Latchup (I/O)
10V
Recommended Operating
Conditions
Free Air Ambient Temperature
Military
-55C to +125C
Supply Voltage
Military
+4.5V to +5.5V
Minimum Input Edge Rate
(
V/
t)
Data Input
50 mV/ns
Enable Input
20 mV/ns
DC Electrical Characteristics
Symbol
Parameter
ABT244
Units
V
CC
Conditions
Min Typ
Max
V
IH
Input HIGH Voltage
2.0
V
Recognized HIGH Signal
V
IL
Input LOW Voltage
0.8
V
Recognized LOW Signal
V
CD
Input Clamp Diode Voltage
-1.2
V
Min
I
IN
= -18 mA
V
OH
Output HIGH Voltage
54ABT
2.5
V
Min
I
OH
= -3 mA
54ABT
2.0
V
Min
I
OH
= -24 mA
V
OL
Output LOW Voltage
54ABT
0.55
V
Min
I
OL
= 48 mA
I
IH
Input HIGH Current
5
A
Max
V
IN
= 2.7V (Note 4)
5
V
IN
= V
CC
I
BVI
Input HIGH Current Breakdown Test
7
A
Max
V
IN
= 7.0V
I
IL
Input LOW Current
-5
A
Max
V
IN
= 0.5V (Note 4)
-5
V
IN
= 0.0V
V
ID
Input Leakage Test
4.75
V
0.0
I
ID
= 1.9 A
All Other Pins Grounded
I
OZH
Output Leakage Current
50
A
0 - 5.5V
V
OUT
= 2.7V; OE
n
= 2.0V
I
OZL
Output Leakage Current
-50
A
0 - 5.5V
V
OUT
= 0.5V; OE
n
= 2.0V
I
OS
Output Short-Circuit Current
-100
-275
mA
Max
V
OUT
= 0.0V
I
CEX
Output High Leakage Current
50
A
Max
V
OUT
= V
CC
I
ZZ
Bus Drainage Test
100
A
0.0
V
OUT
= 5.5V; All Others GND
I
CCH
Power Supply Current
50
A
Max
All Outputs HIGH
I
CCL
Power Supply Current
30
mA
Max
All Outputs LOW
I
CCZ
Power Supply Current
50
A
Max
OE
n
= V
CC
;
All Others at V
CC
or Ground
I
CCT
Additional I
CC
/Input
Outputs Enabled
2.5
mA
Max
V
I
= V
CC
- 2.1V
Outputs TRI-STATE
2.5
mA
Enable Input V
I
= V
CC
- 2.1V
Outputs TRI-STATE
50
A
Data Input V
I
= V
CC
- 2.1V
All Others at V
CC
or Ground
I
CCD
Dynamic I
CC
No Load
mA/
Max
Outputs Open
(Note 4)
0.1
MHz
OE
n
= GND, (Note 3)
One Bit Toggling, 50% Duty Cycle
Note 1: Absolute maximum ratings are values beyond which the device may be damaged or have its useful life impaired. Functional operation under these conditions
is not implied.
Note 2: Either voltage limit or current limit is sufficient to protect inputs.
Note 3: For 8 bits toggling, I
CCD
<
0.8 mA/MHz.
Note 4: Guaranteed, but not tested.
www.national.com
2
AC Electrical Characteristics
Symbol
Parameter
54ABT
Units
Fig.
No.
T
A
= -55C to +125C
V
CC
= 4.5V5.5V
C
L
= 50 pF
Min
Max
t
PLH
Propagation Delay
1.0
5.3
ns
Figure 5
t
PHL
Data to Outputs
1.0
5.0
t
PZH
Output Enable
0.8
6.5
ns
Figure 4
t
PZL
Time
1.2
7.9
t
PHZ
Output Disable
1.2
7.6
ns
Figure 4
t
PLZ
Time
1.0
7.9
Capacitance
Symbol
Parameter
Typ
Units
Conditions
T
A
= 25C
C
IN
Input Capacitance
5.0
pF
V
CC
= 0V
C
OUT
(Note 5)
Output Capacitance
9.0
pF
V
CC
= 5.0V
Note 5: C
OUT
is measured at frequency f = 1 MHz, per MIL-STD-883B, Method 3012.
t
PLH
vs Temperature (T
A
)
C
L
= 50 pF, 1 Output Switching
DS100203-11
t
PHL
vs Temperature (T
A
)
C
L
= 50 pF, 1 Output Switching
DS100203-12
Dashed lines represent design characteristics; for specified guarantees refer to AC Characteristics Table.
3
www.national.com
Capacitance
(Continued)
t
PLH
vs Load Capacitance
1 Output Switching, T
A
= 25C
DS100203-13
t
PHL
vs Load Capacitance
1 Output Switching, T
A
= 25C
DS100203-14
t
PLH
vs Load Capacitance
8 Outputs Switching, T
A
= 25C
DS100203-15
t
PHL
vs Load Capacitance
8 Outputs Switching, T
A
= 25C
DS100203-16
t
PZL
vs Temperature (T
A
)
C
L
= 50 pF, 1 Output Switching
DS100203-17
t
PLZ
vs Temperature (T
A
)
C
L
= 50 pF, 1 Output Switching
DS100203-18
Dashed lines represent design characteristics; for specified guarantees refer to AC Characteristics Table.
www.national.com
4
Capacitance
(Continued)
t
PZH
vs Temperature (T
A
)
C
L
= 50 pF, 1 Output Switching
DS100203-19
t
PHZ
vs Temperature (T
A
)
C
L
= 50 pF, 1 Output Switching
DS100203-20
t
PZH
vs Temperature (T
A
)
C
L
= 50 pF, 8 Outputs Switching
DS100203-21
t
PHZ
vs Temperature (T
A
)
C
L
= 50 pF, 8 Outputs Switching
DS100203-22
t
PZL
vs Temperature (T
A
)
C
L
= 50 pF, 8 Outputs Switching
DS100203-23
t
PLZ
vs Temperature (T
A
)
C
L
= 50 pF, 8 Outputs Switching
DS100203-24
Dashed lines represent design characteristics; for specified guarantees refer to AC Characteristics Table.
5
www.national.com