54ABT244.pdf
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Pobierz
July 1998
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.
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
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
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 Assignment for
DIP and Flatpak
Pin Assignment for LCC
DS100203-2
DS100203-1
Truth Table
OE
1
Pin
Names
Description
I
0–3
O
0–3
OE
2
I
4–7
O
4–7
OE
1
,OE
2
Output Enable Input
(Active Low)
HXZ
HXZ
L
HHL
HH
I
0
–I
7
Inputs
L
L
L
L
L
L
O
0
–O
7
Outputs
= HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Z = High Impedance
TRI-STATE
®
is a registered trademark of National Semiconductor Corporation.
www.national.com
© 1998 National Semiconductor Corporation
DS100203
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
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
−65˚C to +150˚C
Recommended Operating
Conditions
Free Air Ambient Temperature
Military
Ambient Temperature under Bias
−55˚C to +125˚C
Junction Temperature under Bias
Ceramic
−55˚C to +175˚C
V
CC
Pin Potential to Ground Pin
−0.5V to +7.0V
−55˚C to +125˚C
Input Voltage (Note 2)
−0.5V to +7.0V
Supply Voltage
Military
Input Current (Note 2)
−30 mA to +5.0 mA
+4.5V to +5.5V
Voltage Applied to Any Output
in the Disabled or
Power-Off State
Minimum Input Edge Rate
(
D
V/
D
t)
Data Input
50 mV/ns
−0.5V to 5.5V
Enable Input
20 mV/ns
in the HIGH State
−0.5V to V
CC
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 µA Max V
IN
= 2.7V (Note 4)
5 V
IN
= V
CC
I
BVI
Input HIGH Current Breakdown Test 7 µA Max V
IN
= 7.0V
I
IL
Input LOW Current −5 µA 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 µA
All Other Pins
Gro
unded
I
OZH
Output Leakage Current 50 µA 0 − 5.5V V
OUT
= 2.7V;
OE
n
= 2.0V
I
OZL
Output Leakage Current −50 µA 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 µA Max V
OUT
= V
CC
I
ZZ
Bus Drainage Test 100 µA 0.0 V
OUT
= 5.5V; All Others GND
I
CCH
Power Supply Current 50 µA Max All Outputs HIGH
I
CCL
Power Supply Current 30 mA Max
All
Outputs LOW
I
CCZ
Power Supply Current 50 µA 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 µA Data Input V
I
=
V
CC
− 2.1V
All Others at V
CC
or Ground
I
CCD
Dynamic I
CC
No Load mA/ Max
Ou
tputs 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
=
−55˚C to +125˚C
V
CC
=
4.5V–5.5V
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
= 25˚C
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
t
PHL
vs Temperature (T
A
)
C
L
= 50 pF, 1 Output Switching
DS100203-11
DS100203-12
Dashed lines represent design characteristics; for specified guarantees refer to AC Characteristics Table.
3
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Capacitance
(Continued)
t
PLH
vs Load Capacitance
1 Output Switching, T
A
=
25˚C
t
PHL
vs Load Capacitance
1 Output Switching, T
A
=
25˚C
DS100203-13
DS100203-14
t
PLH
vs Load Capacitance
8 Outputs Switching, T
A
= 25˚C
t
PHL
vs Load Capacitance
8 Outputs Switching, T
A
=
25˚C
DS100203-15
DS100203-16
t
PZL
vs Temperature (T
A
)
C
L
= 50 pF, 1 Output Switching
t
PLZ
vs Temperature (T
A
)
C
L
= 50 pF, 1 Output Switching
DS100203-17
DS100203-18
Dashed lines represent design characteristics; for specified guarantees refer to AC Characteristics Table.
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4
Capacitance
(Continued)
t
PZH
vs Temperature (T
A
)
C
L
=
50 pF, 1 Output Switching
t
PHZ
vs Temperature (T
A
)
C
L
=
50 pF, 1 Output Switching
DS100203-19
DS100203-20
t
PZH
vs Temperature (T
A
)
C
L
=
50 pF, 8 Outputs Switching
t
PHZ
vs Temperature (T
A
)
C
L
=
50 pF, 8 Outputs Switching
DS100203-21
DS100203-22
t
PZL
vs Temperature (T
A
)
C
L
= 50 pF, 8 Outputs Switching
t
PLZ
vs Temperature (T
A
)
C
L
=
50 pF, 8 Outputs Switching
DS100203-23
DS100203-24
Dashed lines represent design characteristics; for specified guarantees refer to AC Characteristics Table.
5
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