54ABT240.pdf
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134 KB
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Pobierz
July 1998
54ABT240
Octal Buffer/Line Driver with TRI-STATE
®
Outputs
General Description
The ’ABT240 is an inverting octal buffer and line driver de-
signed to be employed as a memory address driver, clock
driver and bus oriented transmitter or receiver which pro-
vides improved PC board density.
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
Standard Microcircuit Drawing (SMD) — 5962-9318801
Features
n
Output sink capability of 48 mA, source capability of
24 mA
Ordering Code
Package
Number
Military
Package Description
54ABT240J-QML
J20A
20-Lead Ceramic Dual-In-Line
54ABT240W-QML
W20A
20-Lead Cerpack
54ABT240E-QML
E20A
20-Lead Ceramic Leadless Chip Carrier, Type C
Connection Diagrams
Pin Assignment
for DIP and Flatpak
Pin Assignment
for LCC
DS100202-2
DS100202-1
Pin Names
Description
OE
1
,OE
2
TRI-STATE Output
Enable Inputs
I
0
–I
7
Inputs
O
0
–O
7
Outputs
TRI-STATE
®
is a registered trademark of National Semiconductor Corporation.
www.national.com
© 1998 National Semiconductor Corporation
DS100202
Truth Tables
Inputs
Outputs
(Pins 12, 14, 16, 18)
OE
1
I
n
L
L
H
L
H
L
H
X
Z
Inputs
Outputs
(Pins 3, 5, 7, 9)
OE
2
I
n
L
L
H
L
H
L
H
X
Z
H
=
HIGH Voltage Level
L
=
LOW Voltage Level
X
=
Immaterial
Z
=
High Impedance
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2
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
(Across Comm Operating
Range)
−150 mA
−65˚C to +150˚C
Over Voltage Latchup (I/O)
10V
Ambient Temperature under Bias
−55˚C to +125˚C
Junction Temperature under Bias
Ceramic
Recommended Operating
Conditions
Free Air Ambient Temperature
Military
−55˚C to +175˚C
V
CC
Pin Potential to
Ground Pin
−0.5V to +7.0V
Input Voltage (Note 2)
−0.5V to +7.0V
−55˚C to +125˚C
Input Current (Note 2)
−30 mA to +5.0 mA
Supply Voltage
Military
Voltage Applied to Any Output
in the Disabled or
Power-Off State
+4.5V to +5.5V
Minimum Input Edge Rate
t)
Data Input 50 mV/ns
Enable Input 20 mV/ns
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.
(
V/
D
D
−0.5V to 5.5V
in the HIGH State
−0.5V to V
CC
DC Electrical Characteristics
Symbol
Parameter
ABT240
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
I
IN
=
−18 mA
V
CD
Input Clamp Diode Voltage
−1.2
V
Min
I
OH
=
−3 mA
V
OH
Output HIGH Voltage
54ABT
2.5
V
Min
I
OH
=
−24 mA
54ABT
2.0
V
Min
I
OL
=
48 mA
V
OL
Output LOW Voltage
54ABT
0.55
V
Min
V
IN
=
2.7V (Note 4)
I
IH
Input HIGH Current
5
µA
Max
V
IN
=
V
CC
5
V
IN
=
7.0V
I
BVI
Input HIGH Current Breakdown Test
7
µA
Max
V
IN
=
0.5V (Note 4)
I
IL
Input LOW Current
−5
µA
Max
V
IN
=
0.0V
−5
I
ID
=
1.9 µA
All Other Pins
Gr
ounded
V
ID
Input Leakage Test
4.75
V
0.0
V
OUT
=
2.7V;
OE
n
=
2.0V
I
OZH
Output Leakage Current
50
µA
0 − 5.5V
V
OUT
=
0.5V; OE
n
=
2.0V
I
OZL
Output Leakage Current
−50
µA
0 − 5.5V
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
1.5
mA
Max
V
I
= V
CC
− 2.1V
Outputs TRI-STATE
1.5
mA
Enable Input V
I
= V
CC
− 2.1V
Data Input V
I
=
V
CC
− 2.1V
All Others at V
CC
or Ground
Outputs TRI-STATE
50
µA
I
CCD
Dynamic I
CC
No Load
mA/
Max
Ou
tputs Open
OE
n
=
GND, (Note 3)
One Bit Toggling, 50% Duty Cycle
(Note 4)
0.1
MHz
Note 3:
For 8 bits toggling, I
CCD
<
0.8 mA/MHz.
Note 4:
Guaranteed, but not tested.
3
www.national.com
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
0.8
5.5
ns
Figure 5
t
PHL
Data to Outputs
1.0
5.5
t
PZH
Output Enable
0.8
7.5
ns
Figure 4
t
PZL
Time
0.8
7.7
t
PHZ
Output Disable
1.0
7.5
ns
Figure 4
t
PLZ
Time
1.0
7.2
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.
AC Loading
Amplitude Rep. Rate t
W
t
r
t
f
3.0V 1 MHz 500 ns 2.5 ns 2.5 ns
FIGURE 3. Test Input Signal Requirements
DS100202-3
*Includes jig and probe capacitance
FIGURE 1. Standard AC Test Load
DS100202-4
FIGURE 2. Test Input Signal Levels
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4
AC Waveforms
DS100202-7
FIGURE 5. Propagation Delay Waveforms for
Inverting and Non-Inverting Functions
DS100202-6
FIGURE 4. TRI-STATE Output HIGH
and LOW Enable and Disable Times
5
www.national.com
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