54AC541.pdf
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124 KB
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Pobierz
July 1998
54AC541
Octal Buffer/Line Driver with TRI-STATE
®
Outputs
General Description
The ’AC541 is an octal buffer/line driver designed to be em-
ployed as memory and address drivers, clock drivers and
bus oriented transmitter/receivers. The ’AC541 is a nonin-
verting option of the ’AC540.
This device is similar in function to the ’AC244 while provid-
ing flow-through architecture (inputs on opposite side from
outputs). This pinout arrangement makes this device espe-
cially useful as an output port for microprocessors, allowing
ease of layout and greater PC board density.
Features
n
I
CC
and I
OZ
reduced by 50%
n
TRI-STATE outputs
n
Inputs and outputs opposite side of package, allowing
easier interface to microprocessors
n
Output source/sink 24 mA
n
’AC540 provides inverted outputs
n
Standard Military Drawing (SMD)
— ’AC541: 5962-88706
Logic Symbol
IEEE/IEC
DS100330-3
Truth Table
In
put
s
Outputs
OE
1
OE
2
I
L
L
H
H
H
X
X
Z
X
H
X
Z
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.
FACT
™
is a trademark of Fairchild Semiconductor Corporation.
www.national.com
© 1998 National Semiconductor Corporation
DS100330
Connection Diagrams
Pin Assignment
for LCC
Pin Assignment
for DIP and Flatpak
DS100330-1
DS100330-2
www.national.com
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.
Supply Voltage (V
CC
)
Junction Temperature (T
J
)
CDIP
175˚C
Recommended Operating
Conditions
Supply Voltage (V
CC
)
’AC
−0.5V to +7.0V
DC Input Diode Current (I
IK
)
V
I
=
−0.5V
−20 mA
2.0V to 6.0V
V
I
=
V
CC
+ 0.5V
+20 mA
Input Voltage (V
I
)
0VtoV
CC
DC Input Voltage (V
I
)
−0.5V to V
CC
+ 0.5V
Output Voltage (V
O
)
0VtoV
CC
DC Output Diode Current (I
OK
)
V
O
=
−0.5V
Operating Temperature (T
A
)
54AC
−20 mA
−55˚C to +125˚C
V
O
=
V
CC
+ 0.5V
+20 mA
Minimum Input Edge Rate (
D
V/
D
t)
DC Output Voltage (V
O
)
−0.5V to V
CC
+ 0.5V
’AC Devices
V
IN
from 30% to 70% of V
CC
V
CC
@
3.3V, 4.5V, 5.5V 125 mV/ns
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.
DC Characteristics for ’AC Family Devices
54AC
DC Output Source
or Sink Current (I
O
)
±
50 mA
DC V
CC
or Ground Current
per Output Pin (I
CC
or I
GND
)
±
50 mA
Storage Temperature (T
STG
)
−65˚C to +150˚C
T
A
=
Symbol
Parameter
V
CC
Units
Conditions
(V)
−55˚C to +125˚C
Guaranteed Limits
V
OUT
=
0.1V
V
IH
Minimum High Level
3.0
2.1
Input Voltage
4.5
3.15
V
or V
CC
− 0.1V
5.5
3.85
V
OUT
=
0.1V
V
IL
Maximum Low Level
3.0
0.9
Input Voltage
4.5
1.35
V
or V
CC
− 0.1V
5.5
1.65
I
OUT
=
−50 µA
V
OH
Minimum High Level
3.0
2.9
Output Voltage
4.5
4.4
V
5.5
5.4
(Note 2)
V
IN
=
V
IL
or V
IH
3.0
2.4
V
I
OH
= −12 mA
4.5
3.7
I
OH
= −24 mA
5.5
4.7
I
OH
= −24 mA
I
OUT
=
50 µA
V
OL
Maximum Low Level
3.0
0.1
Output Voltage
4.5
0.1
V
5.5
0.1
(Note 2)
V
IN
= V
IL
or V
IH
3.0
0.50
V
I
OL
=12mA
4.5
0.50
I
OL
=24mA
5.5
0.50
I
OL
=24mA
±
1.0
I
IN
Maximum Input
5.5
µA
V
I
= V
CC
, GND
Leakage Current
I
OZ
Maximum TRI-STATE
V
I
(OE) = V
IL
,V
IH
±
5.0
Leakage Current
5.5
µA
V
I
= V
CC
, GND
V
O
= V
CC
, GND
3
www.national.com
DC Characteristics for ’AC Family Devices
(Continued)
54AC
T
A
=
Symbol
Parameter
V
CC
Units
Conditions
(V)
−55˚C to +125˚C
Guaranteed Limits
V
OLD
=
1.65V Max
I
OLD
Minimum Dynamic
Output Current
(Note 3)
5.5
50
mA
I
OHD
5.5
−50
mA
V
OHD
= 3.85V Min
I
CC
Maximum Quiescent
5.5
80.0
µA
V
IN
= V
CC
Supply Current
or GND
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
.
I
CC
for 54AC
@
25˚C is identical to 74AC
@
25˚C.
AC Electrical Characteristics
54AC
T
A
=
−55˚C
V
CC
Fig.
Symbol
Parameter
(V)
to +125˚C
Units
No.
C
L
=
50 pF
(Note 5)
Min
Max
t
PLH
Propagation Delay
3.3
1.0
10.0
ns
Data to Output
5.0
1.5
7.0
t
PHL
Propagation Delay
3.3
1.0
9.5
ns
Data to Output
5.0
1.5
7.0
t
PZH
Output Enable Time
3.3
1.0
13.5
ns
5.0
1.5
10.0
t
PZL
Output Enable Time
3.3
1.0
12.5
ns
5.0
1.5
9.0
t
PHZ
Output Disable Time
3.3
1.0
15.0
ns
5.0
1.5
12.0
t
PLZ
Output Disable Time
3.3
1.0
11.0
ns
5.0
1.5
9.0
Note 5:
Voltage Range 3.3 is 3.3V
±
0.3V
Voltage Range 5.0 is 5.0V
±
0.5V
Capacitance
Symbol
Parameter
Typ
Units
Conditions
V
CC
=
OPEN
C
IN
Input Capacitance
4.5
pF
V
CC
=
5.0V
C
PD
Power Dissipation Capacitance
30.0
pF
www.national.com
4
Physical Dimensions
inches (millimeters) unless otherwise noted
20 Terminal Ceramic Leadless Chip Carrier (L)
NS Package Number E20A
20 Lead Ceramic Dual-In-Line Package (D)
NS Package Number J20A
5
www.national.com
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