54ACTQ16244 16-Bit Buffer/Line Driver with TRI-STATE Outputs
September 1998
54ACTQ16244
16-Bit Buffer/Line Driver with TRI-STATE
®
Outputs
General Description
The ’ACTQ16244 contains sixteen non-inverting buffers with
TRI-STATE outputs designed to be employed as a memory
and address driver, clock driver, or bus oriented transmitter/
receiver. The device is nibble controlled. Each nibble has
separate TRI-STATE control inputs which can be shorted to-
gether for full 16-bit operation.
The ’ACTQ16244 utilizes NSC Quiet Series technology to
guarantee quiet output switching and improved dynamic
threshold performance. FACT Quiet Series
®
features GTO
®
output control for superior performance.
Features
n
Utilizes NSC FACT Quiet Series technology
n
Guaranteed simultaneous switching noise level and
dynamic threshold performance
n
Separate control logic for each byte and nibble
n
16-bit version of the ’ACTQ244
n
Outputs source/sink 24 mA
n
Standard Microcircuit Drawing (SMD) 5962-9561901
Logic Symbol
Connection Diagram
Pin Assignment for CERPAK
DS010925-1
Pin Description
Pin Names
OE
n
I
0
–I
15
O
0
–O
15
Inputs
Outputs
Description
Output Enable Input (Active Low)
DS010925-2
GTO
™
is a trademark of National Semiconductor Corporation.
TRI-STATE
®
is a registered trademark of National Semiconductor Corporation.
FACT
™
and FACT Quiet Series
™
are trademarks of Fairchild Semiconductor Corporation.
© 1998 National Semiconductor Corporation
DS010925
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Functional Description
The ’ACTQ16244 contains sixteen non-inverting buffers with
TRI-STATE standard outputs. The device is nibble (4 bits)
controlled with each nibble functioning identically, but inde-
pendent of the other. The control pins can be shorted to-
gether to obtain full 16-bit operation. The TRI-STATE outputs
are controlled by an Output Enable (OE
n
) input for each
nibble. When OE
n
is LOW, the outputs are in 2-state mode.
When OE
n
is HIGH, the outputs are in the high impedance
mode, but this does not interfere with entering new data into
the inputs.
Inputs
OE
3
H
Inputs
OE
2
L
L
H
I
4
–I
7
L
H
X
Inputs
Outputs
I
0
–I
3
L
H
X
Inputs
OE
3
L
L
I
8
–I
11
L
H
O
0
–O
3
L
H
Z
Outputs
O
8
–O
11
L
H
OE
4
L
L
H
H = High Voltage Level
L = Low Voltage Level
X = Immaterial
Z = High Impedance
Outputs
I
8
–I
11
X
O
8
–O
11
Z
Outputs
O
4
–O
7
L
H
Z
Outputs
I
12
–I
15
L
H
X
O
12
–O
15
L
H
Z
Truth Tables
Inputs
OE
1
L
L
H
Logic Diagram
DS010925-3
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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.
Supply Voltage (V
CC
)
DC Input Diode Current (I
IK
)
V
I
= − 0.5V
V
I
= V
CC
+ 0.5V
DC Output Diode Current (I
OK
)
V
O
= −0.5V
V
O
= V
CC
+ 0.5V
DC Output Voltage (V
O
)
DC Output Source/Sink Current (I
O
)
DC V
CC
or Ground Current
per Output Pin
Junction Temperature
C-DIP
Storage Temperature
−0.5V to +7.0V
−20 mA
+20 mA
−20 mA
+20 mA
−0.5V to V
CC
+ 0.5V
±
50 mA
Recommended Operating
Conditions
Supply Voltage (V
CC
)
’ACTQ
Input Voltage (V
I
)
Output Voltage (V
O
)
Operating Temperature (T
A
)
54ACTQ
Minimum Input Edge Rate (dV/dt)
’ACTQ 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
125 mV/ns
±
50 mA
+175˚C
−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.
DC Electrical Characteristics for ’ACTQ Family Devices
Symbol
Parameter
V
CC
(V)
4.5
5.5
4.5
5.5
4.5
5.5
54ACTQ
T
A
= −55˚C to +125˚C
Guaranteed Limits
V
IH
V
IL
V
OH
Minimum High
Input Voltage
Maximum Low
Input Voltage
Minimum High
Output Voltage
2.0
2.0
0.8
0.8
4.4
5.4
(Note 2)
V
IN
= V
IL
or V
IH
4.5
5.5
V
OL
Maximum Low
Output Voltage
4.5
5.5
3.70
4.70
0.1
0.1
(Note 2)
V
IN
= V
IL
or V
IH
4.5
5.5
I
OZ
I
IN
I
CCT
I
CC
I
OLD
I
OHD
V
OLP
V
OLV
Maximum TRI-STATE
Leakage Current
Maximum Input
Leakage Current
Maximum I
CC
/Input
Max Quiescent
Supply Current
Minimum Dynamic
Output Current
(Note 3)
Quiet Output
Maximum Dynamic V
OL
Quiet Output
Minimum Dynamic V
OL
Note 2:
All outputs loaded; thresholds associated with output under test.
Units
Conditions
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
V
V
I
OH
= −24 mA
I
OH
= −24 mA
I
OUT
= 50 µA
0.50
0.50
V
µA
µA
mA
µA
mA
mA
V
I
OH
= 24 mA
I
OH
= 24 mA
V
I
= V
IL
, V
IH
V
O
= V
CC
, GND
V
I
= V
CC
, GND
V
I
= V
CC
−2.1V
V
IN
= V
CC
or GND
(Note 5)
V
OLD
= 1.65V Max
V
OHD
= 3.85V Min
5.5
5.5
5.5
5.5
5.5
±
10.0
±
1.0
1.6
160.0
50
50
5.0
5.0
0.8
-0.8
(Notes 4, 5)
V
(Notes 4, 5)
3
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DC Electrical Characteristics for ’ACTQ Family Devices
Note 3:
Maximum test duration 2.0 ms; one output loaded at a time.
(Continued)
Note 4:
Maximum number of outputs that can switch simultaneously is n. (n − 1) outputs are switched LOW and one output held LOW.
Note 5:
Maximum number of outputs that can switch simultaneously is n. (n − 1) outputs are switched HIGH and one output held HIGH.
Note 6:
Max number of data inputs (n) switching. (n − 1) input switching 0V to 3V (’ACTQ) input under test switching 3V to threshold (V
ILD
)
AC Electrical Characteristics
Symbol
Parameter
V
CC
(V)
(Note 7)
54ACTQ
T
A
=
−55˚C to +125˚C
C
L
= 50 pF
Min
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Propagation Delay
A
n
, B
n
to B
n
, A
n
Output Enable
Time
Output Disable
Time
5.0
5.0
5.0
2.5
2.5
2.5
2.5
2.0
2.0
Max
10.0
9.5
9.5
10.5
9.5
9.5
ns
ns
ns
Units
Note 7:
Voltage Range 5.0 is 5.0V
±
0.5V.
Capacitance
Symbol
C
IN
C
PD
Parameter
Input Pin Capacitance
Power Dissipation
Capacitance
Typ
4.5
95
Units
pF
pF
Conditions
V
CC
= 5.0V
V
CC
= 5.0V
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