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
Pin Description
Pin Names
Description
OE
n
Output Enable Input (Active Low)
I
0
I
15
Inputs
O
0
O
15
Outputs
Connection Diagram
GTO
TM
is a trademark of National Semiconductor Corporation.
TRI-STATE
is a registered trademark of National Semiconductor Corporation.
FACT
TM
and FACT Quiet Series
TM
are trademarks of Fairchild Semiconductor Corporation.
DS010925-1
Pin Assignment for CERPAK
DS010925-2
September 1998
54ACTQ16244
16-Bit
Buffer/Line
Driver
with
TRI-ST
A
T
E
Outputs
1998 National Semiconductor Corporation
DS010925
www.national.com
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.
Truth Tables
Inputs
Outputs
OE
1
I
0
I
3
O
0
O
3
L
L
L
L
H
H
H
X
Z
Inputs
Outputs
OE
3
I
8
I
11
O
8
O
11
L
L
L
L
H
H
Inputs
Outputs
OE
3
I
8
I
11
O
8
O
11
H
X
Z
Inputs
Outputs
OE
2
I
4
I
7
O
4
O
7
L
L
L
L
H
H
H
X
Z
Inputs
Outputs
OE
4
I
12
I
15
O
12
O
15
L
L
L
L
H
H
H
X
Z
H = High Voltage Level
L = Low Voltage Level
X = Immaterial
Z = High Impedance
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
)
-0.5V to +7.0V
DC Input Diode Current (I
IK
)
V
I
= - 0.5V
-20 mA
V
I
= V
CC
+ 0.5V
+20 mA
DC Output Diode Current (I
OK
)
V
O
= -0.5V
-20 mA
V
O
= V
CC
+ 0.5V
+20 mA
DC Output Voltage (V
O
)
-0.5V to V
CC
+ 0.5V
DC Output Source/Sink Current (I
O
)
50 mA
DC V
CC
or Ground Current
per Output Pin
50 mA
Junction Temperature
C-DIP
+175C
Storage Temperature
-65C to +150C
Recommended Operating
Conditions
Supply Voltage (V
CC
)
'ACTQ
4.5V to 5.5V
Input Voltage (V
I
)
0V to V
CC
Output Voltage (V
O
)
0V to V
CC
Operating Temperature (T
A
)
54ACTQ
-55C to +125C
Minimum Input Edge Rate (dV/dt)
'ACTQ Devices
125 mV/ns
V
IN
from 0.8V to 2.0V
V
CC
@
4.5V, 5.5V
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
TM
circuits outside databook specifications.
DC Electrical Characteristics for 'ACTQ Family Devices
Symbol
Parameter
V
CC
(V)
54ACTQ
Units
Conditions
T
A
= -55C to +125C
Guaranteed Limits
V
IH
Minimum High
4.5
2.0
V
V
OUT
= 0.1V
Input Voltage
5.5
2.0
or V
CC
- 0.1V
V
IL
Maximum Low
4.5
0.8
V
V
OUT
= 0.1V
Input Voltage
5.5
0.8
or V
CC
- 0.1V
V
OH
Minimum High
4.5
4.4
V
I
OUT
= -50 A
Output Voltage
5.5
5.4
(Note 2)
V
IN
= V
IL
or V
IH
4.5
3.70
V
I
OH
= -24 mA
5.5
4.70
I
OH
= -24 mA
V
OL
Maximum Low
4.5
0.1
V
I
OUT
= 50 A
Output Voltage
5.5
0.1
(Note 2)
V
IN
= V
IL
or V
IH
4.5
0.50
V
I
OH
= 24 mA
5.5
0.50
I
OH
= 24 mA
I
OZ
Maximum TRI-STATE
5.5
10.0
A
V
I
= V
IL
, V
IH
Leakage Current
V
O
= V
CC
, GND
I
IN
Maximum Input
5.5
1.0
A
V
I
= V
CC
, GND
Leakage Current
I
CCT
Maximum I
CC
/Input
5.5
1.6
mA
V
I
= V
CC
-2.1V
I
CC
Max Quiescent
5.5
160.0
A
V
IN
= V
CC
or GND
Supply Current
(Note 5)
I
OLD
Minimum Dynamic
Output Current
(Note 3)
5.5
50
mA
V
OLD
= 1.65V Max
I
OHD
50
mA
V
OHD
= 3.85V Min
V
OLP
Quiet Output
5.0
0.8
V
Maximum Dynamic V
OL
(Notes 4, 5)
V
OLV
Quiet Output
5.0
-0.8
V
Minimum Dynamic V
OL
(Notes 4, 5)
Note 2: All outputs loaded; thresholds associated with output under test.
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3
DC Electrical Characteristics for 'ACTQ Family Devices
(Continued)
Note 3: Maximum test duration 2.0 ms; one output loaded at a time.
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
Units
T
A
=
-55C to +125C
C
L
= 50 pF
Min
Max
t
PLH
Propagation Delay
2.5
10.0
t
PHL
A
n
, B
n
to B
n
, A
n
5.0
2.5
9.5
ns
t
PZH
Output Enable
5.0
2.5
9.5
ns
t
PZL
Time
2.5
10.5
t
PHZ
Output Disable
5.0
2.0
9.5
ns
t
PLZ
Time
2.0
9.5
Note 7: Voltage Range 5.0 is 5.0V
0.5V.
Capacitance
Symbol
Parameter
Typ
Units
Conditions
C
IN
Input Pin Capacitance
4.5
pF
V
CC
= 5.0V
C
PD
Power Dissipation
Capacitance
95
pF
V
CC
= 5.0V
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