54ACTQ16245
16-Bit Transceiver with TRI-STATE
Outputs
General Description
The 'ACTQ16245 contains sixteen non-inverting bidirec-
tional buffers with TRI-STATE outputs and is intended for
bus oriented applications. The device is byte controlled.
Each has separate control inputs which can be shorted to-
gether for full 16-bit operation. The T/R inputs determine the
direction of data flow through the device. The OE inputs dis-
able both the A and B ports by placing them in a high imped-
ance state.
The 'ACTQ16245 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
Bidirectional non-inverting buffers
n
Separate control logic for each byte
n
16-bit version of the 'ACTQ245
n
Outputs source/sink 24 mA
n
Standard Microcircuit Drawing (SMD) 5962-9562001
Logic Symbol
Pin Description
Pin Names
Description
OE
n
Output Enable Input (Active Low)
T/R
Transmit/Receive Input
A
0
A
15
Side A Inputs/Outputs
B
0
B
15
Side B Outputs/Inputs
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.
DS010926-1
Pin Assignment for CERPAK
DS010926-2
September 1998
54ACTQ16245
16-Bit
T
ransceiver
with
TRI-ST
A
T
E
Outputs
1998 National Semiconductor Corporation
DS010926
www.national.com
Functional Description
The 'ACTQ16245 contains sixteen non-inverting bidirec-
tional buffers with TRI-STATE outputs. The device is byte
controlled with each byte functioning identically, but indepen-
dent of the other. The control pins can be shorted together to
obtain full 16-bit operation. The following description applies
to each byte. When the T/R input is HIGH, then Bus A data
is transmitted to Bus B. When the T/R input is LOW, Bus B
data is transmitted to Bus A. The TRI-STATE outputs are
controlled by an Output Enable (OE
n
) input for each byte.
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
T/R
1
L
L
Bus B
0
B
7
Data to Bus A
0
A
7
L
H
Bus A
0
A
7
Data to Bus B
0
B
7
H
X
HIGH-Z State on A
0
A
7
, B
0
B
7
Inputs
Outputs
OE
2
T/R
2
L
L
Bus B
8
B
15
Data to Bus A
8
A
15
L
H
Bus A
8
A
15
Data to Bus B
8
B
15
H
X
HIGH-Z State on A
8
A
15
, B
8
B
15
H = High Voltage Level
L = Low Voltage Level
X = Immaterial
Z = High Impedance
Logic Diagram
DS010926-3
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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 varaibles. 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
OL
= 24 mA
5.5
0.50
I
OL
= 24 mA
I
OZT
Maximum I/O
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 6)
I
OLD
Minimum Dynamic
5.5
50
mA
V
OLD
= 1.65V Max
I
OHD
Output Current (Note 3)
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.
Note 3: Maximum test duration 2.0 ms; one output loaded at a time.
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3
DC Electrical Characteristics for 'ACTQ Family Devices
(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: I
CC
for 54ACTQ
@
25C is identical to 74ACTQ
@
25C.
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
5.0
2.0
9.5
t
PHL
Delay A
n
, B
n
2.0
9.5
ns
to B
n
, A
n
t
PZH
,
Output Enable
5.0
2.5
11.0
ns
t
PZL
Time
2.5
13.0
t
PHZ
,
Output Disable
5.0
1.5
9.5
ns
t
PLZ
Time
1.5
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
95
pF
V
CC
= 5.0V
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