54ACQ245
54ACTQ245
Quiet Series Octal Bidirectional Transceiver with
TRI-STATE
Inputs/Outputs
General Description
The 'ACQ/'ACTQ245 contains eight non-inverting bidirec-
tional buffers with TRI-STATE outputs and is intended for
bus-oriented applications. Current sinking capability is
24 mA at both the A and B ports. The Transmit/Receive (T/R)
input determines the direction of data flow through the bidi-
rectional transceiver. Transmit (active-HIGH) enables data
from A ports to B ports; Receive (active-LOW) enables data
from B ports to A ports. The Output Enable input, when
HIGH, disables both A and B ports by placing them in a HIGH
Z condition.
The 'ACQ/'ACTQ utilizes NSC Quiet Series technology to
guarantee quiet output switching and improve dynamic
threshold performance. FACT Quiet Series
TM
features
GTO
TM
output control and undershoot corrector in addition to
a split ground bus for superior performance.
Features
n
I
CC
and I
OZ
reduced by 50%
n
Guaranteed simultaneous switching noise level and
dynamic threshold performance
n
Improved latch-up immunity
n
TRI-STATE outputs drive bus lines or buffer memory
address registers
n
Outputs source/sink 24 mA
n
Faster prop delays than the standard 'ACT245
n
4 kV minimum ESD immunity ('ACQ)
n
Standard Military Drawing (SMD)
-- 'ACTQ245: 5962-92187
-- 'ACQ245: 5962-92177
Logic Symbols
Pin
Description
Names
OE
Output Enable Input
T/R
Transmit/Receive Input
A
0
A
7
Side A TRI-STATE Inputs or TRI-STATE Outputs
B
0
B
7
Side B TRI-STATE Inputs or TRI-STATE Outputs
GTO
TM
is a trademark of National Semiconductor Corporation.
TRI-STATE
is a registered trademark of National Semiconductor Corporation.
FACT
is a registered trademark of Fairchild Semiconductor Corporation.
FACT Quiet Series
TM
is a trademark of Fairchild Semiconductor Corporation.
DS100237-1
IEEE/IEC
DS100237-2
September 1998
54ACQ245
54ACTQ245
Quiet
Series
Octal
Bidirectional
T
ransceiver
with
TRI-ST
A
T
E
Inputs/Outputs
1998 National Semiconductor Corporation
DS100237
www.national.com
Connection Diagrams
Truth Table
Inputs
Outputs
OE
T/R
L
L
Bus B Data to Bus A
L
H
Bus A Data to Bus B
H
X
HIGH-Z State
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Pin Assignment for
DIP and Flatpak
DS100237-3
Pin Assignment
for LCC
DS100237-4
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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 Input Voltage (V
I
)
-0.5V to V
CC
+ 0.5V
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
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
)
-65C to +150C
DC Latch-Up Source or
Sink Current
300 mA
Junction Temperature (T
J
)
CDIP
175C
Recommended Operating
Conditions
Supply Voltage (V
CC
)
'ACQ
2.0V to 6.0V
'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
)
54ACQ/ACTQ
-55C to +125C
Minimum Input Edge Rate
V/
t
'ACQ Devices
V
IN
from 30% to 70% of V
CC
V
CC
@
3.0V, 4.5V, 5.5V
125 mV/ ns
Minimum Input Edge Rate
V/
t
'ACTQ Devices
V
IN
from 0.8V to 2.0V
V
CC
@
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 'ACQ Family Devices
54ACQ
Symbol
Parameter
V
CC
T
A
=
Units
Conditions
(V)
-55C to +125C
Guaranteed Limits
V
IH
Minimum High
3.0
2.1
V
OUT
= 0.1V
Level Input
4.5
3.15
V
or V
CC
- 0.1V
Voltage
5.5
3.85
V
IL
Maximum Low
3.0
0.9
V
OUT
= 0.1V
Level Input
4.5
1.35
V
or V
CC
- 0.1V
Voltage
5.5
1.65
V
OH
Minimum High
3.0
2.9
I
OUT
= -50 A
Level Output
4.5
4.4
V
Voltage
5.5
5.4
(Note 2)
V
IN
= V
IL
or V
IH
3.0
2.4
-12 mA
4.5
3.7
V
I
OH
-24 mA
5.5
4.7
-24 mA
V
OL
Maximum Low
3.0
0.1
I
OUT
= 50 A
Level Output
4.5
0.1
V
Voltage
5.5
0.1
(Note 2)
V
IN
= V
IL
or V
IH
3.0
0.50
12 mA
4.5
0.50
V
I
OL
24 mA
5.5
0.50
24 mA
I
IN
Maximum Input
5.5
1.0
A
V
I
= V
CC
, GND
Leakage Current
(Note 4)
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3
DC Characteristics for 'ACQ Family Devices
(Continued)
54ACQ
Symbol
Parameter
V
CC
T
A
=
Units
Conditions
(V)
-55C to +125C
Guaranteed Limits
I
OLD
(Note 3) Minimum
Dynamic Output
Current
5.5
50
mA
V
OLD
= 1.65V Max
I
OHD
5.5
-50
mA
V
OHD
= 3.85V Min
I
CC
Maximum Quiescent
5.5
80.0
A
V
IN
= V
CC
Supply Current
or GND (Note 4)
I
OZT
Maximum I/O
V
I
(OE) = V
IL
, V
IH
Leakage Current
5.5
5.5
A
V
I
= V
CC
, GND
V
O
= V
CC
, GND
V
OLP
Quiet Output
5.0
1.5
V
Maximum Dynamic
V
OL
(Note 5)
V
OLV
Quiet Output
5.0
-1.2
V
Minimum Dynamic
V
OL
(Note 5)
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
.
Note 5: Max number of outputs defined as (n). Data Inputs are driven 0V to 5V; one output
@
GND.
DC Characteristics for 'ACTQ Family Devices
54ACTQ
Symbol
Parameter
V
CC
T
A
=
Units
Conditions
(V)
-55C to +125C
Guaranteed Limits
V
IH
Minimum High Level
4.5
2.0
V
V
OUT
= 0.1V
Input Voltage
5.5
2.0
or V
CC
- 0.1V
V
IL
Maximum Low Level
4.5
0.8
V
V
OUT
= 0.1V
Input Voltage
5.5
0.8
or V
CC
- 0.1V
V
OH
Minimum High Level
4.5
4.4
V
I
OUT
= -50 A
Output Voltage
5.5
5.4
(Note 6)
V
IN
= V
IL
or V
IH
4.5
3.70
V
I
OH
-24 mA
5.5
4.70
-24 mA
V
OL
Maximum Low Level
4.5
0.1
V
I
OUT
= 50 A
Output Voltage
5.5
0.1
(Note 6)
V
IN
= V
IL
or V
IH
4.5
0.50
V
I
OL
24 mA
5.5
0.50
24 mA
I
IN
Maximum Input
5.5
1.0
A
V
I
= V
CC
, GND
Leakage Current
I
OZT
Maximum TRI-STATE
5.5
5.0
A
V
I
= V
IL
, V
IH
Leakage Current
V
O
= V
CC
, GND
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4
DC Characteristics for 'ACTQ Family Devices
(Continued)
54ACTQ
Symbol
Parameter
V
CC
T
A
=
Units
Conditions
(V)
-55C to +125C
Guaranteed Limits
I
CCT
Maximum
5.5
1.6
mA
V
I
= V
CC
- 2.1V
I
CC
/Input
I
OLD
(Note 7) Minimum
Dynamic Output
Current
5.5
50
mA
V
OLD
= 1.65V Max
I
OHD
5.5
-50
mA
V
OHD
= 3.85V Min
I
CC
Maximum Quiescent
5.5
80.0
A
V
IN
= V
CC
Supply Current
or GND
V
OLP
Quiet Output
5.0
1.65
V
Maximum Dynamic
V
OL
(Note 8)
V
OLV
Quiet Output
5.0
-1.2
V
Minimum Dynamic
V
OL
(Note 8)
Note 6: All outputs loaded; thresholds on input associated with output under test.
Note 7: Maximum test duration 2.0 ms, one output loaded at a time.
Note 8: Max number of outputs defined as (n). n-1 Data Inputs are driven 0V to 3V; one output
@
GND.
AC Electrical Characteristics for 'ACQ Devices
54ACQ
V
CC
T
A
= -55C
Fig.
Symbol
Parameter
(V)
to +125C
Units
No.
(Note 9)
C
L
= 50 pF
Min
Max
t
PHL
, t
PLH
Propagation Delay
3.0
1.5
11.5
ns
Data to Output
4.5
1.5
10.0
t
PZL
, t
PZH
Output Enable Time
3.0
1.5
13.0
ns
4.5
1.5
10.0
t
PHZ
, t
PLZ
Output Disable Time
3.0
1.5
13.0
ns
4.5
1.5
10.0
Note 9: Voltage Range 5.0 is 5.0V
0.5V
Voltage Range 3.3 is 3.3V
0.3V
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5
AC Electrical Characteristics for 'ACTQ Devices
54ACTQ
V
CC
T
A
= -55C
Fig.
Symbol
Parameter
(V)
to +125C
Units
No.
(Note 10)
C
L
= 50 pF
Min
Max
t
PHL
, t
PLH
Propagation Delay
5.0
1.5
9.0
ns
Data to Output
t
PZL
, t
PZH
Output Enable Time
5.0
1.5
12.0
ns
t
PHZ
, t
PLZ
Output Disable Time
5.0
1.5
11.5
ns
Note 10: Voltage Range 5.0 is 5.0V
0.5V
Capacitance
Symbol
Parameter
Typ
Units
Conditions
C
IN
Input Capacitance
4.5
pF
V
CC
= OPEN
C
I/O
Input/Output
15
pF
V
CC
= 5.0V
Capacitance
C
PD
Power Dissipation
80.0
pF
V
CC
= 5.0V
Capacitance
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6
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
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7
Physical Dimensions
inches (millimeters) unless otherwise noted (Continued)
LIFE SUPPORT POLICY
NATIONAL'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DE-
VICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMI-
CONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or sys-
tems which, (a) are intended for surgical implant into
the body, or (b) support or sustain life, and whose fail-
ure to perform when properly used in accordance
with instructions for use provided in the labeling, can
be reasonably expected to result in a significant injury
to the user.
2. A critical component in any component of a life support
device or system whose failure to perform can be rea-
sonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
National Semiconductor
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20-Lead Ceramic Flatpak (F)
NS Package Number W20A
54ACQ245
54ACTQ245
Quiet
Series
Octal
Bidirectional
T
ransceiver
with
TRI-ST
A
T
E
Inputs/Outputs
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.
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