54AC74/54ACT74 Dual D-Type Positive Edge-Triggered Flip-Flop
July 2003
54AC74/54ACT74
Dual D-Type Positive Edge-Triggered Flip-Flop
General Description
The ’AC/’ACT74 is a dual D-type flip-flop with Asynchronous
Clear and Set inputs and complementary (Q, Q) outputs.
Information at the input is transferred to the outputs on the
positive edge of the clock pulse. Clock triggering occurs at a
voltage level of the clock pulse and is not directly related to
the transition time of the positive-going pulse. After the Clock
Pulse input threshold voltage has been passed, the Data
input is locked out and information present will not be trans-
ferred to the outputs until the next rising edge of the Clock
Pulse input.
Asynchronous Inputs:
LOW input to S
D
(Set) sets Q to HIGH level
LOW input to C
D
(Clear) sets Q to LOW level
Clear and Set are independent of clock
Simultaneous LOW on C
D
and S
D
makes both Q and Q
HIGH
Features
I
CC
reduced by 50%
Output source/sink 24 mA
’ACT74 has TTL-compatible inputs
Standard Microcircuit Drawing (SMD)
— ’AC74: 5962-88520
— ’ACT74: 5962-87525
n
54AC74 now qualified to 300Krad RHA designation,
refer to the SMD for more information
n
n
n
n
Logic Symbols
10026601
10026602
IEEE/IEC
D
1
, D
2
Pin Names
CP
1
, CP
2
C
D1
, C
D2
S
D1
, S
D2
Q
1
, Q
1
, Q
2
, Q
2
Description
Data Inputs
Clock Pulse Inputs
Direct Clear Inputs
Direct Set Inputs
Outputs
10026603
FACT
®
is a registered trademark of Fairchild Semiconductor Corporation.
© 2003 National Semiconductor Corporation
DS100266
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54AC74/54ACT74
Connection Diagrams
Pin Assignment for DIP
and Flatpak
Pin Assignment for LCC
10026604
10026605
Truth Table
(Each Half)
Inputs
S
D
L
H
L
H
H
H
C
D
H
L
L
H
H
H
CP
X
X
X
N
N
Outputs
D
X
X
X
H
L
X
Q
H
L
H
H
L
Q
0
Q
L
H
H
L
H
Q
0
L
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
N
= LOW-to-HIGH Clock Transition
Q
0
(Q
0
) = Previous Q(Q) before LOW-to-HIGH Transition of Clock
Logic Diagram
10026606
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
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2
54AC74/54ACT74
Absolute Maximum Ratings
(Note 1)
’ACT
Input Voltage (V
I
)
Output Voltage (V
O
)
Operating Temperature (T
A
)
54AC/ACT
Minimum Input Edge Rate (∆V/∆t)
’AC Devices
V
IN
from 30% to 70% of V
CC
V
CC
@
3.3V, 4.5V, 5.5V
Minimum Input Edge Rate (∆V/∆t)
’ACT 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
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 Input Voltage (V
I
)
DC Output Diode Current (I
OK
)
V
O
= −0.5V
V
O
= V
CC
+ 0.5V
DC Output Voltage (V
O
)
DC Output Source
or Sink Current (I
O
)
DC V
CC
or Ground Current
per Output Pin (I
CC
or I
GND
)
Storage Temperature (T
STG
)
Junction Temperature (T
J
)
CDIP
175˚C
−20 mA
+20 mA
−0.5V to V
CC
+ 0.5V
−20 mA
+20 mA
−0.5V to V
CC
+ 0.5V
−0.5V to +7.0V
125 mV/ns
125 mV/ns
±
50 mA
±
50 mA
−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.
Recommended Operating
Conditions
Supply Voltage (V
CC
)
’AC
2.0V to 6.0V
DC Characteristics for ’AC Family Devices
54AC
Symbol
Parameter
V
CC
(V)
T
A
=
−55˚C to +125˚C
Guaranteed
Limits
V
IH
Minimum High
Level Input
Voltage
V
IL
Maximum Low
Level Input
Voltage
V
OH
Minimum High
Level Output
Voltage
3.0
4.5
5.5
3.0
4.5
5.5
3.0
4.5
5.5
2.1
3.15
3.85
0.9
1.35
1.65
2.9
4.4
5.4
(Note 2)
V
IN
= V
IL
or V
IH
3.0
4.5
5.5
V
OL
Maximum Low
Level Output
Voltage
3.0
4.5
5.5
2.4
3.7
4.7
0.1
0.1
0.1
(Note 2)
V
IN
= V
IL
or V
IH
V
V
I
OH
−12 mA
−24 mA
−24 mA
I
OUT
= 50 µA
V
I
OUT
= −50 µA
V
V
OUT
= 0.1V
or V
CC
− 0.1V
V
V
OUT
= 0.1V
or V
CC
− 0.1V
Units
Conditions
3
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54AC74/54ACT74
DC Characteristics for ’AC Family Devices
Symbol
Parameter
V
CC
(V)
(Continued)
54AC
T
A
=
−55˚C to +125˚C
Guaranteed
Limits
3.0
4.5
5.5
I
IN
I
OLD
I
OHD
I
CC
Maximum Input
Leakage Current
(Note 3) Minimum
Dynamic Output
Current
Maximum Quiescent
Supply Current
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.
Units
Conditions
0.5
0.5
0.5
V
µA
mA
mA
µA
I
OL
12 mA
24 mA
24 mA
V
I
= V
CC
, GND
V
OLD
= 1.65V Max
V
OHD
= 3.85V Min
V
IN
= V
CC
or GND
5.5
5.5
5.5
5.5
±
1.0
50
−50
40.0
DC Characteristics for ’ACT Family Devices
54ACT
Symbol
Parameter
V
CC
(V)
T
A
=
−55˚C to +125˚C
Guaranteed
Limits
V
IH
Minimum High
Level Input
Voltage
Maximum Low
Level Input
Voltage
Minimum High
Level Output
Voltage
4.5
5.5
4.5
5.5
4.5
5.5
2.0
2.0
0.8
0.8
4.4
5.4
(Note 5)
V
IN
= V
IL
or V
IH
4.5
5.5
V
OL
Maximum Low
Level Output
Voltage
4.5
5.5
3.70
4.70
0.1
0.1
(Note 5)
V
IN
= V
IL
or V
IH
4.5
5.5
I
IN
I
CCT
I
OLD
I
OHD
Maximum Input
Leakage Current
Maximum
I
CC
/Input
(Note 6) Minimum
Dynamic Output
Current
5.5
5.5
50
−50
mA
mA
V
OLD
= 1.65V Max
V
OHD
= 3.85V Min
5.5
1.6
mA
V
I
= V
CC
− 2.1V
5.5
0.50
0.50
V
µA
I
OL
24 mA
24 mA
V
I
= V
CC
, GND
V
V
I
OH
−24 mA
−24 mA
I
OUT
= 50 µA
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
Units
Conditions
V
IL
V
OH
±
1.0
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4
54AC74/54ACT74
DC Characteristics for ’ACT Family Devices
Symbol
Parameter
V
CC
(V)
T
A
=
(Continued)
54ACT
Units
Conditions
−55˚C to +125˚C
Guaranteed
Limits
I
CC
Maximum Quiescent
Supply Current
Note 5:
All outputs loaded; thresholds on input associated with output under test.
Note 6:
Maximum test duration 2.0 ms, one output loaded at a time.
Note 7:
I
CC
for 54ACT
@
25˚C is identical to 74ACT
@
25˚C.
5.5
40.0
µA
V
IN
= V
CC
or GND
AC Electrical Characteristics
V
CC
Symbol
Parameter
(V)
(Note 8)
Min
f
max
t
PLH
t
PHL
t
PLH
t
PHL
Maximum Clock
Frequency
Propagation Delay
C
Dn
or S
Dn
to Q
n
or Q
n
Propagation Delay
C
Dn
or S
Dn
to Q
n
or Q
n
Propagation Delay
CP
n
to Q
n
or Q
n
Propagation Delay
CP
n
to Q
n
or Q
n
Note 8:
Voltage Range 3.3 is 3.3V
±
0.3V
Voltage Range 5.0 is 5.0V
±
0.5V
54AC
T
A
= −55˚C to +125˚C
C
L
= 50 pF
Max
MHz
13.0
9.5
14.0
10.5
17.5
12.0
13.5
10.0
ns
ns
ns
ns
70
95
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
Units
Fig.
No.
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
AC Operating Requirements
54AC
Symbol
Parameter
V
CC
(V)
(Note 9)
t
s
t
h
t
w
t
rec
Set-up Time, HIGH or LOW
D
n
to CP
n
Hold Time, HIGH or LOW
D
n
to CP
n
CP
n
or C
Dn
or S
Dn
Pulse Width
Recovery Time
C
Dn
or S
Dn
to CP
Note 9:
Voltage Range 3.3 is 3.3V
±
0.3V
Voltage Range 5.0 is 5.0V
±
0.5V
T
A
= −55˚C to +125˚C
C
L
= 50 pF
Guaranteed Limits
5.0
4.0
0.5
0.5
8.0
5.5
0.5
0.5
Units
Fig.
No.
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
ns
ns
ns
ns
5
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