2000 Fairchild Semiconductor Corporation
DS006526
www.fairchildsemi.com
September 1986
Revised February 2000
DM7474 Dual
Posi
ti
ve-
E
d
ge-T
r
igger
ed D
-
T
ype Fli
p
-Fl
ops w
i
th
Pres
et,
Cl
ear and C
o
m
p
l
e
m
e
ntar
y
Out
puts
DM7474
Dual Positive-Edge-Triggered D-Type Flip-Flops with
Preset, Clear and Complementary Outputs
General Description
This device contains two independent positive-edge-trig-
gered D-type flip-flops with complementary outputs. The
information on the D input is accepted by the flip-flops on
the positive going edge of the clock pulse. The triggering
occurs at a voltage level and is not directly related to the
transition time of the rising edge of the clock. The data on
the D input may be changed while the clock is LOW or
HIGH without affecting the outputs as long as the data
setup and hold times are not violated. A LOW logic level on
the preset or clear inputs will set or reset the outputs
regardless of the logic levels of the other inputs.
Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter "X" to the ordering code.
Connection Diagram
Function Table
H
=
HIGH Logic Level
X
=
Either LOW or HIGH Logic Level
L
=
LOW Logic Level
=
Positive-going transition of the clock.
Q
0
=
The output logic level of Q before the indicated input conditions were
established.
Note 1: This configuration is nonstable; that is, it will not persist when either
the preset and/or clear inputs return to their inactive (HIGH) level.
Order Number
Package Number
Package Description
DM7474M
M14A
14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
DM7474N
N14A
14-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Inputs
Outputs
PR
CLR
CLK
D
Q
Q
L
H
X
X
H
L
H
L
X
X
L
H
L
L
X
X
H
(Note 1)
H
(Note 1)
H
H
H
H
L
H
H
L
L
H
H
H
L
X
Q
0
Q
0
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2
D
M
7474
Absolute Maximum Ratings
(Note 2)
Note 2: The "Absolute Maximum Ratings" are those values beyond which
the safety of the device cannot be guaranteed. The device should not be
operated at these limits. The parametric values defined in the Electrical
Characteristics tables are not guaranteed at the absolute maximum ratings.
The "Recommended Operating Conditions" table will define the conditions
for actual device operation.
Recommended Operating Conditions
Note 3: The symbol (
) indicates the rising edge of the clock pulse is used for reference.
Note 4: T
A
=
25
C and V
CC
=
5V.
Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Note 5: All typicals are at V
CC
=
5V, T
A
=
25
C.
Note 6: Not more than one output should be shorted at a time.
Note 7: With all outputs open, I
CC
is measured with the Q and Q outputs HIGH in turn. At the time of measurement the clock is grounded.
Note 8: Clear is tested with preset HIGH and preset is tested with clear HIGH.
Supply Voltage
7V
Input Voltage
5.5V
Operating Free Air Temperature Range
0
C to
+
70
C
Storage Temperature Range
-
65
C to
+
150
C
Symbol
Parameter
Min
Nom
Max
Units
V
CC
Supply Voltage
4.75
5
5.25
V
V
IH
HIGH Level Input Voltage
2
V
V
IL
LOW Level Input Voltage
0.8
V
I
OH
HIGH Level Output Current
-
0.4
mA
I
OL
LOW Level Output Current
16
mA
f
CLK
Clock Frequency (Note 4)
0
15
MHz
t
W
Pulse Width
Clock HIGH
30
(Note 4)
Clock LOW
37
ns
Clear LOW
30
Preset LOW
30
t
SU
Input Setup Time (Note 3)(Note 4)
20
ns
t
H
Input Hold Time (Note 3)(Note 4)
5
ns
T
A
Free Air Operating Temperature
0
70
C
Symbol
Parameter
Conditions
Min
Typ
Max
Units
(Note 5)
V
I
Input Clamp Voltage
V
CC
=
Min, I
I
=
-
12 mA
-
1.5
V
V
OH
HIGH Level
V
CC
=
Min, I
OH
=
Max
2.4
3.4
V
Output Voltage
V
IL
=
Max, V
IH
=
Min
V
OL
LOW
Level V
CC
=
Min, I
OL
=
Max
0.2
0.4
V
Output Voltage
V
IH
=
Min, V
IL
=
Max
I
I
Input Current @ Max Input Voltage
V
CC
=
Max, V
I
=
5.5V
1
mA
I
IH
HIGH Level
V
CC
=
Max
D
40
Input Current
V
I
=
2.4V
Clock
80
A
Clear
120
Preset
40
I
IL
LOW
Level V
CC
=
Max
D
-
1.6
Input Current
V
I
=
0.4V
Clock
-
3.2
mA
(Note 8)
Clear
-
3.2
Preset
-
1.6
I
OS
Short Circuit Output Current
V
CC
=
Max (Note 6)
-
18
-
55
mA
I
CC
Supply Current
V
CC
=
Max (Note 7)
17
30
mA
3
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DM7474
Switching Characteristics
at V
CC
=
5V and T
A
=
25
C
Symbol
Parameter
From (Input)
R
L
=
400
, C
L
=
15 pF
Units
To (Output)
Min
Max
f
MAX
Maximum Clock
15
MHz
Frequency
t
PHL
Propagation Delay Time
Preset to Q
40
ns
HIGH-to-LOW Level Output
t
PLH
Propagation Delay Time
Preset to Q
25
ns
LOW-to-HIGH Level Output
t
PHL
Propagation Delay Time
Clear to Q
40
ns
HIGH-to-LOW Level Output
t
PLH
Propagation Delay Time
Clear to Q
25
ns
LOW-to-HIGH Level Output
t
PHL
Propagation Delay Time
Clock to Q or Q
40
ns
HIGH-to-LOW Level Output
t
PLH
Propagation Delay Time
Clock to Q or Q
25
ns
LOW-to-HIGH Level Output
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4
D
M
7474
Physical Dimensions
inches (millimeters) unless otherwise noted
14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
Package Number M14A
5
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DM7474 Dual
Posi
ti
ve-
E
d
ge-T
r
igger
ed D
-
T
ype Fli
p
-Fl
ops w
i
th
Pres
et,
Cl
ear and C
o
m
p
l
e
m
e
ntar
y
Out
puts
Physical Dimensions
inches (millimeters) unless otherwise noted (Continued)
14-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Package Number N14A
Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and
Fairchild reserves the right at any time without notice to change said circuitry and specifications.
LIFE SUPPORT POLICY
FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD
SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the
body, or (b) support or sustain life, and (c) whose failure
to perform when properly used in accordance with
instructions for use provided in the labeling, can be rea-
sonably 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.
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