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DM74LS74AN

P1-P3P4-P6
© 2000 Fairchild Semiconductor Corporation DS006373 www.fairchildsemi.com
August 1986
Revised March 2000
DM74LS74A Dual Positive-Edge-Triggered D Flip-Flops with Preset, Clear and Complementary Outputs
DM74LS74A
Dual Positive-Edge-Triggered D Flip-Flops with
Preset, Clear and Complementary Outputs
General Description
This device contains two independent positive-edge-trig-
gered D flip-flops with complementary outputs. The infor-
mation 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
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
DM74LS74AM M14A 14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-120, 0.150 Narrow
DM74LS85ASJ M14D 14-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
DM74LS74AN N14A 14-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Inputs Outputs
PR CLR CLK D Q Q
LHXX H L
HLXX L H
L L X X H (Note 1) H (Note 1)
HH↑ HH L
HH↑ LL H
HHLX Q
0
Q
0
www.fairchildsemi.com 2
DM74LS74A
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: C
L
= 15 pF, R
L
= 2 kΩ, T
A
= 25°C, and V
CC
= 5V.
Note 4: C
L
= 50 pF, R
L
= 2 kΩ, T
A
= 25°C, and V
CC
= 5V.
Note 5: The symbol (↑) indicates the rising edge of the clock pulse is used for reference.
Note 6: T
A
= 25°C and V
CC
= 5V.
Supply Voltage 7V
Input Voltage 7V
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 8 mA
f
CLK
Clock Frequency (Note 3) 0 25 MHz
f
CLK
Clock Frequency (Note 4) 0 20 MHz
t
W
Pulse Width Clock HIGH 18
(Note 3) Preset LOW 15 ns
Clear LOW 15
t
W
Pulse Width Clock HIGH 25
(Note 4) Preset LOW 20 ns
Clear LOW 20
t
SU
Setup Time (Note 3)(Note 5) 20↑ ns
t
SU
Setup Time (Note 4)(Note 5) 25↑ ns
t
H
Hold Time (Note 5)(Note 6) 0↑ ns
T
A
Free Air Operating Temperature 0 70 °C
3 www.fairchildsemi.com
DM74LS74A
Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Note 7: All typicals are at V
CC
= 5V, T
A
= 25°C.
Note 8: Not more than one output should be shorted at a time, and the duration should not exceed one second. For devices, with feedback from the outputs,
where shorting the outputs to ground may cause the outputs to change logic state an equivalent test may be performed where V
O
= 2.125V with the minimum
and maximum limits reduced by one half from their stated values. This is very useful when using automatic test equipment.
Note 9: With all outputs OPEN, I
CC
is measured with CLOCK grounded after setting the Q and Q outputs HIGH in turn.
Switching Characteristics
at V
CC
= 5V and T
A
= 25°C
Symbol Parameter Conditions Min
Typ
Max Units
(Note 7)
V
I
Input Clamp Voltage V
CC
= Min, I
I
= −18 mA −1.5 V
V
OH
HIGH Level V
CC
= Min, I
OH
= Max
2.7 3.4 V
Output Voltage V
IL
= Max, V
IH
= Min
V
OL
LOW Level V
CC
= Min, I
OL
= Max
0.35 0.5
Output Voltage V
IL
= Max, V
IH
= Min V
I
OL
= 4 mA, V
CC
= Min 0.25 0.4
I
I
Input Current @ Max V
CC
= Max Data 0.1
Input Voltage V
I
= 7V Clock 0.1
mA
Preset 0.2
Clear 0.2
I
IH
HIGH Level V
CC
= Max Data 20
Input Current V
I
= 2.7V Clock 20
µA
Clear 40
Preset 40
I
IL
LOW Level V
CC
= Max Data −0.4
Input Current V
I
= 0.4V Clock −0.4
mA
Preset −0.8
Clear −0.8
I
OS
Short Circuit Output Current V
CC
= Max (Note 8) −20 −100 mA
I
CC
Supply Current V
CC
= Max (Note 9) 4 8 mA
From (Input)
R
L
= 2 kΩ
Symbol Parameter
To (Output)
C
L
= 15 pF C
L
= 50 pF Units
Min Max Min Max
f
MAX
Maximum Clock Frequency 25 20 MHz
t
PLH
Propagation Delay Time
Clock to Q or Q 25 35 ns
LOW-to-HIGH Level Output
t
PHL
Propagation Delay Time
Clock to Q or Q 30 35 ns
HIGH-to-LOW Level Output
t
PLH
Propagation Delay Time
Preset to Q 25 35 ns
LOW-to-HIGH Level Output
t
PHL
Propagation Delay Time
Preset to Q 30 35 ns
HIGH-to-LOW Level Output
t
PLH
Propagation Delay Time
Clear to Q 25 35 ns
LOW-to-HIGH Level Output
t
PHL
Propagation Delay Time
Clear to Q 30 35 ns
HIGH-to-LOW Level Output
P1-P3P4-P6

DM74LS74AN

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Manufacturer:
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Description:
Flip Flops Dl D-Type Flip-Flop
Lifecycle:
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