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54LS74 Datasheet(PDF) 2 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. 54LS74
Description  Dual Positive-Edge-Triggered D Flip-Flops with Preset, Clear and Complementary Outputs
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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54LS74 Datasheet(HTML) 2 Page - National Semiconductor (TI)

   
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Absolute Maximum Ratings (Note)
If MilitaryAerospace specified devices are required
please contact the National Semiconductor Sales
OfficeDistributors for availability and specifications
Supply Voltage
7V
Input Voltage
7V
Operating Free Air Temperature Range
DM54LS and 54LS
b
55 Cto a125 C
DM74LS
0 Cto a70 C
Storage Temperature Range
b
65 Cto a150 C
Note
The ‘‘Absolute Maximum Ratings’’ are those values
beyond which the safety of the device cannot be guaran-
teed The device should not be operated at these limits The
parametric values defined in the ‘‘Electrical Characteristics’’
table are not guaranteed at the absolute maximum ratings
The ‘‘Recommended Operating Conditions’’ table will define
the conditions for actual device operation
Recommended Operating Conditions
Symbol
Parameter
DM54LS74A
DM74LS74A
Units
Min
Nom
Max
Min
Nom
Max
VCC
Supply Voltage
45
5
55
475
5
525
V
VIH
High Level Input Voltage
2
2
V
VIL
Low Level Input Voltage
07
08
V
IOH
High Level Output Current
b
04
b
04
mA
IOL
Low Level Output Current
4
8
mA
fCLK
Clock Frequency (Note 2)
0
25
0
25
MHz
fCLK
Clock Frequency (Note 3)
0
20
0
20
MHz
tW
Pulse Width
Clock High
18
18
(Note 2)
Preset Low
15
15
ns
Clear Low
15
15
tW
Pulse Width
Clock High
25
25
(Note 3)
Preset Low
20
20
ns
Clear Low
20
20
tSU
Setup Time (Notes 1 and 2)
20
u
20
u
ns
tSU
Setup Time (Notes 1 and 3)
25
u
25
u
ns
tH
Hold Time (Note 1 and 4)
0
u
0
u
ns
TA
Free Air Operating Temperature
b
55
125
0
70
C
Note 1
The symbol (
u) indicates the rising edge of the clock pulse is used for reference
Note 2
CL e 15 pF RL e 2kX TA e 25 C and VCC e 5V
Note 3
CL e 50 pF RL e 2kX TA e 25 C and VCC e 5V
Note 4
TA e 25 C and VCC e 5V
2


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