National Products Inverter Welding System User Manual


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Absolute Maximum Ratings (Note)
If MilitaryAerospace specified devices are required
please contact the National Semiconductor Sales
OfficeDistributors for availability and specifications
Supply Voltage 7V
Input Voltage 7V
Operating Free Air Temperature Range
54LS
b
55
Cto
a
125
C
DM74LS 0
Cto
a
70
C
Storage Temperature Range
b
65
Cto
a
150
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
54LS14 DM74LS14
Units
Min Nom Max Min Nom Max
V
CC
Supply Voltage 45 5 55 475 5 525 V
V
T
a
Positive-Going Input
15 16 20 14 16 19 V
Threshold Voltage (Note 1)
V
T
b
Negative-Going Input
06 08 11 05 08 1 V
Threshold Voltage (Note 1)
HYS Input Hysteresis (Note 1) 04 08 04 08 V
I
OH
High Level Output Current
b
04
b
04 mA
I
OL
Low Level Output Current 4 8 mA
T
A
Free Air Operating Temperature
b
55 125 0 70
C
Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted)
Symbol Parameter Conditions Min
Typ
Max Units
(Note 2)
V
I
Input Clamp Voltage V
CC
e
Min I
I
eb
18 mA
b
15 V
V
OH
High Level Output V
CC
e
Min I
OH
e
Max 54LS 25 34
V
Voltage V
IL
e
Max
DM74 27 34
V
OL
Low Level Output V
CC
e
Min I
OL
e
Max 54LS 025 04
Voltage V
IH
e
Min
DM74 035 05 V
V
CC
e
Min I
OL
e
4 mA DM74 025 04
I
T
a
Input Current at V
CC
e
5V V
I
e
V
T
a
DM74
b
014 mA
Positive-Going Threshold
I
T
b
Input Current at V
CC
e
5V V
I
e
V
T
b
DM74
b
018 mA
Negative-Going Threshold
I
I
Input Current
Max V
CC
e
Max V
I
e
7V DM74
01 mA
Input Voltage
V
CC
e
Max V
I
e
100V 54LS
I
IH
High Level Input Current V
CC
e
Max V
I
e
27V 20 mA
I
IL
Low Level Input Current V
CC
e
Max V
I
e
04V
b
04 mA
I
OS
Short Circuit V
CC
e
Max 54LS
b
20
b
100
mA
Output Current (Note 3)
DM74
b
20
b
100
I
CCH
Supply Current with V
CC
e
Max
86 16 mA
Outputs High
I
CCL
Supply Current with V
CC
e
Max
12 21 mA
Outputs Low
Note 1 V
CC
e
5V
Note 2 All typicals are at V
CC
e
5V T
A
e
25
C
Note 3 Not more than one output should be shorted at a time and the duration should not exceed one second
2
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