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DM74LS191N Datasheet(PDF) 2 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # DM74LS191N
Description  Synchronous 4-Bit Up/Down Counters with Mode Control
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

DM74LS191N 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
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
DM54LS190 LS191
DM74LS190 LS191
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 4)
0
20
0
20
MHz
tW
Pulse Width
Clock
25
25
ns
(Note 4)
Load
35
35
tSU
Data Setup Time (Note 4)
20
20
ns
tH
Data Hold Time (Note 4)
0
0
ns
tEN
Enable Time to Clock (Note 4)
30
30
ns
TA
Free Air Operating Temperature
b
55
125
0
70
C
’LS190 and ’LS191 Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
(Note 1)
VI
Input Clamp Voltage
VCC e Min II eb 18 mA
b
15
V
VOH
High Level Output
VCC e Min IOH e Max
DM54
25
34
Voltage
VIL e Max VIH e Min
DM74
27
34
V
VOL
Low Level Output
VCC e Min IOL e Max
DM54
025
04
Voltage
VIL e Max VIH e Min
DM74
035
05
V
IOL e 4 mA VCC e Min
DM74
025
04
II
Input Current
Max
VCC e Max
Enable
03
mA
Input Voltage
VI e 7V
Others
01
IIH
High Level Input
VCC e Max
Enable
60
m
A
Current
VI e 27V
Others
20
IIL
Low Level Input
VCC e Max
Enable
b
108
mA
Current
VI e 04V
Others
b
04
IOS
Short Circuit
VCC e Max
DM54
b
20
b
100
mA
Output Current
(Note 2)
DM74
b
20
b
100
ICC
Supply Current
VCC e Max (Note 3)
20
35
mA
Note 1
All typicals are at VCC e 5V TA e 25 C
Note 2
Not more than one output should be shorted at a time and the duration should not exceed one second
Note 3
ICC is measured with all inputs grounded and all outputs open
Note 4
TA e 25 C and VCC e 5V
2


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