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DM74LS191 Datasheet(PDF) 4 Page - Fairchild Semiconductor

Part No. DM74LS191
Description  Synchronous 4-Bit Up/Down Counter with Mode Control
Download  6 Pages
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Maker  FAIRCHILD [Fairchild Semiconductor]
Homepage  http://www.fairchildsemi.com
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DM74LS191 Datasheet(HTML) 4 Page - Fairchild Semiconductor

   
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4
Absolute Maximum Ratings(Note 1)
Note 1: 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 2: TA = 25°C and VCC = 5V.
DC Electrical Characteristics
Note 3: All typicals are at VCC = 5V, TA = 25°C.
Note 4: Not more than one output should be shorted at a time, and the duration should not exceed one second.
Note 5: ICC is measured with all inputs grounded and all outputs open.
Storage Temperature Range
−65°C to +150°C
Input Voltage
7V
Operating Free Air Temp. Range
0
°C to +70°C
Supply Voltage
7V
Symbol
Parameter
Min
Nom
Max
Units
VCC
Supply Voltage
4.75
5
5.25
V
VIH
HIGH Level Input Voltage
2
V
VIL
LOW Level Input Voltage
0.8
V
IOH
HIGH Level Output Current
−0.4
mA
IOL
LOW Level Output Current
8
mA
fCLK
Clock Frequency (Note 2)
0
20
MHz
tW
Pulse Width
Clock
25
ns
(Note 2)
Load
35
tSU
Data Setup Time (Note 2)
20
ns
tH
Data Hold Time (Note 2)
0
ns
tEN
Enable Time to Clock (Note 2)
30
ns
TA
Free Air Operating Temperature
0
70
°C
Symbol
Parameter
Conditions
Min
Typ
Max
Units
(Note 3)
VI
Input Clamp Voltage
VCC = Min, II = − 18 mA
−1.5
V
VOH
HIGH Level Output
VCC = Min, IOH = Max
Mil
2.5
3.4
Voltage
VIL = Max, VIH = Min
Com
2.7
3.4
V
VOL
LOW Level Output
VCC = Min, IOL = Max
0.25
0.4
Voltage
VIL = Max, VIH = Min
0.35
0.5
V
IOL = 4 mA, VCC = Min
0.25
0.4
II
Input Current @ Max
VCC = Max
Enable
0.3
mA
Input Voltage
VI = 7V
Others
0.1
IIH
HIGH Level Input
VCC = Max
Enable
60
µA
Current
VI = 2.7V
Others
20
IIL
LOW Level Input
VCC = Max
Enable
−1.08
mA
Current
VI = 0.4V
Others
−0.4
IOS
Short Circuit
VCC = Max
Mil
−20
−100
mA
Output Current
(Note 4)
Com
−20
−100
ICC
Supply Current
VCC = Max (Note 5)
20
35
mA


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