74LS168 National Semiconductor, 74LS168 Datasheet - Page 2

• Manufacturer Part Number: 74LS168
• Description: 54LS168 Synchronous Bi-Directional BCD Decade Counter
• Manufacturer: National Semiconductor

Absolute Maximum Ratings
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Supply Voltage
Input Voltage
Operating Free Air Temperature Range
Storage Temperature Range
Recommended Operating Conditions
54LS
V
V
V
I
I
T
t
t
t
t
t
t
t
t
t
t
t
t
t
t
Symbol
OH
OL
s
s
h
h
s
s
h
h
s
s
h
h
w
w
A
CC
IH
IL
(H)
(L)
(H)
(L)
(H)
(L)
(H)
(L)
(H)
(L)
(H)
(L)
(H)
(L)
Supply Voltage
High Level Input Voltage
Low Level Input Voltage
High Level Output Current
Low Level Output Current
Free Air Operating Temperature
Setup Time HIGH or LOW
P
Hold Time HIGH or LOW
P
Setup Time HIGH or LOW
PE to CP
Hold Time HIGH or LOW
PE to CP
Setup Time HIGH or LOW
U D to CP
Hold Time HIGH or LOW
U D to CP
CP Pulse Width HIGH or LOW
n
n
CEP or CET to CP
CEP or CET to CP
Parameter
b
b
55 C to
65 C to
(Note)
a
a
125 C
150 C
5 5V
7V
2
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
b
Note The ‘‘Absolute Maximum Ratings’’ are those values
Min
4 5
15
15
20
20
25
25
20
20
2
5
5
0
0
0
0
55
54LS168
Nom
5
b
Max
125
5 5
0 7
4
0 4
Units
mA
mA
ns
ns
ns
ns
ns
ns
ns
V
V
V
C