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SN74LS168 датащи(PDF) 4 Page - ON Semiconductor

номер детали SN74LS168
подробное описание детали  16 BINARY SYNCHRONOUS BI-DIRECTIONAL COUNTERS
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производитель  ONSEMI [ON Semiconductor]
домашняя страница  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

SN74LS168 датащи(HTML) 4 Page - ON Semiconductor

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SN74LS168
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4
MODE SELECT TABLE
PE
CEP
CET
U/D
Action on Rising Clock Edge
L
X
X
X
Load (Pn ³ Qn)
H
L
L
H
Count Up (increment)
H
L
L
L
Count Down (decrement)
H
H
X
X
No Change (Hold)
H
X
H
X
No Change (Hold)
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
AC CHARACTERISTICS (TA = 25°C, VCC = 5.0 V)
Symbol
Parameter
Limits
Unit
Test Conditions
Min
Typ
Max
fMAX
Maximum Clock Frequency
25
32
MHz
VCC = 5.0 V
CL = 15 pF
tPLH
tPHL
Propagation Delay,
Clock to TC
23
23
35
35
ns
tPLH
tPHL
Propagation Delay,
Clock to any Q
13
15
20
23
ns
tPLH
tPHL
Propagation Delay,
CET to TC
15
15
20
20
ns
tPLH
tPHL
Propagation Delay,
U/D to TC
17
19
25
29
ns
AC SETUP REQUIREMENTS (TA = 25°C)
Symbol
Parameter
Limits
Unit
Test Conditions
Min
Typ
Max
tW
Clock Pulse Width
25
ns
VCC = 5.0 V
ts
Setup Time,
Data or Enable
20
ns
ts
Setup Time
PE
25
ns
ts
Setup Time
U/D
30
ns
th
Hold Time
Any Input
0
ns


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