M74HC251 查看數據表（PDF） - STMicroelectronics
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M74HC251 Datasheet PDF : 11 Pages
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M74HC251
AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, Input tr = tf = 6ns)
Test Condition
Value
Symbol
Parameter
VCC
(V)
tTLH tTHL Output Transition 2.0
Time
4.5
6.0
tPLH tPHL Propagation Delay 2.0
Time
4.5
(D - Y, W)
6.0
tPHL Propagation Delay 2.0
Time
4.5
(A, B, C -Y, W)
6.0
tPZL tPZH High Impedance
2.0
Output Enable
4.5
Time
6.0
tPLZ tPHZ High Impedance
2.0
Output Disable
4.5
Time
6.0
RL = 1 KΩ
RL = 1 KΩ
TA = 25°C
-40 to 85°C -55 to 125°C Unit
Min. Typ. Max. Min. Max. Min. Max.
30 75
95
115
8 15
19
23 ns
7 13
16
20
64 130
165
195
16 26
33
39 ns
14 22
28
33
80 160
200
240
20 32
40
48 ns
17 27
34
41
36 90
115
135
11 18
23
27 ns
9 15
20
23
26 85
105
130
13 17
21
26 ns
11 14
18
22
CAPACITIVE CHARACTERISTICS
Test Condition
Value
Symbol
Parameter
VCC
(V)
TA = 25°C
-40 to 85°C -55 to 125°C Unit
Min. Typ. Max. Min. Max. Min. Max.
CIN Input Capacitance 5.0
5 10
10
10 pF
CPD Power Dissipation
Capacitance (note 5.0
62
pF
1)
1) CPD is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without
load. (Refer to Test Circuit). Average operating current can be obtained by the following equation. ICC(opr) = CPD x VCC x fIN + ICC
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