M74HC251B1R(1993) 查看數據表（PDF） - STMicroelectronics
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M74HC251B1R Datasheet PDF : 11 Pages
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M54/M74HC251
AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, Input tr = tf = 6 ns)
Symbol
Parameter
Test Conditions
VCC
(V)
TA = 25 oC
54HC and 74HC
Value
-40 to 85 oC -55 to 125 oC Unit
74HC
54HC
Min. Typ. Max. Min. Max. Min. Max.
tTLH Output Transition 2.0
tTHL Time
4.5
30 75
8
15
95
110
19
22
ns
6.0
7
13
16
19
tPLH Propagation
2.0
tPHL Delay Time
4.5
(D - Y, W)
6.0
64 130
165
195
16 26
33
39
ns
14 22
28
33
tPLH Propagation
2.0
tPHL Delay Time
4.5
(A, B, C - Y, W) 6.0
80 160
200
240
20 32
40
48
ns
17 27
34
41
tPZL Output Enable
tPZH Time
2.0
4.5
RL = 1 KΩ
36 90
11 18
115
135
23
27
ns
6.0
9
15
20
23
tPLZ Output Disable
2.0
tPHZ Time
4.5
RL = 1 KΩ
26 85
13 17
105
130
21
26
ns
6.0
11 14
18
22
CIN Input Capacitance
5
10
10
10 pF
CPD (*) Power Dissipation
62
Capacitance
pF
(*) 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 operting current can be obtained by the following equation. ICC(opr) = CPD •VCC •fIN + ICC
TEST WAVEFORM ICC (Opr.)
* INPUT WAVEFORM TIME IS THE SAME AS THAT IN CASE OF SWITCHING CHARACTERISTICS TEST.
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