74HC148 查看數據表（PDF） - STMicroelectronics
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74HC148 Datasheet PDF : 11 Pages
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M54/M74HC148
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
(In - A0, A1, A2) 6.0
60 150
190
225
19 30
38
45
ns
16 26
32
38
tPLH Propagation
2.0
tPHL Delay Time
4.5
(In - EO, GS)
6.0
60 150
190
225
19 30
38
45
ns
16 26
32
38
tPLH Propagation
2.0
tPHL Delay Time
4.5
(EI - EO)
6.0
40 115
145
175
14 23
29
35
ns
12 20
25
30
tPLH Propagation
2.0
tPHL Delay Time
4.5
(EI - GS)
6.0
40 115
145
175
14 23
29
35
ns
12 20
25
30
tPLH Propagation
2.0
tPHL Delay Time
4.5
(EI - A0, A1, A2) 6.0
40 115
145
175
14 23
29
35
ns
12 20
25
30
CIN Input Capacitance
5
10
10
10 pF
CPD (*) Power Dissipation
60
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
SWITCHING CHARACTERISTICS TEST
CIRCUIT
TEST CIRCUIT ICC (Opr.)
INPUT WAVEFORM IS THE SAME AS THAT IN CASE OF
SWITCHING CHARACTERISTICS TEST.
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