M74HC238 データシートの表示（PDF） - STMicroelectronics
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M74HC238 Datasheet PDF : 10 Pages
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M54/M74HC238
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
(A, B, C - Y)
6.0
50 150
190
225
17 30
38
45
ns
15 26
32
38
tPLH Propagation
2.0
tPHL Delay Time
4.5
(G1 - Y)
6.0
50 150
190
225
17 30
38
45
ns
15 26
32
38
tPLH Propagation
2.0
tPHL Delay Time
4.5
(G2 - Y)
6.0
50 150
190
225
17 30
38
45
ns
15 26
32
38
CIN
CPD (*)
Input Capacitance
Power Dissipation
Capacitance
5
10
10
10 pF
53
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
WAVEFORM
TEST CIRCUIT ICC (Opr.)
INPUT WAVEFORM IS THE SAME AS THAT IN CASE OF
SWITCHING CHARACTERISTICSTEST.
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