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74HC148 bảng dữ liệu(PDF) 5 Page - STMicroelectronics

tên linh kiện 74HC148
Giải thích chi tiết về linh kiện  8 TO 3 LINE PRIORITY ENCODER
PDF  11 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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74HC148 bảng dữ liệu(HTML) 5 Page - STMicroelectronics

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AC ELECTRICAL CHARACTERISTICS (CL =50 pF, Input tr =tf =6 ns)
Symbol
Parameter
Test Conditions
Value
Unit
VCC
(V)
TA =25
oC
54HC and 74HC
-40 to 85
oC
74HC
-55 to 125
oC
54HC
Min.
Typ.
Max.
Min.
Max.
Min.
Max.
tTLH
tTHL
Output Transition
Time
2.0
30
75
95
110
ns
4.5
8
151922
6.0
7
131619
tPLH
tPHL
Propagation
Delay Time
(In - A0, A1, A2)
2.0
60
150
190
225
ns
4.5
19
30
38
45
6.0
16
26
32
38
tPLH
tPHL
Propagation
Delay Time
(In - EO, GS)
2.0
60
150
190
225
ns
4.5
19
30
38
45
6.0
16
26
32
38
tPLH
tPHL
Propagation
Delay Time
(EI - EO)
2.0
40
115
145
175
ns
4.5
14
23
29
35
6.0
12
20
25
30
tPLH
tPHL
Propagation
Delay Time
(EI - GS)
2.0
40
115
145
175
ns
4.5
14
23
29
35
6.0
12
20
25
30
tPLH
tPHL
Propagation
Delay Time
(EI - A0, A1, A2)
2.0
40
115
145
175
ns
4.5
14
23
29
35
6.0
12
20
25
30
CIN
Input Capacitance
5
10
10
10
pF
CPD (*)
Power Dissipation
Capacitance
60
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
INPUT WAVEFORM IS THE SAME AS THAT IN CASE OF
SWITCHING CHARACTERISTICS TEST.
SWITCHING CHARACTERISTICS TEST
CIRCUIT
TEST CIRCUIT ICC (Opr.)
M54/M74HC148
5/11



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