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54HC244 bảng dữ liệu(PDF) 6 Page - STMicroelectronics

tên linh kiện 54HC244
Giải thích chi tiết về linh kiện  HC240: INVERTED - HC241/244 NON INVERTED OCTAL BUS BUFFER WITH 3 STATE OUTPUTS
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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54HC244 bảng dữ liệu(HTML) 6 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)
CL
(pF)
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
50
25
60
75
90
ns
4.5
7
121918
6.0
6
101315
tPLH
tPHL
Propagation
Delay Time
2.0
50
36
90
115
135
ns
4.5
12
18
23
27
6.0
10
15
20
23
2.0
150
51
130
165
195
ns
4.5
17
26
33
39
6.0
14
22
28
33
tPZL
tPZH
Output Enable
Time
2.0
50
RL =1K
Ω
48
125
155
190
ns
4.5
16
25
31
38
6.0
14
21
26
32
2.0
150
RL =1K
Ω
63
165
205
250
ns
4.5
21
33
41
50
6.0
18
28
35
43
tPLZ
tPHZ
Output Disable
Time
2.0
50
RL =1K
Ω
32
125
155
190
ns
4.5
15
25
31
38
6.0
14
21
26
32
CIN
Input Capacitance
5
10
10
10
pF
COUT
Output
Capacitance
10
pF
CPD (*)
Power Dissipation
Capacitance
HC240
HC241/244
31
33
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/8 (per circuit)
TEST CIRCUIT ICC (Opr.)
HC240
M54/M74HC240/241/244
6/12



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