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74AC244M bảng dữ liệu(PDF) 4 Page - STMicroelectronics

tên linh kiện 74AC244M
Giải thích chi tiết về linh kiện  OCTAL BUS BUFFER WITH 3 STATE OUTPUTS NON INVERTED
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74AC244M bảng dữ liệu(HTML) 4 Page - STMicroelectronics

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CAPACITIVE CHARACTERISTICS
Symb ol
Parameter
Test Cond iti on s
Value
Un it
VCC
(V)
TA =25
oC
-40 to 85
oC
Min .
Typ.
Max.
Min.
Max.
CIN
Input Capacitance
5.0
4
pF
COUT
Output Capacitance
5.0
8
pF
CPD
Power Dissipation
Capacitance (note 1)
5.0
21
pF
1) 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 operating current can be obtained by the following equation. ICC(opr) = CPD
• VCC •fIN +ICC/n (per circuit)
AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, RL = 500
Ω, Input tr =tf =3 ns)
Symbol
Parameter
T est Cond iti on
Value
Unit
VCC
(V)
TA =25
oC-40 to 85 oC
Mi n.
Typ.
Max.
Min .
Max.
tPLH
tPHL
Propagation Delay Time
3.3
(*)
1.5
5
9
1.5
10
ns
5.0
(**)
1.5
4
7
1.5
7.5
tPZL
tPZH
Output Enable Time
3.3
(*)
1.5
6
10
1.5
11
ns
5.0
(**)
1.5
4
8
1.5
8.5
tPLZ
tPHZ
Output Disable Time
3.3
(*)
1.5
7
11
1.5
12
ns
5.0
(**)
1.5
5.5
9
1.5
10
(*) Voltage range is 3.3V
± 0.3V
(**) Voltage range is 5V
± 0.5V
TEST CIRCUIT
TEST
SWI TCH
tPLH,tPHL
Open
tPZL,tPLZ
2VCC
tPZH,tPHZ
Open
CL = 50 pF or equivalent (includes jig and probe capacitance)
RL =R1 = 500
Ω or equivalent
RT =ZOUT of pulse generator (typically 50
Ω)
74AC244
4/8



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