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74VHC139T Arkusz danych(PDF) 4 Page - STMicroelectronics

Numer części 74VHC139T
Szczegółowy opis  DUAL 2 TO 4 DECODER/DEMULTIPLEXER
PDF  8 Pages
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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

74VHC139T Arkusz danych(HTML) 4 Page - STMicroelectronics

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CAPACITIVE CHARACTERISTICS
Symb ol
Parameter
T est Cond ition s
Val ue
Un it
TA =25
oC
-40 to 85
oC
Min.
Typ .
Max.
Min .
Max.
CIN
Input Capacitance
4
10
10
pF
CPD
Power Dissipation
Capacitance (note 1)
26
pF
1) CPD isdefined as the value of the IC’sinternal equivalent capacitance which is calculated fromthe operating current consumption without load. (Referto
Test Circuit).Average operating current can be obtained by the following equation. ICC(opr) = CPD
• VCC • fIN +ICC/2 (per Decoder)
AC ELECTRICAL CHARACTERISTICS (Input tr =tf =3 ns)
Symb ol
Parameter
Test Co nditi on
Val ue
Un it
VCC
(V)
CL
(pF )
TA =25
oC
-40 to 85
oC
Min.
Typ .
Max.
Min .
Max.
tPLH
tPHL
Propagation Delay
Time
A, B, to Y
3.3
(*)
15
7.2
11.0
1.0
13.0
ns
3.3
(*)
50
9.7
14.5
1.0
16.5
5.0
(**)
15
5.0
7.2
1.0
8.5
5.0
(**)
50
6.5
9.2
1.0
10.5
tPLH
tPHL
Propagation Delay
Time
Gto Y
3.3
(*)
15
6.4
9.2
1.0
11.0
ns
3.3
(*)
50
8.9
12.7
1.0
14.5
5.0
(**)
15
4.4
6.3
1.0
7.5
5.0
(**)
50
5.9
8.3
1.0
9.5
(*) Voltage range is 3.3V
± 0.3V
(**) Voltage range is 5V
± 0.5V
TEST CIRCUIT
CL = 15/50 pF or equivalent (includes jig and probe capacitance)
RT =ZOUT of pulse generator (typically 50
Ω)
74VHC139
4/8



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