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74VHC238T Fiches technique(PDF) 4 Page - STMicroelectronics

No de pièce 74VHC238T
Description  3 TO 8 LINE DECODER
PDF  8 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

74VHC238T Fiches technique(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)
37
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
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, C to Y
3.3
(*)
15
8.0
12.3
1.0
14.5
ns
3.3
(*)
50
10.5
15.8
1.0
18.0
5.0
(**)
15
5.5
8.1
1.0
9.5
5.0
(**)
50
7.0
10.1
1.0
11.5
tPLH
tPHL
Propagation Delay
Time
G1 to Y
3.3
(*)
15
8.1
12.8
1.0
15.0
ns
3.3
(*)
50
10.6
16.3
1.0
18.5
5.0
(**)
15
5.4
8.1
1.0
9.5
5.0
(**)
50
6.9
10.1
1.0
11.5
tPLH
tPHL
Propagation Delay
Time
G2A, G2B to Y
3.3
(*)
15
8.1
12.3
1.0
14.5
ns
3.3
(*)
50
10.6
15.8
1.0
18.0
5.0
(**)
15
5.7
8.1
1.0
9.5
5.0
(**)
50
7.2
10.1
1.0
11.5
(*) 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)
RL =R1 =500
Ω orequivalent
RT =ZOUT of pulse generator (typically 50
Ω)
74VHC238
4/8



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