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74VHCT138A Datasheet(PDF) 4 Page - STMicroelectronics

Part No. 74VHCT138A
Description  3 TO 8 LINE DECODER INVERTING
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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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)
49
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
5.0
(*)
15
7.6
10.4
1.0
12.0
ns
5.0
(*)
50
8.1
11.4
1.0
13.0
tPLH
tPHL
Propagation Delay
Time G1 to Y
5.0
(*)
15
6.6
9.1
1.0
10.5
ns
5.0
(*)
50
7.1
10.1
1.0
11.5
tPLH
tPHL
Propagation Delay
Time G2A, G2B to Y
5.0
(*)
15
7.0
9.6
1.0
11.0
ns
5.0
(*)
50
7.5
10.6
1.0
12.0
(*) 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)
74VHCT138A
4/8




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