74VHCT138A Просмотр технического описания (PDF) - STMicroelectronics
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74VHCT138A Datasheet PDF : 8 Pages
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74VHCT138A
AC ELECTRICAL CHARACTERISTICS (Input tr = tf =3 ns)
Symb ol
Parameter
tPLH Propagation Delay
tPHL Time A, B, C to Y
tPLH Propagation Delay
tPHL Time G1 to Y
tPLH Propagation Delay
tPHL Time G2A, G2B to Y
(*) Voltage range is 5V ± 0.5V
Test Condition
V CC
CL
( V)
(pF)
5.0(*)
15
5.0(*)
50
5.0(*)
15
5.0(*)
50
5.0(*)
15
5.0(*)
50
Value
TA = 25 oC
Min. Typ. Max.
7.6 10.4
8.1 11.4
6.6 9.1
7.1 10.1
7.0 9.6
7.5 10.6
-40 to 85 oC
Min . Max.
1.0 12.0
1.0 13.0
1.0 10.5
1.0 11.5
1.0 11.0
1.0 12.0
Unit
ns
ns
ns
CAPACITIVE CHARACTERISTICS
Symb ol
Parameter
Test Conditions
Value
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
TEST CIRCUIT
CL = 15/50 pF or equivalent (includes jig and probe capacitance)
RT = ZOUT of pulse generator (typically 50Ω)
4/8
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