74VHC157T データシートの表示（PDF） - STMicroelectronics
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74VHC157T Datasheet PDF : 9 Pages
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74VHC157
AC ELECTRICAL CHARACTERISTICS (Input tr = tf =3 ns)
Symb ol
Parameter
tPLH Propagation Delay
tPHL Time
A, B to Y
tPLH Propagation Delay
tPHL Time
SELECT to Y
tPLH Propagation Delay
tPHL Time
STROBE to Y
(*) Voltage range is 3.3V ± 0.3V
(**) Voltage range is 5V ± 0.5V
Test Condition
V CC
CL
( V)
(pF)
3.3(*)
15
3.3(*)
50
5.0(**)
15
5.0(**)
50
3.3(*)
15
3.3(*)
50
5.0(**)
15
5.0(**)
50
3.3(*)
15
3.3(*)
50
5.0(**)
15
5.0(**)
50
Value
TA = 25 oC
Min. Typ. Max.
6.2 9.7
8.7 13.2
4.1 6.4
5.6 8.4
8.4 13.2
10.9 16.7
5.3 8.1
6.8 10.1
8.7 13.6
11.2 17.1
5.6 8.6
7.1 10.6
-40 to 85 oC
Min . Max.
1.0 11.5
1.0 15.0
1.0 7.5
1.0 9.5
1.0 15.5
1.0 19.0
1.0 9.5
1.0 11.5
1.0 16.0
1.0 19.5
1.0 10.0
1.0 12.0
Unit
ns
ns
ns
CAPACITIVE CHARACTERISTICS
Symb ol
Parameter
Test Conditions
Value
TA = 25 oC
Min. Typ. Max.
-40 to 85 oC
Min . Max.
Un it
CIN Input Capacitance
4
10
10
pF
CPD Power Dissipation
Capacitance (note 1)
20
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/4 (per Channel)
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