參數(shù)資料
型號: 74VHC238T
廠商: 意法半導(dǎo)體
英文描述: 3 TO 8 LINE DECODER
中文描述: 3至8線譯碼器
文件頁數(shù): 4/8頁
文件大小: 64K
代理商: 74VHC238T
CAPACITIVE CHARACTERISTICS
Symbol
Parameter
Test Conditions
Value
Unit
T
A
= 25
o
C
Min.
Typ.
-40 to 85
o
C
Min.
Max.
10
Max.
10
C
IN
C
PD
Input Capacitance
Power Dissipation
Capacitance (note 1)
4
pF
pF
37
1)C
PD
isdefined as thevalue oftheIC’sinternal equivalent capacitance whichiscalculated fromtheoperatingcurrent consumption without load.(Referto
TestCircuit).Average operatingcurrent canbeobtained bythefollowingequation.I
CC
(opr)=C
PD
V
CC
f
IN
+I
CC
AC ELECTRICAL CHARACTERISTICS
(Inputt
r
= t
f
=3 ns)
Symbol
Parameter
Test Condition
C
L
(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
Unit
V
CC
(V)
T
A
= 25
o
C
Min.
Typ.
-40 to 85
o
C
Min.
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
Max.
12.3
15.8
8.1
10.1
12.8
16.3
8.1
10.1
12.3
15.8
8.1
10.1
Max.
14.5
18.0
9.5
11.5
15.0
18.5
9.5
11.5
14.5
18.0
9.5
11.5
t
PLH
t
PHL
Propagation Delay
Time
A, B, C to Y
8.0
10.5
5.5
7.0
8.1
10.6
5.4
6.9
8.1
10.6
5.7
7.2
ns
t
PLH
t
PHL
Propagation Delay
Time
G1 to Y
ns
t
PLH
t
PHL
Propagation Delay
Time
G2A, G2B to Y
ns
(*) Voltagerangeis3.3V
±
0.3V
(**) Voltagerange is 5V
±
0.5V
TESTCIRCUIT
C
L
=15/50pForequvalent (includes jigand probecapacitance)
R
L
=R
1
=500
orequivalent
R
T
=Z
OUT
ofpulsegenerator (typically50
)
74VHC238
4/8
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