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參數(shù)資料
| 型號： | M74HC148TTR |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 8 TO 3 LINE PRIORITY ENCODER |
| 中文描述： | 8:3線優(yōu)先編碼器 |
| 文件頁數(shù)： | 5/11頁 |
| 文件大?。?/td> | 252K |
| 代理商： | M74HC148TTR |
AC ELECTRICAL CHARACTERISTICS
(C
L
= 50 pF, Input t
r
= t
f
= 6 ns)
Symbol
Parameter
Test Conditions
Value
-40 to 85
o
C
74HC
Min.
Unit
V
CC
(V)
T
A
= 25
o
C
54HC and 74HC
Min.
Typ.
30
-55 to 125
o
C
54HC
Min.
Max.
75
15
13
150
30
26
150
30
26
115
23
20
115
23
20
115
23
20
10
Max.
95
19
16
190
38
32
190
38
32
145
29
25
145
29
25
145
29
25
10
Max.
110
22
19
225
45
38
225
45
38
175
35
30
175
35
30
175
35
30
10
t
TLH
t
THL
Output Transition
Time
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
ns
8
7
t
PLH
t
PHL
Propagation
Delay Time
(In - A0, A1, A2)
60
19
16
60
19
16
40
14
12
40
14
12
40
14
12
5
60
ns
t
PLH
t
PHL
Propagation
Delay Time
(In - EO, GS)
ns
t
PLH
t
PHL
Propagation
Delay Time
(EI - EO)
ns
t
PLH
t
PHL
Propagation
Delay Time
(EI - GS)
ns
t
PLH
t
PHL
Propagation
Delay Time
(EI - A0, A1, A2)
ns
C
IN
Input Capacitance
Power Dissipation
Capacitance
pF
C
PD
(*)
pF
(*) C
PD
isdefined asthe value ofthe IC’sinternal equivalent capactance which is calculated from the operating current consumption without load.
(Refer to Test Circuit).Average operting current can be obtained by thefollowingequation. I
CC
(opr) = C
PD
V
CC
f
IN
+ I
CC
INPUTWAVEFORM IS THE SAME AS THATIN CASEOF
SWITCHINGCHARACTERISTICSTEST.
SWITCHING CHARACTERISTICS TEST
CIRCUIT
TEST CIRCUIT I
CC
(Opr.)
M54/M74HC148
5/11
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