參數(shù)資料
型號: HD74HC149
廠商: Hitachi,Ltd.
英文描述: Dual 4-Input Positive-NAND Gates 14-CDIP -55 to 125
中文描述: 8到8線優(yōu)先編碼器
文件頁數(shù): 5/9頁
文件大?。?/td> 60K
代理商: HD74HC149
HD74HC149
5
AC Characteristics
(C
L
= 50 pF, Input t
r
= t
f
= 6 ns)
Ta = 25
°
C
Ta = –40 to
+85
°
C
Item
Symbol
V
CC
(V)
2.0
Min Typ Max Min
Max
Unit
Test Conditions
0 - 7 to Y,
P
Propagation delay t
PLH
time
140 —
175
ns
t
PHL
4.5
16
28
35
6.0
24
30
t
PLH
t
PHL
2.0
155 —
195
ns
E
to Y,
P
4.5
13
31
39
6.0
26
33
Output rise/fall
t
TLH
t
THL
2.0
75
95
ns
time
4.5
5
15
19
6.0
13
16
Input capacitance
Cin
5
10
10
pF
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