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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)： | 1/9頁 |
| 文件大?。?/td> | 60K |
| 代理商： | HD74HC149 |
HD74HC149
8-to-8-line Priority Encoder
Description
The HD74HC149 is priority encoder which has 8 input lines (0 - 7) and 8 output lies (Y
0
- Y
7
).
It is the logical combination of a HD74HC148 8-3 line priority encoder driving a HD74HC138 3-8 line
decoder.
Only one request output can be low at a time. The output that is low is dependent on the highest priority
request that is low. The order of priority is 7 highest and 0 lowest.
When
E
input is high, all outputs are high.
When a output (Y
0
- Y
7
) is low,
P
output is low and this indicates active condition.
Features
High Speed Operation: t
pd
(0 - 7 to Y) = 16 ns typ (C
L
= 50 pF)
High Output Current: Fanout of 10 LSTTL Loads
Wide Operating Voltage: V
CC
= 2 to 6 V
Low Input Current: 1 μA max
Low Quiescent Supply Current: I
CC
(static) = 4 μA max (Ta = 25°C)
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