參數(shù)資料
型號: HD74HC148
廠商: Hitachi,Ltd.
英文描述: Dual 4-Input Positive-NAND Gates 20-LCCC -55 to 125
中文描述: 8到三線八進(jìn)制優(yōu)先編碼器
文件頁數(shù): 1/8頁
文件大?。?/td> 45K
代理商: HD74HC148
HD74HC148
8-to-3-line Octal Priority Encoder
Description
The HD74HC148 encodes eight data lines to three-line (4-2-1) binary (octal). Cascading circuitry (enable
input EI and enable output EO) is provided to allow octal expansion without the need for external circuitry.
The data inputs and outputs are active at the low logic level.
Features
High Speed Operation: t
pd
(0 - 7 to A
0
- A
2
) = 15 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)
Function Table
Inputs
Outputs
EI
0
1
2
3
4
5
6
7
A
2
H
A
1
H
A
0
H
GS
EO
H
X
X
X
X
X
X
X
X
H
H
L
H
H
H
H
H
H
H
H
H
H
H
H
L
L
X
X
X
X
X
X
X
L
L
L
L
L
H
L
X
X
X
X
X
X
L
H
L
L
H
L
H
L
X
X
X
X
X
L
H
H
L
H
L
L
H
L
X
X
X
X
L
H
H
H
L
H
H
L
H
L
X
X
X
L
H
H
H
H
H
L
L
L
H
L
X
X
L
H
H
H
H
H
H
L
H
L
H
L
X
L
H
H
H
H
H
H
H
H
L
L
H
L
H :
L
X :
L
H
H
H
H
H
H
H
H
H
H
L
H
High level
Low level
Irrelevant
:
相關(guān)PDF資料
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