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參數資料
| 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到三線八進制優先編碼器 |
| 文件頁數： | 1/8頁 |
| 文件大小： | 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
:
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| HD74HC149 | Dual 4-Input Positive-NAND Gates 14-CDIP -55 to 125 |
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| HD74HC14 | Hex Schmitt-trigger Inverters |
| HD74HC151 | Dual 4-Input Positive-NAND Gates 14-CFP -55 to 125 |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| HD74HC148FP(E) | 制造商:Renesas Electronics 功能描述:74HC 8-to-3 Line Priority Encoder Bulk |
| HD74HC14FP-E | 制造商:Renesas Electronics 功能描述:74HC Hex Schmitt Inverter 制造商:Renesas Electronics 功能描述:74HC Hex Schmitt Inverter Bulk 制造商:Renesas Electronics Corporation 功能描述:Logic, 74HC series, SOP-14 |
| HD74HC14P-E | 制造商:Renesas Electronics 功能描述:74HC Hex Schmitt Inverter |
| HD74HC14T(ELL-E) | 制造商:Renesas Electronics 功能描述:74HC Hex Schmitt Inverter Cut Tape |
| HD74HC154P | 制造商:Renesas Electronics 功能描述:74HC 4-to-16 Line Decoder Bulk |
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