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參數(shù)資料
| 型號(hào)： | 74ALS251D |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 通用總線功能 |
| 英文描述： | 8-input multiplexer 3-State |
| 中文描述： | ALS SERIES, 8 LINE TO 1 LINE MULTIPLEXER, COMPLEMENTARY OUTPUT, PDSO16 |
| 封裝： | PLASTIC, SO-16 |
| 文件頁數(shù)： | 2/8頁 |
| 文件大?。?/td> | 103K |
| 代理商： | 74ALS251D |
Philips Semiconductors
Product specification
74ALS251
8-input multiplexer (3-State)
2
1991 Feb 08
853–1377 01670
FEATURES
8-to-1 multiplexing
On chip decoding
Multifunction capability
Inverting and non-inverting outputs
Both outputs are 3-State for further multiplexer expansion
DESCRIPTION
The 74ALS251 is a logic implementation of a single 8-position
switch with the switch position controlled by the state of three select
(S0, S1, S2) inputs. True (Y) and complementary (Y) outputs are
both provided.
The output enable (OE) is active Low. When OE is High, both
outputs are in High impedance state, allowing multiple connections
to a common bus without driving nor loading the bus significantly.
When the outputs of more than one device are tied together, the
user must ensure that there is no overlap in the active-Low portion
of the output enable voltages in order to avoid high currents that
could exceed the maximum current rating.
TYPE
TYPICAL
PROPAGATION DELAY
TYPICAL
SUPPLY CURRENT
(TOTAL)
74ALS251
7.0ns
7.5mA
PIN CONFIGURATION
16
15
14
13
12
11
10
7
6
5
4
3
2
1
OE
V
CC
I7
S0
S1
I6
I4
I5
I3
I2
Y
I1
I0
Y
9
8
GND
S2
SC00066
ORDERING INFORMATION
ORDER CODE
DESCRIPTION
COMMERCIAL RANGE
V
CC
= 5V
±
10%,
T
amb
= 0
°
C to +70
°
C
DRAWING
NUMBER
16-pin plastic DIP
74ALS251N
SOT38-4
16-pin plastic SO
74ALS251D
SOT109-1
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS
DESCRIPTION
74ALS (U.L.)
HIGH/LOW
LOAD VALUE
HIGH/LOW
I0 – I7
Data inputs
1.0/1.0
20
μ
A/0.1mA
20
μ
A/0.1mA
20
μ
A/0.1mA
S0 – S2
Select inputs
1.0/1.0
OE
Output Enable input (active-Low)
1.0/1.0
Y, Y
One (1.0) ALS unit load is defined as: 20
μ
A in the High state and 0.1mA in the Low state.
Data outputs
130/240
2.5mA/24mA
NOTE:
LOGIC SYMBOL
V
= Pin 16
GND = Pin 8
SC00067
9
7
S2
OE
4
3
2
1
15
14
13
I0
I1
I2
I3
I4
I5
I6
Y
Y
5
6
12
I7
10
S1
11
S0
IEC/IEEE SYMBOL
SC00068
MUX
7
11
5
6
0
G0
7
10
2
9
4
3
2
1
15
14
13
12
EN
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 74ALS251 | 8-input multiplexer (3-State)(8輸入多路復(fù)用器（三態(tài)）) |
| 74ALS251N | 8-input multiplexer 3-State |
| 74ALS253D | Dual 4-input multiplexer 3-State |
| 74ALS253 | Dual 4-input multiplexer (3-State)(雙通道4輸入多路復(fù)用器（三態(tài)）) |
| 74ALS253N | Dual 4-input multiplexer 3-State |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 74ALS251N | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-input multiplexer 3-State |
| 74ALS253 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Dual 4-input multiplexer 3-State |
| 74ALS253D | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Dual 4-input multiplexer 3-State |
| 74ALS253DB | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Dual 4-input multiplexer 3-State |
| 74ALS253N | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Dual 4-input multiplexer 3-State |
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