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参数资料
| 型号： | SN74LS251M |
| 厂商： | ON SEMICONDUCTOR |
| 元件分类： | 编、解码器及复用、解复用 |
| 英文描述： | LS SERIES, 8 LINE TO 1 LINE MULTIPLEXER, COMPLEMENTARY OUTPUT, PDSO16 |
| 封装： | EIAJ, SOP-16 |
| 文件页数： | 3/8页 |
| 文件大小： | 225K |
| 代理商： | SN74LS251M |
SN74LS251
http://onsemi.com
3
FUNCTIONAL DESCRIPTION
The LS251 is a logical implementation of a single pole,
8-position switch with the switch position controlled by the
state of three Select inputs, S0, S1, S2. Both assertion and
negation outputs are provided. The Output Enable input
(EO) is active LOW. When it is activated, the logic function
provided at the output is:
Z = EO (I0 S0 S1 S2 + I1 S0 S1 S2 + I2 S0 S1
Z = EO S2 + I3 S0 S1 S2 + I4 S0 S1 S2 + I5 S0
Z = EO S1 S2 + I6 S0 S1 S2 + I7 S0 S1 S2).
When the Output Enable is HIGH, both outputs are in the
high impedance (high Z) state. This feature allows
multiplexer expansion by tying the outputs of up to 128
devices together. When the outputs of the 3-state devices are
tied together, all but one device must be in the high
impedance state to avoid high currents that would exceed the
maximum ratings. The Output Enable signals should be
designed to ensure there is no overlap in the active LOW
portion of the enable voltage.
TRUTH TABLE
E0
S2
S1
S0
I0
I1
I2
I3
I4
I5
I6
I7
Z
H
X
(Z)
L
LL
L
XX
X
H
L
LL
H
XX
X
L
H
L
LH
X
LX
X
H
L
LH
X
HX
X
L
H
L
HL
X
XL
X
H
L
HL
X
XH
X
L
H
L
HH
X
XX
L
X
H
L
HH
X
XX
H
X
L
H
L
H
LL
X
XX
X
L
X
H
L
H
LL
X
XX
X
H
X
L
H
L
H
LH
X
XX
X
L
X
H
L
H
LH
X
XX
X
H
X
L
H
L
H
HL
X
XX
X
L
X
H
L
H
HL
X
XX
X
H
X
L
H
L
H
HH
X
XX
X
L
H
L
H
X
H
L
H
H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
(Z) = High impedance (Off)
相关PDF资料 |
PDF描述 |
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| SN74LS253N-10 | LS SERIES, DUAL 4 LINE TO 1 LINE MULTIPLEXER, TRUE OUTPUT, PDIP16 |
| SN54LS253J-00 | LS SERIES, DUAL 4 LINE TO 1 LINE MULTIPLEXER, TRUE OUTPUT, CDIP16 |
| SN74LS257BMR1 | LS SERIES, QUAD 2 LINE TO 1 LINE MULTIPLEXER, TRUE OUTPUT, PDSO16 |
| SN74LS258BDR2 | LS SERIES, QUAD 2 LINE TO 1 LINE MULTIPLEXER, INVERTED OUTPUT, PDSO16 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SN74LS251MEL | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| SN74LS251N | 功能描述:编码器、解码器、复用器和解复用器 8 to 1 RoHS:否 制造商:Micrel 产品:Multiplexers 逻辑系列:CMOS 位数: 线路数量（输入/输出）:2 / 12 传播延迟时间:350 ps, 400 ps 电源电压-最大:2.625 V, 3.6 V 电源电压-最小:2.375 V, 3 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Tray |
| SN74LS251N | 制造商:Texas Instruments 功能描述:Logic - Multiplexer and Demultiplexer I |
| SN74LS251N3 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| SN74LS251NDS | 制造商:Motorola Inc 功能描述:LOGIC MUX, SINGLE, 8-INPUT, LS-TTL, 16 Pin, Plastic, DIP |
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