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参数资料
| 型号： | SN74LS155DR2 |
| 厂商： | ON SEMICONDUCTOR |
| 元件分类： | 编、解码器及复用、解复用 |
| 英文描述： | LS SERIES, OTHER DECODER/DRIVER, INVERTED OUTPUT, PDSO16 |
| 封装： | SOIC-16 |
| 文件页数： | 2/4页 |
| 文件大小： | 129K |
| 代理商： | SN74LS155DR2 |
SN74LS155
http://onsemi.com
2
SN54/74LS156
LOGIC DIAGRAM
Ea Ea
A0 A1
Eb Eb
O0a
O1a
O2a
O3a
O0b
O1b
O2b
O3b
14
12
6
7
3
4
5
9
11
12
10
13
15
VCC = PIN 16
GND = PIN 8
= PIN NUMBERS
FUNCTIONAL DESCRIPTION
The LS156 is a Dual 1-of-4 Decoder/Demultiplexer with
common Address inputs and separate gated Enable inputs.
When enabled, each decoder section accepts the binary
weighted Address inputs (A0, A1) and provides four mutually
exclusive active LOW outputs (O0O3). If the Enable
requirements of each decoder are not met, all outputs of that
decoder are HIGH.
Each decoder section has a 2-input enable gate. The
enable gate for Decoder “a” requires one active HIGH input
and one active LOW input (EaEa). In demultiplexing
applications, Decoder “a” can accept either true or
complemented data by using the Ea or Ea inputs respectively.
The enable gate for Decoder “b” requires two active LOW
inputs (EbEb). The LS155 or LS156 can be used as a 1-of-8
Decoder/Demultiplexer by tying Ea to Eb and relabeling the
common connection as (A2). The other Eb and Ea are
connected together to form the common enable.
The LS156 can be used to generate all four minterms of
two variables. These four minterms are useful in some
applications replacing multiple gate functions as shown in
Fig. a. The LS156 has the further advantage of being able to
AND the minterm functions by tying outputs together. Any
number of terms can be wired-AND as shown below.
f = (E + A0 + A1) (E + A0 + A1) (E + A0 + A1)
(E + A0 + A1)
where E = Ea + Ea; E = Eb + Eb
Figure a
E
A0
A1
E
A0
A1
E
A0
A1
E
A0
A1
O0
O1
O2
O3
E
A0
A1
E
A0
A1
E
A0
A1
E
A0
A1
O0
O1
O2
O3
TRUTH TABLE
ADDRESS
ENABLE “a”
OUTPUT “a”
ENABLE “b”
OUTPUT “b”
A0
A1
Ea
O0
O1
O2
O3
Eb
O0
O1
O2
O3
X
L
X
H
X
H
X
XX
HH
HX
HH
H
L
LH
LL
HH
H
L
LL
HH
H
LH
H
L
LH
H
L
HH
LH
HL
H
L
LH
HL
H
L
H
L
H
L
H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
相关PDF资料 |
PDF描述 |
|---|---|
| SN74LS155JDS | LS SERIES, OTHER DECODER/DRIVER, INVERTED OUTPUT, CDIP16 |
| SN74LS156NDS | LS SERIES, OTHER DECODER/DRIVER, INVERTED OUTPUT, PDIP16 |
| SN74LS155NDS | LS SERIES, OTHER DECODER/DRIVER, INVERTED OUTPUT, PDIP16 |
| SN74LS157MEL | LS SERIES, QUAD 2 LINE TO 1 LINE MULTIPLEXER, TRUE OUTPUT, PDSO16 |
| SN74LS157ND | LS SERIES, QUAD 2 LINE TO 1 LINE MULTIPLEXER, TRUE OUTPUT, PDIP16 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| SN74LS155MEL | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| SN74LS155ML1 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| SN74LS155N | 制造商:ON Semiconductor 功能描述:Decoder/Demultiplexer Single/Dual 3/2-to-8/4 16-Pin PDIP 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| SN74LS156D | 功能描述:编码器、解码器、复用器和解复用器 Dual 2 to 4-Line Decoder/DeMltplxr 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 |
| SN74LS156DE4 | 功能描述:编码器、解码器、复用器和解复用器 Dual 2 to 4-Line Decoder/DeMltplxr 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 |
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