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参数资料
| 型号： | DM74LS138SJ |
| 厂商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分类： | 通用总线功能 |
| 英文描述： | Decoder/Demultiplexer |
| 中文描述： | LS SERIES, OTHER DECODER/DRIVER, INVERTED OUTPUT, PDSO16 |
| 封装： | 5.30 MM, EIAJ TYPE2, SOP-16 |
| 文件页数： | 1/7页 |
| 文件大小： | 81K |
| 代理商： | DM74LS138SJ |
2000 Fairchild Semiconductor Corporation
DS006391
www.fairchildsemi.com
August 1986
Revised March 2000
D
DM74LS138 DM74LS139
Decoder/Demultiplexer
General Description
These Schottky-clamped circuits are designed to be used
in high-performance memory-decoding or data-routing
applications, requiring very short propagation delay times.
In high-performance memory systems these decoders can
be used to minimize the effects of system decoding. When
used with high-speed memories, the delay times of these
decoders are usually less than the typical access time of
the memory. This means that the effective system delay
introduced by the decoder is negligible.
The DM74LS138 decodes one-of-eight lines, based upon
the conditions at the three binary select inputs and the
three enable inputs. Two active-low and one active-high
enable inputs reduce the need for external gates or invert-
ers when expanding. A 24-line decoder can be imple-
mented with no external inverters, and a 32-line decoder
requires only one inverter. An enable input can be used as
a data input for demultiplexing applications.
The DM74LS139 comprises two separate two-line-to-four-
line decoders in a single package. The active-low enable
input can be used as a data line in demultiplexing applica-
tions.
All of these decoders/demultiplexers feature fully buffered
inputs, presenting only one normalized load to its driving
circuit. All inputs are clamped with high-performance
Schottky diodes to suppress line-ringing and simplify sys-
tem design.
Features
I
Designed specifically for high speed:
Memory decoders
Data transmission systems
I
DM74LS138 3-to-8-line decoders incorporates 3 enable
inputs to simplify cascading and/or data reception
I
DM74LS139 contains two fully independent 2-to-4-line
decoders/demultiplexers
I
Schottky clamped for high performance
I
Typical propagation delay (3 levels of logic)
DM74LS138
21 ns
DM74LS139
21 ns
I
Typical power dissipation
DM74LS138
32 mW
DM74LS139
34 mW
Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Order Number
DM74LS138M
DM74LS138SJ
DM74LS138N
DM74LS139M
DM74LS139SJ
DM74LS139N
Package Number
M16A
M16D
N16E
M16A
M16D
N16E
Package Description
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
相关PDF资料 |
PDF描述 |
|---|---|
| DM74LS139M | Decoder/Demultiplexer |
| DM74LS139N | Decoder/Demultiplexer |
| DM74LS139SJ | Decoder/Demultiplexer |
| DM74LS138MX | 3-To-8-Line Demultiplexer |
| DM74LS138SJX | 3-To-8-Line Demultiplexer |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DM74LS138SJX | 功能描述:编码器、解码器、复用器和解复用器 3-to-8 Line Dec/Dem 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 |
| DM74LS139 WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| DM74LS139M | 功能描述:编码器、解码器、复用器和解复用器 Dl 2-to-4 Ln Dec/Dem 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 |
| DM74LS139MX | 功能描述:编码器、解码器、复用器和解复用器 Dl 2-to-4 Ln Dec/Dem 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 |
| DM74LS139N | 功能描述:编码器、解码器、复用器和解复用器 Dl 2-to-4 Ln Dec/Dem 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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