資料介紹
54LS257A/DM54LS257B/DM74LS257B,
54LS258A/DM54LS258B/DM74LS258B
TRI-STATEé Quad 2-Data Selectors/Multiplexers
General Description
These Schottky-clamped high-performance multiplexers
feature TRI-STATE outputs that can interface directly with
data lines of bus-organized systems. With all but one of the
common outputs disabled (at a high impedance state), the
low impedance of the single enabled output will drive the
bus line to a high or low logic level. To minimize the possibility
that two outputs will attempt to take a common bus to
opposite logic levels, the output enable circuitry is designed
such that the output disable times are shorter than the output
enable times.
This TRI-STATE output feature means that n-bit (paralleled)
data selectors with up to 258 sources can be implemented
for data buses. It also permits the use of standard TTL registers
for data retention throughout the system.
Features
Y TRI-STATE versions LS157 and LS158 with same pinouts
Y Schottky-clamped for significant improvement in A-C
performance
Y Provides bus interface from multiple sources in highperformance
systems
Y Average propagation delay from data input 12 ns
Y Typical power dissipation
LS257B 50 mW
LS258B 35 mW
Y Alternate military/aerospace devices (54LS257A/
54LS258A) are available. Contact a National Semiconductor
Sales Office/Distributor for specifications.
54LS258A/DM54LS258B/DM74LS258B
TRI-STATEé Quad 2-Data Selectors/Multiplexers
General Description
These Schottky-clamped high-performance multiplexers
feature TRI-STATE outputs that can interface directly with
data lines of bus-organized systems. With all but one of the
common outputs disabled (at a high impedance state), the
low impedance of the single enabled output will drive the
bus line to a high or low logic level. To minimize the possibility
that two outputs will attempt to take a common bus to
opposite logic levels, the output enable circuitry is designed
such that the output disable times are shorter than the output
enable times.
This TRI-STATE output feature means that n-bit (paralleled)
data selectors with up to 258 sources can be implemented
for data buses. It also permits the use of standard TTL registers
for data retention throughout the system.
Features
Y TRI-STATE versions LS157 and LS158 with same pinouts
Y Schottky-clamped for significant improvement in A-C
performance
Y Provides bus interface from multiple sources in highperformance
systems
Y Average propagation delay from data input 12 ns
Y Typical power dissipation
LS257B 50 mW
LS258B 35 mW
Y Alternate military/aerospace devices (54LS257A/
54LS258A) are available. Contact a National Semiconductor
Sales Office/Distributor for specifications.
下載該資料的人也在下載
下載該資料的人還在閱讀
更多 >
- 74LS257高速的硅柵CMOS器件芯片學習參考手冊 20次下載
- 74LS257英文手冊 0次下載
- 54LS257數據手冊 0次下載
- 74LS379/54LS379 pdf datasheet
- 74LS258/54LS258A pdf datasheet
- 74LS163A pdf datasheet
- 74LS161A pdf datasheet
- 54LS158/74LS158 pdf datasheet
- 74LS156/54LS156 pdf datasheet
- 74LS139/54LS139 pdf datasheet
- 74LS138/54LS138 pdf datasheet
- 74LS32/54LS32 pdf datasheet
- 74LS11/54LS11 pdf datasheet
- SN7402/SN54LS02/SN74LS02 pdf d
- 74LS257中文資料.pdf
- 74ls112引腳圖及功能詳解 74ls112的功能及原理 30.8w次閱讀
- 74ls123芯片主要功能是什么?74ls123能用什么代替? 3.5w次閱讀
- 74ls161與74ls163有什么區別 5.8w次閱讀
- 74ls160和74ls161區別 12.1w次閱讀
- 一文看懂74LS112和74LS76的區別 7.7w次閱讀
- 74ls09引腳圖及功能表_真值表和特性參數 3w次閱讀
- 74ls05中文資料匯總(74ls05引腳圖及功能_內部結構及特性參數) 3w次閱讀
- 74ls04和74hc04有什么區別_74ls04/74hc04簡介 2.7w次閱讀
- 74ls02中文資料匯總(74ls02引腳圖及功能_真值表及應用電路) 18.9w次閱讀
- 74ls00中文資料匯總(74ls00引腳圖及功能_工作原理及應用電路) 36.2w次閱讀
- 74LS00邏輯功能測試 6.2w次閱讀
- 74ls245是什么_74ls245使用方法_74ls245的作用是什么 3.6w次閱讀
- 74ls90和74ls290的區別是什么? 2.5w次閱讀
- 用74ls138設計全加器 14.9w次閱讀
- 74ls04與74ls08的區別_74ls04推挽電路原理分析 1.9w次閱讀
下載排行
本周
- 1TC358743XBG評估板參考手冊
- 1.36 MB | 330次下載 | 免費
- 2開關電源基礎知識
- 5.73 MB | 11次下載 | 免費
- 3嵌入式linux-聊天程序設計
- 0.60 MB | 3次下載 | 免費
- 4DIY動手組裝LED電子顯示屏
- 0.98 MB | 3次下載 | 免費
- 5基于FPGA的C8051F單片機開發板設計
- 0.70 MB | 2次下載 | 免費
- 651單片機窗簾控制器仿真程序
- 1.93 MB | 2次下載 | 免費
- 751單片機PM2.5檢測系統程序
- 0.83 MB | 2次下載 | 免費
- 8基于51單片機的RGB調色燈程序仿真
- 0.86 MB | 2次下載 | 免費
本月
- 1OrCAD10.5下載OrCAD10.5中文版軟件
- 0.00 MB | 234315次下載 | 免費
- 2555集成電路應用800例(新編版)
- 0.00 MB | 33566次下載 | 免費
- 3接口電路圖大全
- 未知 | 30323次下載 | 免費
- 4開關電源設計實例指南
- 未知 | 21549次下載 | 免費
- 5電氣工程師手冊免費下載(新編第二版pdf電子書)
- 0.00 MB | 15349次下載 | 免費
- 6數字電路基礎pdf(下載)
- 未知 | 13750次下載 | 免費
- 7電子制作實例集錦 下載
- 未知 | 8113次下載 | 免費
- 8《LED驅動電路設計》 溫德爾著
- 0.00 MB | 6656次下載 | 免費
總榜
- 1matlab軟件下載入口
- 未知 | 935054次下載 | 免費
- 2protel99se軟件下載(可英文版轉中文版)
- 78.1 MB | 537798次下載 | 免費
- 3MATLAB 7.1 下載 (含軟件介紹)
- 未知 | 420027次下載 | 免費
- 4OrCAD10.5下載OrCAD10.5中文版軟件
- 0.00 MB | 234315次下載 | 免費
- 5Altium DXP2002下載入口
- 未知 | 233046次下載 | 免費
- 6電路仿真軟件multisim 10.0免費下載
- 340992 | 191186次下載 | 免費
- 7十天學會AVR單片機與C語言視頻教程 下載
- 158M | 183279次下載 | 免費
- 8proe5.0野火版下載(中文版免費下載)
- 未知 | 138040次下載 | 免費
評論
查看更多