CD74HC257 具有同向三态输出的高速 CMOS 逻辑四路 2 输入多路复用器

The ’HC257 and ’HCT257 are quad 2-input multiplexers which select four bits of data from two sources under the control of a common Select Input (S). The Output Enable input (OE\) is active LOW. When OE\ is HIGH, all of the outputs (1Y-4Y) are in the high impedance state regardless of all other input conditions.

Moving data from two groups of registers to four common output buses is a common use of the 257. The state of the Select input determines the particular register from which the data comes. It can also be used as a function generator

CD74HC257
Rating Catalog  
Technology Family HC
CD74HC257 特性
CD74HC257 芯片订购指南
器件 状态 温度 价格 封装 | 引脚 封装数量 | 封装载体 丝印标记
CD74HC257E ACTIVE -55 to 125 0.39 | 1ku PDIP (N) | 16 25 | TUBE  
CD74HC257EE4 ACTIVE -55 to 125 0.39 | 1ku PDIP (N) | 16 25 | TUBE  
CD74HC257M ACTIVE -55 to 125 0.42 | 1ku SOIC (D) | 16 40 | TUBE  
CD74HC257M96 ACTIVE -55 to 125 0.35 | 1ku SOIC (D) | 16 2500 | LARGE T&R  
CD74HC257M96E4 ACTIVE -55 to 125 0.35 | 1ku SOIC (D) | 16 2500 | LARGE T&R  
CD74HC257M96G4 ACTIVE -55 to 125 0.35 | 1ku SOIC (D) | 16 2500 | LARGE T&R  
CD74HC257ME4 ACTIVE -55 to 125 0.42 | 1ku SOIC (D) | 16 40 | TUBE  
CD74HC257MG4 ACTIVE -55 to 125 0.42 | 1ku SOIC (D) | 16 40 | TUBE  
CD74HC257 质量与无铅数据
器件 环保计划* 铅/焊球涂层 MSL 等级/回流焊峰 环保信息与无铅 (Pb-free) DPPM / MTBF / FIT 率
CD74HC257E Pb-Free (RoHS)  CU NIPDAU  N/A for Pkg Type CD74HC257E CD74HC257E
CD74HC257EE4 Pb-Free (RoHS)  CU NIPDAU  N/A for Pkg Type CD74HC257EE4 CD74HC257EE4
CD74HC257M Green (RoHS & no Sb/Br)  CU NIPDAU  Level-1-260C-UNLIM CD74HC257M CD74HC257M
CD74HC257M96 Green (RoHS & no Sb/Br)  CU NIPDAU  Level-1-260C-UNLIM CD74HC257M96 CD74HC257M96
CD74HC257M96E4 Green (RoHS & no Sb/Br)  CU NIPDAU  Level-1-260C-UNLIM CD74HC257M96E4 CD74HC257M96E4
CD74HC257M96G4 Green (RoHS & no Sb/Br)  CU NIPDAU  Level-1-260C-UNLIM CD74HC257M96G4 CD74HC257M96G4
CD74HC257ME4 Green (RoHS & no Sb/Br)  CU NIPDAU  Level-1-260C-UNLIM CD74HC257ME4 CD74HC257ME4
CD74HC257MG4 Green (RoHS & no Sb/Br)  CU NIPDAU  Level-1-260C-UNLIM CD74HC257MG4 CD74HC257MG4
CD74HC257 应用技术支持与电子电路设计开发资源下载
  1. CD74HC257 数据资料 dataSheet 下载.PDF
  2. TI 德州仪器MSI 功能产品选型与价格 . xls
  3. Logic Guide 2009 (PDF 4263 KB)
  4. Shelf-Life Evaluation of Lead-Free Component Finishes (PDF 1305 KB)
  5. Understanding and Interpreting Standard-Logic Data Sheets (PDF 857 KB)
  6. TI IBIS File Creation, Validation, and Distribution Processes (PDF 380 KB)
  7. Implications of Slow or Floating CMOS Inputs (PDF 101 KB)
  8. CMOS Power Consumption and CPD Calculation (PDF 89 KB)
  9. Designing With Logic (PDF 186 KB)
  10. Live Insertion (PDF 150 KB)
  11. Input and Output Characteristics of Digital Integrated Circuits (PDF 1708 KB)
  12. Using High Speed CMOS and Advanced CMOS in Systems With Multiple Vcc (PDF 43 KB)
  13. HiRel Unitrode Power Management Brochure (PDF 206 KB)
  14. LOGIC Pocket Data Book (PDF 6001 KB)
  15. HiRel Unitrode Power Management Brochure (PDF 206 KB)
  16. Logic Cross-Reference (PDF 2938 KB)