SN74AS257 具有三态输出的四路 2 线路至 1 线路数据选择器/多路复用器
These data selectors/multiplexers are designed to multiplex signals from 4-bit data sources to 4-output data lines in bus-organized systems. The 3-state outputs do not load the data lines when the output-enable (
) input is at a high logic level.
The SN54ALS257A and SN54ALS258A are characterized for operation over the full military temperature range of -55°C to 125°C. The SN74ALS257A, SN74ALS258A, SN74AS257, and SN74AS258 are characterized for operation from 0°C to 70°C
| SN74AS257 | |
| Rating | Catalog |
| Technology Family | AS |
SN74AS257 特性
- 3-State Outputs Interface Directly With System Bus
- Provide Bus Interface From Multiple Sources in High-Performance Systems
- Package Options Include Plastic Small-Outline (D) Packages, Ceramic Chip Carriers (FK), and Standard Plastic (N) and Ceramic (J) 300-mil DIPs
SN74AS257 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 |
| SN74AS257D | ACTIVE | 0 to 70 | 0.95 | 1ku | SOIC (D) | 16 | 40 | TUBE | |
| SN74AS257DE4 | ACTIVE | 0 to 70 | 0.95 | 1ku | SOIC (D) | 16 | 40 | TUBE | |
| SN74AS257DG4 | ACTIVE | 0 to 70 | 0.95 | 1ku | SOIC (D) | 16 | 40 | TUBE | |
| SN74AS257DR | ACTIVE | 0 to 70 | 0.80 | 1ku | SOIC (D) | 16 | 2500 | LARGE T&R | |
| SN74AS257DRE4 | ACTIVE | 0 to 70 | 0.80 | 1ku | SOIC (D) | 16 | 2500 | LARGE T&R | |
| SN74AS257DRG4 | ACTIVE | 0 to 70 | 0.80 | 1ku | SOIC (D) | 16 | 2500 | LARGE T&R | |
| SN74AS257N | ACTIVE | 0 to 70 | 0.90 | 1ku | PDIP (N) | 16 | 25 | TUBE | |
| SN74AS257NE4 | ACTIVE | 0 to 70 | 0.90 | 1ku | PDIP (N) | 16 | 25 | TUBE |
SN74AS257 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 |
| SN74AS257D | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-1-260C-UNLIM | SN74AS257D | SN74AS257D |
| SN74AS257DE4 | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-1-260C-UNLIM | SN74AS257DE4 | SN74AS257DE4 |
| SN74AS257DG4 | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-1-260C-UNLIM | SN74AS257DG4 | SN74AS257DG4 |
| SN74AS257DR | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-1-260C-UNLIM | SN74AS257DR | SN74AS257DR |
| SN74AS257DRE4 | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-1-260C-UNLIM | SN74AS257DRE4 | SN74AS257DRE4 |
| SN74AS257DRG4 | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-1-260C-UNLIM | SN74AS257DRG4 | SN74AS257DRG4 |
| SN74AS257N | Pb-Free (RoHS) | CU NIPDAU | N/A for Pkg Type | SN74AS257N | SN74AS257N |
| SN74AS257NE4 | Pb-Free (RoHS) | CU NIPDAU | N/A for Pkg Type | SN74AS257NE4 | SN74AS257NE4 |
SN74AS257 应用技术支持与电子电路设计开发资源下载
- SN74AS257 数据资料 dataSheet 下载.PDF
- TI 德州仪器MSI 功能产品选型与价格 . xls
- Logic Guide 2009 (PDF 4263 KB)
- Shelf-Life Evaluation of Lead-Free Component Finishes (PDF 1305 KB)
- Understanding and Interpreting Standard-Logic Data Sheets (PDF 857 KB)
- TI IBIS File Creation, Validation, and Distribution Processes (PDF 380 KB)
- Implications of Slow or Floating CMOS Inputs (PDF 101 KB)
- CMOS Power Consumption and CPD Calculation (PDF 89 KB)
- Designing With Logic (PDF 186 KB)
- Live Insertion (PDF 150 KB)
- Input and Output Characteristics of Digital Integrated Circuits (PDF 1708 KB)
- Using High Speed CMOS and Advanced CMOS in Systems With Multiple Vcc (PDF 43 KB)
- HiRel Unitrode Power Management Brochure (PDF 206 KB)
- LOGIC Pocket Data Book (PDF 6001 KB)
- HiRel Unitrode Power Management Brochure (PDF 206 KB)
- Logic Cross-Reference (PDF 2938 KB)