SN74AS869 同步 8 位加/减计数器
These synchronous, presettable, 8-bit up/down counters feature internal-carry look-ahead circuitry for cascading in high-speed counting applications. Synchronous operation is provided by having all flip-flops clocked simultaneously so that the outputs change coincidentally with each other when so instructed by the count-enable (
,) inputs and internal gating. This mode of operation eliminates the output counting spikes normally associated with asynchronous (ripple-clock) counters. A buffered clock (CLK) input triggers the eight flip-flops on the rising (positive-going) edge of the clock waveform.
These counters are fully programmable; they may be preset to any number between 0 and 255. The load-input circuitry allows parallel loading of the cascaded counters
| SN74AS869 | |
| Rating | Catalog |
| Technology Family | AS |
SN74AS869 特性
- Fully Programmable With Synchronous Counting and Loading
- SN74AS869 and 'AS867 Have Asynchronous Clear; SN74AS869 and 'AS869 Have Synchronous Clear
- Fully Independent Clock Circuit Simplifies Use
- Ripple-Carry Output for n-Bit Cascading
- Package Options Include Plastic Small-Outline (DW) Packages, Ceramic Chip Carriers (FK), and Standard Plastic (NT) and Ceramic (JT) 300-mil DIPs
SN74AS869 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 |
| SN74AS869DW | ACTIVE | 0 to 70 | 3.55 | 1ku | SOIC(DW) | 24 | 2000 | LARGE T&R | |
| SN74AS869DWE4 | ACTIVE | 0 to 70 | 3.55 | 1ku | SOIC(DW) | 24 | 2000 | LARGE T&R | |
| SN74AS869DWG4 | ACTIVE | 0 to 70 | 3.55 | 1ku | SOIC(DW) | 24 | 2000 | LARGE T&R | |
| SN74AS869N | ACTIVE | 0 to 70 | 3.90 | 1ku | PDIP (N) | 20 | 20 | TUBE | |
| SN74AS869NE4 | ACTIVE | 0 to 70 | 3.90 | 1ku | PDIP (N) | 20 | 20 | TUBE |
SN74AS869 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 |
| SN74AS869DW | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-1-260C-UNLIM | SN74AS869DW | SN74AS869DW |
| SN74AS869DWE4 | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-1-260C-UNLIM | SN74AS869DWE4 | SN74AS869DWE4 |
| SN74AS869DWG4 | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-1-260C-UNLIM | SN74AS869DWG4 | SN74AS869DWG4 |
| SN74AS869N | Pb-Free (RoHS) | CU NIPDAU | N/A for Pkg Type | SN74AS869N | SN74AS869N |
| SN74AS869NE4 | Pb-Free (RoHS) | CU NIPDAU | N/A for Pkg Type | SN74AS869NE4 | SN74AS869NE4 |
SN74AS869 应用技术支持与电子电路设计开发资源下载
- SN74AS869 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)