SN74LS191 具有加/减模式控制的同步 4 位加/减计数器

The '190, 'LS190, '191, and 'LS191 are synchronous, reversible up/down counters having a complexity of 58 equivalent gates. The '191 and 'LS191 are 4-bit binary counters and the '190 and 'LS190 are BCD counters. Synchronous operation is provided by having all flip-flops clocked simultaneously so that the outputs change coincident with each other when so instructed by the steering logic. This mode of operation eliminates the output counting spikes normally associated with asynchronous (ripple clock) counters.

The outputs of the four master-slave flip-flops are triggered on a low-to-high transition of the clock input if the enable input is low. A high at the enable input inhibits counting. Level changes at the enable input should be made only when the clock input is high

SN74LS191
Rating Catalog  
Technology Family LS
SN74LS191 特性
SN74LS191 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
SN74LS191D ACTIVE 0 to 70 0.40 | 1ku SOIC (D) | 16 40 | TUBE  
SN74LS191DE4 ACTIVE 0 to 70 0.40 | 1ku SOIC (D) | 16 40 | TUBE  
SN74LS191DG4 ACTIVE 0 to 70 0.40 | 1ku SOIC (D) | 16 40 | TUBE  
SN74LS191DR ACTIVE 0 to 70 0.33 | 1ku SOIC (D) | 16 2500 | LARGE T&R  
SN74LS191DRE4 ACTIVE 0 to 70 0.33 | 1ku SOIC (D) | 16 2500 | LARGE T&R  
SN74LS191DRG4 ACTIVE 0 to 70 0.33 | 1ku SOIC (D) | 16 2500 | LARGE T&R  
SN74LS191N ACTIVE 0 to 70 0.35 | 1ku PDIP (N) | 16 25 | TUBE  
SN74LS191NE4 ACTIVE 0 to 70 0.35 | 1ku PDIP (N) | 16 25 | TUBE  
SN74LS191 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
SN74LS191D Green (RoHS & no Sb/Br)  CU NIPDAU  Level-1-260C-UNLIM SN74LS191D SN74LS191D
SN74LS191DE4 Green (RoHS & no Sb/Br)  CU NIPDAU  Level-1-260C-UNLIM SN74LS191DE4 SN74LS191DE4
SN74LS191DG4 Green (RoHS & no Sb/Br)  CU NIPDAU  Level-1-260C-UNLIM SN74LS191DG4 SN74LS191DG4
SN74LS191DR Green (RoHS & no Sb/Br)  CU NIPDAU  Level-1-260C-UNLIM SN74LS191DR SN74LS191DR
SN74LS191DRE4 Green (RoHS & no Sb/Br)  CU NIPDAU  Level-1-260C-UNLIM SN74LS191DRE4 SN74LS191DRE4
SN74LS191DRG4 Green (RoHS & no Sb/Br)  CU NIPDAU  Level-1-260C-UNLIM SN74LS191DRG4 SN74LS191DRG4
SN74LS191N Pb-Free (RoHS)  CU NIPDAU  N/A for Pkg Type SN74LS191N SN74LS191N
SN74LS191NE4 Pb-Free (RoHS)  CU NIPDAU  N/A for Pkg Type SN74LS191NE4 SN74LS191NE4
SN74LS191 应用技术支持与电子电路设计开发资源下载
  1. SN74LS191 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)