SN74LS390 双路 4 位十进制和二进制计数器
Each of these monolithic circuits contains eight master-slave flip-flops and additional gating to implement two individual four-bit counters in a single package. The '390 and 'LS390 incorporate dual divide-by-two and divide-by-five counters, which can be used to implement cycle lengths equal to any whole and/or cumulative multiples of 2 and/or 5 up to divide-by-100. When connected as a bi-quinary counter, the separate divide-by-two circuit can be used to provide symmetry (a square wave) at the final output stage. The '393 and 'LS393 each comprise two independent four-bit binary counters each having a clear and a clock input. N-bit binary counters can be implemented with each package providing the capability of divide-by-256.
| SN74LS390 | |
| Rating | Catalog |
| Technology Family | LS |
SN74LS390 特性
- Dual Versions of the Popular '90A, 'LS90 and '93A, 'LS93
- '390, 'LS390 … Individual Clocks for A and B Flip-Flops Provide Dual ÷ 2 and ÷ 5 Counters
- '393, 'LS393 … Dual 4-Bit Binary Counter with Individual Clocks
- All Have Direct Clear for Each 4-Bit Counter
- Dual 4-Bit Versions Can Significantly Improve System Densities by Reducing Counter Package Count by 50%
- Typical Maximum Count Frequency … 35 MHz
- Buffered Outputs Reduce Possibility of Collector Commutation
SN74LS390 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 |
| SN74LS390D | ACTIVE | 0 to 70 | 1.15 | 1ku | SOIC (D) | 16 | 40 | TUBE | |
| SN74LS390DE4 | ACTIVE | 0 to 70 | 1.15 | 1ku | SOIC (D) | 16 | 40 | TUBE | |
| SN74LS390DG4 | ACTIVE | 0 to 70 | 1.15 | 1ku | SOIC (D) | 16 | 40 | TUBE | |
| SN74LS390DR | ACTIVE | 0 to 70 | 0.95 | 1ku | SOIC (D) | 16 | 2500 | LARGE T&R | |
| SN74LS390DRE4 | ACTIVE | 0 to 70 | 0.95 | 1ku | SOIC (D) | 16 | 2500 | LARGE T&R | |
| SN74LS390DRG4 | ACTIVE | 0 to 70 | 0.95 | 1ku | SOIC (D) | 16 | 2500 | LARGE T&R | |
| SN74LS390N | ACTIVE | 0 to 70 | 1.05 | 1ku | PDIP (N) | 16 | 25 | TUBE | |
| SN74LS390NE4 | ACTIVE | 0 to 70 | 1.05 | 1ku | PDIP (N) | 16 | 25 | TUBE |
SN74LS390 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 |
| SN74LS390D | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-1-260C-UNLIM | SN74LS390D | SN74LS390D |
| SN74LS390DE4 | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-1-260C-UNLIM | SN74LS390DE4 | SN74LS390DE4 |
| SN74LS390DG4 | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-1-260C-UNLIM | SN74LS390DG4 | SN74LS390DG4 |
| SN74LS390DR | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-1-260C-UNLIM | SN74LS390DR | SN74LS390DR |
| SN74LS390DRE4 | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-1-260C-UNLIM | SN74LS390DRE4 | SN74LS390DRE4 |
| SN74LS390DRG4 | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-1-260C-UNLIM | SN74LS390DRG4 | SN74LS390DRG4 |
| SN74LS390N | Pb-Free (RoHS) | CU NIPDAU | N/A for Pkg Type | SN74LS390N | SN74LS390N |
| SN74LS390NE4 | Pb-Free (RoHS) | CU NIPDAU | N/A for Pkg Type | SN74LS390NE4 | SN74LS390NE4 |
SN74LS390 应用技术支持与电子电路设计开发资源下载
- SN74LS390 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)