SN74121 具有施密特触发器输入的单稳态多频振荡器
These multivibrators feature dual negative-transition-triggered inputs and a single positive-transition-triggered input which can be used as an inhibit input. Complementary output pulses are provided.
Pulse triggering occurs at a particular voltage level and is not directly related to the transition time of the input pulse. Schmitt-trigger input circuitry (TTL hysteresis) for the B input allow jitter-free triggering from inputs with transition rates as slow as 1 volt/second, providing the circuit with an excellent noise immunity of typically 1.2 volts. A high immunity to VCC noise of typically 1.5 volts is also provided by internal latching circuitry.
Once fired, the outputs are independent of further transitions of the inputs and are a function only of the timing components
| SN74121 | |
| Voltage Nodes(V) | 5 |
| Vcc range(V) | 4.75 to 5.25 |
| Input Level | TTL |
| Output Level | TTL |
| Rating | Catalog |
| Technology Family | TTL |
SN74121 特性
- Programmable Output Pulse Width With Rint...35 ns Typ With Rext/Cext ...40 ns to 28 Seconds
- Internal Compensation for Virtual Temperature Independence
- Jitter-Free Operation up to 90% Duty Cycle
- Inhibit Capability
SN74121 芯片订购指南
| 器件 | 状态 | 温度 | 价格（美元） | 封装 | 引脚 | 封装数量 | 封装载体 | 丝印标记 |
| SN74121D | ACTIVE | 0 to 70 | 3.00 | 1ku | SOIC (D) | 14 | 50 | TUBE | |
| SN74121DE4 | ACTIVE | 0 to 70 | 3.00 | 1ku | SOIC (D) | 14 | 50 | TUBE | |
| SN74121DG4 | ACTIVE | 0 to 70 | 3.00 | 1ku | SOIC (D) | 14 | 50 | TUBE | |
| SN74121DR | ACTIVE | 0 to 70 | 2.50 | 1ku | SOIC (D) | 14 | 2500 | LARGE T&R | |
| SN74121DRE4 | ACTIVE | 0 to 70 | 2.50 | 1ku | SOIC (D) | 14 | 2500 | LARGE T&R | |
| SN74121DRG4 | ACTIVE | 0 to 70 | 2.50 | 1ku | SOIC (D) | 14 | 2500 | LARGE T&R | |
| SN74121N | ACTIVE | 0 to 70 | 2.75 | 1ku | PDIP (N) | 14 | 25 | TUBE | |
| SN74121NE4 | ACTIVE | 0 to 70 | 2.75 | 1ku | PDIP (N) | 14 | 25 | TUBE |
SN74121 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 |
| SN74121D | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-1-260C-UNLIM | SN74121D | SN74121D |
| SN74121DE4 | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-1-260C-UNLIM | SN74121DE4 | SN74121DE4 |
| SN74121DG4 | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-1-260C-UNLIM | SN74121DG4 | SN74121DG4 |
| SN74121DR | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-1-260C-UNLIM | SN74121DR | SN74121DR |
| SN74121DRE4 | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-1-260C-UNLIM | SN74121DRE4 | SN74121DRE4 |
| SN74121DRG4 | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-1-260C-UNLIM | SN74121DRG4 | SN74121DRG4 |
| SN74121N | Pb-Free (RoHS) | CU NIPDAU | N/A for Pkg Type | SN74121N | SN74121N |
| SN74121NE4 | Pb-Free (RoHS) | CU NIPDAU | N/A for Pkg Type | SN74121NE4 | SN74121NE4 |
SN74121 应用技术支持与电子电路设计开发资源下载
- SN74121 数据资料 dataSheet 下载.PDF
- TI 德州仪器特殊逻辑产品选型与价格 . xls
- 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)