SN54121_TI 具有施密特触发输入的单稳态多谐振荡器

SN54121的基本参数

制造厂商：TI
产品类别：逻辑和电压转换
技术类目：专用逻辑 IC - 单稳多谐振荡器（单稳态）
功能描述：具有施密特触发输入的单稳态多谐振荡器
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SN54121的产品详情：

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 V_CC 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. Input pulses may be of any duration relative to the output puls. Output pulse length may be varied from 40 nanoseconds to 28 seconds by choosing appropriate timing components. With no external timing components (i.e., R_int connected to V_CC, C_ext and R_ext/C_ext open), an output pulse of typically 30 or 35 nanoseconds is achieved which may be used as a d-c triggered reset signal. Output rise and fall times are TTL compatible and independent of pulse length.

Pulse width stability is achieved through internal compensation and is virtually independent of V_CC and temperature. In most application, pulse stability will only be limited by the accuracy of external timing components.

Jitter-free operation is maintained over the full temperature and V_CC ranges for more than six decades of timing capacitance (10 pF to 10 µF) and more than one decade of timing resistance (2 k may be used. Also, the range of jitter-free output pulse widths is extended if V_CC is held to 5 volts and free-air temperature is 25°C. Duty cycles as high as 90% are achieved when using maximum recommended R_T. Higher duty cycles are available if a certain amount of pulse-width jitter is allowed.

SN54121的优势和特性：

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

SN54121的参数（英文）：

Number of channels (#)
1
Supply voltage (Min) (V)
4.75
Supply voltage (Max) (V)
5.25
Technology Family
TTL
Input type
Schmitt-Trigger
Output type
Push-Pull
ICC (uA)
36000
IOL (Max) (mA)
16
IOH (Max) (mA)
-0.8
Features
Standard speed (tpd > 50ns)

SN54121具体的完整产品型号参数及价格（美元）：

SN54121的完整型号有：5962-9755301QCA、5962-9755301QDA、SN54121J、SNJ54121J、SNJ54121W，以下是这些产品的关键参数及官网采购报价：

5962-9755301QCA，工作温度：-55 to 125，封装：CDIP (J)-14，包装数量MPQ：1个，MSL 等级/回流焊峰值温度：N/A for Pkg Type，引脚镀层/焊球材料：SNPB，TI官网5962-9755301QCA的批量USD价格：7.627（1000+）

5962-9755301QDA，工作温度：-55 to 125，封装：CFP (W)-14，包装数量MPQ：1个，MSL 等级/回流焊峰值温度：N/A for Pkg Type，引脚镀层/焊球材料：SNPB，TI官网5962-9755301QDA的批量USD价格：14.778（1000+）

SN54121J，工作温度：-55 to 125，封装：CDIP (J)-14，包装数量MPQ：1个，MSL 等级/回流焊峰值温度：N/A for Pkg Type，引脚镀层/焊球材料：SNPB，TI官网SN54121J的批量USD价格：6.81（1000+）

SNJ54121J，工作温度：-55 to 125，封装：CDIP (J)-14，包装数量MPQ：1个，MSL 等级/回流焊峰值温度：N/A for Pkg Type，引脚镀层/焊球材料：SNPB，TI官网SNJ54121J的批量USD价格：7.627（1000+）

SNJ54121W，工作温度：-55 to 125，封装：CFP (W)-14，包装数量MPQ：1个，MSL 等级/回流焊峰值温度：N/A for Pkg Type，引脚镀层/焊球材料：SNPB，TI官网SNJ54121W的批量USD价格：14.778（1000+）

SN54121的评估套件：

SN54121的电路图解：

SN54121的评估套件：