- 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 - 数字多路复用器和编码器
- 功能描述：具有三态输出的 8 线至 1 线数据选择器/多路复用器
- 点击这里打开及下载SN74LS251的技术文档资料
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These monolithic data selectors/multiplexers contain full on-chip binary decoding to select one-of-eight data sources and feature a strobe-controlled three-state output. The strobe must be at a low logic level to enable these devices. The three-state outputs permit a number of outputs to be connected to a common bus. When the strobe input is high, both outputs are in a high-impedance state in which both the upper and lower transistors of each totem-pole output are off, and the output neither drives nor loads the bus significantly. When the strobe is low, the outputs are activated and operate as standard TTL totem-pole outputs.
To minimize the possibility that two outputs will attempt to take a common bus to opposite logic levels, the output control circuitry is designed so that the average output disable time is shorter than the average output enable time. The SN54251 and SN74251 have output clamp diodes to attenuate reflections on the bus line.
- Three-State Versions of '151, 'LS151, 'S151
- Three State Outputs Interface Directly with System Bus
- Perform Parallel-to-Serial Conversion
- Permit Multiplexing from N-Lines to One Line
- Complementary Outputs Provide True and Inverted Data
- Fully Compatible with Most TTL Circuits
- Technology Family
- LS
- Function
- Digital Multiplexer
- Configuration
- 8:1
- Number of channels (#)
- 1
- Operating temperature range (C)
- 0 to 70
- Rating
- Catalog
SN74LS251的完整型号有：SN74LS251D、SN74LS251DR、SN74LS251N、SN74LS251NSR，以下是这些产品的关键参数及官网采购报价：
SN74LS251D，工作温度：0 to 70，封装：SOIC (D)-16，包装数量MPQ：40个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：NIPDAU，TI官网SN74LS251D的批量USD价格：.312（1000+）
SN74LS251DR，工作温度：0 to 70，封装：SOIC (D)-16，包装数量MPQ：2500个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：NIPDAU，TI官网SN74LS251DR的批量USD价格：.26（1000+）
SN74LS251N，工作温度：0 to 70，封装：PDIP (N)-16，包装数量MPQ：25个，MSL 等级/回流焊峰值温度：N/A for Pkg Type，引脚镀层/焊球材料：NIPDAU，TI官网SN74LS251N的批量USD价格：.299（1000+）
SN74LS251NSR，工作温度：0 to 70，封装：SO (NS)-16，包装数量MPQ：2000个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：NIPDAU，TI官网SN74LS251NSR的批量USD价格：.286（1000+）
14-24-LOGIC-EVM — 支持 14 到 24 引脚 PW、DB、D、DW、NS、DYY 和 DGV 封装的通用逻辑 EVM
该 EVM 设计用于支持采用 14 至 24 引脚 D、DW、DB、NS、PW、DYY 或 DGV 封装的任何逻辑器件。
