- 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:具有三态输出的四路 2 线路到 1 线路数据选择器/多路复用器
- 点击这里打开及下载SN74HCT257的技术文档资料
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The HCT257 devices are designed to multiplex signals from 4-bit data sources to 4-output data lines in bus-organized systems. The 3-state outputs do not load the data lines when the output-enable (OE)\ input is at the high logic level.
To ensure the high-impedance state during power up or power down, OE\ should be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
- Operating Voltage Range of 4.5 V to 5.5 V
- High-Current 3-State Outputs Interface Directly With System Bus
- Typical tpd = 17 ns
- Low Power Consumption, 80-μA Max ICC
- ±6-mA Output Drive at 5 V
- Low Input Current of 1 μA Max
- Inputs Are TTL-Voltage Compatible
- Provide Bus Interface From Multiple Sources in High-Performance Systems
- Buffered Inputs and Outputs
- Technology Family
- HCT
- Function
- Digital Multiplexer
- Configuration
- 2:1
- Number of channels (#)
- 4
- Operating temperature range (C)
- -40 to 85
- Rating
- Catalog
SN74HCT257的完整型号有:SN74HCT257D、SN74HCT257DR、SN74HCT257N,以下是这些产品的关键参数及官网采购报价:
SN74HCT257D,工作温度:-40 to 85,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SN74HCT257D的批量USD价格:.37(1000+)
SN74HCT257DR,工作温度:-40 to 85,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SN74HCT257DR的批量USD价格:.13(1000+)
SN74HCT257N,工作温度:-40 to 85,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SN74HCT257N的批量USD价格:.196(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。