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开关复位芯片-ASL74LV3257S

开关复位芯片-ASL74LV3257S

ASL74LV3257S是厦门国科安芯科技有限公司推出的低压4位2:1 FET总线开关，TSSOP16L封装。芯片内置4路独立通道，由公共选择端S和使能端OE统一控制。其导通电阻典型值仅5Ω，传播延迟小于0.25ns，配合rail-to-rail摆幅与双向传输特性，信号几乎无损直通；功耗极低，适配2.5V/3.3V系统。内置Ioff掉电隔离功能，电源关闭时端口自动进入高阻态，防止反向电流倒灌，保障多电源域系统安全。器件广泛适用于多外设共享SPI/UART/I2S/JTAG接口切换、双Flash与双EEPROM存储器组选择、FPGA/CPU引脚复用、总线隔离与热插拔保护等场景，一颗芯片即可完成4路2选1切换，节省主控引脚、简化PCB布线，是数字系统总线复用与信号路由的理想之选。ASL74LV3257S采用先进抗辐照加固设计，可应用于商业航天、核电站等高安全需求场景。

Product Details典型应用Product Manual

Product Details

  • 电源电压范围：2.3V至3.6V
  • 两个端口之间的开关导通电阻5Ω
  • CMOS低功耗设计
  • IOFF电路支持局部断电模式工作
  • 闩锁效应耐受能力超过250mA
  • 数据I/O端口支持轨到轨切换
  • 工作温度范围：-55℃至+125℃
  • 封装: TSSOP16L
  • SEU: ≥37MeV.cm²/mg或10−5次/器件.天（商业航天级）
  • SEL: ≥37MeV.cm²/mg（商业航天级）
  • TID: ≥100krad（Si）（商业航天级）

封装类型：TSSOP16L

image.png


抗辐照：

  • SEU: ≥37MeV.cm²/mg或次/器件.天（商业航天级）
  • SEL: ≥37MeV.cm²/mg（商业航天级）
  • TID: ≥100krad（Si）（商业航天级）
ASL74LV3257S 1
ASL74LV3257S thumb 1

典型应用

01

时钟源冗余切换

星上时钟系统通常具备主备两路时钟源。ASL74LV3257S 为 4 位 1选2 FET多路复用/解复用器，可同时切换多路时钟（如系统时钟、SERDES 参考时钟、帧同步信号），开关导通电阻仅5Ω，传播延迟极小，对时钟抖动与占空比的影响可忽略。
02

JTAG 链路多目标切换

星载处理板常在同一 JTAG 链上挂载多个可编程器件。使用 ASL74LV3257S 可在多个目标之间切换调试链路而不改变链路拓扑；低导通电阻与轨到轨传输特性保证边界扫描信号完整性，便于在轨单机定位与程序更新。
03

SPI/存储器件的片选与数据切分

多片 SPI Flash 或配置存储器共用一组时钟与数据线时，可用多路复用器切换 CS 与 MISO 通道，减少处理器引脚占用。器件的 Ioff 特性保证在部分存储器件掉电时不会通过开关向掉电域倒灌电流。
04

采集通道扩展与信号路由

当采集系统的通道数超出后端处理能力时，可用 ASL74LV3257S 实现前端通道选择。轨到轨切换能力使其既可传输数字信号，也可用于模拟信号的选通，适合遥测参数的多点轮询采集。
05

板级诊断与备份通道切换

整机自检与在轨故障隔离需要在主通道与备份通道之间切换。ASL74LV3257S 的输出使能端（OE）可将整组通道置为高阻，实现故障通道的电气隔离，极小的传播延迟保证切换过程对数据传输时序影响最小。

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