CH341B overview
CH341B is a component documented by Nanjing Qinheng Microel. The PDF description identifies it as "Bus switching chip." This guide condenses the most useful engineering information from the available PDF so that designers and sourcing teams can identify the checks that still need confirmation in the original document.
Datasheet snapshot
- Manufacturer: Nanjing Qinheng Microel...
- Part number: CH341B
- Category: IC
- Datasheet length: 12 Pages
Specifications and operating details
The following points were extracted from the PDF text. Check the associated conditions, notes and limits in the complete document before using a value in a design.
- 绝对最大值（临界或者超过绝对最大值将可能导致芯片工作不正常甚至损坏） 名称 参数说明 最小值 最大值 单位 TA 工作时的 环境温度 CH341B/F/C/A/T/H芯片，外部时钟 -40 85 ℃ CH341B/F/C芯片，内置时钟 -20 70 ℃ TS 储存时的环境温度 -55 100 ℃ VCC 电源电压（VCC接电源，GND接地） -0.5 6.5 V VIO 输入或者输出引脚上的电压 -0.5 VCC+0.5 V 6.2.
- 打印口时序参数（测试条件：TA=25℃，VCC=5V或者VCC=V3=3.3V，参考附图） CH341中文手册（一） ９ 名称 参数说明 最小值 典型值 最大值 单位 TWPRT 数据选通STB#的 低电平有效宽度 低速 800 840 10000 nS 高速 400 420 10000 nS TSPRT 数据选通STB#的 高电平间隔宽度 低速 800 nS 高速 560 nS TDS STB#有效前的数据建立时间 240 nS TDH STB#有效后的数据保持时间 24.
- 基本连接/外部时钟（下图） P3 是USB 端口，USB 总线包括一对5V 电源线和一对数据信号线，通常，+5V 电源线是红色，接 地线是黑色，D+信号线是绿色，D-信号线是白色。USB 总线提供的电源电流通常可以达到500mA，一 般情况下，CH341 芯片和低功耗的USB 产品可以直接使用USB 总线提供的5V 电源。如果USB 产品通 过其它供电方式提供常备电源，那么CH341也应该使用该常备电源，如果需要同时使用USB总线的电 源，那么可以通过阻值约为1Ω的电阻连接.
Engineering review checklist
- Confirm supply rails, clock limits, memory size, peripheral mapping and I/O voltage compatibility.
- Check package pinout, boot configuration, programming interface and silicon-revision errata.
- Budget decoupling, thermal margin, startup timing and firmware recovery behavior before release.
Always confirm values against the latest manufacturer-controlled datasheet, especially when qualifying a substitute or releasing a production BOM.
View the complete PDF and model record
Open the CH341B datasheet and model details to review the complete PDF, document pages and available product information.
Source attribution
Adapted from the PDF associated with this DigiCamel model page.
Source model URL: https://www.digicamel.com/product.php?slug=ch341b-nanjing-qinheng-microel