CH9326
USB to dual UART bridge with independent baud rates for multi-port applications
Product Overview
Description
CH9326 is a USB-to-dual-UART bridge chip providing two independent serial ports from a single USB connection.
With independent baud rate configuration and hardware flow control, this chip is ideal for applications requiring multiple serial interfaces.
The chip supports baud rates up to 2Mbps on both ports simultaneously.
Product Series
CH
Primary Application
Multi-port serial adapters
Key Features
- Dual independent UART ports
- Up to 2Mbps per port
- Independent baud rate setting
- Hardware flow control per port
- 256-byte FIFO per port
- Virtual COM port support
- Built-in oscillator
- Low power consumption
Specifications
| USB | USB 2.0 Full Speed |
|---|---|
| UART | 2 independent ports |
| Baud Rate | Up to 2Mbps per port |
| Flow Control | RTS/CTS per port |
| IO Voltage | 5V/3.3V |
| FIFO | 256 bytes per port |
| Package | SSOP-20, QFN-24 |
| Temperature Range | -40°C to +85°C |
Applications
Multi-port serial adapters
Electronic system design
Industrial gateways
Industrial automation and control
Protocol converters
Power conversion and supply
Debug interfaces
Communication and interface
Test equipment
Electronic system design
Legacy device interfaces
Communication and interface
FAE Expert Insights
"CH9326 is perfect for applications needing dual serial ports. I've used it in industrial gateways that bridge between USB and multiple RS-485 networks. The independent baud rates are crucial when connecting to different devices. The 256-byte FIFOs prevent data loss at high baud rates. Both ports appear as separate COM ports in Windows, making software integration easy. The chip is reliable and the drivers are stable. Highly recommended for multi-port applications."
Dual UART ports from single USB connection
— Michael Zhang, BeiLuo