AX99100

The AX99100 is a high-performance PCIe to Quad Serial controller developed by ASIX Electronics. It supports four independent UART channels, each configurable for RS-232, RS-422, or RS-485 operation, making it ideal for industrial and embedded applications requiring multi-port serial communication.
Key features include:
- PCIe 2.0 x1 interface for high-speed data transfer.
- 128-byte FIFOs per UART to reduce CPU overhead.
- Hardware flow control (RTS/CTS) and software-selectable baud rates up to 6 Mbps.
- Low power consumption and industrial temperature range support (-40°C to +85°C).
The AX99100 is commonly used in POS systems, factory automation, and networking equipment, offering reliable serial expansion for legacy devices over modern PCIe interfaces. Drivers are available for Windows and Linux, ensuring broad compatibility.
For detailed specifications, refer to the ASIX datasheet.

The AX99100 (PCIe to quad serial port chip) has several equivalents, including:
- Oxford Semiconductor OXPCIe952 (PCIe to quad UART)
- Exar XR17V354 (PCIe to quad UART)
- MCS9860 (PCIe to quad serial)
- TI TL16C754D (Quad UART, needs PCIe bridge)
These chips offer similar multi-port serial functionality, though pin compatibility and features may vary. Check datasheets for exact specs.

The AX99100 is a high-performance PCIe-to-serial bridge IC, primarily used in:
1. Industrial Automation – Connects legacy serial devices (RS-232/422/485) to modern PCIe systems.
2. Embedded Systems – Enables multi-port serial communication in compact designs.
3. Telecom & Networking – Facilitates serial console management for routers/switches.
4. Medical Equipment – Interfaces with serial-based diagnostic devices.
5. POS & Retail – Supports barcode scanners, receipt printers, etc.
Its low power, high throughput, and multi-protocol support make it ideal for upgrading legacy serial interfaces in modern systems.