SC26C92A1A Dual-Channel Asynchronous Communication Controller (DUART) Specifications, Features and Typical Applications
Product Introduction
The SC26C92A1A is a dual-channel asynchronous communication controller (DUART) launched by NXP (formerly Philips Semiconductor), which is widely used in industrial control systems that require multi-serial port expansion, complex interrupt handling, and modem support. This chip is capable of expanding the data parallel bus of the main controller into two independent UART channels and supports multiple baud rates, character formats and interrupt mechanisms. This device performs well in industrial-grade applications, especially suitable for environments that require parallel port to serial port conversion and multi-tasking serial device control, such as industrial instruments, POS terminals, network communication equipment, etc.
Core parameter specification
Project Parameter description
Model SC26C92A1A
Number of channels 2 (independent UART asynchronous channel)
The data bus interface is an 8-bit parallel data bus with address decoding support
The baud rate generator is programmable and supports multiple rates
The data format supports 5/6/7/8 data bits and 1/1.5/2 stop bits
Parity check supports even check, odd check and no check
Interrupt control: Multi-source interrupt output, independent channel support
Analog modem interfaces RTS, CTS, DTR, DSR, DCD, RI (per channel)
Each channel of the FIFO buffer is equipped with a 16-byte transceiver FIFO
Package types: 44-pin PLCC, TQFP, etc
The working voltage is 5V ±10%
Operating temperature: -40°C to +85°C (industrial grade)
Product functional characteristics
🧩 Dual-serial asynchronous communication controller: Each channel is independent and suitable for multitasking scenarios
🧠 Programmable Baud rate generator: Supports standard baud rates such as 9600/38400/115200
🧮 16-byte FIFO: Receive and send buffering to prevent packet loss or blocking
🔌 Modem control support: Complete hardware handshake signal support (RTS, CTS, etc.)
📦 supports 5 to 8 bits of data, configurable check/stop bits
🧱 Parallel interface communication: Compatible with CPU/MCU bus, simplifying multi-serial port system design
Typical application circuits and access methods
SC26C92A1A is often connected to the main control MCU/CPU through a parallel port, as shown in the following figure: markdown ┌ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ┐ │ MCU │ │ (8-bit bus) │ └ ─ ─ ─ ─ ┬ ─ ─ ─ ─ ─ ─ ─ ─ ┘ │ ▼ ┌ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ┐ │ SC26C92A1A │ │ ────── ──┬────── ─── not │ │ │ CH1 │ CH2 │ │ │ │UART │UART │ │ │ └────── ────── ───┘ │ │ RTS/CTS/TxD/RxD │ └ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ┘ ▲ ▲ │ │ ───┴── not ───┴── not Serial Port Device 1 | Serial Port Device 2 | └────── ─┘ └────── ─┘
Applicable scenarios and application fields
Application direction description
🏭 Industrial automation systems control multiple serial port sensor or actuator devices
🖨️ POS and print device management dual serial port print head and data transceiver system
Youdaoplaceholder0 Router/switch serial port debug channel extension
📟 Serial terminal for old-fashioned serial terminal or serial console
🚅 Main control interface of multi-node serial port communication for rail transit communication system
Compatible and alternative model recommendations
Model and brand description
SC28L92A1A is a low-power upgraded version of NXP SC26C92
XR88C92 ExAR-compatible dual-channel asynchronous communication controller
The Z80C92 Zilog has similar functions, but the timing is different
The PC16552D TI (old model) dual-channel UART expansion has similar functions
Package instructions and ordering information
Model package type description SC26C92A1A PLCC-44 commercial or industrial standard model SC26C92A1A/AE TQFP-44 alternative package version
Summary
The SC26C92A1A is a maturely designed and widely applied dual-serial port asynchronous communication controller, particularly suitable for systems that require multi-serial port expansion, complex interrupt handling, and modem control signals. Its excellent compatibility and flexible configuration capabilities make it still have extremely high application value in industrial and embedded communication scenarios.
