ST16C550CQ48-F

ST16C550CQ48-F is STMicroelectronics’ 16C550-compatible universal asynchronous receiver/transmitter (UART) in a 48-pin CQFP package. It provides a single-channel serial interface with the classic 16C550/16550 register set and software model, enabling RS-232/RS-422/RS-485-style communication in embedded systems.
Key features
- 1 UART, 8 data bits, configurable parity and stop bits (8N1, etc.)
- Programmable baud rate via divisor latch (divisor-based baud generator)
- Interrupt-driven operation with standard UART interrupt/status registers
- Modem control/status lines (CTS, RTS, DSR, DTR, DCD/RI as supported)
- 48-pin, RoHS-compliant CQFP packaging (CQ48-F)
Why use it
- Software compatibility with 16C550/16550 serial drivers eases porting
- Flexible serial configurations for diverse interfaces
- Suitable for embedded serial ports, data acquisition, telecom equipment, and industrial controls
Notes
- Refer to the official datasheet for exact register map, timing, I/O ranges, and electrical specs for the CQ48-F variant.

Equivalent products are other 16C550/16550 UARTs from different vendors that are pin-compatible. Common drop-ins include:
- NS16550A (National Semiconductor/TI lineage)
- Intel 16550
- TL16C550 (Texas Instruments)
- SC16C550 (Exar/Silicon/related)
Ensure matching package (CQ48), voltage, and timing.

Here are the likely key features of ST16C550CQ48-F (16C550-class UART, 48-pin package):
- 1-channel UART compatible with 8250/16550
- 8 data bits with selectable parity (none, odd, even, mark, space); 1 or 2 stop bits (5-bit data allows 1.5)
- Programmable baud-rate generator via divisor latch (DLAB)
- Interrupt-driven operation with multiple sources and a programmable interrupt identification mechanism
- Typical sources: Receiver Data Available/Character Timeout, Transmitter Holding Register Empty, Receiver Line Status, Modem Status
- Modem control/signals: DTR, RTS, CTS, DSR, RI, DCD
- Optional loopback/test mode for diagnostic use
- TTL/CMOS-compatible I/O; RS-232 levels require external transceivers
- 48-pin CQFP package (CQ48)
- 4.5–5.5 V supply (typical 5 V); suitable for standard industrial temperature ranges (refer to datasheet for exact limits)
Note: For exact electrical specs, timing, and supported baud rates, consult the ST16C550CQ48-F datasheet.

- Pin count: 48 pins (CQ48 package, 48-pin QFP)
- Function: ST16C550CQ48-F is a 16C550‑compatible single‑channel UART (universal asynchronous receiver/transmitter) for serial communications, with 16550‑class registers, baud-rate divisor, and interrupt support.

- Manufacturer: STMicroelectronics (ST).
- Kind of company: A multinational electronics and semiconductor company that designs, manufactures, and sells ICs and semiconductor devices (e.g., microcontrollers, sensors, power management). It is one of the world’s largest semiconductor companies.

- Embedded systems requiring UART-based serial interfaces (RS-232/RS-422/RS-485)
- Industrial automation and control (PLCs, instrumentation)
- Networking/telecom equipment (routers, gateways, modems)
- Point-of-sale and data-collection devices
- Medical devices and laboratory instrumentation
- Test, measurement, and console/debug interfaces
Note: ST16C550CQ48-F is a UART (16C550-compatible) suitable for implementing serial ports in these environments.

It’s a 48-pin plastic Quad Flat Pack (QFP) package, RoHS-compliant lead-free (CQ48-F).