ST16C550CQ48TR-F

ST16C550CQ48TR-F is STMicroelectronics’ 16C550-class UART (universal asynchronous receiver/transmitter). It provides a single-channel, serial interface that is software-compatible with the 8250/16450/16550 family.
Key points
- Serial interface: 8 data bits with selectable parity, 1 or 2 stop bits; baud-rate generator for flexible speeds.
- FIFO: TX and RX buffering (enhances throughput and reduces CPU interrupts; size specified in the datasheet).
- Interrupts: supports RX, TX, line status, and modem status interrupts with masking.
- Modem control: RTS/CTS, DTR/DSR, RI, DCD for hardware flow control and signal monitoring.
- Compatibility: designed to be drop-in compatible with existing 16C550/16550 software registers and bit fields.
- Package: 48-pin package (CQ48) in lead-free (TR-F) tape-and-reel form for production use.
- Applications: embedded systems, industrial controllers, communications peripherals, and any system needing a robust, UART-based serial link.
Note: For exact electrical specs (supply voltage, timing, FIFO sizes, address map), consult the ST16C550CQ48TR-F datasheet.

Equivalent 16C550-compatible UARTs from other vendors include:
- NS16550D/16550A (National Semiconductor)
- TI TL16C550 (and TL16C550-Q1 automotive)
- SMSC SC16C550 (and SC16C550C)
- NEC μPD16550 / uPD16550
These are functionally compatible with the ST16C550 family. Note: verify voltage, timing, and pinout for packaging (CQ48TR-F is a 48-pin QFP/lead-free reel).

Here are the key features of ST16C550CQ48TR-F (UART):
- 1-channel universal asynchronous receiver/transmitter (UART) compatible with 8250/16450/16550 interfaces
- Data formats: 5/6/7/8 data bits; 1 or 2 stop bits; parity: none/odd/even/mark/space
- Programmable baud rate via divisor-latch (DLAB) with a programmable clock source
- Interrupt-driven data path with four sources: Receiver Data Available/Timeout, Transmitter Holding Register Empty, Receiver Line Status, Modem Status; supports interrupt identification
- Modem control and handshake signals: RTS/CTS, DTR/DSR and related modem status
- Registers: IER, LCR, MCR, LSR, MSR, IIR, plus divisor-latch access for baud rate
- No FIFO (1-byte receive buffer and 1-byte transmit holding register)
- 48-pin LQFP package; RoHS-compliant
- Suitable for embedded and PC-style serial interfaces
Note: for exact supply voltage range and temperature range, consult the datasheet.

- Pin count: 48 pins (CQ48 package, TR-F indicates tape & reel RoHS variant)
- Function: Single-channel universal asynchronous receiver/transmitter (UART) compatible with the 16C550/16550 family, providing TX/RX data paths, UART control/status registers, and a programmable baud-rate generator for a PC-style serial port.

- Manufacturer: STMicroelectronics (ST).
- What kind of company: A global, Franco-Italian multinational public semiconductor company that designs and manufactures a broad range of ICs and discrete components for automotive, industrial, consumer electronics, and communications.

ST16C550CQ48TR-F is a 16C550-compatible UART. Common application areas include:
- Serial interfaces in embedded systems and microcontrollers
- Industrial automation and process control (RS-232/RS-485 ports)
- Networking/telecom gear requiring reliable serial consoles
- Point-of-sale terminals, kiosks, printers and other serial peripherals
- Data acquisition, instrumentation and test equipment with serial sensors
- Development boards, PC add-on cards and SBCs needing a robust UART
These use cases leverage its standard UART functionality for asynchronous serial communication.

It’s in a 48-pin plastic Quad Flat Package (QFP/LQFP), RoHS-compliant, supplied in Tape & Reel (TR).