TL16C450FN

TL16C450FN is Texas Instruments’ single-channel UART in the 16C550 family. It provides a programmable UART interface between a microprocessor and a serial link (RS-232, RS-422, or TTL-level with appropriate transceivers). It handles asynchronous serial framing (start/data/parity/stop bits), and baud-rate generation via divisor registers, with interrupt-driven data transfer.
Key features:
- 8 data bits, optional parity, 1 or 2 stop bits
- Programmable baud rate via divisor latch registers
- Read/write data and status/control registers
- Interrupt support and modem control lines (CTS/RTS/DCD/DSR/DTR/RI)
The FN suffix indicates a specific package variant. Typical use is to add a serial port to an embedded MCU or CPU, often as a replacement for older UARTs like the 8250/16C450, with external line drivers for the physical serial interface. Always consult the datasheet for exact register map and pinout.

TL16C450FN is TI’s implementation of the 16C450/16550-class UART. Equivalents include:
- 8250-compatible UARTs
- 16550/16550D
- 16C550/16C550A
- Cross-refs: SC16C550 (Philips/NXP), ST16C550 (STMicroelectronics), TL16C550 (TI)

Key features of TL16C450FN:
- Single-channel asynchronous UART
- 8 data bits, optional parity (even/odd/none), 1 or 2 stop bits
- Programmable baud rate via divisor latch (baud rate generator)
- 8250-compatible serial interface (RBR/THR, IER, IIR, LSR, MSR)
- Interrupt-driven operation (RX ready, TX ready, line-status)
- No FIFO (single-character buffer; no 16C550-style FIFO)
- Internal shift register with break, framing, parity, and overrun error detection
- 5V operation; TTL/CMOS-compatible I/O
- Software-compatible with 8250/16450/16550 UARTs
Note: For exact electrical specs and timing, refer to the TL16C450FN datasheet.

- Pin count: 40 pins (40-pin package such as DIP40/SOIC40/PLCC40).
- Function: TL16C450FN is a 16C550‑type universal asynchronous receiver/transmitter (UART) with 16‑byte transmit and receive FIFOs, providing RS-232/serial data communication with standard modem control lines and interrupt support.

- Manufacturer: Texas Instruments Incorporated (TI).
- What kind of company: An American multinational technology company that designs and manufactures semiconductors and related components (analog, mixed-signal, and embedded processing devices) and provides development tools and software.

TL16C450FN is a single-channel UART. Common application areas include:
- Embedded systems needing a dedicated serial I/O interface
- Industrial automation/control (PLC, motor drives, CNC)
- Telecom/network gear (modems, routers, multiplexers)
- Point-of-Sale terminals, printers, cash registers
- Instrumentation, test/measurement, data acquisition
- Microcontroller peripherals and PC host interfaces (RS-232/RS-422/RS-485)

28-pin plastic DIP (PDIP) package.