TL16C550DZQSR

UARTs (Universal Asynchronous Receiver Transmitter) Overview

The TL16C550DZQSR is a single-channel asynchronous communications element (ACE) from Texas Instruments, housed in a 24-pin ZQS package. It supports 5-V, 3.3-V, and 2.5-V operation with a maximum data rate of up to 1.5 Mbaud at 5 V and up to 3 Mbaud at 3.3 V (ZQS package only). The device features 16-byte transmit and receive FIFOs with error status bits. It includes programmable auto-RTS and auto-CTS autoflow control, independent interrupts, and full modem control signals. Operating temperature range is -40°C to +85°C.

UARTs (Universal Asynchronous Receiver Transmitter) Feature Summary

• Autoflow control with programmable auto-RTS and auto-CTS to manage serial data flow and reduce software overhead.
• 16-byte transmit and receive FIFOs with integrated error status reporting for each byte.
• Supports standard asynchronous communication bits including start, stop, and parity generation or detection.
• Fully prioritized interrupt system with independent control for line status, data set, and receiver/transmitter events.

UARTs (Universal Asynchronous Receiver Transmitter) Applications

• Serial-to-parallel and parallel-to-serial conversion in embedded systems
• Communication interfaces between microprocessors and peripheral devices or modems
• Systems requiring DMA signaling via TXRDY and RXRDY outputs

UARTs (Universal Asynchronous Receiver Transmitter) Procurement Notes

Verify the specific ordering suffix ZQSR against the manufacturer's current product folder to confirm package type and availability. Ensure the procurement source provides official documentation matching the TL16C550D family specifications. Confirm that the component meets the required voltage and temperature ranges for the intended application environment before finalizing orders.

UARTs (Universal Asynchronous Receiver Transmitter) Selection Notes

Select this part when a reduced pin count solution is required compared to the 48-pin PT or PFB packages. The ZQS package eliminates certain chip select and output signals while maintaining core ACE functionality. Ensure the design accommodates the specific terminal assignments and internal connections defined for the 24-ball ZQS configuration.

UARTs (Universal Asynchronous Receiver Transmitter) Part Context

The TL16C550DZQSR belongs to the TL16C550D family, which serves as an upgrade to the TL16C550C and functional equivalent to the TL16C450. It offers speed and voltage improvements over previous generations. The ZQS variant specifically provides a compact 24-pin option for applications where space is constrained but full UART functionality is needed.

UARTs (Universal Asynchronous Receiver Transmitter) Replacement Considerations

TL16C550DIPTG4: Different package (LQFP-48), higher max clock rate support.

UARTs (Universal Asynchronous Receiver Transmitter) FAQ

What is the maximum baud rate supported by the TL16C550DZQSR?

The device supports up to 1.5 Mbaud with a 5-V supply and up to 3 Mbaud with a 3.3-V supply (specifically for the ZQS package with divisor >= 2).

How does autoflow control operate in this device?

Autoflow control uses auto-CTS to block transmission if the CTS input is inactive and auto-RTS to signal the sender when the receiver FIFO reaches a programmed trigger level, preventing overrun errors.

Does the ZQS package retain all functionalities of the larger packages?

Most functionality is retained, but signals such as CS0, CS1, ADS, DSR, RI, DCD, OUT1, OUT2, and BAUDOUT are eliminated or internally connected in the ZQS package.