SC16C654DBIB64,128

UARTs (Universal Asynchronous Receiver Transmitter) Overview

The SC16C654DBIB64,128 is a quad universal asynchronous receiver and transmitter (QUART) manufactured by NXP USA Inc. It operates at 5 V, 3.3 V, and 2.5 V with an industrial temperature range of −40 °C to +85 °C. The device supports data rates up to 5 Mbit/s at 5 V and 3.3 V, and 3 Mbit/s at 2.5 V. It features 64-byte transmit and receive FIFOs with error flags, automatic hardware or software flow control, and infrared encoder/decoder capabilities. The component is housed in an LQFP64 package (SOT314-2) and provides pin and software compatibility with industry-standard devices such as the ST16C654D.

UARTs (Universal Asynchronous Receiver Transmitter) Feature Summary

• Quad UART architecture supporting four independent serial channels
• Integrated 64-byte transmit and receive FIFOs for reduced CPU bandwidth
• Automatic hardware (RTS/CTS) and software (Xon/Xoff) flow control mechanisms
• Internal infrared encoder and decoder interface support

UARTs (Universal Asynchronous Receiver Transmitter) Applications

• High-speed modem interfaces requiring fast data processing
• Shared network environments demanding efficient multi-channel communication
• Industrial systems operating within extended temperature ranges

UARTs (Universal Asynchronous Receiver Transmitter) Procurement Notes

Verify the specific ordering suffix

UARTs (Universal Asynchronous Receiver Transmitter) Selection Notes

Select this variant when continuous interrupt enable mode is required, as the DB suffix bonds the INTSEL pin internally to VCC. Ensure the design utilizes the LQFP64 package constraints where only channel A possesses all modem pins. Confirm that the application requires quad UART functionality rather than dual or single channel alternatives.

UARTs (Universal Asynchronous Receiver Transmitter) Part Context

This component belongs to the SC16C654B/654DB family of QUART devices. It serves as an enhanced successor to legacy 16C454 and 16C554 UARTs by providing larger 64-byte FIFOs instead of 16-byte or zero-byte buffers. The device integrates both Intel-style 16 mode and Motorola-style 68 mode interface logic on a single chip.

UARTs (Universal Asynchronous Receiver Transmitter) Replacement Considerations

Public confirmed substitutes include SC16C654BIB64 and SC16C654BIBM. These variants share identical electrical specifications but differ in internal configuration, specifically regarding the INTSEL pin bonding which affects interrupt behavior.