NXP Semiconductors SC16C750BIBS,151

Overview

SC16C750BIBS,151 from NXP Semiconductors is a single-channel 5 V/3.3 V/2.5 V UART IC with 64-byte transmit and receive FIFOs, programmable auto-RTS/CTS hardware flow control, and support for serial data rates up to 3 Mbit/s at 5 V. It operates across the industrial temperature range (−40 °C to +85 °C) and is packaged in HVQFN32 for space-constrained embedded serial interfaces in industrial controllers and communication gateways.

For engineers reviewing the SC16C750BIBS,151 datasheet, SC16C750BIBS,151 pinout, SC16C750BIBS,151 application, or SC16C750BIBS,151 equivalent, key selection criteria include FIFO trigger level configurability, DMA-ready TXRDY/RXRDY signaling, sleep mode power management, and compatibility with legacy 16C450 software stacks in resource-limited microcontroller systems.

Technical Context

The SC16C750BIBS,151 implements a fully programmable asynchronous serial interface with independent transmitter and receiver clock domains (RCLK input supported), 16× oversampling for reliable start-bit detection, and a baud rate generator accepting up to 48 MHz input clock. Its register set mirrors the industry-standard 16C450 upon reset but extends functionality via FCR, MCR, and LCR bits enabling 64-byte FIFO operation and automatic flow control logic.

Hardware flow control is implemented through dedicated CTS (input) and RTS (output) pins, with auto-CTS suspending transmission on CTS deassertion and auto-RTS toggling RTS based on receive FIFO fill level against four selectable thresholds (1/16/32/56 bytes). Internal loopback mode isolates TX/RX path integrity without external cabling, and sleep mode disables the oscillator while retaining interrupt wake capability on RX edge or modem pin transitions.

Key Specifications

Pinout & Package

HVQFN32 package: 5 mm × 5 mm × 0.85 mm body, 32-terminal no-lead thermal-enhanced quad flat layout with exposed thermal pad (pin 32 = GND).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar UART applications.

Compared with TL16C750CPTR, SC16C750BIBS,151 offers broader voltage support and smaller footprint; compared with SC16C752BIBS,151, it delivers lower cost and power for single-link applications where channel count is fixed.

Availability

SC16C750BIBS,151 is available at Aetrix Electronics and suitable for industrial PLC gateways, medical RS-232 interfaces, telecom modem subsystems, and automotive telematics control units requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SC16C750BIBS,151 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

NXP Semiconductors is a global semiconductor company specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with leadership in interface, RF, and microcontroller technologies.

The SC16C750BIBS,151 belongs to NXP's legacy UART product line designed for robust, low-power serial communication in harsh industrial and transportation environments where software compatibility and long-term supply stability are critical.

FAQ

What voltage levels does the SC16C750BIBS,151 support, and how does that affect system design?

The SC16C750BIBS,151 supports 2.5 V, 3.3 V, and 5 V supply voltages with ±10 % tolerance. This triple-voltage capability allows direct integration into mixed-voltage systems without external level shifters-reducing BOM cost and board area. Input pins D7–D0 are 5 V tolerant, enabling safe connection to legacy 5 V microcontrollers even when the SC16C750BIBS,151 operates at 3.3 V or 2.5 V.

How does the 64-byte FIFO in the SC16C750BIBS,151 improve system performance compared to older UARTs?

The 64-byte transmit and receive FIFOs in the SC16C750BIBS,151 reduce CPU interrupt frequency by up to 64× versus the 1-byte buffer of basic 16C450 UARTs. In burst-data applications like sensor aggregation or modem handshaking, this lowers processor load, improves deterministic response times, and enables deeper power-saving states between serial transactions-directly measurable as reduced average current draw in SC16C750BIBS,151-based designs.

Can the SC16C750BIBS,151 be used with existing 16C450 software drivers?

Yes-the SC16C750BIBS,151 powers up in 16C450-compatible mode with identical register initialization and default behavior. All standard 16C450 driver stacks operate without modification. Enhanced features (64-byte FIFOs, auto-flow control) are enabled only after explicit register writes to FCR and MCR, ensuring full backward compatibility while allowing incremental feature adoption.

What is the purpose of the TXRDY and RXRDY pins on the SC16C750BIBS,151, and how are they used?

TXRDY and RXRDY are active-low DMA-ready signals on the SC16C750BIBS,151. TXRDY asserts when the transmit FIFO has space available; RXRDY asserts when the receive FIFO contains data meeting the programmed trigger level. Both support two DMA modes (single- or multi-transfer) selected via FCR[3], enabling efficient zero-wait-state data movement between UART and memory without CPU intervention-critical for high-throughput applications like firmware updates or log streaming.

Does the SC16C750BIBS,151 support crystal oscillator or external clock input, and what are the limits?

The SC16C750BIBS,151 supports both configurations: a parallel-resonant crystal (1.8432 MHz to 48 MHz) connected between XTAL1 and XTAL2, or an external clock applied to XTAL1 only (XTAL2 left floating). The maximum input clock frequency is 48 MHz, enabling baud rates up to 3 Mbit/s at 5 V. BAUDOUT provides a buffered 16× baud rate output for synchronizing external receivers or clocking companion devices.