NXP Semiconductors SC16IS750IBS,151

Overview

SC16IS750IBS,151 from NXP Semiconductors is a single-channel UART IC with I²C-bus or SPI slave interface, 64-byte TX/RX FIFOs, IrDA SIR support up to 115.2 kbit/s, and eight programmable GPIOs. It operates at 2.5 V or 3.3 V, supports auto RTS/CTS hardware flow control, and targets RS-232/RS-485 protocol bridging in space-constrained industrial systems.

For engineers reviewing the SC16IS750IBS,151 datasheet, SC16IS750IBS,151 pinout, SC16IS750IBS,151 application, or SC16IS750IBS,151 equivalent, key selection criteria include its HVQFN24 package footprint, 4 Mbit/s SPI clock limit, 5 Mbit/s UART baud rate, sleep current <30 µA, and register compatibility with legacy 16C450 firmware.

Technical Context

The SC16IS750IBS,151 integrates a full-duplex UART core with dual-mode serial host interface (I²C-bus up to 400 kbit/s or SPI up to 4 Mbit/s), independent TX/RX FIFO trigger level programming via TLR register, and automatic RS-485 driver direction control using RTS signal polarity inversion. Its internal oscillator supports crystal (XTAL1/XTAL2) or external clock input.

Hardware flow control is implemented through EFR[7:6]-configured auto RTS and auto CTS, where RTS activation depends on RX FIFO level versus TCR-defined halt/resume thresholds, and CTS deassertion halts transmission mid-character if timed before the last stop bit's midpoint - eliminating overrun errors without host intervention.

Key Specifications

Pinout & Package

HVQFN24 package (SOT616-3), 4 mm × 4 mm × 0.85 mm body, exposed thermal pad requiring PCB ground connection for thermal and electrical performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SC16IS750IBS,151, SC16IS760IBS adds higher-speed interfaces but increases cost and power; SC16IS750IPW trades miniaturization for assembly flexibility - both retain full software compatibility and UART feature parity.

Availability

SC16IS750IBS,151 is available at Aetrix Electronics and suitable for factory automation, portable data terminals, and cellular IoT gateways requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for SC16IS750IBS,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 leader focused on secure connectivity solutions for automotive, industrial, and IoT applications, with deep expertise in interface and mixed-signal IC design.

The SC16IS750IBS,151 belongs to NXP's SC16IS7xx UART bridge family, engineered specifically to simplify protocol conversion between microcontroller buses (I²C/SPI) and legacy serial standards (RS-232/RS-485/IrDA) in resource-constrained systems.

FAQ

What interface modes does the SC16IS750IBS,151 support?

The SC16IS750IBS,151 supports two mutually exclusive host interface modes: I²C-bus (slave-only, up to 400 kbit/s) and SPI (slave-only, Mode 0, up to 4 Mbit/s). Selection is controlled by the logic level on the I2C/SPI pin - high for I²C, low for SPI. Pin functions like SDA, SO, SI, and SCLK are dynamically reassigned based on this setting, and the device does not support simultaneous or auto-switching between modes.

Does the SC16IS750IBS,151 require an external crystal?

The SC16IS750IBS,151 can operate with either a 1–25 MHz crystal connected between XTAL1 and XTAL2, or an external clock applied to XTAL1 with XTAL2 left unconnected. The internal oscillator circuit is enabled automatically when a crystal is detected; no configuration register setting is needed. Crystal start-up time varies with load capacitance and VCC ramp rate, typically requiring several milliseconds before stable UART operation begins.

How many GPIOs does the SC16IS750IBS,151 provide?

The SC16IS750IBS,151 provides eight programmable GPIO pins (GPIO0–GPIO7), each configurable as input or output via the IO Direction register. Four of these (GPIO4–GPIO7) double as modem control signals (DSR/DTR/CD/RI) and can be mapped to alternate functions using the IO Control register. All GPIOs support interrupt-on-change capability and have internal weak pull-ups enabled by default.

What is the maximum UART baud rate supported by the SC16IS750IBS,151?

The SC16IS750IBS,151 supports UART baud rates up to 5 Mbit/s when operating in 16× sampling mode. This maximum is achievable only with a sufficiently high input clock (e.g., ≥80 MHz crystal or external clock), as the baud rate generator divides the reference clock by a 16-bit divisor. At lower clock frequencies, the practical maximum baud rate decreases proportionally - for example, with a 16 MHz crystal, the highest reliable rate is ~1 Mbit/s.

Is the SC16IS750IBS,151 pin-compatible with the SC16IS740 or SC16IS760?

The SC16IS750IBS,151 shares identical pinout and package dimensions with the SC16IS760IBS in HVQFN24, making them mechanically and electrically interchangeable. However, it is not pin-compatible with the SC16IS740, which uses a 16-pin TSSOP package and lacks GPIO pins. While SC16IS750IBS,151 and SC16IS760IBS share the same pin map, their SPI clock and IrDA SIR speed capabilities differ - verify interface timing requirements before substitution.