NXP Semiconductors SC16C652IB48,128

Overview

SC16C652IB48,128 from NXP Semiconductors (formerly Philips) is a dual-channel UART IC designed for high-throughput serial communication in embedded systems. It features two independent 32-byte transmit and receive FIFOs, supports data rates up to 5 Mbit/s at 5 V/3.3 V, operates across industrial temperature range (−40 °C to +85 °C), and uses an LQFP48 package. It serves as a drop-in upgrade for legacy 16C2450/SC16C2550 designs in industrial control backplanes.

For engineers reviewing the SC16C652IB48,128 datasheet, SC16C652IB48,128 pinout, SC16C652IB48,128 application, or SC16C652IB48,128 equivalent, key selection criteria include dual-channel FIFO depth, programmable baud rate generator with 16× clock division, hardware/software flow control support, DMA-ready TXRDY/RXRDY signaling, and compatibility with 5 V/3.3 V/2.5 V I/O interfaces.

Technical Context

The SC16C652IB48,128 implements two fully independent UART channels (A and B), each with dedicated 32-byte FIFOs, separate programmable baud rate generators, and individual interrupt control logic. Its register set includes standard 16C550-compatible registers plus enhanced features accessible via the Enhanced Feature Register (EFR), enabling independent TX/RX trigger level configuration and automatic RTS/CTS flow control.

It supports both internal crystal oscillator (via XTAL1/XTAL2) and external clock input modes, with baud rate generation derived from a 16× base clock divided by a 16-bit divisor (DLL/DLM). The device provides full modem control signaling (CTS, RTS, DSR, DTR, RI, CD), loop-back diagnostics, and prioritized interrupt handling with configurable maskability per channel.

Key Specifications

Pinout & Package

SC16C652IB48,128 is housed in a plastic LQFP48 package (SOT313-2), 7 mm × 7 mm × 1.4 mm body, with 0.5 mm lead pitch and exposed pad for thermal management.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SC16C652IB48,128, SC16C752IB48,118 offers deeper FIFOs and improved baud accuracy but requires firmware updates, while MAX3100EAP+ trades channel count and parallel interface for SPI integration and smaller footprint - making SC16C652IB48,128 optimal for cost-sensitive, legacy-compatible industrial bus expansion.

Availability

SC16C652IB48,128 is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, and point-of-sale terminals requiring stable component supply and long-term lifecycle support.

Supply support for SC16C652IB48,128 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 roots in Philips' semiconductor division.

The SC16C652IB48,128 belongs to NXP's legacy UART product line, engineered specifically for industrial-grade serial communication in resource-constrained embedded systems requiring reliability, voltage flexibility, and backward compatibility.

FAQ

What is the maximum supported data rate for SC16C652IB48,128 and under what conditions?

The SC16C652IB48,128 supports up to 5 Mbit/s at 5 V or 3.3 V supply, and 3 Mbit/s at 2.5 V. This assumes a 24 MHz crystal or clock input and proper signal integrity on TX/RX lines. At lower voltages, internal timing margins restrict maximum rate to maintain reliable sampling and framing. The device achieves this using a 16× oversampling clock derived from the programmable baud rate generator.

Does SC16C652IB48,128 support hardware flow control, and how is it configured?

Yes, SC16C652IB48,128 supports automatic hardware flow control via RTS/CTS signals. It is enabled by setting EFR[6] (RTS) and EFR[7] (CTS) to logic 1. When CTS goes low, transmission halts after the current character's stop bit; RTS is asserted low when the RX FIFO reaches its programmed trigger level. Configuration requires writing to the Enhanced Feature Register before accessing enhanced functions.

Is SC16C652IB48,128 pin-compatible with earlier UARTs like the 16C2450?

Yes, SC16C652IB48,128 is pin-compatible with the SC16C2550 and functionally equivalent to the 16C2450 at power-up. It retains identical pinout, register mapping, and default reset behavior, allowing direct replacement in existing PCB layouts. However, enhanced features (e.g., independent FIFO triggers) require enabling the Enhanced Feature Register (EFR) first.

How does the 32-byte FIFO in SC16C652IB48,128 improve system performance compared to 16-byte FIFO UARTs?

The 32-byte FIFO in SC16C652IB48,128 halves interrupt frequency under identical traffic loads versus 16-byte FIFO devices like the SC16C2550. This reduces CPU context-switching overhead, increases effective throughput in multi-tasking environments, and improves determinism in real-time applications such as PLC scan cycles or medical data acquisition.

Can SC16C652IB48,128 operate with both crystal and external clock sources?

Yes, SC16C652IB48,128 supports both configurations: a crystal can be connected between XTAL1 and XTAL2 (with 1 MΩ feedback resistor), or an external clock can be applied directly to XTAL1 while leaving XTAL2 open. The internal baud rate generator accepts clock inputs up to 80 MHz, enabling precise custom baud rates beyond standard tables.