NXP Semiconductors SC16C652BIB48,128

Overview

SC16C652BIB48 from NXP Semiconductors (formerly Philips) is a dual-channel UART IC designed for high-speed serial data communication in embedded industrial and telecom systems. It supports up to 5 Mbit/s data rates at 5 V/3.3 V, features independent 32-byte transmit/receive FIFOs per channel, integrated IrDA 1.0 encoder/decoder, and operates across −40 °C to +85 °C.

For engineers reviewing the SC16C652BIB48 datasheet, SC16C652BIB48 pinout, SC16C652BIB48 application, or SC16C652BIB48 equivalent, key selection considerations include dual-channel asynchronous framing with programmable baud rate generators, hardware/software flow control support, DMA-ready TXRDY/RXRDY signaling, and LQFP48 package compatibility with legacy 16C2450 designs.

Technical Context

The SC16C652BIB48 implements two independent UART channels (A and B), each with dedicated 32-byte FIFOs, separate programmable baud rate generators, and full modem control logic (CTS/RTS/DSR/DTR/RI/CD). Its register set includes enhanced feature registers (EFR), Xon/Xoff character comparators, and configurable interrupt priority handling.

It supports both internal crystal oscillator (via XTAL1/XTAL2) and external clock input modes, delivers false start-bit detection and line-break generation/detection, and enables local loop-back diagnostics via MCR-controlled internal signal routing-without affecting external pin states.

Key Specifications

Pinout & Package

SC16C652BIB48 is housed in a plastic LQFP48 package (7 × 7 × 1.4 mm, SOT313-2) with exposed pad for thermal enhancement. All pins are TTL-compatible and support 3-state bus driving.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SC16C652BIB48, SC16C652BIBS offers identical functionality in a smaller footprint but omits four modem control pins, while TL16C752BPTR provides comparable FIFO and speed performance in a 3.3 V-only domain without infrared capability - requiring layout and driver changes.

Availability

SC16C652BIB48 is available at Aetrix Electronics and suitable for industrial HMI terminals, telecom modem interfaces, medical data loggers, and POS peripheral hubs requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SC16C652BIB48 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 SC16C652BIB48 belongs to NXP's legacy UART product line, engineered for robust serial communication in harsh industrial environments where interoperability with 16C2450/16C2550 firmware and hardware is essential.

FAQ

What voltage levels does SC16C652BIB48 support, and are its inputs 5 V tolerant?

SC16C652BIB48 operates at 2.5 V, 3.3 V, and 5 V supply voltages, and all digital inputs-including D0–D7, A0–A2, CSA, CSB, IOR, IOW, and RESET-are 5 V tolerant. This allows direct interfacing with legacy 5 V microcontrollers and peripherals without level-shifting circuitry, simplifying system integration in mixed-voltage designs.

How does the FIFO trigger level configuration work in SC16C652BIB48, and what values are available?

SC16C652BIB48 provides four selectable receive and transmit FIFO trigger levels: 8, 16, 24, or 28 bytes. These are programmed via bits FCR[7:6] (RX) and FCR[5:4] (TX) in the FIFO Control Register. The default after reset is 16 bytes for both, maintaining backward compatibility with SC16C2550. Trigger levels directly determine interrupt activation points and DMA readiness timing.

Does SC16C652BIB48 support IrDA communication, and what version and data rate does it implement?

Yes, SC16C652BIB48 integrates a fully compliant IrDA 1.0 encoder/decoder supporting data rates up to 115.2 kbit/s. It handles pulse shaping, encoding (RZI), and decoding internally, eliminating the need for external IR transceiver components. The IrDA interface shares the same TXA/RXA and TXB/RXB pins, selected via internal register configuration.

Is SC16C652BIB48 pin-compatible with older UARTs like the 16C2450, and what does that mean for firmware?

SC16C652BIB48 is pin-compatible with the 16C2450 in the LQFP48 package and powers up in a functionally equivalent state. Firmware written for the 16C2450 will run unchanged on SC16C652BIB48 for basic UART operations. Enhanced features (FIFOs, IrDA, EFR) require explicit register initialization but do not break legacy compatibility.

What clock frequencies can be used with SC16C652BIB48 to achieve its maximum 5 Mbit/s data rate?

To achieve the maximum 5 Mbit/s data rate, SC16C652BIB48 requires an 80 MHz input clock applied to XTAL1 (with XTAL2 left open). With a standard 1.8432 MHz crystal, the highest supported rate is 115.2 kbit/s. Custom divisors in DLL/DLM registers allow precise baud rate synthesis across the full DC–5 Mbit/s range when using appropriate clock sources.