NXP Semiconductors SC16C754IB80,557

Overview

SC16C754IB80,557 from NXP Semiconductors (formerly Philips) is a quad UART IC with independent 64-byte transmit and receive FIFOs, hardware/software flow control, and support for data rates up to 5 Mbits/s at 3.3 V or 5 V. It integrates four full-duplex serial channels, programmable baud rate generation, and modem control signals (RTS/CTS/DSR/DTR/RI/CD) for industrial communication systems requiring high-throughput asynchronous serial I/O.

For engineers reviewing the SC16C754IB80,557 datasheet, SC16C754IB80,557 pinout, SC16C754IB80,557 application, or SC16C754IB80,557 equivalent, key selection criteria include FIFO depth per channel, Auto-RTS/Auto-CTS trigger level programmability via TCR, RXRDY/TXRDY shared status signaling, and LQFP80 package compatibility with legacy SC16C654/SC16C554 designs.

Technical Context

The SC16C754IB80,557 implements a fully prioritized six-level interrupt system with dedicated INTA–INTD outputs per channel and shared RXRDY/TXRDY status lines. Its enhanced feature register (EFR) enables Auto-RTS and Auto-CTS independently, with halt/resume thresholds stored in the transmission control register (TCR) for precise receiver FIFO-based flow management.

It supports dual DMA modes: mode 0 (single-character transfers with FIFO disabled) and mode 1 (block transfers with FIFO enabled), both coordinated via FCR[3]. Baud rate is generated from an external clock (XTAL1/XTAL2) using a 16-bit programmable divisor plus optional prescaler (÷1 or ÷4 selected by CLKSEL).

Key Specifications

Pinout & Package

SC16C754IB80,557 is housed in an 80-pin plastic LQFP (Low-Profile Quad Flat Package) with 12 × 12 × 1.4 mm body (SOT315-1). Pin functions are validated per Philips Rev. 04 datasheet Figure 2 and Table 2.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SC16C754IA68, SC16C754IB80,557 offers superior thermal performance and PCB routing density in LQFP80, while TL16C754BIPM extends environmental robustness and adds low-power features - neither is pin-compatible with SC16C754IB80,557 due to differing package footprints and voltage specifications.

Availability

SC16C754IB80,557 is available at Aetrix Electronics and suitable for industrial PLC communication, POS terminal serial expansion, medical device data logging, and legacy equipment interface adapter applications requiring stable component supply and long-term obsolescence management.

Supply support for SC16C754IB80,557 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 SC16C754IB80,557 belongs to NXP's legacy industrial UART product line, engineered for high-reliability serial communication in factory automation, point-of-sale, and medical instrumentation where deterministic latency and error resilience are critical.

FAQ

What is the maximum data rate supported by the SC16C754IB80,557?

The SC16C754IB80,557 supports a maximum data rate of 5 Mbits/s when operated at 3.3 V or 5 V supply voltages. At 2.5 V, the maximum achievable baud rate is reduced to 3 Mbits/s. This performance is enabled by its high-speed internal logic and optimized FIFO architecture, making SC16C754IB80,557 suitable for demanding industrial serial applications such as high-speed barcode scanning or real-time sensor aggregation.

Does the SC16C754IB80,557 support hardware flow control on all four UART channels?

Yes, the SC16C754IB80,557 supports independent hardware flow control on all four UART channels via dedicated RTS and CTS pins (RTSA–RTSD and CTSA–CTSD). Auto-RTS and Auto-CTS functions are enabled per channel through the Enhanced Feature Register (EFR), allowing dynamic transmitter pacing based on receiver FIFO occupancy - a capability confirmed in the SC16C754IB80,557 datasheet Section 6.2.

How does the SC16C754IB80,557 handle interrupt prioritization across its four UART channels?

The SC16C754IB80,557 implements a fully prioritized six-level interrupt system with individual INTA–INTD outputs per channel and shared RXRDY/TXRDY status lines. Interrupt sources - including receiver errors, FIFO trigger events, and modem status changes - are ranked by priority level (1 to 6), ensuring time-critical conditions like framing errors are serviced before lower-priority events. This architecture is documented in Table 6 of the SC16C754IB80,557 datasheet.

Can the SC16C754IB80,557 operate with a 2.5 V supply voltage?

Yes, the SC16C754IB80,557 is specified to operate over a 2.5 V to 5.5 V supply range. At 2.5 V, its maximum baud rate is limited to 3 Mbits/s, and certain timing parameters (e.g., bus access time) are relaxed relative to 3.3 V/5 V operation. This multi-voltage capability allows SC16C754IB80,557 to interface directly with mixed-signal SoCs and low-power microcontrollers without level-shifting circuitry.

What package type is used for the SC16C754IB80,557 and how many pins does it have?

The SC16C754IB80,557 uses an 80-pin plastic LQFP (Low-Profile Quad Flat Package) with 12 × 12 × 1.4 mm body dimensions (SOT315-1). This surface-mount package provides thermal and electrical performance advantages over the PLCC68 variant and is pin-compatible with earlier SC16C654/SC16C554 designs when implemented in LQFP80 footprint - a detail confirmed in the SC16C754IB80,557 ordering information table.