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NXP Semiconductors SC16C754IB80,528
- Part No.:
- SC16C754IB80,528
- Manufacturer:
- NXP Semiconductors
- Package:
- 80-LQFP
- Datasheet:
-
SC16C754IB80,528.pdf
- Description:
- IC UART QUAD W/FIFO 80-LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,835
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Product details
Overview
SC16C754IB80,528 from NXP Semiconductors (formerly Philips) is a quad-channel UART IC with 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 independent UART channels in a single LQFP80 package, each with full modem control (RTS/CTS/DSR/DTR/RI/CD), programmable baud rate generation, and error detection (framing, parity, break, overflow). It is used in industrial communication gateways requiring high-density serial port expansion.
For engineers reviewing the SC16C754IB80,528 datasheet, SC16C754IB80,528 pinout, SC16C754IB80,528 application, or SC16C754IB80,528 equivalent, key selection criteria include quad-channel FIFO depth, Auto-RTS/Auto-CTS trigger level programmability via TCR register, RXRDY/TXRDY wire-ORed status outputs for DMA coordination, and compatibility with legacy SC16C554/SC16C654 designs.
Technical Context
The SC16C754IB80,528 implements a fully independent four-channel UART architecture with per-channel address decoding (A0–A2), individual chip selects (CSA–CSD), and dedicated interrupt outputs (INTA–INTD). Each channel features a 64-byte receive FIFO with three-bit error status per byte and a 64-byte transmit FIFO, both supporting programmable trigger levels via TLR and TCR registers.
Its flow control subsystem includes dual-mode operation: hardware flow control using Auto-RTS (controlled by RX FIFO halt/resume thresholds in TCR[3:0]/TCR[7:4]) and Auto-CTS (enabled via EFR[7]), plus software flow control with configurable Xon/Xoff characters (EFR[3:0]) and Xon Any functionality (MCR[5]). The baud rate generator uses a prescalable clock (CLKSEL-selectable divide-by-1 or divide-by-4) and a 16-bit divisor for precise timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Baud Rate Max | 5 Mbits/s at 3.3 V or 5 V; enables high-speed RS-232/RS-485 links without external clock multiplication. |
| FIFO Depth | 64-byte TX and RX FIFO per channel; reduces CPU interrupt load and supports burst data transfers. |
| Flow Control | Programmable Auto-RTS/Auto-CTS and software Xon/Xoff; eliminates overrun errors in asymmetric data paths. |
| Serial Format | 5–8 data bits, 1/1.5/2 stop bits, even/odd/no parity; ensures interoperability with legacy and custom protocols. |
| Interrupt System | Six prioritized interrupt levels with IIR[5:0] encoding; allows deterministic servicing of RX timeout, line errors, and modem events. |
| Power Supply | Supports 2.5 V, 3.3 V, and 5 V operation; simplifies integration into mixed-voltage industrial backplanes. |
| Crystal Input | XTAL1/XTAL2 accepts crystal or external clock up to 80 MHz; enables precise baud rate derivation across temperature. |
Pinout & Package
LQFP80 package (12 × 12 × 1.4 mm, SOT315-1), lead count: 80, body material: plastic low-profile quad flat package.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A2 | Address select inputs | Select internal register address (0–7) for 8-bit parallel bus access to all four UART channels. |
| CSA–CSD | Channel chip select (active-low) | Enable data transfer to UART A, B, C, or D independently; supports shared bus arbitration. |
| TXA–TXD / RXA–RXD | Serial transmit/receive I/O | Four independent full-duplex serial channels; each pair connects directly to RS-232 transceivers or logic-level peripherals. |
| RTSA–RTSD / CTSA–CTSD | Hardware flow control I/O | Per-channel RTS (output) and CTS (input); enable automatic data pacing when Auto-RTS/Auto-CTS enabled in EFR. |
| RXRDY / TXRDY | Wire-ORed FIFO status outputs | Active-low signals indicating any RX or TX FIFO has reached trigger level; used for DMA request signaling across all channels. |
| INTA–INTD | Per-channel interrupt outputs | Active-high interrupts for channel-specific events (e.g., RX ready, TX empty, line error); allow prioritized CPU servicing. |
| CLKSEL | Prescaler select input | Configures internal clock divider (divide-by-1 or divide-by-4) at reset; latched into MCR[7] for baud rate flexibility. |
Key Features
| Feature | Design Value |
|---|---|
| Quad-channel 64-byte FIFO | Enables simultaneous high-throughput serial communication on four ports while reducing host CPU overhead by >70% vs. 16-byte FIFO UARTs. |
| Programmable TCR trigger levels | Allows independent configuration of Auto-RTS halt/resume thresholds (0–63 bytes) per channel to match system latency and buffer management policies. |
| FIFO RDY register access | Single read of FIFO RDY register returns combined TXRDY/RXRDY status for all four channels - accelerates DMA-ready polling in real-time systems. |
| Internal loop-back mode | Enables on-board diagnostics without external cabling: TX output internally routed to RX input for functional validation during boot or maintenance. |
| Enhanced Feature Register (EFR) | Unlocks Auto-CTS/Auto-RTS, Xon/Xoff modes, and special character detection - all controlled via one 8-bit register without affecting legacy register map. |
Applications
| Industrial PLC Backplane | Medical Device Serial Hub |
|---|---|
Use Scenario: Expansion module in a programmable logic controller adds four isolated RS-485 ports for sensor/actuator communication. IC Role / Device Role / Timing Role: SC16C754IB80,528 serves as the central serial interface controller, managing protocol framing, flow control, and interrupt-driven data buffering across all four ports. Use Value: 64-byte FIFOs prevent data loss during scan-cycle jitter; Auto-RTS halts transmission when local buffer fills, eliminating overrun in deterministic motion control loops. | Use Scenario: Patient monitor aggregates data from ECG, SpO₂, and NIBP modules via separate TTL-level UART links before Ethernet upload. IC Role / Device Role / Timing Role: SC16C754IB80,528 acts as a multi-port serial concentrator, synchronizing asynchronous device streams into a unified DMA-accessible memory buffer. Use Value: RXRDY/TXRDY wire-OR outputs trigger single DMA channel for all four ports, reducing peripheral controller complexity and memory bandwidth usage. |
| Telecom Access Node | Test Equipment Control Interface |
Use Scenario: DSLAM shelf management card provides console access and out-of-band provisioning via four RS-232 debug ports. IC Role / Device Role / Timing Role: SC16C754IB80,528 functions as a quad UART bridge between ARM host processor and field-service terminals, handling login sessions and firmware updates. Use Value: Software flow control with programmable Xon/Xoff characters prevents command-line corruption during high-latency SSH sessions over slow modems. | Use Scenario: Automated test system controls multiple instruments (oscilloscope, power supply, DMM) via dedicated serial interfaces. IC Role / Device Role / Timing Role: SC16C754IB80,528 operates as a deterministic serial command dispatcher, sequencing instrument queries and parsing responses with precise timing. Use Value: Six-level prioritized interrupt system ensures time-critical trigger acknowledgments (e.g., scope edge detection) preempt lower-priority status polling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad UART applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SC16C752IB80,528 | Dual-channel version (2×64-byte FIFO); identical pinout and register set except reduced channel count and fewer INT/CS pins. | Suitable where only two high-throughput serial ports are required; saves PCB area and cost but lacks channel density. | Select SC16C752IB80,528 if system design requires exactly two UARTs and board space is constrained. |
| EXAR XR17V354IL-F | PCIe-to-quad-UART bridge with integrated PCIe endpoint; supports 12 Mbits/s, 128-byte FIFOs, and Windows/Linux drivers. | Targets PC-based test equipment or server BMCs needing plug-and-play host interface; not pin-compatible and requires PCIe infrastructure. | Choose XR17V354IL-F only when migrating from parallel-bus host interface to PCIe and driver support is mandatory. |
Compared with SC16C752IB80,528, the SC16C754IB80,528 delivers double channel count in same LQFP80 footprint for dense serial expansion; versus XR17V354IL-F, it offers direct 8-bit parallel bus integration without PCIe complexity or OS dependency.
Availability
SC16C754IB80,528 is available at Aetrix Electronics and suitable for industrial PLC backplanes, medical device serial hubs, telecom access nodes, and automated test equipment requiring stable component supply and long-term obsolescence management.
Supply support for SC16C754IB80,528 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 formed from the spin-off of Philips Semiconductors in 2006, specializing in secure connectivity solutions for automotive, industrial, and IoT markets.
The SC16C754IB80,528 belongs to NXP's legacy UART product line designed for high-reliability industrial communication systems requiring pin-compatible upgrades from SC16C554/SC16C654 and robust flow-controlled serial expansion.
FAQ
What is the maximum data rate supported by the SC16C754IB80,528?
The SC16C754IB80,528 supports a maximum data rate of 5 Mbits/s when operated at 3.3 V or 5 V supply voltage. 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 transmitter/receiver circuitry, making it suitable for demanding RS-232 and RS-485 applications where legacy UARTs fall short.
Does the SC16C754IB80,528 support hardware flow control on all four UART channels?
Yes, the SC16C754IB80,528 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[6] and EFR[7]), allowing dynamic pacing based on individual RX FIFO fill levels - a capability confirmed in the Rev. 04 datasheet section 6.2.
How does the SC16C754IB80,528 handle interrupt prioritization across its four channels?
The SC16C754IB80,528 implements a six-level prioritized interrupt system encoded in the Interrupt Identification Register (IIR[5:0]). Each UART channel contributes to this hierarchy: receiver line status (priority 1), RX time-out (priority 2), RHR ready (priority 2), THR empty (priority 3), modem status (priority 4), and Xoff detection (priority 5). This ensures critical events like framing errors or buffer overflows are serviced before lower-priority status updates.
Can the SC16C754IB80,528 operate from a 2.5 V supply?
Yes, the SC16C754IB80,528 is fully specified for 2.5 V, 3.3 V, and 5 V operation. However, at 2.5 V, the maximum supported baud rate is limited to 3 Mbits/s (versus 5 Mbits/s at higher voltages), and certain timing parameters such as bus access time increase slightly. All logic levels, register functions, and FIFO behavior remain fully operational across the entire voltage range.
What is the function of the CLKSEL pin on the SC16C754IB80,528?
The CLKSEL pin on the SC16C754IB80,528 selects the internal clock prescaler: a logic HIGH configures divide-by-1, while a logic LOW configures divide-by-4. Its state is latched into MCR[7] at the trailing edge of RESET, establishing the base clock division factor used by the baud rate generator. This allows flexible clock source scaling without modifying external crystal frequency - a feature explicitly documented in Table 2 of the datasheet.
SC16C754IB80,528 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 80-LQFP
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Features:
- -
- Number of Channels:
- 4, QUART
- FIFO's:
- 64 Byte
- Protocol:
- -
- Data Rate (Max):
- 5Mbps
- Voltage - Supply:
- 2.5V, 3.3V, 5V
- With Auto Flow Control:
- Yes
- With IrDA Encoder/Decoder:
- -
- With False Start Bit Detection:
- Yes
- With Modem Control:
- Yes
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 80-LQFP (12x12)
SC16C754IB80,528 FAQ
1.How can I place an order for SC16C754IB80,528 through Aetrix?
Please submit a Request for Quotation (RFQ) for SC16C754IB80,528 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SC16C754IB80,528 reliable?
The price and inventory of SC16C754IB80,528 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC16C754IB80,528 is usually 5 days.
3.What payment methods are accepted for SC16C754IB80,528?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC16C754IB80,528 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC16C754IB80,528?
SC16C754IB80,528 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC16C754IB80,528 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SC16C754IB80,528?
For technical support, including SC16C754IB80,528 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC16C754IB80,528 requirements.
6.How does Aetrix verify that SC16C754IB80,528 is sourced from the original manufacturer or authorized distributors?
All SC16C754IB80,528 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SC16C754IB80,528 meets industry standards.
7.What is the process for return or replacement of SC16C754IB80,528?
All SC16C754IB80,528 units undergo pre-shipment inspection (PSI). If there is an issue with SC16C754IB80,528, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SC16C754IB80,528 part is unused and in its original packaging.
Return procedure for SC16C754IB80,528:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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