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NXP Semiconductors SC16C754BIB80,551
- Part No.:
- SC16C754BIB80,551
- Manufacturer:
- NXP Semiconductors
- Package:
- 80-LQFP
- Datasheet:
-
SC16C754BIB80,551.pdf
- Description:
- IC UART QUAD 64BYTE 80LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,277
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Product details
Overview
SC16C754BIB80 from NXP Semiconductors is a quad UART IC with 64-byte transmit/receive FIFOs, hardware/software flow control, and up to 5 Mbit/s data rate at 3.3 V or 5 V. It serves as a high-density serial interface controller in industrial communication gateways, embedded controllers, and multi-port terminal servers-supporting four independent RS-232/RS-485 channels via parallel bus interfacing.
For engineers reviewing the SC16C754BIB80 datasheet, SC16C754BIB80 pinout, SC16C754BIB80 application, or SC16C754BIB80 equivalent, key selection considerations include its LQFP80 package with 80 leads, programmable FIFO trigger levels for DMA coordination, 2.5–5 V supply flexibility, auto-RTS/CTS flow control logic, and compatibility with TL16C754-based legacy designs.
Technical Context
The SC16C754BIB80 implements four independent UART channels sharing a common 8-bit parallel bus (D0–D7), address decoding (A0–A2), and chip-select lines (CSA–CSD). Each channel features dedicated modem control signals (RTS/CTS/DSR/DTR/RI/CD) and individual interrupt outputs (INTA–INTD), with priority-encoded interrupt handling across six levels.
It integrates a prescalable baud rate generator (CLKSEL-selectable divide-by-1 or divide-by-4), Transmission Control Register (TCR) for per-channel RX FIFO halt/resume thresholds, and FIFO Ready (FIFO Rdy) register enabling single-cycle status read of all TXRDY/RXRDY flags. Internal loopback mode supports on-board diagnostics without external wiring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 4 independent UARTs with full modem control (RTS/CTS/DSR/DTR/RI/CD) |
| Max Data Rate | 5 Mbit/s at 3.3 V or 5 V; 3 Mbit/s at 2.5 V - enables high-speed serial bridging in industrial PLCs |
| FIFO Depth | 64-byte TX and RX FIFOs with error flags - reduces CPU interrupt load by >90% vs. 16-byte FIFO UARTs |
| Supply Voltage | 2.5 V, 3.3 V, and 5 V operation - supports mixed-voltage system integration without level shifters |
| Operating Temp | −40 °C to +85 °C - qualified for industrial automation and outdoor telecom equipment |
| Interface Bus | 8-bit parallel CPU bus with IOR/IOW strobes and A0–A2 address lines - compatible with 8051, ARM7, and FPGA host controllers |
| Flow Control | Programmable Xon/Xoff characters + auto-RTS/CTS with TCR-configurable trigger thresholds - eliminates RX FIFO overrun in bursty traffic |
Pinout & Package
LQFP80 package: plastic low-profile quad flat package, 80 leads, body size 12 × 12 × 1.4 mm (SOT315-1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D0–D7 | 8-bit bidirectional data bus | Transfers register reads/writes between host CPU and UART internal registers |
| A0–A2 | Address select inputs | Selects one of eight internal register addresses per UART channel |
| CSA–CSD | Channel-select chip enables | Activates UART A, B, C, or D independently for shared bus arbitration |
| IOR / IOW | Read/write strobes | Controls direction and timing of data transfer on D0–D7 bus |
| TXA–TXD | Serial transmit outputs | Drive RS-232/RS-485 line drivers for four independent serial ports |
| RXA–RXD | Serial receive inputs | Accept asynchronous serial data from external modems or peripherals |
| RTSA–RTSD | Request-to-Send outputs | Auto-controlled RTS signals indicating RX FIFO readiness per channel |
| CTSA–CTSD | Clear-to-Send inputs | Hardware flow control inputs that gate TX activity when deasserted |
| INTA–INTD | Individual channel interrupts | Active-HIGH prioritized interrupts for error, FIFO, or modem status events |
| TXRDY / RXRDY | Global FIFO ready flags | Wire-ORed active-LOW signals indicating space/data availability across all 4 channels |
| CLKSEL | Clock prescaler select | Configures baud generator to divide input clock by 1 or 4 - sets maximum achievable bit rate |
| INTSEL | Interrupt output control | Overrides MCR[3] to force continuous INTA–INTD assertion or enable 3-state behavior |
Key Features
| Feature | Design Value |
|---|---|
| Quad UART with 64-byte FIFOs | Enables simultaneous high-throughput serial communication across four ports without CPU polling overhead |
| Programmable auto-RTS/CTS | Eliminates RX FIFO overflow by dynamically asserting RTS based on configurable RX FIFO fill thresholds |
| Single-cycle FIFO status access | FIFO Rdy register delivers combined TXRDY/RXRDY state for all four channels in one bus read - accelerates DMA scheduling |
| Software flow control with dual Xon/Xoff pairs | Supports robust protocol negotiation using Xon1/Xon2 and Xoff1/Xoff2 - prevents false resume on corrupted control characters |
| Internal loopback mode | Permits full functional self-test of transmitter/receiver paths without external cabling or loopback adapters |
| 5 V-tolerant data bus inputs | Allows direct connection to 5 V microcontrollers while operating at 3.3 V or 2.5 V - simplifies mixed-voltage board design |
Applications
| Industrial PLC Communication Module | Multi-Port Terminal Server |
|---|---|
Use Scenario: Serial interface expansion in programmable logic controllers connecting to HMI panels, sensors, and motor drives over RS-485. IC Role / Device Role / Timing Role: Quad UART bridges fieldbus protocols to the PLC's internal 8-bit bus, managing four concurrent Modbus RTU links. Use Value: 64-byte FIFOs and auto-RTS prevent data loss during scan cycle jitter; 2.5–5 V operation matches diverse sensor voltage rails. |
Use Scenario: Centralized serial console management for network switches, routers, and firewalls in data centers. IC Role / Device Role / Timing Role: Host-side UART aggregator providing four isolated RS-232 ports controlled via single CPU bus interface. Use Value: TXRDY/RXRDY global flags simplify Linux tty driver DMA handling; software flow control ensures reliable CLI session handshaking. |
| Embedded Gateway for Legacy Equipment | Medical Device Serial Interface Card |
Use Scenario: Protocol translation gateway connecting legacy lab instruments (GPIB, RS-232) to Ethernet or USB networks. IC Role / Device Role / Timing Role: Quad UART handles simultaneous instrument command/response streams with precise timing via programmable baud divisors. Use Value: Pin compatibility with TL16C754 enables drop-in upgrade of aging designs; internal loopback supports automated factory calibration. |
Use Scenario: Patient monitor interface card acquiring data from ECG, SpO₂, and NIBP modules via isolated RS-232 links. IC Role / Device Role / Timing Role: Isolated UART hub routing time-critical biometric data to main processor with deterministic latency. Use Value: −40 °C to +85 °C rating ensures reliability in sterilization cycles; framing/break error detection maintains data integrity under EMI stress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad UART applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL16C754IPM | Same 4-channel architecture and LQFP80 footprint, but lacks TCR register, FIFO Rdy register, and auto-RTS/CTS enhancements | Lower-cost option where bursty traffic and DMA coordination are not required | Choose TL16C754IPM only if legacy software compatibility is critical and advanced flow control is unused |
| SC16C754BIBM | Identical electrical specs and register set, but in LQFP64 (64-pin) package with internal CLKSEL/GND tie-off and no INTSEL/TXRDY/RXRDY pins | Suitable for space-constrained PCBs where 80-pin routing is impractical | Select SC16C754BIBM when board area is limited and global FIFO status signaling is handled in software |
Compared with TL16C754IPM and SC16C754BIBM, the SC16C754BIB80 uniquely delivers wire-ORed TXRDY/RXRDY signaling and TCR-programmable auto-RTS thresholds - essential for real-time industrial systems requiring zero-loss serial throughput under variable load.
Availability
SC16C754BIB80 is available at Aetrix Electronics and suitable for industrial PLC communication modules, multi-port terminal servers, embedded protocol gateways, and medical device interface cards requiring stable component supply and long-term lifecycle support.
Supply support for SC16C754BIB80 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 specializing in secure connectivity solutions for automotive, industrial, and IoT applications.
The SC16C754BIB80 belongs to NXP's legacy industrial UART product line, designed specifically for high-reliability serial communication in harsh environments with extended temperature range and robust ESD immunity.
FAQ
What is the maximum data rate supported by the SC16C754BIB80?
The SC16C754BIB80 supports up to 5 Mbit/s at 3.3 V or 5 V supply, and up to 3 Mbit/s at 2.5 V. This is achieved using its programmable baud rate generator with prescaler (CLKSEL-selectable divide-by-1 or divide-by-4) and optimized internal timing paths. The SC16C754BIB80 achieves this performance while maintaining full compatibility with standard UART framing and error detection mechanisms.
How does the SC16C754BIB80 handle hardware flow control across four channels?
The SC16C754BIB80 implements independent auto-RTS and auto-CTS per channel using the Transmission Control Register (TCR) to define RX FIFO halt/resume thresholds. When auto-RTS is enabled, RTS deasserts when the RX FIFO reaches the halt level and reasserts when it drops to the resume level. Auto-CTS gates transmission based on CTS input state, preventing TX underflow. This logic is fully contained within the SC16C754BIB80 and requires no host CPU intervention.
Does the SC16C754BIB80 support software flow control with custom Xon/Xoff characters?
Yes, the SC16C754BIB80 supports fully programmable software flow control using two independent Xon/Xoff character pairs (Xon1/Xoff1 and Xon2/Xoff2), configured via the Enhanced Feature Register (EFR) and associated registers. The SC16C754BIB80 allows combinations including single-character, dual-character, or sequential Xon/Xoff detection, and includes 'Xon Any' mode (MCR[5]) for flexible resume behavior after Xoff reception.
What package type and pin count does the SC16C754BIB80 use?
The SC16C754BIB80 uses an LQFP80 package: plastic low-profile quad flat package with 80 leads, body dimensions 12 × 12 × 1.4 mm (SOT315-1). It includes dedicated pins for global FIFO status (TXRDY, RXRDY), interrupt control (INTSEL), and clock prescaling (CLKSEL) not present in the smaller LQFP64 variant, making it optimal for systems requiring hardware-accelerated DMA coordination.
Is the SC16C754BIB80 pin-compatible with earlier UARTs like the TL16C754?
The SC16C754BIB80 is pin-compatible with the TL16C754 in LQFP80 packaging, sharing identical signal assignments for D0–D7, A0–A2, CSA–CSD, IOR/IOW, TXA–TXD, RXA–RXD, RTS/CTS, and INTA–INTD. However, the SC16C754BIB80 adds INTSEL, TXRDY, RXRDY, and CLKSEL pins - these are NC on TL16C754, allowing backward-compatible layout with optional enhancement routing.
SC16C754BIB80,551 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 80-LQFP
- Series:
- -
- Packaging:
- Tray
- 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)
SC16C754BIB80,551 FAQ
1.How can I place an order for SC16C754BIB80,551 through Aetrix?
Please submit a Request for Quotation (RFQ) for SC16C754BIB80,551 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 SC16C754BIB80,551 reliable?
The price and inventory of SC16C754BIB80,551 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC16C754BIB80,551 is usually 5 days.
3.What payment methods are accepted for SC16C754BIB80,551?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC16C754BIB80,551 transactions.
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4.How is shipping managed for SC16C754BIB80,551?
SC16C754BIB80,551 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC16C754BIB80,551 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 SC16C754BIB80,551?
For technical support, including SC16C754BIB80,551 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC16C754BIB80,551 requirements.
6.How does Aetrix verify that SC16C754BIB80,551 is sourced from the original manufacturer or authorized distributors?
All SC16C754BIB80,551 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 SC16C754BIB80,551 meets industry standards.
7.What is the process for return or replacement of SC16C754BIB80,551?
All SC16C754BIB80,551 units undergo pre-shipment inspection (PSI). If there is an issue with SC16C754BIB80,551, 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 SC16C754BIB80,551 part is unused and in its original packaging.
Return procedure for SC16C754BIB80,551:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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