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NXP Semiconductors SC16C754BIA68,518
- Part No.:
- SC16C754BIA68,518
- Manufacturer:
- NXP Semiconductors
- Package:
- 68-LCC (J-Lead)
- Datasheet:
-
SC16C754BIA68,518.pdf
- Description:
- IC UART QUAD W/FIFO 68-PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,086
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Product details
Overview
SC16C754BIA68,518 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/5 V operation. It serves as a high-density serial interface controller in industrial communication gateways, embedded modems, and multi-port terminal servers-enabling simultaneous RS-232/RS-485 channel management via a single 8-bit parallel bus.
For engineers reviewing the SC16C754BIA68,518 datasheet, SC16C754BIA68,518 pinout, SC16C754BIA68,518 application, or SC16C754BIA68,518 equivalent, key selection criteria include FIFO trigger programmability, auto-RTS/CTS timing behavior, PLCC68 package compatibility, and 2.5–5 V supply flexibility across temperature ranges from −40 °C to +85 °C.
Technical Context
The SC16C754BIA68,518 implements four independent UART channels sharing a common 8-bit parallel bus, each with dedicated modem control (RTS/CTS/DSR/DTR/RI/CD), status reporting, and prioritized interrupt logic. Its enhanced feature register (EFR) enables configuration of Xon/Xoff characters, auto-flow control modes, and special character detection.
FIFO operation is managed via dual-level threshold registers: the FIFO Control Register (FCR) selects fixed trigger points (1/4/8/14 bytes), while the Transmission Control Register (TCR) provides programmable halt/resume levels for auto-RTS and software flow control. Baud rate generation uses a prescalable clock (÷1 or ÷4 selected by CLKSEL) and a 16-bit divisor for precise timing across 50 bps–5 Mbit/s.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 4 independent UARTs with full modem signal support (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/RX FIFO per channel - reduces CPU interrupt load and supports burst-mode DMA transfers |
| Supply Voltage | 2.5 V, 3.3 V, or 5 V operation - allows direct interfacing with mixed-voltage legacy and modern systems |
| Temperature Range | −40 °C to +85 °C industrial grade - validated for deployment in factory automation and outdoor telecom equipment |
| Flow Control | Hardware (auto-RTS/auto-CTS) and software (Xon/Xoff) - eliminates overrun errors without host software intervention |
| Interrupt Priority | 6-level prioritized interrupt system - ensures timely error handling and prevents status loss during heavy traffic |
Pinout & Package
SC16C754BIA68,518 is housed in a plastic leaded chip carrier (PLCC68) package with 68 leads, designed for through-hole mounting and reflow-compatible assembly. The package body measures 24.2 mm × 24.2 mm × 4.0 mm and features internal power/ground planes for noise resilience in multi-channel serial environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A2 | Address select inputs | Select internal register address (0–7) for 8-bit parallel bus access to UART A–D control/status registers |
| CSA–CSD | Channel-select chip enables | Enable data transfer for individual UART channels A–D; active-low logic allows independent channel addressing |
| D0–D7 | 8-bit bidirectional data bus | Transfers register contents and serial data; D0 = LSB; compatible with standard microcontroller bus timing |
| IOR / IOW | Read/write strobes | Active-low signals synchronize register reads/writes; edge-triggered to avoid bus contention |
| INTA–INTD | Per-channel interrupt outputs | Active-high, 3-state interrupts; individually maskable via IER; support daisy-chained or vectored interrupt handling |
| RESET | Global reset input | Active-high signal clears internal registers and disables TX/RX; resets all outputs to known states (e.g., RTS/DTR = HIGH) |
| TXA–TXD / RXA–RXD | Serial I/O per channel | Asynchronous TTL-level transmit/receive lines; support local loopback for on-board diagnostics |
| RTSA–RTSD / CTSA–CTSD | Modem control outputs/inputs | Active-low RTS/CTS signals; auto-RTS deactivates when RX FIFO reaches TCR[3:0] level; auto-CTS halts TX before stop bit completion |
| CLKSEL / INTSEL | Configuration select pins | CLKSEL sets baud prescaler (÷1/÷4); INTSEL overrides MCR[3] to force continuous interrupts - both are PLCC68-specific |
| RXRDY / TXRDY | Aggregate FIFO status outputs | Active-low wire-ORed signals indicating any channel's RX/TX FIFO has reached trigger level - simplifies DMA handshake logic |
Key Features
| Feature | Design Value |
|---|---|
| Programmable FIFO trigger levels | Independent RX/TX trigger thresholds via TCR register enable precise DMA buffer management and latency control |
| Auto-RTS/CTS with configurable halt/resume points | Eliminates receiver overrun by dynamically asserting RTS only when RX FIFO space exceeds TCR[7:4] and deasserting at TCR[3:0] |
| Software flow control with dual Xon/Xoff pairs | Supports flexible token-based throttling (Xon1/Xoff1, Xon2/Xoff2, or combinations) without requiring external protocol stack changes |
| False start-bit detection | Prevents spurious framing errors caused by noise on RX lines - critical for reliable operation in electrically noisy industrial settings |
| Internal loopback mode | Enables full self-test of transmitter/receiver paths without external cabling - reduces validation time during board bring-up |
| Sleep mode with wake-on-RX | Reduces power consumption during idle periods while maintaining responsiveness to incoming serial activity |
Applications
| Industrial Multi-Port Terminal Server | Embedded Modem Interface |
|---|---|
|
Use Scenario: Aggregating serial console access from 4 PLCs, HMIs, and sensors into a single Ethernet-connected gateway. IC Role / Device Role / Timing Role: Quad UART bridges asynchronous RS-232 traffic to a Linux-based ARM processor using shared 8-bit bus and DMA-driven FIFOs. Use Value: 64-byte FIFOs reduce interrupt frequency by >90% versus 16-byte alternatives, enabling deterministic response under 100+ kbps aggregate load. |
Use Scenario: Providing four independent AT-command channels between a cellular modem module and host MCU in a telematics unit. IC Role / Device Role / Timing Role: Manages simultaneous PPP negotiation, GPS NMEA streaming, SMS command parsing, and firmware update logging over separate UARTs. Use Value: Auto-RTS/CTS prevents packet loss during high-throughput firmware downloads, while Xon/Xoff handles variable-rate GPS data bursts. |
| Factory Automation Backplane | Medical Device Serial Hub |
|
Use Scenario: Interfacing legacy RS-485 field devices (drives, I/O modules) to a real-time motion controller via isolated transceivers. IC Role / Device Role / Timing Role: Provides galvanically isolated serial ports with precise baud rate accuracy (±1.5%) across −40 °C to +85 °C ambient. Use Value: Prescaler + 16-bit divisor achieves stable 921.6 kbps operation even with ±100 ppm crystal tolerance - meeting IEC 61800-3 EMC requirements. |
Use Scenario: Centralizing serial diagnostics from ECG, SpO₂, and infusion pump modules into a patient monitor's mainboard. IC Role / Device Role / Timing Role: Acts as fault-tolerant serial concentrator with per-channel break detection, framing error logging, and priority interrupt routing. Use Value: Independent interrupt lines (INTA–INTD) allow immediate isolation of failing peripherals without polling overhead - critical for IEC 62304 Class C compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad UART applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SC16C754BIBM | LQFP64 package (7 × 7 mm); no CLKSEL or INTSEL pins; CLKSEL internally tied to VCC (÷1 prescaler only) | Suitable for space-constrained PCBs where PLCC68 footprint is unavailable; lacks configurable prescaler and forced-interrupt mode | Select SC16C754BIBM for compact surface-mount designs requiring identical functionality but without advanced clock/interrupt control. |
| TL16C754CPTR | Texas Instruments part; pin-compatible but lacks TCR register, auto-RTS resume trigger, and Xon Any function; max 3 Mbit/s at 3.3 V | Valid for cost-sensitive legacy replacements where enhanced flow control and 5 Mbit/s are not required | Choose TL16C754CPTR only if existing firmware relies on TI-specific register mapping and 5 Mbit/s performance is unnecessary. |
Compared with SC16C754BIA68,518, the SC16C754BIBM offers identical core UART functionality in a smaller LQFP64 package but omits CLKSEL/INTSEL configurability, while the TL16C754CPTR provides basic quad UART capability at lower speed and without programmable auto-flow thresholds - making SC16C754BIA68,518 the optimal choice for new industrial designs demanding precision timing and adaptive flow control.
Availability
SC16C754BIA68,518 is available at Aetrix Electronics and suitable for industrial multi-port terminal servers, embedded modem interfaces, and factory automation backplanes requiring stable component supply and long-term lifecycle support.
Supply support for SC16C754BIA68,518 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 deep expertise in interface, power management, and RF technologies.
The SC16C754BIA68,518 belongs to NXP's legacy industrial UART product line, engineered specifically for high-reliability serial communication in harsh environments where deterministic latency, robust error handling, and mixed-voltage interoperability are essential.
FAQ
What voltage levels does the SC16C754BIA68,518 support?
The SC16C754BIA68,518 operates across three supply rails: 2.5 V, 3.3 V, and 5 V. At 2.5 V, maximum data rate is 3 Mbit/s; at 3.3 V or 5 V, it achieves up to 5 Mbit/s. Input pins D7–D0 are 5 V tolerant, allowing safe interfacing with legacy 5 V microcontrollers even when the core logic runs at 2.5 V or 3.3 V. This multi-voltage capability makes SC16C754BIA68,518 ideal for mixed-signal industrial systems undergoing voltage migration.
How does auto-RTS behavior differ between SC16C754BIA68,518 and older UARTs like TL16C754?
Unlike the TL16C754, the SC16C754BIA68,518 implements fully programmable auto-RTS using the Transmission Control Register (TCR). It supports independent halt and resume trigger levels (TCR[3:0] and TCR[7:4]) to prevent data overrun while minimizing false pauses. The TL16C754 uses fixed thresholds and lacks resume-level control, leading to longer transmission gaps. This precision timing in SC16C754BIA68,518 improves throughput in high-speed serial links such as modem handshaking or firmware updates.
Can SC16C754BIA68,518 generate interrupts for individual UART channel events?
Yes, SC16C754BIA68,518 provides four dedicated active-high interrupt outputs (INTA–INTD), one per UART channel. Each can be enabled independently via the Modem Control Register (MCR[3]) and Interrupt Enable Register (IER). These outputs support both edge-triggered and level-sensitive handling, and reflect six prioritized interrupt sources including RX FIFO timeout, TX buffer empty, modem status change, and Xoff detection. This per-channel granularity eliminates polling and enables efficient real-time response in SC16C754BIA68,518-based systems.
What is the purpose of the CLKSEL pin on SC16C754BIA68,518?
The CLKSEL pin on SC16C754BIA68,518 selects the baud rate generator prescaler: logic HIGH configures ÷1 division, logic LOW configures ÷4 division. This setting is latched into MCR[7] at RESET and can be modified in software. The ÷4 option extends usable crystal frequencies (e.g., 24 MHz → effective 6 MHz reference), enabling accurate low-baud-rate generation (e.g., 50 bps) without requiring ultra-low-frequency crystals. CLKSEL is present only on PLCC68 and LQFP80 packages - absent in LQFP64 variants.
Does SC16C754BIA68,518 support software flow control with custom Xon/Xoff characters?
Yes, SC16C754BIA68,518 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 character registers. EFR[3:0] defines which pair(s) are active for transmit and receive. The "Xon Any" function (MCR[5]) further allows resumption after any received character post-Xoff, enhancing robustness in noisy environments. This configurability is absent in baseline UARTs and makes SC16C754BIA68,518 suitable for legacy protocol adaptation.
SC16C754BIA68,518 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 68-LCC (J-Lead)
- 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:
- 68-PLCC (24.18x24.18)
SC16C754BIA68,518 FAQ
1.How can I place an order for SC16C754BIA68,518 through Aetrix?
Please submit a Request for Quotation (RFQ) for SC16C754BIA68,518 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 SC16C754BIA68,518 reliable?
The price and inventory of SC16C754BIA68,518 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC16C754BIA68,518 is usually 5 days.
3.What payment methods are accepted for SC16C754BIA68,518?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC16C754BIA68,518 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC16C754BIA68,518?
SC16C754BIA68,518 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC16C754BIA68,518 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 SC16C754BIA68,518?
For technical support, including SC16C754BIA68,518 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC16C754BIA68,518 requirements.
6.How does Aetrix verify that SC16C754BIA68,518 is sourced from the original manufacturer or authorized distributors?
All SC16C754BIA68,518 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 SC16C754BIA68,518 meets industry standards.
7.What is the process for return or replacement of SC16C754BIA68,518?
All SC16C754BIA68,518 units undergo pre-shipment inspection (PSI). If there is an issue with SC16C754BIA68,518, 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 SC16C754BIA68,518 part is unused and in its original packaging.
Return procedure for SC16C754BIA68,518:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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