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NXP Semiconductors SC16C754BIA68,529
- Part No.:
- SC16C754BIA68,529
- Manufacturer:
- NXP Semiconductors
- Package:
- 68-LCC (J-Lead)
- Datasheet:
-
SC16C754BIA68,529.pdf
- Description:
- IC UART QUAD 64BYTE 68PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,432
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Product details
Overview
SC16C754BIA68 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 controllers, and multi-port terminal servers-supporting four independent RS-232/RS-422 channels via parallel bus interfacing.
For engineers reviewing the SC16C754BIA68 datasheet, SC16C754BIA68 pinout, SC16C754BIA68 application, or SC16C754BIA68 equivalent, key selection criteria include FIFO trigger programmability, auto-RTS/CTS timing behavior, 68-pin PLCC package compatibility, and 2.5–5 V supply flexibility across temperature ranges from −40 °C to +85 °C.
Technical Context
The SC16C754BIA68 implements four independent UART channels sharing an 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 shared TXRDY/RXRDY status pins for DMA coordination.
Its enhanced feature register (EFR) enables auto-flow control, programmable Xon/Xoff characters, and TCR-based FIFO threshold management. The baud rate generator uses a prescalable clock (via CLKSEL) and supports divisors up to 65535, enabling precise rates from 50 bps to 5 Mbit/s depending on input clock and voltage level.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data rate | Up to 5 Mbit/s at 3.3 V or 5 V; limited to 3 Mbit/s at 2.5 V - defines maximum serial throughput per channel under specified supply conditions. |
| FIFO depth | 64-byte TX and RX FIFOs - reduces CPU interrupt load and enables burst-mode DMA transfers without data loss. |
| Supply voltage | 2.5 V, 3.3 V, or 5 V operation - allows direct integration into mixed-voltage systems without level-shifting for data/control bus. |
| Operating temperature | −40 °C to +85 °C - supports deployment in industrial automation, transportation, and outdoor equipment environments. |
| Flow control | Hardware (auto-RTS/auto-CTS) and software (Xon/Xoff) - eliminates overrun errors and enables adaptive data pacing without host intervention. |
| Serial format | 5–8 data bits, 1/1.5/2 stop bits, even/odd/no parity - ensures interoperability with legacy and modern serial peripherals including modems and sensors. |
| Interrupt system | Six prioritized interrupt levels with individual channel enable/disable - allows deterministic real-time response to UART events across all four ports. |
Pinout & Package
SC16C754BIA68 is housed in a 68-pin PLCC (plastic leaded chip carrier) package with 0.05-inch pitch, suitable for through-hole mounting and reflow-compatible assembly. Pin layout follows standard PLCC orientation with corner index marker.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D0–D7 | 8-bit bidirectional data bus | Transfers register contents between host CPU and UART core; supports multiplexed access to all four channels via CSA–CSD. |
| A0–A2 | Address select inputs | Select internal register address within each UART channel (e.g., THR, RHR, IER, LCR); decoded locally per chip select. |
| CSA–CSD | Individual channel chip selects | Enable register access to UART A, B, C, or D independently; allow simultaneous configuration of multiple channels. |
| TXA–TXD / RXA–RXD | Serial transmit/receive I/O | Four independent full-duplex serial interfaces; each pair connects directly to line drivers (e.g., MAX232) for RS-232 physical layer. |
| RTSA–RTSD / CTSA–CTSD | Modem control outputs/inputs | Support hardware flow control: RTS asserts when RX FIFO has space; CTS enables transmission only when asserted by remote device. |
| INTA–INTD | Channel-specific interrupt outputs | Active-HIGH open-drain outputs; each signals error, data-ready, or modem-status events for its assigned UART channel. |
| TXRDY / RXRDY | Global FIFO status outputs | Wire-ORed active-LOW signals indicating combined readiness of all TX or RX FIFOs - used for DMA handshaking. |
| CLKSEL / INTSEL | Configuration select inputs | CLKSEL sets baud prescaler (÷1 or ÷4); INTSEL overrides MCR[3] to force continuous interrupts - both are sampled at reset. |
| RESET | Asynchronous active-HIGH reset | Clears internal registers and disables TX/RX paths; resets interrupt outputs to known state but preserves DLL/DLM/Xon/Xoff values. |
Key Features
| Feature | Design Value |
|---|---|
| Quad-channel architecture | Four independent UARTs share one 8-bit bus and power domain - reduces board space and interconnect complexity versus discrete single-UART solutions. |
| Programmable FIFO trigger levels | Separate RX/TX trigger thresholds per channel via FCR and TLR - enables fine-grained tuning of interrupt latency and DMA burst size. |
| Auto-RTS/CTS with configurable halt/resume points | Halt and resume levels stored in TCR[3:0] and TCR[7:4] - prevents RX FIFO overflow during sustained high-speed transmission without CPU polling. |
| Software flow control with dual Xon/Xoff pairs | Configurable via EFR[3:0]; supports single- or dual-character protocols - accommodates legacy terminal emulators and custom protocol stacks. |
| Internal loopback mode | Enables self-test of transmitter/receiver path without external cabling - validates UART functionality during production test or field diagnostics. |
| 5 V-tolerant data bus inputs | D0–D7 accept 5 V logic while operating at 2.5 V or 3.3 V - simplifies integration with legacy 5 V microcontrollers without external translators. |
Applications
| Industrial Multi-Port Terminal Server | Embedded PLC Communication Module |
|---|---|
|
Use Scenario: Aggregating serial data from dozens of field devices (sensors, HMIs, drives) into a single Ethernet-connected gateway. IC Role / Device Role / Timing Role: SC16C754BIA68 acts as the central serial interface hub, managing four concurrent RS-232/422 links with autonomous flow control and DMA-ready FIFO signaling. Use Value: Eliminates per-port CPU overhead; 64-byte FIFOs absorb burst traffic from asynchronous field devices; auto-RTS prevents buffer overflow during network congestion. |
Use Scenario: Adding four isolated serial ports to a programmable logic controller for Modbus RTU master/slave communication. IC Role / Device Role / Timing Role: SC16C754BIA68 provides deterministic, low-latency UART channels synchronized to the PLC's real-time scan cycle via programmable interrupt priorities. Use Value: Hardware flow control ensures reliable Modbus frame delivery under variable load; sleep mode reduces power during idle cycles without losing configuration. |
| Rack-Mounted Serial Console Server | Medical Device Data Logger |
|
Use Scenario: Enabling remote out-of-band management of IT infrastructure via secure serial console access over IP networks. IC Role / Device Role / Timing Role: SC16C754BIA68 handles four independent console sessions simultaneously, each with full modem control (DTR/DSR/RI/CD) and error reporting. Use Value: Complete status visibility (line break, framing, parity errors) aids troubleshooting; internal loopback supports pre-deployment functional validation. |
Use Scenario: Capturing time-stamped physiological sensor data (ECG, SpO₂) from analog front-ends using legacy serial protocols. IC Role / Device Role / Timing Role: SC16C754BIA68 buffers incoming sensor streams in 64-byte RX FIFOs and signals host MCU via TXRDY/RXRDY for zero-wait DMA transfers. Use Value: Prevents data loss during MCU interrupt latency spikes; 2.5 V operation enables low-power battery-backed logging subsystems. |
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 (64-pin), no CLKSEL or INTSEL pins; internally tied to VCC/GND respectively. | Requires PCB redesign for surface-mount assembly; lacks external clock prescaler and interrupt override flexibility. | Select when footprint constraints favor LQFP and CLKSEL/INTSEL functionality is unnecessary. |
| TL16C754CPTR | Texas Instruments part; pin-compatible but lacks TCR register, auto-RTS resume logic, and Xon Any function. | Supports basic hardware flow control but cannot dynamically adjust RTS deassertion based on RX FIFO fill level. | Choose for cost-sensitive designs where advanced auto-flow features are unused and TI supply chain preference applies. |
Compared with SC16C754BIA68, the SC16C754BIBM offers identical functionality in a smaller LQFP64 footprint but forfeits runtime clock prescaler control and interrupt output forcing, while TL16C754CPTR provides baseline quad UART capability without the enhanced trigger-level management and flexible software flow control found in the NXP device.
Availability
SC16C754BIA68 is available at Aetrix Electronics and suitable for industrial automation, embedded communications, and medical data acquisition requiring stable component supply and long-term lifecycle support.
Supply support for SC16C754BIA68 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.
The SC16C754BIA68 belongs to NXP's legacy UART product line designed for high-reliability, multi-channel serial bridging in resource-constrained embedded systems with demanding environmental and timing requirements.
FAQ
What voltage levels does the SC16C754BIA68 support, and how do they affect performance?
The SC16C754BIA68 operates at 2.5 V, 3.3 V, or 5 V supply voltages. At 3.3 V and 5 V, it achieves up to 5 Mbit/s data rate; at 2.5 V, maximum data rate is reduced to 3 Mbit/s. The 5 V-tolerant D0–D7 inputs allow interfacing with 5 V microcontrollers even when the SC16C754BIA68 runs at lower voltages, simplifying mixed-voltage board design without level shifters.
How does the SC16C754BIA68 implement hardware flow control, and what registers configure it?
The SC16C754BIA68 implements hardware flow control via auto-RTS and auto-CTS functions enabled through bits EFR[6] and EFR[7]. Auto-RTS assertion is controlled by RX FIFO fill level relative to thresholds programmed in the Transmission Control Register (TCR[3:0] for halt, TCR[7:4] for resume). Auto-CTS gates transmission based on CTS input state, preventing overrun when enabled.
What is the purpose of the CLKSEL and INTSEL pins on the SC16C754BIA68?
CLKSEL selects the baud rate generator prescaler (÷1 or ÷4) and is latched into MCR[7] at reset; INTSEL overrides MCR[3] to force continuous interrupt output instead of 3-state control. Both pins are present only on PLCC68 and LQFP80 packages - on LQFP64, CLKSEL is internally tied to VCC and INTSEL to GND, making them unavailable for runtime configuration in that variant.
Can the SC16C754BIA68 generate interrupts for individual UART channels, and how are they prioritized?
Yes, the SC16C754BIA68 provides four dedicated interrupt outputs (INTA–INTD), each corresponding to one UART channel. Internally, it supports six prioritized interrupt levels (receiver line status, RX timeout, RHR ready, THR empty, modem status, Xoff detection). Priority is fixed in hardware, ensuring critical events like framing errors are serviced before less urgent conditions like THR empty.
Does the SC16C754BIA68 support software flow control, and how is it configured?
Yes, the SC16C754BIA68 supports software flow control using programmable Xon/Xoff characters. Configuration is done via the Enhanced Feature Register (EFR[3:0]) to select transmit/receive Xon1/Xoff1 or Xon2/Xoff2 combinations, and the Modem Control Register (MCR[5]) to enable "Xon Any" mode. Xon/Xoff characters are compared against incoming data, and transmission halts/resumes automatically without CPU intervention.
SC16C754BIA68,529 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 68-LCC (J-Lead)
- Series:
- -
- Packaging:
- Tube
- 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)
SC16C754BIA68,529 FAQ
1.How can I place an order for SC16C754BIA68,529 through Aetrix?
Please submit a Request for Quotation (RFQ) for SC16C754BIA68,529 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 SC16C754BIA68,529 reliable?
The price and inventory of SC16C754BIA68,529 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC16C754BIA68,529 is usually 5 days.
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Once your SC16C754BIA68,529 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 SC16C754BIA68,529?
For technical support, including SC16C754BIA68,529 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC16C754BIA68,529 requirements.
6.How does Aetrix verify that SC16C754BIA68,529 is sourced from the original manufacturer or authorized distributors?
All SC16C754BIA68,529 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 SC16C754BIA68,529 meets industry standards.
7.What is the process for return or replacement of SC16C754BIA68,529?
All SC16C754BIA68,529 units undergo pre-shipment inspection (PSI). If there is an issue with SC16C754BIA68,529, 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 SC16C754BIA68,529 part is unused and in its original packaging.
Return procedure for SC16C754BIA68,529:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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