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NXP Semiconductors SC16C654BIBS,557
- Part No.:
- SC16C654BIBS,557
- Manufacturer:
- NXP Semiconductors
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
SC16C654BIBS,557.pdf
- Description:
- IC QUAD UART 64BYTE 48HVQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,664
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Product details
Overview
SC16C654BIBS,557 from NXP Semiconductors (formerly Philips) is a quad UART IC designed for high-throughput serial communication in embedded systems. It supports 5 V, 3.3 V, and 2.5 V operation, delivers up to 5 Mbit/s data rate at 5 V/3.3 V, integrates 64-byte transmit and receive FIFOs per channel, and provides selectable Intel (16-mode) or Motorola (68-mode) bus interface - used in industrial gateways, multi-port RS-232/422 terminal servers, and legacy protocol adapters.
For engineers reviewing the SC16C654BIBS,557 datasheet, SC16C654BIBS,557 pinout, SC16C654BIBS,557 application, or SC16C654BIBS,557 equivalent, key selection criteria include HVQFN48 package constraints, channel-specific modem pin availability (only Channel C has full modem I/O), absence of TXRDY/RXRDY signals, and 16/68-mode interface configuration via dedicated control pins.
Technical Context
The SC16C654BIBS,557 implements four independent asynchronous serial channels with fully programmable framing (5–8 data bits, 1/1.5/2 stop bits, even/odd/no parity) and baud rates from DC to 5 Mbit/s. Its dual-mode bus interface (16- or 68-style) is selected by the 16/68 input pin, reassigning IOR/IOW/INTA–INTD or enabling R/W/IRQ multiplexing.
Each channel features automatic hardware flow control (RTS/CTS) and software flow control (Xon/Xoff), infrared encoder/decoder support, false start-bit detection, and complete status reporting via line/transmit/receive/modem interrupt sources. The 64-byte FIFOs reduce CPU interrupt load by extending service intervals - e.g., at 115.2 kbit/s, 64-byte buffering extends unload timing to ~6.1 ms versus 1.53 ms for 16-byte FIFOs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 4 independent UARTs with separate transmit/receive FIFOs and modem control logic |
| Max Data Rate | 5 Mbit/s at 5 V or 3.3 V; 3 Mbit/s at 2.5 V - enables high-speed modem and networking links |
| FIFO Depth | 64-byte transmit and 64-byte receive FIFO per channel - reduces CPU servicing frequency by 4× vs. 16-byte FIFOs |
| Supply Voltage | 2.5 V / 3.3 V / 5 V operation - supports mixed-voltage system integration and legacy board upgrades |
| Interface Mode | Selectable Intel 16-mode (IOR/IOW/CSA–CSD) or Motorola 68-mode (R/W/CS/A3–A4) - ensures compatibility with diverse MCU buses |
| IrDA Support | Integrated infrared encoder/decoder - enables direct IR physical layer connectivity without external transceivers |
| Operating Temp | −40 °C to +85 °C industrial range - validated for deployment in factory automation and outdoor telecom equipment |
Pinout & Package
SC16C654BIBS,557 is housed in a 6 × 6 × 0.85 mm HVQFN48 package with exposed thermal pad (SOT778-3), optimized for space-constrained industrial PCBs requiring efficient heat dissipation. Pin functions differ between 16-mode and 68-mode configurations; mode selection is controlled by the 16/68 input pin.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 16/68 | Interface mode select | Logic HIGH = Intel 16-mode (IOR/IOW/CSA–CSD); LOW = Motorola 68-mode (R/W/CS/A3–A4) |
| A0–A2 | Register address select | 3-bit address for internal register access in both 16- and 68-modes |
| TXA–TXD | Transmit outputs | Four independent serial transmit outputs - each drives one UART channel |
| RXA–RXD | Receive inputs | Four independent serial receive inputs - each accepts one UART channel's data stream |
| RTSA–RTSD, CTSA–CTSD | Modem control I/O | Only Channel C (RTSC/CTSC) has full modem set (DSR/DCD/RI/DTR); Channels A/B have RTS/CTS only; Channel D has none |
| D0–D7 | Data bus I/O | 8-bit bidirectional TTL-compatible bus - interfaces directly with microcontroller data lines |
| RESET | Asynchronous reset | Active-HIGH reset (16-mode) - initializes all registers and disables TX/RX outputs |
| XTAL1/XTAL2 | Crystal oscillator interface | Supports 14.7464 MHz crystal for standard baud rates or external clock up to 20 MHz |
Key Features
| Feature | Design Value |
|---|---|
| Quad-channel FIFO architecture | 64-byte TX/RX buffers per channel eliminate burst data loss and cut CPU interrupt overhead by >75% vs. legacy 16C454 |
| Auto hardware/software flow control | RTS/CTS handshaking and Xon/Xoff character generation reduce firmware complexity and prevent buffer overrun in multi-drop networks |
| Dual-bus interface flexibility | Single device supports Intel 16-mode and Motorola 68-mode buses - eliminates need for separate designs across MCU families |
| IrDA physical layer integration | On-chip infrared encoder/decoder enables direct IR communication without external SIR/FIR PHY components |
| Configurable FIFO trigger levels | Four programmable RX/TX interrupt thresholds (1/4/8/14 bytes) allow tuning interrupt latency vs. CPU load trade-offs |
| Sleep mode & diagnostics | Low-power sleep state and internal loop-back test simplify power management and field diagnostics in deployed systems |
Applications
| Industrial Terminal Server | Legacy Protocol Gateway |
|---|---|
Use Scenario: Aggregating serial data from 4 PLCs, HMIs, and sensors into a single Ethernet backbone using RS-485/RS-232 isolation. IC Role / Device Role / Timing Role: Quad UART handles concurrent full-duplex serial streams; 64-byte FIFOs absorb burst traffic from motion controllers without packet loss. Use Value: Enables deterministic latency under 10 ms at 115.2 kbit/s across all 4 ports - critical for synchronized machine control loops. | Use Scenario: Bridging Modbus RTU devices to MQTT over Wi-Fi in smart building HVAC systems. IC Role / Device Role / Timing Role: SC16C654BIBS,557 acts as serial-to-bridge controller; IrDA mode supports local commissioning via handheld IR remotes. Use Value: Eliminates external level shifters and IR transceivers - reduces BOM cost by $1.20/unit and saves 12 mm² PCB area. |
| Multi-Port POS Terminal | Telecom Line Card |
Use Scenario: Supporting simultaneous connections to receipt printer, barcode scanner, magnetic stripe reader, and cash drawer in retail kiosks. IC Role / Device Role / Timing Role: Each UART channel manages one peripheral; auto-flow control prevents print spooling errors during high-volume transaction bursts. Use Value: Guarantees zero character loss at 9600–115200 bps across all 4 ports - required for PCI-DSS compliance in payment processing. | Use Scenario: Adding 4 E1/T1 maintenance ports to carrier-grade DSLAM line cards for remote diagnostics and firmware updates. IC Role / Device Role / Timing Role: SC16C654BIBS,557 provides isolated serial console access; 2.5 V operation matches low-power ASIC voltage domains. Use Value: Supports hot-swap-safe 2.5 V I/O while maintaining −40 °C to +85 °C operation - meets Telcordia GR-63-CORE seismic reliability requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad UART applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ST16C654CJ | PLCC68 package; includes TXRDY/RXRDY signals; full modem pins on all 4 channels | Requires larger footprint and through-hole assembly; supports legacy backplane designs with wire-OR interrupt schemes | Select when board layout allows PLCC68 and full modem I/O per channel is mandatory |
| TL16C754BPZ | LQFP64 package; identical HVQFN48 pin count but different pinout; includes IRQ output instead of INTA–INTD | Compatible with 68-mode only; lacks 16-mode interface pins (IOR/IOW/INTSEL); requires PCB redesign | Choose for new designs targeting Motorola bus architecture and simplified interrupt routing |
Compared with ST16C654CJ and TL16C754BPZ, SC16C654BIBS,557 uniquely balances compact HVQFN48 packaging, dual-bus interface support, and partial modem pin allocation - making it optimal for space-constrained industrial gateways where only one channel requires full modem signaling.
Availability
SC16C654BIBS,557 is available at Aetrix Electronics and suitable for industrial terminal servers, legacy protocol gateways, multi-port POS terminals, and telecom line cards requiring stable component supply across extended product lifecycles.
Supply support for SC16C654BIBS,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.
The SC16C654BIBS,557 belongs to NXP's legacy UART product line, engineered for backward compatibility with 16C454/554 and forward scalability in multi-channel serial infrastructure - targeting industrial automation, point-of-sale, and telecom edge equipment.
FAQ
What voltage levels does the SC16C654BIBS,557 support, and how does that affect system design?
The SC16C654BIBS,557 operates at 2.5 V, 3.3 V, and 5 V supply rails, enabling direct integration into mixed-voltage systems without level-shifting circuitry. At 2.5 V, maximum data rate is 3 Mbit/s; at 3.3 V or 5 V, it reaches 5 Mbit/s. This flexibility simplifies migration from legacy 5 V designs to modern low-power architectures while preserving performance headroom for high-speed modems and networking links - a key advantage in retrofitting industrial control panels with updated communication stacks.
Does the SC16C654BIBS,557 support both Intel and Motorola bus interfaces, and how is mode selection implemented?
Yes, the SC16C654BIBS,557 supports both Intel 16-mode and Motorola 68-mode bus interfaces via the dedicated 16/68 input pin. When pulled HIGH, it configures IOR/IOW/CSA–CSD pins for 16-mode operation; when pulled LOW, it reassigns those pins to R/W/CS/A3–A4 for 68-mode. This dual-mode capability allows a single SC16C654BIBS,557 design to serve across ARM, x86, and PowerPC-based platforms - reducing SKU proliferation and accelerating development for multi-platform embedded gateways.
Why are TXRDY and RXRDY signals not available on the SC16C654BIBS,557 HVQFN48 package?
TXRDY and RXRDY signals are omitted from the SC16C654BIBS,557 HVQFN48 package due to pin count limitations - these active-LOW status signals are only present on the 68-pin PLCC68 variant. In the HVQFN48, interrupt-driven FIFO status monitoring must be used instead, reading individual channel status registers via the D0–D7 bus. This design trade-off prioritizes compactness and thermal performance over discrete ready-signaling, aligning with modern embedded systems that rely on efficient interrupt handling rather than polling-based readiness detection.
How does the modem pin allocation differ across the four UART channels in the SC16C654BIBS,557?
In the SC16C654BIBS,557 HVQFN48 package, modem pin availability is asymmetric: only Channel C (RTSC/CTSC/DSRC/CD/RI/DTRC) provides the full set of six modem control signals. Channels A and B support RTS and CTS only; Channel D has no modem pins. This allocation reflects typical usage patterns where one channel handles primary modem communication while others manage simpler serial peripherals - enabling optimized PCB routing and reduced signal integrity complexity in compact multi-port designs.
Can the SC16C654BIBS,557 be used for infrared communication, and what configuration is required?
Yes, the SC16C654BIBS,557 includes integrated infrared encoder/decoder circuitry compliant with IrDA 1.0 (SIR). To enable IR mode, the Enhanced Feature Register (EFR) must be programmed to select the IrDA interface, and the UART's transmitter output must drive an external IR LED driver stage. No external encoder/decoder IC is needed - this reduces component count and PCB area in handheld diagnostic tools, kiosk remote interfaces, and industrial handheld terminals requiring short-range optical data exchange.
SC16C654BIBS,557 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 48-VFQFN Exposed Pad
- 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:
- Yes
- With False Start Bit Detection:
- Yes
- With Modem Control:
- Yes
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-HVQFN (6x6)
SC16C654BIBS,557 FAQ
1.How can I place an order for SC16C654BIBS,557 through Aetrix?
Please submit a Request for Quotation (RFQ) for SC16C654BIBS,557 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 SC16C654BIBS,557 reliable?
The price and inventory of SC16C654BIBS,557 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC16C654BIBS,557 is usually 5 days.
3.What payment methods are accepted for SC16C654BIBS,557?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC16C654BIBS,557 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC16C654BIBS,557?
SC16C654BIBS,557 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC16C654BIBS,557 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 SC16C654BIBS,557?
For technical support, including SC16C654BIBS,557 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC16C654BIBS,557 requirements.
6.How does Aetrix verify that SC16C654BIBS,557 is sourced from the original manufacturer or authorized distributors?
All SC16C654BIBS,557 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 SC16C654BIBS,557 meets industry standards.
7.What is the process for return or replacement of SC16C654BIBS,557?
All SC16C654BIBS,557 units undergo pre-shipment inspection (PSI). If there is an issue with SC16C654BIBS,557, 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 SC16C654BIBS,557 part is unused and in its original packaging.
Return procedure for SC16C654BIBS,557:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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