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NXP Semiconductors SC16C2550BIB48,151
- Part No.:
- SC16C2550BIB48,151
- Manufacturer:
- NXP Semiconductors
- Package:
- 48-LQFP
- Datasheet:
-
SC16C2550BIB48,151.pdf
- Description:
- IC UART DUAL W/FIFO 48-LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,203
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Product details
Overview
SC16C2550BIB48 from NXP Semiconductors is a dual-channel 5 V/3.3 V/2.5 V UART IC supporting up to 5 Mbit/s data rates, featuring independent 16-byte transmit and receive FIFOs, programmable baud rate generators, and full modem control (CTS/RTS/DSR/DTR/RI/CD) for industrial serial communication interfaces.
For engineers reviewing the SC16C2550BIB48 datasheet, SC16C2550BIB48 pinout, SC16C2550BIB48 application, or SC16C2550BIB48 equivalent, this device delivers high-throughput asynchronous serial bridging in embedded controllers, industrial gateways, and legacy RS-232/RS-485 interface cards where CPU bandwidth reduction and multi-channel timing coordination are critical.
Technical Context
The SC16C2550BIB48 implements two independent UART channels (A and B), each with dedicated register sets accessible via A0–A2 address lines and CSA/CSB chip selects. It supports DMA mode operation using TXRDYA/TXRDYB and RXRDYA/RXRDYB active-low handshake signals tied to FIFO trigger levels.
Its programmable baud rate generator divides an external clock (up to 80 MHz) by divisors 1–65535 to achieve standard and custom rates (e.g., 115.2 kbit/s with 1.8432 MHz crystal); internal loopback mode enables hardware-level TX/RX path validation without external cabling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | Dual independent UARTs (A and B) with separate register banks and interrupt outputs (INTA/INTB) |
| Max Data Rate | 5 Mbit/s at 5 V/3.3 V; 3 Mbit/s at 2.5 V - enables high-speed modem and ISDN interface support |
| FIFO Depth | 16-byte TX and RX FIFOs - reduces CPU interrupt load from ≤100 µs to 1.53 ms at 115.2 kbit/s |
| Supply Voltage | 2.5 V, 3.3 V, or 5 V operation - supports mixed-voltage system integration and legacy board upgrades |
| Interrupt Control | Four selectable RX FIFO trigger levels (1/4/8/14 bytes) and prioritized interrupt system - optimizes real-time response in multi-channel environments |
| Modem Interface | Full hardware handshaking: CTS/RTS/DSR/DTR/RI/CD per channel - enables robust RS-232 link management |
| Package | LQFP48 (7 × 7 × 1.4 mm) with 48 leads - surface-mount compatible for industrial PCB layouts |
Pinout & Package
SC16C2550BIB48 is housed in a plastic low-profile quad flat package (LQFP48) with 48 leads, body size 7 × 7 × 1.4 mm, lead pitch 0.5 mm, and exposed thermal pad (SOT313-2). Pin functions are validated per NXP datasheet Rev. 05 (2009), Figure 5 and Table 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A2 | Address select inputs | Select internal register address (0–7) for read/write access to THR/RHR/IER/FCR/LCR/MCR/MSR/SPR |
| CSA / CSB | Channel-select chip enables | Active-low enables UART A or B independently; allows shared data bus operation between dual channels |
| D0–D7 | Bidirectional 8-bit data bus | 3-state TTL-compatible interface for CPU register access; D0 = LSB of parallel data |
| TXA / TXB | Transmit serial outputs | Active-high UART channel A/B serial output; logic 1 during reset/idle; disabled in loopback mode |
| RXA / RXB | Receive serial inputs | Active-high UART channel A/B serial input; internally disconnected in loopback mode |
| INTA / INTB | Channel-specific interrupt outputs | Active-low open-drain interrupts triggered by RX data, TX empty, line status, or modem events |
| RXRDYA / RXRDYB | FIFO-ready status outputs | Active-low indicates ≥1 byte available in RX FIFO; used for DMA mode 1 handshaking |
| TXRDYA / TXRDYB | FIFO-ready status outputs | Active-low indicates ≥1 empty location in TX FIFO; used for DMA mode 1 handshaking |
| RTSA / RTSB | Request-to-send outputs | Active-low modem control signals; set via MCR[1] to indicate transmit readiness |
| CTSA / CTSB | Clear-to-send inputs | Active-low modem feedback indicating readiness to accept TX data; status readable in MSR[4] |
| RESET | Asynchronous reset input | Active-high resets all registers and disables TX/RX outputs; initializes device to ST16C2450 compatibility mode |
Key Features
| Feature | Design Value |
|---|---|
| Independent TX/RX baud rate control | Single programmable divider supports different rates per channel via DLL/DLM registers |
| Four RX FIFO trigger levels | Configurable interrupt thresholds (1/4/8/14 bytes) optimize interrupt frequency vs. latency trade-off |
| Internal loopback diagnostics | Hardware-isolated TX→RX path validation without external wiring or modem connection |
| False start-bit detection | Rejects spurious noise-induced framing errors before character assembly begins |
| 3-state TTL drive capability | Enables direct connection to shared CPU data buses without external bus transceivers |
| Line break generation/detection | Supports long-break signaling for protocol synchronization and remote device reset |
Applications
| Industrial Serial Gateway | Legacy Equipment Interface Card |
|---|---|
Use Scenario: Aggregating RS-232 data streams from PLCs, HMIs, and sensors into a single Ethernet or CAN backbone. IC Role / Device Role / Timing Role: Dual UART bridges two independent serial links while offloading CPU interrupt servicing via 16-byte FIFOs and configurable RX trigger levels. Use Value: Reduces host processor interrupt overhead by >90% compared to non-FIFO UARTs, enabling deterministic real-time scheduling in Linux-based gateways. |
Use Scenario: Retrofitting ISA/PCI expansion cards for CNC machines, medical analyzers, or point-of-sale terminals requiring native RS-232 support. IC Role / Device Role / Timing Role: Replaces obsolete ST16C2450 with pin-compatible upgrade delivering higher throughput and software compatibility. Use Value: Enables 5 Mbit/s operation at 3.3 V, eliminating level-shifter requirements and simplifying power design on aging backplane architectures. |
| Multi-Port Modem Controller | Embedded Communication Module |
Use Scenario: Managing simultaneous dial-up, fax, and telemetry connections in remote telemetry units deployed in utility substations. IC Role / Device Role / Timing Role: Provides full modem control (CTS/RTS/DSR/DTR/RI/CD) per channel with prioritized interrupt handling for concurrent session management. Use Value: Eliminates need for discrete logic or FPGA glue logic by integrating complete modem interface functionality per UART channel. |
Use Scenario: Enabling serial debug, firmware update, and sensor telemetry in compact IoT edge nodes with constrained PCB area. IC Role / Device Role / Timing Role: Delivers dual asynchronous serial ports in LQFP48 footprint with 2.5 V operation for ultra-low-power MCU coexistence. Use Value: Supports direct connection to 2.5 V microcontrollers without voltage translation, reducing BOM count and layout complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual UART applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SC16C2550BIA44 | Same die, PLCC44 package (SOT187-2); no RXRDY/TXRDY pins; different pinout and thermal profile | Suitable for through-hole prototyping or legacy PLCC sockets; lacks DMA-ready handshake signals | Select when mechanical compatibility with existing PLCC footprints is required over surface-mount density |
| SC16C2550BIBS | Same die, HVQFN32 package (SOT617-1); 32-pin, 5×5 mm; no RXRDY/TXRDY pins; smaller footprint | Optimized for space-constrained portable designs; requires rework of PCB layout and thermal management | Select when board area is critical and DMA handshaking is not needed for host interface |
Compared with SC16C2550BIA44 and SC16C2550BIBS, the SC16C2550BIB48 uniquely provides both LQFP48 mechanical compatibility and full RXRDY/TXRDY signal availability - essential for deterministic DMA-driven serial data transfer in industrial real-time systems.
Availability
SC16C2550BIB48 is available at Aetrix Electronics and suitable for industrial serial gateways, legacy equipment interface cards, and multi-port modem controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SC16C2550BIB48 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 headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.
The SC16C2550BIB48 belongs to NXP's legacy UART product line, designed specifically for high-reliability industrial serial communication where software compatibility with 16C2450 and hardware extensibility via FIFOs and modem control are mandatory.
FAQ
What voltage levels does the SC16C2550BIB48 support?
The SC16C2550BIB48 operates at 2.5 V, 3.3 V, or 5 V supply voltages, with 5 V tolerance on input-only pins (D7–D0). This triple-voltage capability allows seamless integration into mixed-signal systems and backward compatibility with legacy 5 V designs while supporting modern low-voltage MCUs. The SC16C2550BIB48 maintains full functionality-including 5 Mbit/s data rate-at 3.3 V and 3 Mbit/s at 2.5 V.
How does the SC16C2550BIB48 handle interrupt prioritization between its two UART channels?
The SC16C2550BIB48 uses a fixed-priority interrupt architecture where INTA and INTB are independent outputs, but internal interrupt sources (RX data ready, TX empty, line status, modem status) are prioritized per channel. When both channels assert interrupts simultaneously, the highest-priority pending condition per channel determines which ISR bit is reported first. The SC16C2550BIB48 does not arbitrate between INTA and INTB externally-the host CPU must poll both IER and ISR registers separately to resolve concurrent events.
Can the SC16C2550BIB48 be used with a 1.8432 MHz crystal?
Yes, the SC16C2550BIB48 supports a 1.8432 MHz crystal connected between XTAL1 and XTAL2, enabling standard baud rates including 9600, 19.2k, 38.4k, 57.6k, and 115.2k bit/s. The SC16C2550BIB48's programmable baud rate generator uses divisor values documented in Table 7 of the datasheet (e.g., DLL=0x01, DLM=0x00 for 115.2k bit/s). External clock input up to 80 MHz is also supported for custom rates.
What is the function of the RXRDYA and RXRDYB pins on the SC16C2550BIB48?
RXRDYA and RXRDYB are active-low outputs indicating that at least one byte is available in the respective channel's receive FIFO or RHR. These signals are used primarily for DMA Mode 1 handshaking: a logic 0 triggers DMA read cycles, and the pin returns high only after the FIFO drops below the programmed trigger level. The SC16C2550BIB48 provides these pins exclusively in PLCC44 and LQFP48 packages-unlike HVQFN32 or DIP40 variants.
Is the SC16C2550BIB48 pin-compatible with the ST16C2550?
Yes, the SC16C2550BIB48 is explicitly stated as pin-compatible with the ST16C2550 in the NXP datasheet. Both devices share identical LQFP48 pinouts, signal assignments, and electrical characteristics, allowing direct replacement in existing ST16C2550-based designs without PCB modification. The SC16C2550BIB48 further ensures software compatibility with ST16C2450 upon power-up reset.
SC16C2550BIB48,151 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 48-LQFP
- Series:
- -
- Packaging:
- Tray
- Product Status:
- Obsolete
- Features:
- -
- Number of Channels:
- 2, DUART
- FIFO's:
- 16 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:
- 48-LQFP (7x7)
SC16C2550BIB48,151 FAQ
1.How can I place an order for SC16C2550BIB48,151 through Aetrix?
Please submit a Request for Quotation (RFQ) for SC16C2550BIB48,151 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 SC16C2550BIB48,151 reliable?
The price and inventory of SC16C2550BIB48,151 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC16C2550BIB48,151 is usually 5 days.
3.What payment methods are accepted for SC16C2550BIB48,151?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC16C2550BIB48,151 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC16C2550BIB48,151?
SC16C2550BIB48,151 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC16C2550BIB48,151 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 SC16C2550BIB48,151?
For technical support, including SC16C2550BIB48,151 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC16C2550BIB48,151 requirements.
6.How does Aetrix verify that SC16C2550BIB48,151 is sourced from the original manufacturer or authorized distributors?
All SC16C2550BIB48,151 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 SC16C2550BIB48,151 meets industry standards.
7.What is the process for return or replacement of SC16C2550BIB48,151?
All SC16C2550BIB48,151 units undergo pre-shipment inspection (PSI). If there is an issue with SC16C2550BIB48,151, 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 SC16C2550BIB48,151 part is unused and in its original packaging.
Return procedure for SC16C2550BIB48,151:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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