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NXP Semiconductors SC16C2550IB48,128
- Part No.:
- SC16C2550IB48,128
- Manufacturer:
- NXP Semiconductors
- Package:
- 48-LQFP
- Datasheet:
-
SC16C2550IB48,128.pdf
- Description:
- IC DUART 5MBPS 48LQFP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SC16C2550IB48,128 from NXP Semiconductors (formerly Philips) is a dual-channel UART IC with independent 16-byte transmit and receive FIFOs, integrated IrDA encoder/decoder, and programmable baud rate generators supporting up to 5 Mbits/s at 5 V/3.3 V. It operates across 2.5 V–5 V supply rails and industrial temperature range (−40 °C to +85 °C), and serves as a drop-in upgrade to ST16C2450 in legacy serial communication subsystems for industrial control panels and embedded modems.
For engineers reviewing the SC16C2550IB48,128 datasheet, SC16C2550IB48,128 pinout, SC16C2550IB48,128 application, or SC16C2550IB48,128 equivalent, key selection considerations include FIFO-triggered DMA readiness signals (TXRDYA/B, RXRDYA/B), hardware/software flow control support, independent channel interrupt prioritization, and LQFP48 package compatibility with legacy PLCC44/DIP40 footprints in space-constrained PCB layouts.
Technical Context
The SC16C2550IB48,128 implements two fully independent UART channels (A and B), each with dedicated 16-byte FIFOs, separate register sets (THR/RHR, IER/ISR, FCR, LCR/LSR, MCR/MSR, DLL/DLM), and autonomous baud rate generation. Its internal architecture supports simultaneous DMA Mode 1 operation using TXRDY/RXRDY handshaking and software-configurable receive FIFO trigger levels (1/4/8/14 bytes).
It integrates full modem control logic (CTS/RTS/DSR/DTR/RI/DCD), false start-bit detection, line break generation/detection, and internal loop-back diagnostics. The device uses a single 16× clock divider with divisor range 1–65535, enabling precise baud rates from DC to 1.5 Mbit/s (standard) or up to 5 Mbit/s (with 80 MHz clock input), while maintaining software compatibility with INS8250 and SC16C550 after power-on reset.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | Dual independent UART A and B with separate register banks and interrupt outputs (INTA/INTB) |
| FIFO depth | 16-byte transmit and 16-byte receive FIFO per channel - reduces CPU interrupt load by extending service interval from ~93 µs to 1.53 ms at 115.2 kbit/s |
| Max data rate | 5 Mbits/s at 5 V/3.3 V; 3 Mbits/s at 2.5 V - enables high-speed modem and ISDN interface applications |
| Supply voltage | 2.5 V, 3.3 V, and 5 V operation - supports mixed-voltage system integration without level-shifting |
| Temperature range | Industrial: −40 °C to +85 °C - qualified for deployment in factory automation and outdoor telecom equipment |
| IrDA support | Integrated IrDA encoder/decoder - enables direct infrared wireless serial link without external PHY components |
| Interrupt priority | Prioritized interrupt system with Receive Data Ready and Receive Time-Out sharing highest priority - ensures deterministic latency for time-critical serial framing |
Pinout & Package
LQFP48 package (SOT313-2), 7 × 7 × 1.4 mm body, 0.5 mm pitch, exposed pad (not electrically connected). Pin 1 marked via corner cut or dot; pins numbered counter-clockwise from top-left.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D0–D7 | Bi-directional 8-bit data bus | 3-State TTL-compatible interface to microcontroller or bus controller; D0 = LSB |
| A0–A2 | Register address select | Selects among 8 internal register addresses per channel (e.g., THR/RHR, IER, FCR, LCR) |
| CSA / CSB | Channel-select chip enable | Active-low enables UART A or B independently - allows shared data bus with discrete channel addressing |
| TXA / TXB | Transmit serial output | CMOS/TTL-level asynchronous serial output (logic 1 idle); disabled during reset or loop-back mode |
| RXA / RXB | Receive serial input | CMOS/TTL-level asynchronous serial input; internally looped to TX during diagnostic mode |
| TXRDYA / TXRDYB | Transmit FIFO ready indicator | Active-low signal indicating ≥1 empty location in TX FIFO - used for DMA Mode 1 block transfers |
| RXRDYA / RXRDYB | Receive FIFO ready indicator | Active-low signal indicating ≥1 character available above programmed trigger level - enables burst read efficiency |
| INTA / INTB | Channel-specific interrupt output | 3-State open-drain output; asserts on RX/TX status, error, or modem event - configurable per channel via IER |
| RTSA / RTSB | Request-to-send control output | Active-low modem handshake output; auto-controlled in hardware flow mode when EFR[6] = 1 |
| CTSA / CTSB | Clear-to-send input | Active-low modem handshake input; suspends TX when logic 1 - monitored via MSR[4] |
| IOR / IOW | Read/write strobe control | Active-low edge-triggered bus control signals - synchronize register access with CPU timing |
| RESET | Global synchronous reset | Active-high resets all registers, disables TX/RX outputs, clears FIFOs - initializes to ST16C2450-compatible state |
| XTAL1 / XTAL2 | Crystal oscillator interface | XTAL1 accepts crystal (1–25 MHz) or external clock; XTAL2 is buffered output - supports precise baud rate derivation |
| VCC / GND | Power supply terminals | VCC = 2.5/3.3/5 V; GND = signal/power reference - decoupling required per datasheet layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Four selectable RX FIFO trigger levels | 1/4/8/14 characters - optimizes interrupt frequency vs. latency trade-off in multi-channel systems |
| Automatic hardware flow control | RTS/CTS managed autonomously via EFR bits - eliminates CPU polling overhead for buffer overflow prevention |
| Programmable Xon/Xoff characters | Configurable 1- or 2-byte software flow control tokens - enables robust protocol-level handshaking over noisy links |
| Sleep mode | Reduces current consumption during idle periods - extends battery life in portable serial gateway devices |
| False start-bit detection | Rejects spurious noise-induced framing errors - improves reliability in electrically noisy industrial environments |
| Internal loop-back diagnostics | Isolates physical layer faults by routing TX output to RX input internally - enables firmware-based link validation |
Applications
| Industrial HMI Terminal | Legacy Modem Interface |
|---|---|
|
Use Scenario: Serial communication between PLC and touch-panel HMI in factory floor control cabinet. IC Role / Device Role / Timing Role: Dual UART bridges RS-232/RS-485 physical layers to microcontroller parallel bus, handling concurrent configuration updates and real-time sensor logging. Use Value: 16-byte FIFOs reduce interrupt servicing time by >90% versus 1-byte-buffer UARTs, freeing CPU cycles for motion control algorithms. |
Use Scenario: High-speed data pump in ISDN terminal adapter supporting 460.8 kbit/s compressed data streams. IC Role / Device Role / Timing Role: UART A handles AT command channel; UART B manages data channel with independent 460.8 kbit/s baud rate derived from 7.3728 MHz crystal. Use Value: Programmable 16× clock divider enables exact standard baud rates without external PLL - simplifies compliance testing. |
| Medical Device Serial Gateway | Infrared Remote Control Hub |
|
Use Scenario: Secure data aggregation node connecting multiple bedside monitors via isolated RS-232 to central nursing station. IC Role / Device Role / Timing Role: Dual UART provides galvanically isolated serial ports with hardware flow control to prevent buffer overrun during ECG waveform bursts. Use Value: Independent RTS/CTS per channel prevents cross-talk between patient data streams - meets IEC 60601-1 safety isolation requirements. |
Use Scenario: Consumer IR remote hub translating RC-5/NEC commands into UART packets for smart home controller. IC Role / Device Role / Timing Role: Integrated IrDA encoder/decoder converts UART data to 38 kHz carrier-modulated IR pulses without external transceiver. Use Value: Eliminates discrete IR LED driver and photodiode amplifier - reduces BOM count and PCB area by 30%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual UART applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ST16C2550 | Pin-compatible but lacks IrDA encoder/decoder; identical FIFO depth, baud rate range, and register map | Requires external IrDA PHY for infrared functionality; suitable where IR is not needed | Select ST16C2550 only if infrared capability is omitted and legacy ST part sourcing is preferred |
| SC16C752BIA44 | Same manufacturer family; adds 64-byte FIFOs, fractional baud rate generator, and enhanced interrupt masking | Higher interrupt latency tolerance due to deeper FIFOs; supports higher data compression ratios in modem designs | Choose SC16C752BIA44 when upgrading for future-proofing or >5 Mbit/s throughput with external clock |
Compared with ST16C2550 and SC16C752BIA44, the SC16C2550IB48,128 uniquely balances IrDA integration, industrial temperature support, and LQFP48 footprint in a mature, production-proven dual UART - making it optimal for cost-sensitive, space-constrained legacy upgrades where infrared is required.
Availability
SC16C2550IB48,128 is available at Aetrix Electronics and suitable for industrial HMI terminals, legacy modem interfaces, medical serial gateways, and infrared remote hubs requiring stable component supply and long-term lifecycle assurance.
Supply support for SC16C2550IB48,128 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, headquartered in Eindhoven, Netherlands, develops high-performance analog and mixed-signal ICs for automotive, industrial, and IoT applications, with leadership in secure connectivity and power management.
The SC16C2550IB48,128 belongs to NXP's legacy serial interface product line, designed specifically for backward-compatible upgrades of 16C2450-based systems while adding FIFO buffering, IrDA, and multi-voltage operation for industrial serial infrastructure.
FAQ
What is the maximum data rate supported by the SC16C2550IB48,128?
The SC16C2550IB48,128 supports up to 5 Mbits/s at 5 V or 3.3 V supply, and 3 Mbits/s at 2.5 V. This performance requires an 80 MHz clock input to the internal 16× baud rate generator. At standard 7.3728 MHz crystal input, the SC16C2550IB48,128 achieves up to 460.8 kbit/s - sufficient for ISDN and high-speed modem applications.
Does the SC16C2550IB48,128 support automatic hardware flow control?
Yes, the SC16C2550IB48,128 supports automatic hardware flow control via RTS/CTS signaling. When enabled by setting EFR[6] (RTS) and EFR[7] (CTS) to logic 1, the SC16C2550IB48,128 autonomously asserts RTS when the receive FIFO reaches its trigger level and monitors CTS to suspend transmission - eliminating CPU intervention for buffer management.
How does the SC16C2550IB48,128 handle interrupt prioritization between UART A and UART B?
The SC16C2550IB48,128 uses a prioritized interrupt system where INTA and INTB are independent outputs, each driven by its own channel's interrupt enable register (IER). Within each channel, Receive Data Ready and Receive Time-Out share the highest priority, while modem status interrupts (CTS/RTS) have lowest priority - ensuring time-critical framing errors are serviced before handshake events.
Can the SC16C2550IB48,128 operate from a 2.5 V supply?
Yes, the SC16C2550IB48,128 is fully specified for 2.5 V operation across the industrial temperature range (−40 °C to +85 °C). At 2.5 V, its maximum data rate is reduced to 3 Mbits/s, and all I/O pins maintain TTL-compatible thresholds. Power supply decoupling must follow Philips' recommended 100 nF + 10 µF per VCC pin per datasheet Section 9.2.
What is the function of the TXRDYA and RXRDYA pins on the SC16C2550IB48,128?
TXRDYA and RXRDYA are active-low, channel-A-specific handshaking signals. TXRDYA indicates ≥1 empty location in the transmit FIFO; RXRDYA indicates ≥1 character available above the programmed receive FIFO trigger level. Both are used primarily for DMA Mode 1 block transfers but also support polled-mode burst reads/writes - reducing bus transaction overhead versus byte-by-byte access.
SC16C2550IB48,128 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 48-LQFP
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- 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:
- Yes
- With False Start Bit Detection:
- Yes
- With Modem Control:
- Yes
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-LQFP (7x7)
SC16C2550IB48,128 FAQ
1.How can I place an order for SC16C2550IB48,128 through Aetrix?
Please submit a Request for Quotation (RFQ) for SC16C2550IB48,128 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 SC16C2550IB48,128 reliable?
The price and inventory of SC16C2550IB48,128 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC16C2550IB48,128 is usually 5 days.
3.What payment methods are accepted for SC16C2550IB48,128?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC16C2550IB48,128 transactions.
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4.How is shipping managed for SC16C2550IB48,128?
SC16C2550IB48,128 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC16C2550IB48,128 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 SC16C2550IB48,128?
For technical support, including SC16C2550IB48,128 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC16C2550IB48,128 requirements.
6.How does Aetrix verify that SC16C2550IB48,128 is sourced from the original manufacturer or authorized distributors?
All SC16C2550IB48,128 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 SC16C2550IB48,128 meets industry standards.
7.What is the process for return or replacement of SC16C2550IB48,128?
All SC16C2550IB48,128 units undergo pre-shipment inspection (PSI). If there is an issue with SC16C2550IB48,128, 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 SC16C2550IB48,128 part is unused and in its original packaging.
Return procedure for SC16C2550IB48,128:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SC16C2550IB48,128 Tags
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