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NXP Semiconductors SC16C2550IB48,151
- Part No.:
- SC16C2550IB48,151
- Manufacturer:
- NXP Semiconductors
- Package:
- 48-LQFP
- Datasheet:
-
SC16C2550IB48,151.pdf
- Description:
- IC UART DUAL W/FIFO 48-LQFP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SC16C2550IB48,151 from NXP Semiconductors (formerly Philips) is a dual-channel UART IC with 16-byte transmit and receive FIFOs, integrated IrDA encoder/decoder, and independent programmable baud rate generators for each channel. It operates at 5 V, 3.3 V, or 2.5 V, supports up to 5 Mbits/s data rates (at 5 V/3.3 V), and targets industrial serial communication in embedded controllers, modems, and network interface cards.
For engineers reviewing the SC16C2550IB48,151 datasheet, SC16C2550IB48,151 pinout, SC16C2550IB48,151 application, or SC16C2550IB48,151 equivalent, key selection considerations include dual-channel FIFO depth, hardware/software flow control support, IrDA physical layer compatibility, LQFP48 package footprint, and register-level software compatibility with legacy 16C2450 and INS8250 devices.
Technical Context
The SC16C2550IB48,151 implements two fully independent UART channels (A and B), each with dedicated 16-byte FIFOs, separate TX/RX baud rate generation, and full modem control logic (CTS/RTS/DSR/DTR/RI/DCD). Its internal architecture includes dual register sets accessible via A0–A2 address lines and chip-select pins CSA/CSB, enabling concurrent configuration and data transfer per channel.
It supports DMA Mode 0 (interrupt-driven) and DMA Mode 1 (block-transfer), using TXRDYA/TXRDYB and RXRDYA/RXRDYB active-low status signals-available only on PLCC44 and LQFP48 packages-to synchronize external DMA controllers. The device also integrates false start-bit detection, line break generation/detection, and prioritized interrupt handling with configurable trigger levels for receive FIFO interrupts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | Dual independent UARTs (A and B) with separate registers, FIFOs, and control logic. |
| FIFO Depth | 16-byte transmit and 16-byte receive FIFO per channel-reduces CPU interrupt load by extending service intervals up to 1.53 ms at 115.2 kbit/s. |
| Max Data Rate | 5 Mbits/s at 5 V or 3.3 V supply; 3 Mbits/s at 2.5 V-enables high-speed modem and ISDN interface applications. |
| Supply Voltage | 2.5 V / 3.3 V / 5 V operation-supports mixed-voltage system integration without level-shifting. |
| IrDA Support | Integrated IrDA 1.0 encoder/decoder-eliminates need for external SIR PHY components in infrared serial links. |
| Interrupt Architecture | Prioritized, individually maskable interrupts per channel (TX empty, RX ready, line status, modem status)-enables deterministic real-time response. |
| Flow Control | Hardware (CTS/RTS auto-handshaking) and software (Xon/Xoff 1- or 2-character) modes-ensures reliable data transfer under variable buffer conditions. |
Pinout & Package
LQFP48 package (7 × 7 × 1.4 mm body, SOT313-2); 48-pin quad flat leaded package with exposed thermal pad (not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D0–D7 | Bi-directional data bus | 8-bit parallel interface to host CPU; 3-state TTL-compatible for shared bus systems. |
| A0–A2 | Address select inputs | Select internal register address (THR/RHR, IER, FCR, LCR, etc.) within each UART channel's register set. |
| CSA / CSB | Channel-select chip enables | Active-low enables for UART A and B independently-allows simultaneous access to both channels via separate chip selects. |
| TXA / TXB | Transmit serial outputs | Asynchronous serial output signals for channel A and B; logic 1 during idle/reset; compatible with RS-232/RS-485 drivers. |
| RXA / RXB | Receive serial inputs | Asynchronous serial input signals for channel A and B; include false start-bit detection and line-break recognition. |
| INTA / INTB | Channel-specific interrupt outputs | Active-high, 3-state interrupt flags indicating pending events (RX ready, TX empty, error, modem status) per channel. |
| TXRDYA / TXRDYB | Transmit-ready status | Active-low signal indicating ≥1 empty location in TX FIFO/THR-used for DMA mode 1 handshaking or polling efficiency. |
| RXRDYA / RXRDYB | Receive-ready status | Active-low signal indicating ≥1 character available in RX FIFO/RHR-enables precise DMA block transfers aligned to FIFO trigger levels. |
| XTAL1 / XTAL2 | Clock input/output | Supports crystal oscillator (1–80 MHz) or external clock source; enables programmable baud rates from DC to 1.5 Mbit/s. |
| RTSA / RTSB | Request-to-send outputs | Active-low modem control outputs-automatically asserted when RX FIFO reaches programmed trigger level (Auto RTS). |
| CTSA / CTSB | Clear-to-send inputs | Active-low modem control inputs-suspend TX when asserted (Auto CTS), supporting hardware flow control without CPU intervention. |
Key Features
| Feature | Design Value |
|---|---|
| Four selectable RX FIFO trigger levels | Configurable interrupt thresholds (1/4/8/14 characters) optimize interrupt frequency vs. latency trade-off in multi-channel systems. |
| Independent TX/RX baud rate control | Each channel uses separate DLL/DLM divisor registers-enables asymmetric full-duplex communication (e.g., different modem speeds). |
| Internal loop-back diagnostics | Software-enabled self-test isolates link-layer faults without external cabling-validates UART functionality during boot or maintenance. |
| Sleep mode | Reduces power consumption during idle periods while preserving register state-critical for battery-powered serial gateways. |
| Programmable Xon/Xoff characters | Customizable 1- or 2-byte software flow control tokens-prevents buffer overflow in legacy protocol stacks without hardware modification. |
Applications
| Industrial PLC Serial Gateway | Legacy Modem Interface Card |
|---|---|
Use Scenario: Connecting multiple RS-485 field devices to a central controller via isolated dual-port serial bridge. IC Role / Device Role / Timing Role: Dual UART handles concurrent Modbus RTU master/slave traffic on separate channels with independent timing and FIFO buffering. Use Value: 16-byte FIFOs reduce CPU interrupt overhead by >90% versus 1-byte-buffer UARTs, enabling deterministic scan cycles in real-time PLC firmware. | Use Scenario: Retrofitting ISA/PCI modem cards with high-speed V.34/V.90 support in telecom test equipment. IC Role / Device Role / Timing Role: UART A manages AT command channel; UART B handles high-speed data path with IrDA SIR physical layer for infrared diagnostics. Use Value: 5 Mbit/s capability and Auto RTS/CTS eliminate data loss during burst transfers from 33.6 kbit/s+ modems, improving test throughput. |
| Embedded Network Router Console | Medical Device Serial Debug Port |
Use Scenario: Providing simultaneous CLI access and out-of-band management on enterprise routers via dual RJ-45 serial ports. IC Role / Device Role / Timing Role: One UART serves as primary console port; second UART supports secure firmware update channel with hardware flow control. Use Value: Independent baud rate generators allow 115.2 kbit/s CLI and 921.6 kbit/s firmware streaming concurrently-no timing conflict or shared clock dependency. | Use Scenario: Enabling certified serial debug and configuration interface on FDA-cleared patient monitors with strict EMI requirements. IC Role / Device Role / Timing Role: UART provides isolated RS-232 debug port with IrDA fallback; sleep mode minimizes standby current during clinical operation. Use Value: 2.5 V/3.3 V operation and industrial temperature range (−40°C to +85°C) ensure reliability in low-power, thermally constrained medical enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual UART applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ST16C2550IPQ44 | PLCC44 package; identical register map and pinout for UART A/B functions but lacks IrDA encoder/decoder. | No infrared physical layer support-requires external IrDA transceiver for SIR compliance. | Select when IrDA is unnecessary and PLCC44 footprint is preferred for legacy board reuse. |
| EXAR XR16L2550IL48-F | LQFP48 package; adds 1.8 V I/O support and enhanced ESD protection (±15 kV HBM), but no IrDA function. | Lower voltage operation enables direct interfacing with modern 1.8 V SoCs; no infrared capability limits use in IR-enabled medical/kiosk systems. | Choose for new designs requiring 1.8 V compatibility and higher ESD robustness where IrDA is not required. |
Compared with ST16C2550IPQ44 and XR16L2550IL48-F, the SC16C2550IB48,151 uniquely integrates IrDA 1.0 encoding/decoding in an LQFP48 package while maintaining full software compatibility with 16C2450-making it the only drop-in solution for infrared-capable dual-UART applications requiring industrial temperature range and 2.5–5 V flexibility.
Availability
SC16C2550IB48,151 is available at Aetrix Electronics and suitable for industrial PLC gateways, legacy modem interface cards, embedded network router consoles, and medical device debug ports requiring stable component supply across extended product lifecycles.
Supply support for SC16C2550IB48,151 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 roots in Philips' semiconductor division.
The SC16C2550IB48,151 belongs to NXP's legacy industrial UART product line, designed specifically for high-reliability serial communication in environments demanding long-term availability, wide voltage operation, and backward compatibility with 16C2450-based systems.
FAQ
What is the maximum data rate supported by the SC16C2550IB48,151?
The SC16C2550IB48,151 supports up to 5 Mbits/s at 5 V or 3.3 V supply voltage, and 3 Mbits/s at 2.5 V. This performance is achieved using an 80 MHz internal clock divider and requires full-rail-swing clock input. The actual achievable rate depends on external crystal or clock source stability and PCB layout integrity-verified in application note AN10322 for LQFP48 layout guidelines.
Does the SC16C2550IB48,151 support IrDA communication natively?
Yes, the SC16C2550IB48,151 integrates a complete IrDA 1.0 encoder/decoder compliant with SIR (Serial Infrared) physical layer specifications. It directly drives standard IrDA transceivers like the Vishay TFBS4650 without external logic, enabling 115.2 kbit/s infrared serial links for remote configuration and diagnostics in the SC16C2550IB48,151-based design.
How does the SC16C2550IB48,151 handle dual-channel interrupt management?
The SC16C2550IB48,151 provides independent INTA and INTB outputs with prioritized, maskable interrupt sources per channel-including RX ready, TX empty, line status, and modem status. Each channel's interrupt enable register (IER) allows selective activation, and the interrupt status register (ISR) reports the highest-priority pending condition-ensuring deterministic servicing in time-critical SC16C2550IB48,151 implementations.
Can the SC16C2550IB48,151 operate with a 1.8432 MHz crystal?
Yes, the SC16C2550IB48,151 supports 1.8432 MHz crystals via XTAL1/XTAL2 pins and delivers standard baud rates including 9600, 19200, 38400, 57600, and 115200 bit/s. The device's programmable baud rate generator uses DLL/DLM registers to configure divisors, and Table 6 in the official datasheet confirms exact divisor values for 1.8432 MHz operation in the SC16C2550IB48,151.
Is the SC16C2550IB48,151 pin-compatible with the ST16C2550?
Yes, the SC16C2550IB48,151 is explicitly documented as pin-compatible with the ST16C2550 in LQFP48 package. Both share identical pin assignments for D0–D7, CSA/CSB, TXA/TXB, RXA/RXB, INTA/INTB, and all control signals. However, the SC16C2550IB48,151 adds IrDA functionality not present in the ST16C2550, requiring verification of unused pins in legacy ST16C2550 designs before substitution.
SC16C2550IB48,151 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:
- Yes
- With False Start Bit Detection:
- Yes
- With Modem Control:
- Yes
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-LQFP (7x7)
SC16C2550IB48,151 FAQ
1.How can I place an order for SC16C2550IB48,151 through Aetrix?
Please submit a Request for Quotation (RFQ) for SC16C2550IB48,151 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 SC16C2550IB48,151 reliable?
The price and inventory of SC16C2550IB48,151 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC16C2550IB48,151 is usually 5 days.
3.What payment methods are accepted for SC16C2550IB48,151?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC16C2550IB48,151 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC16C2550IB48,151?
SC16C2550IB48,151 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC16C2550IB48,151 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 SC16C2550IB48,151?
For technical support, including SC16C2550IB48,151 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC16C2550IB48,151 requirements.
6.How does Aetrix verify that SC16C2550IB48,151 is sourced from the original manufacturer or authorized distributors?
All SC16C2550IB48,151 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 SC16C2550IB48,151 meets industry standards.
7.What is the process for return or replacement of SC16C2550IB48,151?
All SC16C2550IB48,151 units undergo pre-shipment inspection (PSI). If there is an issue with SC16C2550IB48,151, 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 SC16C2550IB48,151 part is unused and in its original packaging.
Return procedure for SC16C2550IB48,151:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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