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NXP Semiconductors SC16C2550BIA44,529
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- Part No.:
- SC16C2550BIA44,529
- Manufacturer:
- NXP Semiconductors
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
SC16C2550BIA44,529.pdf
- Description:
- IC UART DUAL W/FIFO 44-PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,497
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Product details
Overview
SC16C2550BIA44,529 from NXP Semiconductors is a dual-channel 5 V/3.3 V/2.5 V UART IC supporting up to 5 Mbit/s data rate, featuring independent 16-byte TX/RX FIFOs, programmable baud rate generators, and full modem control (CTS/RTS/DSR/DTR/RI/CD) for industrial serial communication interfaces.
For engineers reviewing the SC16C2550BIA44,529 datasheet, SC16C2550BIA44,529 pinout, SC16C2550BIA44,529 application, or SC16C2550BIA44,529 equivalent, this device serves as a drop-in upgrade to ST16C2450 with enhanced interrupt prioritization, DMA-ready RXRDY/TXRDY signaling, and flexible voltage operation across embedded control, industrial gateways, and legacy RS-232/RS-485 adapter designs.
Technical Context
The SC16C2550BIA44,529 implements two independent UART channels (A and B), each with dedicated register sets accessible via A0–A2 address lines and CSA/CSB chip selects. Its internal architecture includes separate transmit/receive shift registers, 16-byte FIFO buffers, and a shared 16× clock divider for baud rate generation up to 5 Mbit/s at 5 V.
Hardware flow control is implemented through active-low CTS/RTS pins per channel, while modem status monitoring uses DSR/CD/RI inputs and DTR/RTS outputs controlled by the Modem Control Register (MCR). Loopback mode isolates TX/RX paths internally for diagnostics without external wiring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | Dual independent UARTs (Channel A and Channel B) |
| 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 network interface support |
| FIFO Depth | 16-byte transmit and receive FIFOs - reduces CPU interrupt load by extending service intervals to 1.53 ms at 115.2 kbit/s |
| Supply Voltage | 2.5 V / 3.3 V / 5 V operation - supports mixed-voltage system integration and legacy board upgrades |
| Interrupt System | Prioritized, independently enabled TXRDY/RXRDY, line status, and modem interrupts - allows deterministic real-time response in multi-channel environments |
| Package | PLCC44 (SOT187-2) - surface-mount compatible with industrial temperature range (−40 °C to +85 °C) |
| Baud Rate Flexibility | Programmable divisor (1–65535) with 1.8432 MHz reference - supports standard rates from 50 bit/s to 115.2 kbit/s and custom values |
Pinout & Package
SC16C2550BIA44,529 is housed in a 44-pin plastic leaded chip carrier (PLCC44, SOT187-2) with gull-wing leads and a 1.27 mm pitch. The package supports reflow soldering and meets industrial thermal requirements (−40 °C to +85 °C).
| 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, LSR, SPR |
| CSA / CSB | Chip select (active LOW) | Enable UART Channel 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 parallel data transfer with host CPU; LSB-aligned for character framing |
| INTA / INTB | Channel-specific interrupt outputs | Active-LOW open-drain signals indicating pending TX/RX/line/modem events per channel; configurable priority |
| RXA / RXB | Serial receive inputs | Asynchronous input pins accepting TTL-level serial data; internally synchronized and framed with start/stop/parity bits |
| TXA / TXB | Serial transmit outputs | TTL-level serial output pins; driven only when transmitter is enabled and THR/FIFO contains data |
| RESET | Active-HIGH reset input | Clears all internal registers, disables TX/RX paths, and forces INTA/INTB high; initializes device to ST16C2450 compatibility mode |
| XTAL1 / XTAL2 | Crystal oscillator interface | Supports 1.8432 MHz crystal (for 115.2 kbit/s) or external clock up to 80 MHz; XTAL2 is buffered output |
| CTSA / CTSB | Clear-to-send inputs | Hardware flow control inputs per channel; logic LOW indicates modem readiness to accept transmit data |
| RTSA / RTSB | Request-to-send outputs | Modem control outputs per channel; logic LOW signals data availability to remote device; controlled by MCR[1] |
| RXRDYA / RXRDYB | FIFO ready outputs | Active-LOW signals indicating ≥1 byte available in RX FIFO; used for DMA trigger or polling efficiency in PLCC44/LQFP48 packages |
| TXRDYA / TXRDYB | FIFO ready outputs | Active-LOW signals indicating ≥1 empty location in TX FIFO; enables burst-mode DMA transfers in PLCC44/LQFP48 packages |
Key Features
| Feature | Design Value |
|---|---|
| Independent TX/RX baud rate control | Single programmable 16× clock divider supports different transmit/receive rates per channel via DLL/DLM registers |
| Four selectable RX FIFO trigger levels | Configurable interrupt thresholds (1/4/8/14 bytes) optimize interrupt frequency vs. latency trade-offs in multi-channel systems |
| Internal loopback diagnostic mode | Enables full TX/RX path validation without external cabling; isolates hardware faults during production test or field maintenance |
| False start-bit detection | Prevents spurious character framing errors caused by noise on RX lines; improves reliability in electrically noisy industrial environments |
| 3-state TTL drive capability | Allows direct connection to shared 8-bit data buses without external bus transceivers; reduces BOM count and layout complexity |
| Software-compatible initialization | Power-up default state matches ST16C2450 register map and behavior, enabling drop-in replacement without firmware changes |
Applications
| Industrial PLC Serial Interface | Legacy Equipment Adapter Board |
|---|---|
Use Scenario: Connecting microcontroller-based PLC CPUs to RS-232/RS-485 field devices using discrete level-shifting circuitry. IC Role / Device Role / Timing Role: Dual UART bridges parallel bus to two independent serial links; handles framing, parity, and baud rate conversion. Use Value: 16-byte FIFOs reduce interrupt overhead by 93% vs. non-FIFO UARTs, enabling deterministic scan cycle timing in real-time control loops. |
Use Scenario: Retrofitting vintage CNC machines or lab instruments with modern USB-to-serial host controllers. IC Role / Device Role / Timing Role: Provides dual asynchronous serial ports with full modem handshaking for backward-compatible RS-232 connectivity. Use Value: Pin compatibility with ST16C2450 allows PCB reuse; 2.5 V/3.3 V/5 V support simplifies integration with mixed-voltage adapter logic. |
| Multi-Port Terminal Server | Embedded Network Gateway |
Use Scenario: Aggregating serial console access from multiple servers into a single Ethernet-connected management unit. IC Role / Device Role / Timing Role: Two independent UART channels serve as dedicated serial I/O engines, each with DMA-ready RXRDY/TXRDY signaling. Use Value: Four RX FIFO trigger levels allow fine-grained interrupt tuning per port, maximizing throughput under asymmetric traffic loads. |
Use Scenario: Bridging CAN or Modbus RTU field networks to TCP/IP backbone in smart grid or building automation nodes. IC Role / Device Role / Timing Role: Handles protocol translation between serial fieldbus and host processor; manages time-critical framing and error recovery. Use Value: Internal loopback mode validates UART integrity during boot-up; false start-bit detection prevents corrupted command parsing in noisy substations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual UART applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ST16C2550IB48 | Same functional spec, but in LQFP48 package with n.c. pins at positions 12/24/25/37; no RXRDY/TXRDY on HVQFN32 variant | LQFP48 footprint requires PCB redesign; identical register set and timing behavior enable firmware reuse | Select when board space permits larger package and LQFP reflow compatibility is preferred over PLCC |
| SC16C2552BIA44 | Enhanced version with 64-byte FIFOs, higher max clock (100 MHz), and additional GPIOs; not pin-compatible | Requires firmware updates for extended FIFO handling and new register bits; supports >5 Mbit/s in 5 V mode | Choose for future-proofing high-throughput applications where interrupt reduction beyond 16-byte FIFOs is critical |
Compared with ST16C2550IB48, SC16C2550BIA44,529 offers identical functionality in PLCC44 for drop-in replacement on legacy boards; versus SC16C2552BIA44, it trades deeper FIFOs and higher speed for proven stability and minimal firmware impact in cost-sensitive industrial deployments.
Availability
SC16C2550BIA44,529 is available at Aetrix Electronics and suitable for industrial PLC serial interfaces, legacy equipment adapter boards, multi-port terminal servers, and embedded network gateways requiring stable component supply across extended product lifecycles.
Supply support for SC16C2550BIA44,529 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 deep expertise in mixed-signal and interface IC design.
The SC16C2550BIA44,529 belongs to NXP's legacy UART product line engineered for robust serial communication in harsh industrial environments, emphasizing long-term availability, wide voltage operation, and backward compatibility with industry-standard register maps.
FAQ
What voltage levels does SC16C2550BIA44,529 support?
SC16C2550BIA44,529 operates at 2.5 V, 3.3 V, and 5 V supply voltages, with 5 V tolerance on input-only pins (D7–D0). This triple-voltage capability allows seamless integration into mixed-voltage systems and simplifies upgrades from legacy 5 V designs without level-shifter components.
Is SC16C2550BIA44,529 pin-compatible with ST16C2450?
Yes, SC16C2550BIA44,529 is pin-compatible with ST16C2450 and powers up to be functionally equivalent. It retains identical pin assignments for D0–D7, A0–A2, CSA/CSB, IOR/IOW, RESET, INTA/INTB, TXA/TXB, RXA/RXB, and modem control signals, enabling direct replacement on existing PCBs.
How does the 16-byte FIFO improve system performance in SC16C2550BIA44,529?
The 16-byte transmit and receive FIFOs in SC16C2550BIA44,529 extend the CPU interrupt service interval from 93 µs (ST16C2450 at 115.2 kbit/s) to 1.53 ms. This reduces interrupt overhead by over 93%, freeing the host processor for higher-priority tasks in real-time industrial control applications.
What are the key differences between SC16C2550BIA44,529 and SC16C2552BIA44?
SC16C2552BIA44 features 64-byte FIFOs, 100 MHz max clock, and additional GPIOs but is not pin-compatible with SC16C2550BIA44,529. Firmware modifications are required to leverage extended FIFO depth and new register bits, making SC16C2550BIA44,529 preferable for drop-in replacements.
Does SC16C2550BIA44,529 support hardware flow control?
Yes, SC16C2550BIA44,529 provides full hardware flow control per channel via dedicated CTSA/CTSB (input) and RTSA/RTSB (output) pins. These signals are directly managed by the Modem Control Register (MCR) and reflected in the Modem Status Register (MSR) for software monitoring.
SC16C2550BIA44,529 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 44-LCC (J-Lead)
- Series:
- -
- Packaging:
- Tube
- 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:
- 44-PLCC (16.59x16.59)
SC16C2550BIA44,529 FAQ
1.How can I place an order for SC16C2550BIA44,529 through Aetrix?
Please submit a Request for Quotation (RFQ) for SC16C2550BIA44,529 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 SC16C2550BIA44,529 reliable?
The price and inventory of SC16C2550BIA44,529 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC16C2550BIA44,529 is usually 5 days.
3.What payment methods are accepted for SC16C2550BIA44,529?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC16C2550BIA44,529 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC16C2550BIA44,529?
SC16C2550BIA44,529 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC16C2550BIA44,529 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 SC16C2550BIA44,529?
For technical support, including SC16C2550BIA44,529 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC16C2550BIA44,529 requirements.
6.How does Aetrix verify that SC16C2550BIA44,529 is sourced from the original manufacturer or authorized distributors?
All SC16C2550BIA44,529 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 SC16C2550BIA44,529 meets industry standards.
7.What is the process for return or replacement of SC16C2550BIA44,529?
All SC16C2550BIA44,529 units undergo pre-shipment inspection (PSI). If there is an issue with SC16C2550BIA44,529, 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 SC16C2550BIA44,529 part is unused and in its original packaging.
Return procedure for SC16C2550BIA44,529:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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