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NXP Semiconductors SC16C2552BIA44,512
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- Part No.:
- SC16C2552BIA44,512
- Manufacturer:
- NXP Semiconductors
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
SC16C2552BIA44,512.pdf
- Description:
- IC UART DUAL SOT187-2
- Quantity:
- Payment:
- Shipping:
Inventory:4,788
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Product details
Overview
SC16C2552BIA44,512 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 transmit and receive FIFOs, programmable baud rate generators per channel, and full modem control (CTS/RTS/DSR/DTR/RI/CD). It serves as a high-throughput serial interface in industrial communication controllers and embedded networking gateways.
For engineers reviewing the SC16C2552BIA44,512 datasheet, SC16C2552BIA44,512 pinout, SC16C2552BIA44,512 application, or SC16C2552BIA44,512 equivalent, key selection considerations include dual-channel FIFO interrupt trigger configurability, DMA-ready TXRDY/RXRDY signaling, PLCC44 package compatibility with legacy PC16552 layouts, and 2.5–5 V supply flexibility for mixed-voltage system integration.
Technical Context
The SC16C2552BIA44,512 implements two independent UART channels sharing a common 8-bit parallel bus, with separate AFR-controlled multi-function pins (MFA/MFB) for BAUDOUT, RXRDY, or OP2 signaling. Each channel features dedicated DLL/DLM registers for independent TX/RX baud rate programming using divisors up to 65535, enabling precise custom rates from 50 bps to 5 Mbit/s.
Its functional architecture supports concurrent register writes to both UART sections via CHSEL override, DMA Mode 1 block transfers triggered by programmable FIFO levels (1/4/8/14 bytes), and internal loopback diagnostics with full interrupt visibility-including time-out interrupts generated after 4 character times when RHR remains unread.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | Dual independent UARTs (A and B) with separate control logic and FIFOs |
| 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 FIFO per channel - reduces CPU interrupt load and improves throughput in multi-channel systems |
| Supply Voltage | 2.5 V, 3.3 V, and 5 V operation - allows direct interfacing with mixed-voltage microcontrollers and FPGAs |
| Interrupt Flexibility | Four selectable RX FIFO trigger levels (1/4/8/14 bytes); fixed TX trigger - optimizes latency vs. bandwidth trade-offs per application |
| Modem Interface | Full six-signal modem control (CTS/RTS/DSR/DTR/RI/CD) with status change interrupts - supports hardware flow control and line monitoring |
| Crystal Support | XTAL1/XTAL2 oscillator input up to 80 MHz - accommodates standard crystals (e.g., 1.8432 MHz, 7.3728 MHz, 24 MHz) and external clocks |
Pinout & Package
SC16C2552BIA44,512 is housed in a plastic leaded chip carrier (PLCC44) package with 44 leads (SOT187-2), featuring gull-wing leads, 1.27 mm pitch, and exposed pad-less construction suitable for industrial reflow and wave soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D0–D7 | 8-bit bidirectional data bus | Transfers register data and commands between host CPU and UART core; 3-state outputs during read cycles |
| A0–A2 | Register address select | Defines internal register access (THR/RHR/IER/FCR/LCR/MCR/etc.) during IOR/IOW strobes |
| CS, CHSEL | Channel selection control | CS=0 + CHSEL=1 selects UART A; CS=0 + CHSEL=0 selects UART B; AFR[0]=1 enables simultaneous write to both |
| TXA/TXB, RXA/RXB | Serial I/O pairs | Independent full-duplex asynchronous data paths per channel; internally disconnected during loopback mode |
| INTA/INTB | Channel-specific interrupt outputs | Active-HIGH open-drain signals indicating pending RX/TX/line/modem events per UART section |
| TXRDYA/TXRDYB, RXRDYA/RXRDYB | DMA-ready status indicators | Active-LOW signals indicating TX FIFO empty space or RX FIFO data availability - used for DMA handshaking |
| RTSA/RTSB, CTSA/CTSB, DTRA/DTRB, DSRA/DSRB, RIA/RIB, CDA/CDB | Modem control I/O | Standard RS-232-compatible control lines with active-LOW polarity; monitored via MSR and controllable via MCR |
| XTAL1/XTAL2 | Crystal oscillator interface | XTAL1 accepts crystal or external clock (≤80 MHz); XTAL2 is buffered output - enables precise baud rate generation |
Key Features
| Feature | Design Value |
|---|---|
| Concurrent dual-channel register access | AFR[0] override enables single-cycle writes to identical registers across UART A and B - cuts initialization time by ~50% in dual-port setups |
| Programmable RX FIFO trigger levels | Four selectable thresholds (1/4/8/14 bytes) via FCR[7:6] - balances interrupt frequency and data latency for real-time or burst-mode applications |
| Multi-function pin capability (MFA/MFB) | Configurable as BAUDOUT (16× clock), RXRDY (DMA-ready), or OP2 (MCR[3]-controlled output) - saves PCB I/O count without sacrificing debug or timing visibility |
| Internal loopback diagnostics | Full TX→RX path test with preserved interrupt behavior (including MSR[3:0] modem flags) - validates UART functionality without external cabling |
| 5 V-tolerant data bus inputs | D0–D7 accept 5 V logic even when VCC = 2.5 V or 3.3 V - simplifies level-shifting in mixed-supply host interfaces |
Applications
| Industrial PLC Serial Gateway | Medical Device RS-232 Hub |
|---|---|
Use Scenario: Aggregating serial sensor data from multiple field devices (temperature, pressure, flow meters) into a central controller via isolated RS-232 links. IC Role / Device Role / Timing Role: Dual UART bridges two independent RS-232 ports to a single 8-bit microcontroller bus, handling simultaneous polling of Modbus RTU slaves with hardware flow control. Use Value: 16-byte FIFOs prevent data loss at 115.2 kbps under CPU interrupt latency; programmable RX trigger (8-byte) ensures deterministic response to time-critical alarms. | Use Scenario: Connecting ECG monitor, infusion pump, and patient ID scanner to a central medical terminal over legacy RS-232 interfaces. IC Role / Device Role / Timing Role: SC16C2552BIA44,512 acts as a dual-port serial concentrator, managing concurrent device handshaking (RTS/CTS) and carrier detection (CD/DSR) per port. Use Value: Independent baud rate generators allow 9600 bps for ECG and 19.2 kbps for infusion pump on same IC; 2.5 V operation matches low-power SoC host voltage domain. |
| Telecom Base Station Management | Test Equipment Control Module |
Use Scenario: Providing out-of-band management console access and modem-based firmware update capability in LTE small cell base stations. IC Role / Device Role / Timing Role: UART A handles local console debugging (115.2 kbps), while UART B manages 3G/4G modem AT command interface (460.8 kbps) with full modem signal monitoring. Use Value: DMA-ready TXRDY/RXRDY signals enable zero-CPU-overhead data streaming; internal loopback validates UART integrity during factory calibration. | Use Scenario: Integrating serial instrument control (oscilloscopes, power supplies) into automated test racks with centralized FPGA-based sequencer. IC Role / Device Role / Timing Role: SC16C2552BIA44,512 serves as a dual-channel command/response interface, synchronizing SCPI command bursts and parsing ASCII responses with error flag visibility. Use Value: Four RX trigger levels let FPGA pre-load command buffers at 14-byte depth; LSR[1:0] overrun/break flags detect instrument timeout or cable disconnect. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual UART applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ST16C2552CJ44 | Same pinout and register set; operates only at 5 V (no 3.3 V/2.5 V support); max data rate 3 Mbit/s | Suitable for legacy 5 V-only designs; lacks mixed-voltage flexibility and high-speed capability of SC16C2552BIA44,512 | Select when cost sensitivity outweighs voltage scalability and speed requirements |
| EXAR XR16L2552IL44-F | Pin-compatible PLCC44 package; adds automatic hardware flow control (auto-RTS/CTS); supports 5 V tolerant I/O at 3.3 V supply | Better suited for dynamic flow-controlled modems; includes enhanced FIFO status bits not present in SC16C2552BIA44,512 | Choose when modem interoperability and reduced driver complexity are critical |
Compared with ST16C2552CJ44 and XR16L2552IL44-F, SC16C2552BIA44,512 uniquely delivers triple-voltage operation (2.5/3.3/5 V), 5 Mbit/s capability, and concurrent dual-channel register writes - making it optimal for next-generation industrial gateways requiring power efficiency, speed, and software initialization efficiency.
Availability
SC16C2552BIA44,512 is available at Aetrix Electronics and suitable for industrial automation gateways, medical device serial hubs, telecom management modules, and automated test equipment requiring stable component supply across extended temperature ranges (−40 °C to +85 °C).
Supply support for SC16C2552BIA44,512 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 interface, RF, and mixed-signal IC design.
The SC16C2552BIA44,512 belongs to NXP's legacy UART product line designed for robust, drop-in replacement of industry-standard 16C550/16C450 derivatives in mission-critical serial infrastructure where reliability, long-term availability, and backward compatibility are essential.
FAQ
What voltage levels does the SC16C2552BIA44,512 support, and how does that affect system design?
The SC16C2552BIA44,512 operates at 2.5 V, 3.3 V, and 5 V supply voltages, with 5 V-tolerant D0–D7 inputs. This allows direct connection to legacy 5 V microcontrollers while powering the IC from a modern 3.3 V or 2.5 V rail - eliminating level shifters in mixed-voltage designs and reducing BOM cost and board space. The SC16C2552BIA44,512 maintains full functionality including 5 Mbit/s data rate at 3.3 V and 3 Mbit/s at 2.5 V.
How does the SC16C2552BIA44,512 handle dual-channel interrupt management?
The SC16C2552BIA44,512 provides two independent interrupt outputs - INTA for UART channel A and INTB for UART channel B - each configurable via their respective Interrupt Enable Registers (IER). Priority is resolved per channel (RX ready > TX empty > line status > modem status), and interrupts remain active until the corresponding status bit in ISR is cleared by reading the associated register. This prevents masking of lower-priority events within the same channel.
Can the SC16C2552BIA44,512 be used with an external clock instead of a crystal, and what is the maximum input frequency?
Yes, the SC16C2552BIA44,512 accepts an external clock up to 80 MHz applied to the XTAL1 pin, bypassing the internal oscillator. This enables precise baud rate generation for non-standard data rates (e.g., 460.8 kbps for ISDN) and eliminates crystal layout constraints. XTAL2 must be left unconnected in external clock mode. The SC16C2552BIA44,512 divides this input by 16 internally before applying the programmed divisor (1–65535) to generate the final baud rate.
What is the purpose of the CHSEL and AFR[0] pins in the SC16C2552BIA44,512, and how do they interact?
CHSEL selects UART channel A (CHSEL=1) or B (CHSEL=0) when CS=0. AFR[0], when set to logic 1, overrides CHSEL to enable simultaneous writes to identical registers in both UART A and B - e.g., writing one value to LCR configures word length and parity for both channels in a single bus cycle. This feature accelerates initialization but requires caution: modifying active registers mid-transfer may disrupt ongoing serial communication on either channel.
Does the SC16C2552BIA44,512 support automatic hardware flow control like RTS/CTS, and how is it implemented?
The SC16C2552BIA44,512 provides full manual RTS/CTS control via MCR and MSR registers but does not implement automatic (self-managed) RTS assertion based on FIFO state. RTS is driven by software setting MCR[1]; CTS is monitored via MSR[4]. Flow control logic must be implemented in host firmware - for example, asserting RTS when TX FIFO occupancy exceeds threshold, and pausing transmission upon CTS deassertion. This gives designers full determinism over timing-critical handshake behavior.
SC16C2552BIA44,512 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:
- -
- 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)
SC16C2552BIA44,512 FAQ
1.How can I place an order for SC16C2552BIA44,512 through Aetrix?
Please submit a Request for Quotation (RFQ) for SC16C2552BIA44,512 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 SC16C2552BIA44,512 reliable?
The price and inventory of SC16C2552BIA44,512 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC16C2552BIA44,512 is usually 5 days.
3.What payment methods are accepted for SC16C2552BIA44,512?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC16C2552BIA44,512 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC16C2552BIA44,512?
SC16C2552BIA44,512 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC16C2552BIA44,512 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 SC16C2552BIA44,512?
For technical support, including SC16C2552BIA44,512 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC16C2552BIA44,512 requirements.
6.How does Aetrix verify that SC16C2552BIA44,512 is sourced from the original manufacturer or authorized distributors?
All SC16C2552BIA44,512 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 SC16C2552BIA44,512 meets industry standards.
7.What is the process for return or replacement of SC16C2552BIA44,512?
All SC16C2552BIA44,512 units undergo pre-shipment inspection (PSI). If there is an issue with SC16C2552BIA44,512, 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 SC16C2552BIA44,512 part is unused and in its original packaging.
Return procedure for SC16C2552BIA44,512:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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