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NXP Semiconductors SC16C2552BIA44,518
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- Part No.:
- SC16C2552BIA44,518
- Manufacturer:
- NXP Semiconductors
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
SC16C2552BIA44,518.pdf
- Description:
- IC UART DUAL SOT187-2
- Quantity:
- Payment:
- Shipping:
Inventory:3,084
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Product details
Overview
SC16C2552BIA44,518 from NXP Semiconductors is a dual-channel 5 V/3.3 V/2.5 V UART IC for industrial serial communication, supporting up to 5 Mbit/s data rate at 5 V/3.3 V, featuring independent 16-byte transmit and receive FIFOs, programmable baud rate generators per channel, full modem control (CTS/RTS/DSR/DTR/RI/CD), and DMA-ready TXRDY/RXRDY signaling. It serves in embedded industrial controllers requiring high-throughput, low-CPU-overhead serial bridging between microcontrollers and modems or RS-232/RS-485 transceivers.
For engineers reviewing the SC16C2552BIA44,518 datasheet, SC16C2552BIA44,518 pinout, SC16C2552BIA44,518 application, or SC16C2552BIA44,518 equivalent, key selection criteria include dual-channel FIFO depth, voltage-flexible operation (2.5–5 V), PLCC44 package compatibility with legacy PC16552/ST16C2552 designs, interrupt prioritization logic, and register-level concurrent write capability across UART A and B.
Technical Context
The SC16C2552BIA44,518 implements two independent UART channels sharing a common 8-bit parallel bus interface with address decoding via A0–A2 and chip-select logic. Each channel features dedicated 16-byte FIFOs, separate programmable baud rate generators accepting up to 80 MHz input clocks, and full modem status/control registers (MCR/MSR) with delta-change detection on CTS/DSR/RI/CD.
It supports three operational modes: standard interrupt-driven (DMA Mode 0), block-mode DMA (DMA Mode 1) using TXRDY/RXRDY handshaking, and internal loopback for self-test. Channel selection is controlled by CHSEL under CS=0, while AFR[0] enables simultaneous register writes to both channels-critical for synchronized initialization without disrupting live traffic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | Dual independent UARTs (A and B) with separate FIFOs, baud generators, and modem control logic. |
| 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 industrial link 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, or 5 V operation - allows direct interfacing with mixed-voltage SoCs and legacy 5 V systems. |
| Interrupt Architecture | Priority-encoded ISR with four levels; supports concurrent handling of RX ready, TX empty, line errors, and modem status changes. |
| Modem Interface | Full six-signal modem control (CTS/RTS/DSR/DTR/RI/CD) with delta-change interrupts and software-controllable outputs. |
| Package | PLCC44 (SOT187-2) - surface-mount, leaded package compatible with industrial reflow and legacy socketed designs. |
Pinout & Package
SC16C2552BIA44,518 is housed in a plastic leaded chip carrier (PLCC44) package with 44 leads, footprint SOT187-2, suitable for industrial temperature range (−40 °C to +85 °C) operation and reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D0–D7 | 8-bit bidirectional data bus | Transfers register contents and data between CPU and UART; 3-state output during read/write cycles. |
| A0–A2 | Register address select | Selects internal register (THR/RHR/IER/FCR/etc.) during I/O cycles; required for accessing both general and baud rate register sets. |
| CS | Chip select (active LOW) | Enables UART access; must be LOW to activate register reads/writes or FIFO transfers. |
| CHSEL | Channel select | When CS=0, CHSEL=1 selects UART A; CHSEL=0 selects UART B; overridden by AFR[0] for concurrent writes. |
| TXA/TXB | Transmit serial outputs | Asynchronous serial data outputs per channel; driven HIGH during reset/idle; disabled in loopback mode. |
| RXA/RXB | Receive serial inputs | Asynchronous serial data inputs per channel; internally connected to TX in loopback mode. |
| INTA/INTB | Channel-specific interrupt outputs | Active-HIGH open-drain interrupts indicating pending events (RX ready, TX empty, errors, modem change). |
| TXRDYA/TXRDYB | Transmit FIFO ready indicators | Active-LOW signals indicating ≥1 empty location in TX FIFO/THR - used for DMA flow control or polling. |
| RXRDYA/RXRDYB | Receive FIFO ready indicators | Active-LOW signals indicating ≥1 character available in RX FIFO - configurable trigger level (1/4/8/14 bytes). |
| RTSA/RTSB, DTRA/DTRB | Modem control outputs | Active-LOW RTS/DTR signals controlled via MCR bits; enable handshake with external modems or transceivers. |
| CTSA/CTSB, DSRA/DSRB | Modem status inputs | Active-LOW CTS/DSR inputs monitored by MSR; generate interrupts on state change when enabled in IER. |
| XTAL1/XTAL2 | Clock input/output | Supports crystal (1.8432 MHz–24 MHz) or external clock (up to 80 MHz); XTAL2 is buffered output when crystal used. |
Key Features
| Feature | Design Value |
|---|---|
| Concurrent dual-channel register writes | AFR[0]=1 enables single-cycle writes to identical registers in UART A and B - cuts initialization time by 50% in dual-port systems. |
| Four-level RX FIFO interrupt trigger | Programmable via FCR[7:6] (1/4/8/14 bytes) - optimizes interrupt frequency vs. latency trade-off in real-time applications. |
| Multi-function output pins (MFA/MFB) | Selectable as OP2, BAUDOUT, or RXRDY - conserves PCB I/O count while enabling clock monitoring or DMA signaling. |
| Internal loopback diagnostic mode | MCR[4]=1 disconnects external pins and routes TX→RX internally - validates UART core functionality without external hardware. |
| 5 V-tolerant data bus inputs | D0–D7 accept 5 V logic even when VCC = 2.5 V or 3.3 V - simplifies interface to legacy 5 V peripherals without level shifters. |
Applications
| Industrial PLC Serial Gateway | Medical Device RS-232 Bridge |
|---|---|
Use Scenario: Connecting multiple fieldbus devices (Modbus RTU, Profibus DP slaves) to a central ARM-based controller via isolated RS-485 links. IC Role / Device Role / Timing Role: Dual UART handles simultaneous upstream telemetry and downstream command streams; FIFOs absorb bursty sensor data without CPU overload. Use Value: 16-byte FIFOs reduce interrupt frequency by >80% vs. 1-byte-buffer UARTs, freeing CPU cycles for real-time motion control tasks. | Use Scenario: Enabling bidirectional communication between an ultrasound imaging processor and legacy RS-232 diagnostic peripherals (ECG monitors, patient ID scanners). IC Role / Device Role / Timing Role: SC16C2552BIA44,518 acts as protocol-transparent serial bridge; independent baud generators allow 115.2 kbit/s imaging data and 9.6 kbit/s control commands on same device. Use Value: Concurrent A/B register writes ensure synchronized configuration of both ports during power-up, eliminating race conditions in safety-critical boot sequences. |
| Telecom Base Station Modem Interface | Automotive Telematics ECU |
Use Scenario: Interfacing 3G/LTE modems to host application processors in cellular infrastructure equipment requiring AT command parsing and data tunneling. IC Role / Device Role / Timing Role: UART A manages AT command channel; UART B handles PPP data stream; DMA-ready TXRDY/RXRDY signals coordinate zero-copy buffer transfers. Use Value: 5 Mbit/s max rate supports 33.6 kbit/s modems with data compression, while 2.5 V operation matches low-power baseband SoC I/O domains. | Use Scenario: Supporting OBD-II diagnostics and GPS/GNSS module integration in Tier-1 automotive ECUs operating across −40 °C to +85 °C. IC Role / Device Role / Timing Role: SC16C2552BIA44,518 provides isolated UART paths for J1939 CAN gateway logging and GNSS NMEA sentence parsing. Use Value: Industrial temp rating and 5 V-tolerant D-bus allow direct connection to 5 V CAN transceivers and 3.3 V GNSS modules without voltage translation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual UART applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ST16C2552CJ44 | Pin-compatible but lacks 2.5 V operation; max 3.3 V only; no 5 V-tolerant inputs. | Suitable for 3.3 V-only systems; not viable where mixed 2.5/3.3/5 V I/O coexist. | Choose ST16C2552CJ44 only if system operates exclusively at 3.3 V and does not require 5 V-tolerant bus interfacing. |
| EXAR XR16L2552IL48-F | 48-pin LQFP; supports 1.8 V–5 V; adds auto-flow control and enhanced FIFO status flags. | Better suited for space-constrained PCBs needing 1.8 V compatibility; requires layout change due to different footprint. | Select XR16L2552IL48-F when upgrading to 1.8 V logic domains or requiring automatic RTS/CTS assertion based on FIFO levels. |
Compared with ST16C2552CJ44 and XR16L2552IL48-F, SC16C2552BIA44,518 uniquely balances broad voltage support (2.5–5 V), 5 V-tolerant inputs, PLCC44 legacy compatibility, and concurrent dual-channel register access - making it optimal for industrial retrofits and mixed-voltage embedded gateways.
Availability
SC16C2552BIA44,518 is available at Aetrix Electronics and suitable for industrial PLC serial gateways, medical device RS-232 bridges, and telecom modem interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SC16C2552BIA44,518 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, power management, and RF technologies.
The SC16C2552BIA44,518 belongs to NXP's legacy industrial UART product line, designed specifically for robust, drop-in replacement of PC16552-class devices in mission-critical serial infrastructure where reliability, wide voltage operation, and backward compatibility are mandatory.
FAQ
What voltage levels does the SC16C2552BIA44,518 support, and how does that affect system design?
The SC16C2552BIA44,518 operates at 2.5 V, 3.3 V, or 5 V supply voltages and features 5 V-tolerant D0–D7 inputs. This allows direct interfacing with legacy 5 V peripherals without level shifters, while supporting modern low-voltage SoCs. System designers can deploy SC16C2552BIA44,518 in mixed-voltage environments - for example, connecting a 2.5 V FPGA to a 5 V RS-232 transceiver - reducing BOM cost and board area.
How does the SC16C2552BIA44,518 handle simultaneous configuration of both UART channels?
The SC16C2552BIA44,518 supports concurrent register writes to UART A and B via the Alternate Function Register (AFR). Setting AFR[0] = 1 overrides CHSEL and enables a single write cycle to update identical registers (e.g., LCR, FCR, IER) in both channels. This eliminates timing windows where one channel is configured while the other remains in an inconsistent state - a critical advantage in SC16C2552BIA44,518-based safety-critical boot loaders and real-time firmware.
What is the maximum serial data rate achievable with the SC16C2552BIA44,518, and what clock source is required?
The SC16C2552BIA44,518 supports up to 5 Mbit/s at 5 V or 3.3 V, and 3 Mbit/s at 2.5 V. To achieve 5 Mbit/s, the internal baud rate generator requires an input clock of up to 80 MHz - delivered either via external clock on XTAL1 or a crystal (e.g., 24 MHz) across XTAL1/XTAL2. The 16× clock divider architecture ensures precise standard rates (e.g., 115.2 kbit/s with 1.8432 MHz crystal) and custom rates via DLL/DLM register programming.
Does the SC16C2552BIA44,518 support hardware flow control, and how is it implemented?
Yes, the SC16C2552BIA44,518 fully supports hardware flow control via RTS/CTS signals per channel. RTSA/RTSB are active-LOW outputs controlled by MCR[1]; CTSA/CTSB are active-LOW inputs monitored by MSR[4]. Flow control status is readable in MSR and generates interrupts when enabled in IER[3]. Unlike auto-flow variants, SC16C2552BIA44,518 requires firmware to assert/deassert RTS based on FIFO fill level - giving developers deterministic control over handshaking timing in SC16C2552BIA44,518-based protocols.
Can the SC16C2552BIA44,518 be used in loopback mode for production testing, and what signals are involved?
Yes, the SC16C2552BIA44,518 includes an internal loopback mode activated by setting MCR[4] = 1. In this mode, TXA/TXB are disconnected from pins and routed internally to RXA/RXB, while modem pins (CTS/DSR/RI/CD) are remapped to RTS/DTR/OP2/OP1. Loopback test data is written to THR and verified by reading RHR - validating UART core functionality without external cabling. This capability is integral to SC16C2552BIA44,518-based manufacturing test suites and field diagnostics.
SC16C2552BIA44,518 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 44-LCC (J-Lead)
- 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:
- -
- 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)
SC16C2552BIA44,518 FAQ
1.How can I place an order for SC16C2552BIA44,518 through Aetrix?
Please submit a Request for Quotation (RFQ) for SC16C2552BIA44,518 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 SC16C2552BIA44,518 reliable?
The price and inventory of SC16C2552BIA44,518 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC16C2552BIA44,518 is usually 5 days.
3.What payment methods are accepted for SC16C2552BIA44,518?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC16C2552BIA44,518 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC16C2552BIA44,518?
SC16C2552BIA44,518 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC16C2552BIA44,518 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 SC16C2552BIA44,518?
For technical support, including SC16C2552BIA44,518 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC16C2552BIA44,518 requirements.
6.How does Aetrix verify that SC16C2552BIA44,518 is sourced from the original manufacturer or authorized distributors?
All SC16C2552BIA44,518 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 SC16C2552BIA44,518 meets industry standards.
7.What is the process for return or replacement of SC16C2552BIA44,518?
All SC16C2552BIA44,518 units undergo pre-shipment inspection (PSI). If there is an issue with SC16C2552BIA44,518, 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 SC16C2552BIA44,518 part is unused and in its original packaging.
Return procedure for SC16C2552BIA44,518:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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