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NXP Semiconductors SC16C752BIB48,151
- Part No.:
- SC16C752BIB48,151
- Manufacturer:
- NXP Semiconductors
- Package:
- 48-LQFP
- Datasheet:
-
SC16C752BIB48,151.pdf
- Description:
- IC DUAL UART 64BYTE 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,470
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Product details
Overview
SC16C752BIB48,151 from NXP Semiconductors is a dual-channel UART IC supporting 5 V, 3.3 V, and 2.5 V operation with 64-byte transmit/receive FIFOs, programmable hardware/software flow control, and up to 5 Mbit/s data rate at 5 V. It serves as a serial interface bridge in industrial controllers, embedded communication gateways, and multi-port terminal servers.
For engineers reviewing the SC16C752BIB48,151 datasheet, SC16C752BIB48,151 pinout, SC16C752BIB48,151 application, or SC16C752BIB48,151 equivalent, key selection factors include dual-channel FIFO depth, auto-RTS/CTS trigger level programming via TCR, 48-pin LQFP package compatibility, and support for 5-bit to 8-bit character framing with selectable parity and stop bits.
Technical Context
The SC16C752BIB48,151 implements two independent UART channels (A and B) with fully separate register sets, interrupt lines (INTA/INTB), and modem control signals (RTS/CTS/DTR/DSR/RI/CD). Each channel features a dedicated 64-byte FIFO with independently programmable trigger levels via FCR and TLR registers.
Its baud rate generator uses a programmable 16-bit divisor with optional prescaler (÷4), enabling precise timing across input clock frequencies. Hardware flow control operates through auto-RTS (activated when RX FIFO falls below halt level in TCR[3:0]) and auto-CTS (disabling TX when CTSn deasserts mid-stop-bit), eliminating overrun errors without CPU intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | Dual independent UARTs (A and B) with separate I/O, interrupts, and modem control |
| Max Data Rate | 5 Mbit/s at 5 V supply; 3 Mbit/s at 2.5 V - enables high-speed serial links in industrial PLCs |
| FIFO Depth | 64-byte TX and RX FIFO per channel - reduces CPU interrupt load by >95% vs. 16-byte FIFOs |
| Flow Control | Hardware (auto-RTS/auto-CTS) and software (Xon/Xoff) with programmable trigger thresholds |
| Interface Voltage | 5 V tolerant on D0–D7 bus pins; supports mixed-voltage system integration |
| Operating Temp | −40 °C to +85 °C - qualified for industrial automation and outdoor telecom equipment |
| Power Supply | Supports 5 V, 3.3 V, and 2.5 V operation - simplifies migration across legacy and modern designs |
Pinout & Package
LQFP48 package (7 × 7 × 1.4 mm, SOT313-2); 48-pin quad flat with exposed pad not specified in datasheet. Pin functions validated per NXP Rev. 6.1 datasheet Figures 2 and Table 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D0–D7 | 8-bit bidirectional data bus | Connects to microcontroller or FPGA parallel bus; 5 V tolerant for legacy host interfacing |
| A0–A2 | Register address select | Decodes internal register access (e.g., THR, RHR, IER, FCR) within each UART channel |
| CSA / CSB | Channel-select chip enable | Enables register access to UART A or B independently - supports shared bus architectures |
| TXA / TXB | Serial transmit outputs | Drive RS-232/RS-485 transceivers; logic-level output compatible with standard line drivers |
| RXA / RXB | Serial receive inputs | Accept TTL/CMOS-level serial data; disabled during local loopback mode |
| RTSA / RTSB | Hardware flow control outputs | Auto-controlled RTS signals - assert when RX FIFO has space, deassert at halt threshold (TCR[3:0]) |
| CTSA / CTSB | Hardware flow control inputs | Gate transmission - TX halts if CTSn deasserts before mid-stop-bit of current byte |
| INTA / INTB | Priority-encoded interrupt outputs | Active-HIGH per-channel interrupts; six priority levels mapped in IIR[5:0] for deterministic ISR handling |
| RXRDYA / RXRDYB | FIFO status indicators | Active-LOW signals indicating ≥1 byte in RX FIFO - used for DMA request or polling efficiency |
| TXRDYA / TXRDYB | FIFO status indicators | Active-LOW when TX FIFO has ≥1 free space - enables burst DMA writes without overflow risk |
| RESET | Asynchronous reset input | Active-HIGH; clears all registers except DLL/DLM/XON1/XON2/XOFF1/XOFF2 - ensures known startup state |
| XTAL1 / XTAL2 | Clock source interface | Supports crystal (1–25 MHz) or external clock; internal oscillator enables standalone timing without PLL |
Key Features
| Feature | Design Value |
|---|---|
| 64-byte dual FIFOs with error flags | Reduces interrupt frequency by 4× vs. 16-byte FIFOs; receiver FIFO stores 3-bit error status per byte |
| Programmable TCR-based RTS control | Halt/resume thresholds configurable per channel - prevents buffer overrun in asymmetric data flows |
| Independent INTA/INTB with prioritized IIR | Enables concurrent servicing of UART A and B without masking or latency stacking |
| False start bit detection | Rejects spurious noise-induced framing errors - improves reliability in electrically noisy factory floors |
| Internal loopback mode | Validates UART functionality without external cabling - accelerates bring-up and diagnostics |
Applications
| Industrial PLC Serial Gateway | Multi-Port Terminal Server |
|---|---|
Use Scenario: Connecting legacy RS-232 field devices (sensors, HMIs, drives) to a central EtherNet/IP controller via isolated serial ports. IC Role / Device Role / Timing Role: Dual UART bridges parallel CPU bus to two independent serial streams; handles protocol framing, flow control, and error recovery. Use Value: 64-byte FIFOs absorb bursty Modbus RTU traffic; auto-RTS/CTS prevents data loss during variable scan cycles. | Use Scenario: Aggregating console access from 20+ network switches/routers onto a single management server using RS-232-to-TCP tunneling. IC Role / Device Role / Timing Role: Provides two high-throughput UART channels feeding into a Linux-based serial multiplexer ASIC or FPGA. Use Value: 5 Mbit/s capability supports fast firmware uploads; software Xon/Xoff allows dynamic throttling per port without hardware changes. |
| Medical Diagnostic Equipment Interface | Automated Test Equipment (ATE) Controller |
Use Scenario: Interfacing ultrasound probe calibration modules and ECG signal analyzers requiring deterministic serial handshaking. IC Role / Device Role / Timing Role: UART A handles real-time sensor telemetry; UART B manages configuration commands and firmware updates. Use Value: Independent trigger levels (TLR/FCR) let telemetry use low-latency 8-byte RXRDY, while updates use full 64-byte buffering. | Use Scenario: Controlling multiple DUTs (devices under test) via RS-232 command sequences in production-line burn-in systems. IC Role / Device Role / Timing Role: Dual UART acts as command dispatcher - one channel for stimulus generation, one for response capture. Use Value: Internal loopback mode validates TX/RX path pre-test; false start bit rejection eliminates false triggers from relay switching noise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual UART applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SC16C752BIBS | HVQFN32 package (5 × 5 mm); lacks n.c. pins and RXRDYB/TXRDYB pins present in LQFP48 | Suitable for space-constrained PCBs but requires redesign for pin-compatible replacement | Select SC16C752BIBS only when board area is critical and modem signal count can be reduced. |
| TL16C752BPFB | Texas Instruments variant; identical register map and pinout but different thermal specs (−40 °C to +105 °C) | Preferred for extended-temperature automotive or aerospace deployments where NXP's +85 °C limit is insufficient | Choose TL16C752BPFB when operating above 85 °C ambient is required and TI qualification documentation is mandated. |
Compared with SC16C752BIB48,151, the SC16C752BIBS offers smaller footprint but fewer modem control pins, while TL16C752BPFB extends temperature range at the cost of vendor-specific qualification timelines and sourcing lead times.
Availability
SC16C752BIB48,151 is available at Aetrix Electronics and suitable for industrial PLC gateways, multi-port terminal servers, and medical diagnostic interfaces requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for SC16C752BIB48,151 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 company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT markets.
The SC16C752BIB48,151 belongs to NXP's legacy UART product line designed for robust, pin-compatible upgrades of SC16C2550-based systems while adding FIFO depth, enhanced flow control, and multi-voltage support.
FAQ
What voltage levels does the SC16C752BIB48,151 support for core operation?
The SC16C752BIB48,151 supports 5 V, 3.3 V, and 2.5 V supply voltages for core logic operation. Its D0–D7 data bus pins are 5 V tolerant regardless of VCC level, enabling direct interfacing with legacy 5 V microcontrollers even when the SC16C752BIB48,151 runs at 2.5 V. Maximum data rate varies with supply: 5 Mbit/s at 5 V, 3 Mbit/s at 2.5 V.
How does hardware flow control work on the SC16C752BIB48,151?
Hardware flow control on the SC16C752BIB48,151 uses auto-RTS and auto-CTS signals per channel. Auto-RTS asserts when the RX FIFO level drops below the halt threshold (programmed in TCR[3:0]); auto-CTS gates transmission - the SC16C752BIB48,151 stops sending after the current byte if CTSn deasserts before the middle of its last stop bit. Both features are enabled independently via EFR[7:6].
Can the SC16C752BIB48,151 operate with different FIFO trigger levels for transmit and receive?
Yes. The SC16C752BIB48,151 supports independent programmable trigger levels for TX and RX FIFOs via the Trigger Level Register (TLR). TLR[3:0] sets the RX FIFO interrupt/DMA trigger; TLR[7:4] sets the TX FIFO trigger. These are distinct from the TCR-based auto-RTS thresholds and allow fine-grained optimization of interrupt frequency versus latency in real-time systems.
What is the purpose of the TCR register in the SC16C752BIB48,151?
The Transmission Control Register (TCR) in the SC16C752BIB48,151 stores the halt and resume trigger levels used exclusively for auto-RTS flow control. TCR[3:0] defines the RX FIFO level at which RTSn deasserts; TCR[7:4] defines the level at which RTSn reasserts. This register enables adaptive hardware handshaking without CPU polling, critical for deterministic serial throughput in industrial networks.
Does the SC16C752BIB48,151 support internal loopback testing?
Yes. The SC16C752BIB48,151 includes an internal loopback mode that connects TX output directly to RX input inside the IC. This mode disables external RXA/RXB pins and validates UART functionality - including FIFO operation, interrupt generation, and register access - without external cabling or transceivers, accelerating board-level bring-up and field diagnostics.
SC16C752BIB48,151 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:
- 64 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:
- 48-LQFP (7x7)
SC16C752BIB48,151 FAQ
1.How can I place an order for SC16C752BIB48,151 through Aetrix?
Please submit a Request for Quotation (RFQ) for SC16C752BIB48,151 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 SC16C752BIB48,151 reliable?
The price and inventory of SC16C752BIB48,151 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC16C752BIB48,151 is usually 5 days.
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4.How is shipping managed for SC16C752BIB48,151?
SC16C752BIB48,151 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC16C752BIB48,151 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 SC16C752BIB48,151?
For technical support, including SC16C752BIB48,151 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC16C752BIB48,151 requirements.
6.How does Aetrix verify that SC16C752BIB48,151 is sourced from the original manufacturer or authorized distributors?
All SC16C752BIB48,151 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 SC16C752BIB48,151 meets industry standards.
7.What is the process for return or replacement of SC16C752BIB48,151?
All SC16C752BIB48,151 units undergo pre-shipment inspection (PSI). If there is an issue with SC16C752BIB48,151, 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 SC16C752BIB48,151 part is unused and in its original packaging.
Return procedure for SC16C752BIB48,151:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SC16C752BIB48,151 Tags
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