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NXP Semiconductors SC16C752IB48,128
- Part No.:
- SC16C752IB48,128
- Manufacturer:
- NXP Semiconductors
- Package:
- 48-LQFP
- Datasheet:
-
SC16C752IB48,128.pdf
- Description:
- IC DUAL UART 64BYTE 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,681
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Product details
Overview
SC16C752IB48,128 from NXP Semiconductors (formerly Philips) is a dual-channel UART IC with independent 64-byte transmit and receive FIFOs, hardware/software flow control, and support for data rates up to 5 Mbit/s at 3.3 V or 5 V. It integrates full modem control (RTS/CTS/DSR/DTR/RI/CD), programmable baud rate generation with prescaler, and dual interrupt outputs (INTA/INTB) for embedded serial communication in industrial controllers and telecom interface cards.
For engineers reviewing the SC16C752IB48,128 datasheet, SC16C752IB48,128 pinout, SC16C752IB48,128 application, or SC16C752IB48,128 equivalent, key selection criteria include FIFO trigger level programmability, Auto-RTS/Auto-CTS timing behavior, dual-channel interrupt prioritization, sleep mode entry conditions, and LQFP48 package compatibility with legacy SC16C2550-based PCB layouts.
Technical Context
The SC16C752IB48,128 implements two independent UART channels (A and B), each with dedicated 64-byte FIFOs, separate address decoding (A0–A2), chip select lines (CSA/CSB), and interrupt outputs (INTA/INTB). Its enhanced feature register (EFR) enables Auto-RTS and Auto-CTS via TCR-defined halt/resume thresholds, while the transmission control register (TCR) stores receiver FIFO levels that directly gate transmitter output during hardware flow control.
It supports three voltage domains (2.5 V, 3.3 V, 5 V), with maximum baud rate scaling from 3 Mbit/s (2.5 V) to 5 Mbit/s (3.3 V/5 V); the baud rate generator uses a 16× oversampling clock derived from XTAL1/XTAL2 input, with optional divide-by-4 prescaling enabled by MCR[7]. DMA signaling (TXRDY/RXRDY) operates in both single-character (DMA mode 0) and block-transfer (DMA mode 1) configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | Dual independent UARTs (A and B) with separate I/O, control, and interrupt logic. |
| FIFO depth | 64-byte TX and RX FIFO per channel; includes error status bits for RX bytes. |
| Max baud rate | 5 Mbit/s at 3.3 V or 5 V; reduced to 3 Mbit/s at 2.5 V due to timing margin constraints. |
| Flow control | Hardware (Auto-RTS/Auto-CTS via EFR[7:6]) and software (Xon/Xoff via EFR[3:0]) - mutually exclusive modes. |
| Interrupt system | Six prioritized interrupt sources per channel, including line status, RX timeout, THR empty, modem status, Xoff detection, and CTS/RTS change. |
| Power supply | Supports 2.5 V, 3.3 V, and 5 V operation; internal regulators not used - direct VCC connection required. |
| Crystal interface | XTAL1/XTAL2 pins support external crystal (1–25 MHz) or buffered clock input; no internal oscillator capacitor required. |
Pinout & Package
SC16C752IB48,128 is housed in a plastic LQFP48 package (7 × 7 × 1.4 mm, SOT313-2) with 48 leads and exposed pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D0–D7 | 8-bit bidirectional data bus | Transfers register contents between CPU and UART; D0 = LSB; tri-state when IOR/IOW inactive. |
| A0–A2 | Address select inputs | Select internal register address (0–7) for read/write access within each channel's register map. |
| CSA / CSB | Channel-select chip enables | Active-low enables data transfer to UART A or B independently; allows shared bus with other peripherals. |
| IOR / IOW | Read/write strobes | Active-low controls direction and timing of data transfer; synchronous with address and chip select. |
| TXA / TXB | Serial transmit outputs | CMOS-level asynchronous serial output per channel; disabled during local loopback mode. |
| RXA / RXB | Serial receive inputs | CMOS-level asynchronous serial input per channel; internally disconnected during loopback. |
| RTSA / RTSB | Request-to-send outputs | Active-low handshake signals controlled by Auto-RTS logic or MCR[1]; indicate readiness to receive. |
| CTSA / CTSB | Clear-to-send inputs | Active-low handshake inputs enabling Auto-CTS; must be asserted before TX begins next byte. |
| INTA / INTB | Channel interrupt outputs | Active-high open-drain capable; individually maskable via IER; reflect highest-priority pending interrupt. |
| RXRDYA / RXRDYB | FIFO ready indicators | Active-low signals indicating RX FIFO ≥ trigger level (or non-empty in FIFO disable mode). |
| TXRDYA / TXRDYB | FIFO ready indicators | Active-low signals indicating TX FIFO ≤ trigger level (or empty in FIFO disable mode). |
| RESET | Asynchronous reset input | Active-high clears most registers and disables TX/RX; does not reset DLL/DLH/Xon/Xoff registers. |
| XTAL1 / XTAL2 | Clock interface | XTAL1 accepts crystal or external clock; XTAL2 outputs buffered clock; forms 16× baud base clock. |
Key Features
| Feature | Design Value |
|---|---|
| 64-byte dual FIFO architecture | Reduces CPU interrupt load by >90% vs. 16-byte FIFO UARTs; supports DMA block transfers without overrun. |
| Programmable Auto-RTS/Auto-CTS | Halt/resume thresholds stored in TCR allow precise RX FIFO watermarking to prevent buffer overflow during high-speed streaming. |
| Enhanced interrupt prioritization | Six-level priority scheme ensures critical errors (framing, break, overrun) preempt lower-priority events like THR empty or modem status. |
| Software flow control with Xon/Xoff variants | Configurable via EFR[3:0] to support single/dual Xon/Xoff tokens; Xon Any mode (MCR[5]) resumes after any character post-Xoff. |
| Low-power sleep mode | Entered only when RX idle, TX empty, and no pending interrupts except THR/time-out; stops baud clock to cut dynamic power >80%. |
Applications
| Industrial PLC Serial Gateway | Telecom Line Card Interface |
|---|---|
Use Scenario: Connecting legacy RS-232/RS-485 field devices to a central controller via isolated serial backplane. IC Role / Device Role / Timing Role: Dual UART bridges parallel CPU bus to two independent serial links; handles protocol framing, parity, and stop-bit generation per channel. Use Value: 64-byte FIFOs absorb bursty sensor data without CPU polling; Auto-RTS prevents overrun when PLC scan cycle delays RX servicing. | Use Scenario: Adding two asynchronous modem/data-fax ports to a carrier-grade line card supporting V.34/V.90 standards. IC Role / Device Role / Timing Role: Provides full modem handshaking (CTS/RTS/DSR/DTR/RI/CD) and software flow control for legacy PSTN connectivity. Use Value: Independent INTA/INTB enable per-port interrupt handling; Xon/Xoff token programmability supports diverse modem command sets. |
| Medical Diagnostic Equipment | Point-of-Sale Terminal Backend |
Use Scenario: Interfacing ECG/ultrasound modules with host processor over isolated UART links under strict EMC requirements. IC Role / Device Role / Timing Role: Receives time-critical waveform data streams; generates precise baud clocks from stable crystal reference. Use Value: 5 Mbit/s capability supports high-resolution data logging; false start-bit detection rejects noise-induced framing errors. | Use Scenario: Managing simultaneous serial connections to receipt printer, magnetic stripe reader, and PIN pad in retail terminals. IC Role / Device Role / Timing Role: Acts as serial multiplexer with independent FIFO buffering per peripheral; handles variable latency of peripheral responses. Use Value: Sleep mode reduces standby power during idle periods; programmable trigger levels optimize interrupt frequency per peripheral speed profile. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual UART applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SC16C752BIB48,128 | Same die, revised mask set (Rev. 05+); identical electrical specs and pinout; minor ESD robustness improvement. | No functional or layout impact; drop-in replacement for new designs requiring latest wafer revision. | Select SC16C752BIB48,128 for new production if long-term availability of Rev. 04 mask is uncertain. |
| TL16C752BIPF | Texas Instruments variant; pin-compatible but requires different initialization sequence for EFR; supports same 64-byte FIFO and Auto-RTS. | Requires firmware adaptation for enhanced register access; no change to PCB or signal routing. | Choose TL16C752BIPF only when TI supply chain advantages outweigh firmware revalidation effort. |
Compared with SC16C752IB48,128, the SC16C752BIB48,128 offers identical functionality with improved manufacturing consistency, while the TL16C752BIPF demands register-level firmware changes despite matching pinout and core features - making the former a seamless upgrade and the latter a conditional alternative requiring validation.
Availability
SC16C752IB48,128 is available at Aetrix Electronics and suitable for industrial automation gateways, telecom line cards, medical diagnostic interfaces, and point-of-sale terminal backends requiring stable component supply across extended product lifecycles.
Supply support for SC16C752IB48,128 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, headquartered in Eindhoven, Netherlands, develops high-reliability interface, power management, and secure MCU solutions for industrial, automotive, and IoT markets.
The SC16C752IB48,128 belongs to NXP's legacy UART product line designed specifically for robust, low-latency serial bridging in resource-constrained embedded systems where deterministic interrupt response and FIFO-driven throughput are critical.
FAQ
What is the maximum supported baud rate for SC16C752IB48,128 and under what conditions?
The SC16C752IB48,128 supports up to 5 Mbit/s when operated at 3.3 V or 5 V supply voltage. At 2.5 V, the maximum reliable baud rate is limited to 3 Mbit/s due to reduced timing margins. This specification assumes use of the internal baud rate generator with XTAL1/XTAL2 clock input and proper PCB layout for signal integrity. The SC16C752IB48,128 achieves this using a 16× oversampled clock derived from the crystal or external clock source.
Does SC16C752IB48,128 support hardware flow control, and how is it implemented?
Yes, SC16C752IB48,128 supports hardware flow control via Auto-RTS and Auto-CTS functions, enabled independently through bits EFR[6] and EFR[7]. Auto-RTS asserts RTS when RX FIFO level falls below the halt threshold (TCR[3:0]) and deasserts it upon reaching that level; Auto-CTS gates TX transmission based on CTS input state. These features eliminate overrun errors without CPU intervention. The SC16C752IB48,128 requires explicit configuration of the enhanced feature register to activate either function.
How does the sleep mode operate in SC16C752IB48,128, and what triggers wake-up?
SC16C752IB48,128 enters sleep mode only when EFR[4] and IER[4] are both set, RX line is idle (HIGH for 4 character times), TX FIFO and shift register are empty, and no pending interrupts exist except THR empty or RX timeout. Wake-up occurs on any RX edge, modem input pin transition (CTS/DSR/RI/CD), or write to TX FIFO. Notably, sleep mode stops the baud rate clock - so DLL/DLH writes must disable sleep first. The SC16C752IB48,128 exits sleep synchronously with the next active clock edge.
Can SC16C752IB48,128 be used as a pin-for-pin replacement for SC16C2550?
Yes, SC16C752IB48,128 is explicitly pin-compatible with SC16C2550 and provides backward register compatibility for basic UART functions. However, enhanced features (Auto-RTS/Auto-CTS, TCR, EFR, sleep mode) require updated firmware initialization. The SC16C752IB48,128 retains identical LQFP48 footprint, power pinout, and control signal mapping - allowing direct PCB substitution where enhanced functionality is not immediately needed.
What are the key differences between SC16C752IB48,128 and TL16C752BIPF?
The SC16C752IB48,128 and TL16C752BIPF share pinout, 64-byte FIFO depth, Auto-RTS/Auto-CTS capability, and dual-interrupt architecture. Key differences include initialization sequence for the enhanced feature register (EFR), minor timing parameter variations, and vendor-specific ESD performance. Firmware written for SC16C752IB48,128 will not run unmodified on TL16C752BIPF without EFR access adjustments. The SC16C752IB48,128 remains the preferred choice for Philips/NXP-designated platforms.
SC16C752IB48,128 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 48-LQFP
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- 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)
SC16C752IB48,128 FAQ
1.How can I place an order for SC16C752IB48,128 through Aetrix?
Please submit a Request for Quotation (RFQ) for SC16C752IB48,128 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 SC16C752IB48,128 reliable?
The price and inventory of SC16C752IB48,128 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC16C752IB48,128 is usually 5 days.
3.What payment methods are accepted for SC16C752IB48,128?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC16C752IB48,128 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC16C752IB48,128?
SC16C752IB48,128 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC16C752IB48,128 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 SC16C752IB48,128?
For technical support, including SC16C752IB48,128 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC16C752IB48,128 requirements.
6.How does Aetrix verify that SC16C752IB48,128 is sourced from the original manufacturer or authorized distributors?
All SC16C752IB48,128 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 SC16C752IB48,128 meets industry standards.
7.What is the process for return or replacement of SC16C752IB48,128?
All SC16C752IB48,128 units undergo pre-shipment inspection (PSI). If there is an issue with SC16C752IB48,128, 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 SC16C752IB48,128 part is unused and in its original packaging.
Return procedure for SC16C752IB48,128:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SC16C752IB48,128 Tags
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SC16IS741AIPWJ
NXP Semiconductors
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TL16C550CIPTR
Texas Instruments
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SC16C752BIB48,128
NXP Semiconductors
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