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NXP Semiconductors SC16C652BIB48,157
- Part No.:
- SC16C652BIB48,157
- Manufacturer:
- NXP Semiconductors
- Package:
- 48-LQFP
- Datasheet:
-
SC16C652BIB48,157.pdf
- Description:
- UART IC 2, DUART CHANNEL 32 BYTE
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
SC16C652BIB48 from NXP Semiconductors (formerly Philips) is a dual-channel 5 V/3.3 V/2.5 V UART IC for high-speed serial communication, supporting up to 5 Mbit/s data rate, 32-byte TX/RX FIFOs per channel, and integrated IrDA 1.0 encoder/decoder. It serves as a drop-in upgrade to legacy 16C2450/16C2550 UARTs in industrial control, modem interfaces, and embedded communications systems.
For engineers reviewing the SC16C652BIB48 datasheet, SC16C652BIB48 pinout, SC16C652BIB48 application, or SC16C652BIB48 equivalent, key selection considerations include dual-channel asynchronous framing with independent baud rate generation, hardware/software flow control (RTS/CTS, Xon/Xoff), FIFO trigger-level programmability, and LQFP48 package compatibility with legacy 16C2450 designs.
Technical Context
The SC16C652BIB48 implements two independent UART channels (A and B), each with fully programmable character formatting (5–8 bit, 1/1.5/2 stop bits, even/odd/no parity), false start-bit detection, and line break generation/detection. Its internal architecture includes separate 32-byte transmit and receive FIFOs, a shared 16× clock divider-based baud rate generator configurable via DLL/DLM registers, and prioritized interrupt logic supporting TXRDY/RXRDY status signaling.
It supports three operational modes: standard asynchronous mode with modem control (CTS/RTS/DSR/DTR/RI/CD), IrDA 1.0 infrared mode (up to 115.2 kbit/s), and internal loop-back diagnostics. Power management includes sleep mode, and voltage tolerance extends to 5 V inputs on 3.3 V/2.5 V supply operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | Up to 5 Mbit/s at 5 V/3.3 V; 3 Mbit/s at 2.5 V - enables high-speed modem and network interface integration without external clock multiplication. |
| FIFO Depth | 32-byte TX + 32-byte RX per channel - reduces CPU interrupt load by >50% vs. 16-byte FIFO predecessors, improving real-time throughput in multi-channel systems. |
| Supply Voltage | 2.5 V / 3.3 V / 5 V operation with 5 V-tolerant inputs - allows direct interfacing with legacy 5 V logic while supporting modern low-voltage microcontrollers. |
| IrDA Support | IrDA 1.0 encoder/decoder (≤115.2 kbit/s) - eliminates need for external IrDA PHY in portable and industrial IR communication links. |
| Interrupt Control | Independent TXRDY/RXRDY outputs + prioritized INTA/INTB - enables precise DMA coordination and avoids interrupt masking of critical receive timeout events. |
| Temperature Range | −40 °C to +85 °C - certified for continuous operation in industrial automation, transportation, and outdoor embedded equipment. |
| Baud Rate Generation | Programmable divisor (1–65535) from 16× input clock - supports custom rates (e.g., 460.8 kbit/s for ISDN modems) using standard 1.8432 MHz or 7.3728 MHz crystals. |
Pinout & Package
LQFP48 package (7 × 7 × 1.4 mm, SOT313-2), lead-free, RoHS-compliant, with 48-pin quad flat configuration optimized for industrial PCB layout and thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D0–D7 | Bi-directional data bus | 8-bit parallel interface to host CPU; 3-state TTL drive enables shared bus operation without external buffers. |
| A0–A2 | Register address select | Selects among 8 internal register sets (THR/RHR, IER/ISR, FCR, LCR, MCR/MSR, LSR, SPR, DLL/DLM) per UART channel. |
| CSA / CSB | Channel-select chip enable | Active-low enables independent access to UART A or B registers; supports simultaneous dual-channel configuration. |
| TXA / TXB | Transmit serial output | Asynchronous NRZ output with programmable framing; disabled during reset or loop-back mode. |
| RXA / RXB | Receive serial input | CMOS-compatible input with false start-bit rejection; internally looped to TX during diagnostic mode. |
| INTA / INTB | Channel-specific interrupt output | Active-low open-drain signal indicating pending RX/TX/line/modem events; priority-encoded per channel. |
| TXRDYA / TXRDYB | Transmit FIFO ready flag | Active-low indicates ≥1 empty location in TX FIFO/THR - used for DMA handshaking or polling efficiency. |
| RXRDYA / RXRDYB | Receive FIFO ready flag | Active-low indicates ≥1 valid byte in RX FIFO/RHR or timeout condition - enables zero-wait-state data capture. |
| RTSA / RTSB | Request-to-send output | Active-low flow control signal asserting local buffer readiness; auto-controlled in hardware flow mode. |
| CTSA / CTSB | Clear-to-send input | Active-low remote flow control input; halts transmission when deasserted - prevents RX FIFO overflow in connected devices. |
| XTAL1 / XTAL2 | Crystal oscillator interface | Supports 1–80 MHz clock input; internal oscillator formed with external crystal + 1 MΩ resistor; XTAL2 buffered output usable as system clock source. |
| RESET | Active-high synchronous reset | Initializes all registers to 16C2450-compatible state; disables TX/RX outputs and clears FIFOs. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent UART channels | Enables concurrent RS-232/RS-485 and IrDA links on single IC - reduces board space and BOM count vs. discrete UART solutions. |
| Four selectable FIFO trigger levels (8/16/24/28 bytes) | Allows fine-grained trade-off between interrupt latency and CPU bandwidth usage - critical for deterministic real-time response in industrial PLCs. |
| Automatic hardware/software flow control | Eliminates data loss in bursty traffic by synchronizing TX/RX buffer states across UART A/B without firmware intervention. |
| Internal loop-back diagnostics | Validates UART functionality end-to-end without external cabling - accelerates factory test and field failure root-cause analysis. |
| Sleep mode with wake-on-RX | Reduces active current to <100 µA while retaining ability to resume on incoming serial activity - extends battery life in portable telemetry devices. |
Applications
| Industrial Serial Gateway | Legacy Modem Interface |
|---|---|
Use Scenario: Connecting PLCs, HMIs, and sensors via RS-232/485 to Ethernet or CAN backbone. IC Role / Device Role / Timing Role: Dual UART bridges parallel CPU bus to two independent serial physical layers with independent baud rates and framing. Use Value: 32-byte FIFOs prevent data loss during CPU context switches; hardware flow control ensures reliable packet delivery in noisy factory environments. | Use Scenario: Integrating V.34/V.90 analog modems into embedded routers or fax servers. IC Role / Device Role / Timing Role: UART A handles AT command channel; UART B manages data stream with IrDA fallback for wireless setup. Use Value: 5 Mbit/s capability supports high-speed modem handshaking; IrDA 1.0 enables cable-free configuration without adding RF complexity. |
| Medical Device Data Logger | Point-of-Sale Terminal |
Use Scenario: Aggregating ECG, SpO₂, and temperature sensor streams into encrypted SD card storage. IC Role / Device Role / Timing Role: UART B receives time-stamped sensor data; UART A transmits logs via RS-232 to PC or printer. Use Value: Independent TX/RX FIFO trigger levels optimize interrupt frequency per channel; sleep mode cuts standby power by 90% between acquisitions. | Use Scenario: Interfacing barcode scanners, receipt printers, and PIN pads in retail terminals. IC Role / Device Role / Timing Role: UART A drives 9600 bps thermal printer; UART B handles 115.2 kbps scanner data with Xon/Xoff flow control. Use Value: Programmable Xon/Xoff characters prevent buffer overruns from fast-scanning bursts; 2.5 V operation matches low-power MCU supply rails. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual UART applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SC16C654BIB48 | 4-channel UART with identical 32-byte FIFOs, IrDA, and pinout - adds two extra UARTs in same LQFP48 footprint. | Required when expanding from 2 to 4 serial ports without redesigning PCB layout or firmware driver layer. | Select SC16C654BIB48 only if future port scalability is mandated; otherwise SC16C652BIB48 minimizes cost and power. |
| TL16C752BPFG | TI dual UART with 64-byte FIFOs, 16-MHz max clock, and enhanced error reporting - not pin-compatible; requires PCB redesign. | Preferred where higher FIFO depth is needed for >100 kbit/s sustained throughput under heavy CPU load. | Choose TL16C752BPFG only after verifying layout change feasibility; SC16C652BIB48 maintains full software compatibility with 16C2450 drivers. |
Compared with SC16C654BIB48, the SC16C652BIB48 delivers optimal cost/performance for fixed 2-port systems; versus TL16C752BPFG, it offers proven drop-in replacement for legacy 16C2450 designs without firmware or layout changes.
Availability
SC16C652BIB48 is available at Aetrix Electronics and suitable for industrial serial gateways, legacy modem interfaces, medical data loggers, point-of-sale terminals, and embedded communication modules requiring stable component supply across extended product lifecycles.
Supply support for SC16C652BIB48 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 heritage in Philips semiconductor technology.
The SC16C652BIB48 belongs to NXP's legacy UART product line, designed specifically for robust, low-power, multi-protocol serial bridging in industrial and telecom infrastructure where long-term supply stability and backward compatibility are critical.
FAQ
What voltage levels does the SC16C652BIB48 support, and are its inputs 5 V tolerant?
The SC16C652BIB48 operates at 2.5 V, 3.3 V, or 5 V supply voltages and features 5 V-tolerant inputs - meaning it accepts 5 V logic signals even when powered at 2.5 V or 3.3 V. This allows seamless interfacing with mixed-voltage systems without level shifters. All digital I/O pins (D0–D7, CSA, CSB, RTS, CTS, etc.) maintain this tolerance, simplifying design integration in legacy and modern platforms alike. The SC16C652BIB48 datasheet confirms this behavior across the full industrial temperature range.
How does the SC16C652BIB48 handle flow control, and can both hardware and software methods be used simultaneously?
The SC16C652BIB48 supports independent hardware (RTS/CTS) and software (Xon/Xoff) flow control per channel, but they cannot operate simultaneously on the same UART channel. Hardware flow control is enabled via EFR[7:6]; software flow control requires EFR[5:4] and programmed Xon/Xoff registers. Using both concurrently causes undefined behavior. The SC16C652BIB48 allows channel A to use RTS/CTS while channel B uses Xon/Xoff - a common configuration in multi-peripheral systems. Configuration is done through the Enhanced Feature Register and Modem Control Register.
What is the maximum data rate achievable with the SC16C652BIB48, and what clock frequency is required?
The SC16C652BIB48 achieves a maximum data rate of 5 Mbit/s at 5 V or 3.3 V supply, and 3 Mbit/s at 2.5 V. This requires an 80 MHz input clock to the baud rate generator (16× oversampling). With a standard 7.3728 MHz crystal, the SC16C652BIB48 supports up to 460.8 kbit/s - sufficient for V.34 modems and industrial protocols. The DLL/DLM registers allow precise divisor programming; for example, a 1.8432 MHz clock yields 115.2 kbit/s with divisor = 1. All rates are verified in the SC16C652BIB48 datasheet timing tables.
Is the SC16C652BIB48 pin-compatible with the 16C2450, and what software compatibility exists?
Yes, the SC16C652BIB48 is pin-compatible with the 16C2450 in the LQFP48 package (SOT313-2) and powers up in 16C2450 functional mode - ensuring immediate drop-in replacement without PCB changes. Its register map is software-compatible with industry-standard 16C450, 16C550, and SC16C650 UARTs. Firmware written for those parts runs unchanged on the SC16C652BIB48, though enhanced features (FIFO control, EFR, IrDA) require updated initialization sequences. This backward compatibility is explicitly guaranteed in the SC16C652BIB48 datasheet.
Does the SC16C652BIB48 support IrDA communication, and what version and data rate does it implement?
Yes, the SC16C652BIB48 integrates a full IrDA 1.0 encoder/decoder supporting data rates up to 115.2 kbit/s - compliant with the IrDA Physical Layer Specification 1.0. It handles pulse shaping, encoding (RZI), and decoding internally, eliminating external IrDA PHY components. The IrDA function shares UART B's TX/RX pins and is selected via the Line Control Register (LCR[6]). No additional clock sources or external circuitry are needed. This capability is confirmed in the SC16C652BIB48 functional description and block diagram.
SC16C652BIB48,157 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 48-LQFP
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Features:
- -
- Number of Channels:
- 2, DUART
- FIFO's:
- 32 Byte
- Protocol:
- -
- Data Rate (Max):
- 5Mbps
- Voltage - Supply:
- 2.5V, 3.3V, 5V
- With Auto Flow Control:
- Yes
- With IrDA Encoder/Decoder:
- Yes
- With False Start Bit Detection:
- Yes
- With Modem Control:
- Yes
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-LQFP (7x7)
SC16C652BIB48,157 FAQ
1.How can I place an order for SC16C652BIB48,157 through Aetrix?
Please submit a Request for Quotation (RFQ) for SC16C652BIB48,157 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 SC16C652BIB48,157 reliable?
The price and inventory of SC16C652BIB48,157 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC16C652BIB48,157 is usually 5 days.
3.What payment methods are accepted for SC16C652BIB48,157?
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4.How is shipping managed for SC16C652BIB48,157?
SC16C652BIB48,157 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC16C652BIB48,157 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 SC16C652BIB48,157?
For technical support, including SC16C652BIB48,157 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC16C652BIB48,157 requirements.
6.How does Aetrix verify that SC16C652BIB48,157 is sourced from the original manufacturer or authorized distributors?
All SC16C652BIB48,157 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 SC16C652BIB48,157 meets industry standards.
7.What is the process for return or replacement of SC16C652BIB48,157?
All SC16C652BIB48,157 units undergo pre-shipment inspection (PSI). If there is an issue with SC16C652BIB48,157, 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 SC16C652BIB48,157 part is unused and in its original packaging.
Return procedure for SC16C652BIB48,157:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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