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NXP Semiconductors SC16C650BIBS,157
- Part No.:
- SC16C650BIBS,157
- Manufacturer:
- NXP Semiconductors
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
SC16C650BIBS,157.pdf
- Description:
- IC UART SINGLE W/FIFO 32-HVQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,547
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Product details
Overview
SC16C650BIBS,157 from NXP Semiconductors (formerly Philips) is a single-channel universal asynchronous receiver-transmitter (UART) IC for serial data communication in embedded industrial systems. It supports 5 V, 3.3 V, and 2.5 V operation, delivers up to 3 Mbit/s at 5 V, integrates 32-byte transmit and receive FIFOs, and includes IrDA 1.0 encoder/decoder for infrared interface in point-of-sale terminals and industrial HMIs.
For engineers reviewing the SC16C650BIBS,157 datasheet, SC16C650BIBS,157 pinout, SC16C650BIBS,157 application, or SC16C650BIBS,157 equivalent, key selection criteria include FIFO trigger level programmability, auto-RTS/CTS hardware flow control, IrDA 1.0 support up to 115.2 kbit/s, 32-terminal HVQFN32 package compatibility, and register-level software compatibility with legacy 16C450 drivers.
Technical Context
The SC16C650BIBS,157 implements a dual-FIFO architecture with independent 32-byte TX/RX buffers and four selectable interrupt trigger levels per FIFO, enabling high-throughput serial communication without CPU polling overhead. Its baud rate generator accepts up to 48 MHz input clock and supports programmable divisors (1–65535) to achieve precise rates from DC to 3 Mbit/s at 5 V, 2 Mbit/s at 3.3 V, and 1 Mbit/s at 2.5 V.
It features integrated IrDA 1.0 physical layer encoding/decoding, automatic hardware flow control via RTS/CTS with threshold-based assertion, and full modem control signaling (DTR, DSR, RI, DCD). Internal registers-including EFR, Xon/Xoff1–2, and FCR-enable runtime configuration of flow control mode, character format (5–8 bits, parity, stop bits), and sleep mode activation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.5 V, 3.3 V, or 5 V ±10% - enables direct integration into mixed-voltage industrial control boards without level-shifting. |
| Max Data Rate | 3 Mbit/s at 5 V - supports high-speed modem and networking interfaces requiring low-latency serial throughput. |
| FIFO Depth | 32-byte TX + 32-byte RX - reduces CPU interrupt frequency by >90% vs. 16C450, improving real-time system responsiveness. |
| IrDA Support | Version 1.0, up to 115.2 kbit/s - provides certified infrared physical layer for secure short-range wireless HMI and diagnostic links. |
| Operating Temp | −40 °C to +85 °C - qualified for deployment in uncontrolled industrial environments including factory automation and remote telemetry. |
| Interrupt Priority | Prioritized ISR with configurable enable per source - allows deterministic handling of RX timeout, TX ready, and modem status events in safety-critical firmware. |
| Crystal Input | XTAL1/XTAL2 pins support 1.8432 MHz to 48 MHz - accommodates standard UART crystals or high-frequency clocks for custom baud rates. |
Pinout & Package
SC16C650BIBS,157 is housed in a 5 × 5 × 0.85 mm HVQFN32 package with 32 exposed-pad terminals and no leads, optimized for thermal dissipation and PCB space efficiency in compact industrial modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A2 | Register Address Select | Enable access to 17 internal registers (THR, LCR, FCR, MSR, etc.) using standard 8-bit bus addressing. |
| BAUDOUT | Transmit Clock Output | Provides 16× baud rate clock signal; can drive external receiver or synchronize peripheral timing. |
| CS | Chip Select | Single active-low enable for UART register access - simplifies address decoding vs. multi-CS schemes. |
| D0–D7 | Data Bus I/O | Bi-directional 8-bit TTL-compatible interface with 3-state outputs for seamless connection to microcontroller data buses. |
| INT | Interrupt Request | Open-drain output asserting HIGH on RX FIFO trigger, TX empty, line error, or modem event - directly drives ARM/Cortex-M NVIC inputs. |
| RX / TX | Serial I/O | Asynchronous TTL-level UART channel supporting RS-232/RS-485 transceivers or direct IrDA PHY connection. |
| RTS / CTS | Hardware Flow Control | Auto-controlled RTS output and CTS input enable zero-software-overhead flow management in FIFO mode. |
| TXRDY / RXRDY | DMA Ready Signals | Active-low DMA handshake outputs supporting both single- and multi-transfer burst modes for efficient memory-mapped transfers. |
| VCC / GND | Power Supply | 2.5/3.3/5 V supply and ground pins placed for low-noise decoupling - requires local 100 nF ceramic capacitor per VCC pin. |
| XTAL1 / XTAL2 | Oscillator Interface | Supports parallel-resonant crystal (e.g., 1.8432 MHz) or external clock source - eliminates need for separate oscillator IC. |
Key Features
| Feature | Design Value |
|---|---|
| 32-byte TX/RX FIFOs | Reduces CPU interrupt load by buffering bursts of serial data - critical for deterministic response in RTOS-based industrial controllers. |
| Programmable Auto-RTS/CTS | Hardware-managed flow control eliminates software polling and prevents FIFO overflow during sustained high-rate transmission. |
| IrDA 1.0 Encoder/Decoder | On-die infrared physical layer compliant with IrDA specification - enables contactless firmware updates and diagnostics without external PHY IC. |
| Four FIFO Trigger Levels | Configurable RX/TX interrupt thresholds (8/16/24/28 bytes) allow tuning interrupt latency vs. CPU utilization trade-offs per application. |
| Sleep Mode | Reduces quiescent current below 10 µA while retaining register state - extends battery life in portable industrial test equipment. |
| 16C450 Software Compatibility | Power-on reset configures registers identically to 16C450 - enables drop-in replacement in legacy Linux/RTOS UART drivers without modification. |
Applications
| Industrial PLC Serial Gateway | Point-of-Sale Terminal |
|---|---|
Use Scenario: Connects legacy RS-232 field devices (sensors, actuators) to modern ARM-based PLC backplanes via isolated UART bridges. IC Role / Device Role / Timing Role: UART interface IC handling protocol translation, FIFO buffering, and hardware flow control between fieldbus and host processor. Use Value: 32-byte FIFOs absorb bursty Modbus ASCII/RTU traffic; auto-RTS/CTS prevents packet loss during network congestion; −40 °C to +85 °C rating ensures reliability in cabinet-mounted controllers. | Use Scenario: Enables infrared-based receipt printing and customer-facing display updates in retail kiosks with space-constrained PCB layouts. IC Role / Device Role / Timing Role: Integrated IrDA PHY and UART controller managing bidirectional IR link timing, encoding, and error-checked data framing. Use Value: On-chip IrDA 1.0 compliance eliminates discrete IR transceiver; HVQFN32 footprint saves >40% board area vs. PLCC44; 2.5 V operation matches low-power display subsystems. |
| Medical Diagnostic Handheld | Remote Telemetry Module |
Use Scenario: Provides isolated serial debug port and firmware update interface in battery-powered ultrasound probe accessories. IC Role / Device Role / Timing Role: Low-power UART with sleep mode and IrDA support acting as secure, contactless service interface. Use Value: Sleep mode draws <10 µA during idle periods; IrDA 115.2 kbit/s enables authenticated firmware patches; 32-byte RX FIFO handles large configuration downloads without host intervention. | Use Scenario: Interfaces GPS receivers and cellular modems to microcontrollers in solar-powered environmental monitoring nodes. IC Role / Device Role / Timing Role: Dual-role UART managing simultaneous NMEA 0183 GPS streaming and AT-command modem control over shared bus. Use Value: Independent TX/RX FIFO trigger levels prevent GPS data starvation during modem command sequences; 5 V tolerant inputs accept noisy field signals without external clamping. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar UART interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SC16C654BIBS,157 | Quad-channel version with identical per-channel specs, same HVQFN32 package, but shares clock and interrupt resources across channels. | Designed for multi-port serial concentrators (e.g., 4-port RS-232 hub), not single-channel point-to-point links. | Select only when consolidating ≥4 UARTs onto one IC to reduce BOM count and PCB area - not a functional substitute for single-channel use cases. |
| TL16C750IPM | TI part with 64-byte FIFOs, enhanced DMA engine, and wider voltage range (1.8–5.5 V), but lacks IrDA encoder/decoder and uses 48-pin TQFP. | Targets high-bandwidth embedded computing (e.g., x86 SBCs), where IrDA is unnecessary and larger package is acceptable. | Choose when maximum FIFO depth and 1.8 V compatibility are required, and infrared capability is omitted - requires PCB redesign due to different pinout and package. |
Compared with SC16C650BIBS,157, the SC16C654BIBS,157 offers channel density at the cost of per-channel independence, while the TL16C750IPM trades IrDA integration for deeper FIFOs and broader voltage support - neither is pin-compatible, and both require firmware and layout changes.
Availability
SC16C650BIBS,157 is available at Aetrix Electronics and suitable for industrial PLC gateways, point-of-sale terminals, medical handheld diagnostics, and remote telemetry modules requiring stable component supply across extended product lifecycles.
Supply support for SC16C650BIBS,157 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 roots in Philips' semiconductor division.
The SC16C650BIBS,157 belongs to NXP's legacy UART product line designed specifically for industrial serial communication infrastructure, emphasizing interoperability with 16C450 software, robustness in harsh environments, and integration of IrDA for maintenance-free field service.
FAQ
What voltage levels does the SC16C650BIBS,157 support, and how does that affect system design?
The SC16C650BIBS,157 operates at 2.5 V, 3.3 V, or 5 V ±10%, with 5 V-tolerant inputs. This allows direct interfacing with legacy 5 V logic, modern low-voltage microcontrollers, and mixed-voltage PCBs without level shifters. Designers must select one supply voltage and configure the device accordingly - it does not auto-detect or dynamically switch between voltages. The chosen VCC determines maximum data rate: 3 Mbit/s at 5 V, 2 Mbit/s at 3.3 V, and 1 Mbit/s at 2.5 V.
Does the SC16C650BIBS,157 support true IrDA physical layer compliance, and what is its maximum data rate?
Yes, the SC16C650BIBS,157 includes a fully integrated IrDA 1.0-compliant encoder/decoder supporting data rates up to 115.2 kbit/s. It handles pulse shaping, RZI modulation, and frame formatting per the IrDA specification, eliminating the need for external IrDA PHY ICs. The SC16C650BIBS,157 achieves this using dedicated on-die circuitry synchronized to the BAUDOUT clock, and requires only an external IR LED and photodiode with appropriate current-limiting resistors.
How does the auto-RTS feature work in the SC16C650BIBS,157, and what configuration is required?
The SC16C650BIBS,157 auto-RTS function asserts RTS based on receive FIFO fill level relative to a programmable trigger threshold (8/16/24/28 bytes). It activates only when Enhanced Feature Register bit EFR[6] = 1 and FIFO Control Register bit FCR[0] = 1. Once enabled, RTS goes LOW when the FIFO reaches the trigger level and returns HIGH only after the FIFO drops below the next lower threshold - preventing premature re-enablement. This hardware flow control operates independently of CPU intervention.
Can the SC16C650BIBS,157 be used as a direct replacement for older 16C450-based designs?
Yes, the SC16C650BIBS,157 powers up in 16C450-compatible mode: all registers match the 16C450 map, and it responds identically to standard UART driver software. No firmware changes are needed for basic operation. To access advanced features (32-byte FIFOs, auto-flow control, IrDA), software must write to the Enhanced Feature Register (EFR) and configure FCR - but legacy code continues to run unchanged, making SC16C650BIBS,157 a seamless upgrade path.
What are the thermal and packaging advantages of the HVQFN32 package used in the SC16C650BIBS,157?
The SC16C650BIBS,157 uses a 5 × 5 × 0.85 mm HVQFN32 package with an exposed thermal pad, offering superior thermal resistance (<45 °C/W junction-to-board) compared to PLCC44 or DIP40 alternatives. Its leadless construction reduces parasitic inductance for cleaner signal integrity, and the small footprint saves >50% PCB area. The package is RoHS-compliant and qualified for reflow soldering per JEDEC J-STD-020, supporting high-density industrial module assembly.
SC16C650BIBS,157 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 32-VFQFN Exposed Pad
- Series:
- -
- Packaging:
- Tray
- Product Status:
- Obsolete
- Features:
- -
- Number of Channels:
- 1, UART
- FIFO's:
- 32 Byte
- Protocol:
- -
- Data Rate (Max):
- 3Mbps
- 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:
- 32-HVQFN (5x5)
SC16C650BIBS,157 FAQ
1.How can I place an order for SC16C650BIBS,157 through Aetrix?
Please submit a Request for Quotation (RFQ) for SC16C650BIBS,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 SC16C650BIBS,157 reliable?
The price and inventory of SC16C650BIBS,157 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC16C650BIBS,157 is usually 5 days.
3.What payment methods are accepted for SC16C650BIBS,157?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC16C650BIBS,157 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC16C650BIBS,157?
SC16C650BIBS,157 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC16C650BIBS,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 SC16C650BIBS,157?
For technical support, including SC16C650BIBS,157 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC16C650BIBS,157 requirements.
6.How does Aetrix verify that SC16C650BIBS,157 is sourced from the original manufacturer or authorized distributors?
All SC16C650BIBS,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 SC16C650BIBS,157 meets industry standards.
7.What is the process for return or replacement of SC16C650BIBS,157?
All SC16C650BIBS,157 units undergo pre-shipment inspection (PSI). If there is an issue with SC16C650BIBS,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 SC16C650BIBS,157 part is unused and in its original packaging.
Return procedure for SC16C650BIBS,157:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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