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NXP Semiconductors SC16C650BIA44,512
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- Part No.:
- SC16C650BIA44,512
- Manufacturer:
- NXP Semiconductors
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
SC16C650BIA44,512.pdf
- Description:
- IC UART 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,225
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Product details
Overview
SC16C650BIA44,512 from NXP Semiconductors (formerly Philips) is a single-channel UART IC for asynchronous serial communication with 32-byte transmit and receive FIFOs, IrDA 1.0 encoder/decoder, and programmable auto-RTS/CTS flow control. It operates at 5 V, 3.3 V, or 2.5 V across −40 °C to +85 °C and supports up to 3 Mbit/s data rates at 5 V in industrial embedded systems requiring reliable legacy serial interface expansion.
For engineers reviewing the SC16C650BIA44,512 datasheet, SC16C650BIA44,512 pinout, SC16C650BIA44,512 application, or SC16C650BIA44,512 equivalent, key selection criteria include FIFO trigger level configurability, IrDA 1.0 support at 115.2 kbit/s, 5 V-tolerant inputs, sleep mode operation, and compatibility with existing 16C450 software stacks in resource-constrained industrial controllers.
Technical Context
The SC16C650BIA44,512 implements a fully programmable asynchronous serial interface with independent TX/RX baud rate generation via a 16× clock divider, supporting divisor values from 1 to 65535. Its internal register set includes enhanced feature registers (EFR), Xon/Xoff character registers, and FIFO control logic enabling hardware/software flow control and four selectable interrupt trigger levels per FIFO.
It integrates dedicated IrDA 1.0 encoder/decoder circuitry compliant with SIR physical layer timing, alongside full modem control signaling (RTS/CTS/DTR/DSR/RI/DCD) and DMA-ready status signals (TXRDY/RXRDY) with dual-mode (single/multi-transfer) support. The device powers up in 16C450-compatible mode and transitions to enhanced functionality only upon explicit EFR configuration.
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 backplanes without level-shifting. |
| Max Data Rate | 3 Mbit/s at 5 V (48 MHz input clock) - supports high-speed modem and shared-network applications requiring low-latency serial throughput. |
| FIFO Depth | 32-byte TX and RX FIFOs - reduces CPU interrupt load by >75% vs. 16C450 (0-byte) and 16C550 (16-byte) in burst-data scenarios. |
| IrDA Support | IrDA 1.0 physical layer (SIR) up to 115.2 kbit/s - enables infrared wireless connectivity without external transceiver ICs. |
| Interrupt Priority | Prioritized interrupt system with configurable enable/disable per source (RX/TX/LSR/MSR) - allows deterministic real-time response in safety-critical firmware. |
| Temperature Range | −40 °C to +85 °C - certified for deployment in uncontrolled industrial environments including factory automation and remote telemetry. |
| Input Tolerance | 5 V tolerant inputs on all control/data pins - permits direct interfacing with legacy 5 V microcontrollers while operating at 3.3 V or 2.5 V core supply. |
Pinout & Package
SC16C650BIA44,512 is housed in a plastic leaded chip carrier (PLCC44) package with 44 leads, 1.27 mm pitch, and JEDEC MO-047A outline. The package supports through-hole mounting and provides thermal performance suitable for continuous 3 Mbit/s operation at full industrial temperature range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D0–D7 | Bi-directional data bus | 8-bit parallel interface to CPU or microcontroller; 3-state TTL outputs allow direct connection to shared data buses. |
| A0–A2 | Register address select | Selects among 8 internal register groups (THR/RHR, IER/ISR, FCR, LCR, MCR/MSR, LSR, SPR, DLL/DLM/EFR) during read/write cycles. |
| IOR / IOW | Read/write strobes | Active-HIGH or active-LOW variants support both Intel- and Motorola-style bus timing; only one required per cycle. |
| CS0–CS2 | Chip select logic | 3-input decode enables selective activation in multi-peripheral systems; CS0=HIGH, CS1=HIGH, CS2=LOW selects device. |
| TX / RX | Serial data I/O | Asynchronous TTL-level transmit output and receive input; compatible with RS-232 line drivers or direct IrDA PHY connection. |
| RTS / CTS | Hardware flow control | Programmable auto-RTS asserts RTS when RX FIFO exceeds threshold; auto-CTS halts TX when CTS deasserts - eliminates software polling. |
| RCLK / XTAL1/2 | Receiver clock source | RCLK accepts external 16× baud clock; XTAL1/XTAL2 support crystal oscillator (1–48 MHz) or external clock input for precise baud rate generation. |
| TXRDY / RXRDY | DMA handshake signals | Active-low ready flags support single- or multi-transfer DMA modes; enable zero-wait-state data movement between UART and memory. |
| INT | Interrupt request output | Open-drain or push-pull (configurable) interrupt signal with prioritized vectoring - reduces ISR latency in real-time OS contexts. |
| DDIS | Transceiver driver disable | Controls external RS-232/RS-485 transceivers; asserts LOW during CPU read cycles to prevent bus contention. |
Key Features
| Feature | Design Value |
|---|---|
| 32-byte TX/RX FIFOs | Reduces CPU interrupt frequency by factor of 32 vs. 16C450, enabling higher throughput in multi-tasking embedded systems. |
| Programmable FIFO trigger levels | Four selectable thresholds (8/16/24/28 bytes) per FIFO allow fine-grained trade-off between latency and interrupt overhead. |
| Auto-RTS/CTS hardware flow control | Eliminates software-based Xon/Xoff parsing; prevents RX buffer overflow and TX underflow without CPU intervention. |
| IrDA 1.0 encoder/decoder | On-die SIR modulation/demodulation supports 115.2 kbit/s infrared links - removes need for discrete IrPHY ICs. |
| Sleep mode with floating XTAL2 | Reduces quiescent current to <10 µA; XTAL2 floats automatically to minimize leakage during idle periods. |
| 16C450 software compatibility | Power-on reset configures registers identically to 16C450; existing drivers require no modification for basic operation. |
Applications
| Industrial PLC Serial Port Expansion | Legacy Medical Device Interface |
|---|---|
Use Scenario: Adding isolated RS-232 ports to programmable logic controllers for HMI and SCADA communication over noisy factory floors. IC Role / Device Role / Timing Role: UART interface bridge converting parallel bus transactions to robust asynchronous serial streams with hardware flow control and error detection. Use Value: 32-byte FIFOs absorb burst traffic from multiple sensors; 5 V-tolerant inputs withstand ESD events; industrial temp rating ensures uptime in unconditioned enclosures. | Use Scenario: Enabling bidirectional data exchange between embedded microcontrollers and legacy diagnostic equipment using RS-232 or infrared. IC Role / Device Role / Timing Role: Asynchronous serial protocol translator with IrDA 1.0 PHY and configurable framing (5–8 bit, parity, stop bits). Use Value: Eliminates external IrDA transceiver; sleep mode extends battery life in portable diagnostics; auto-CTS prevents data loss during high-throughput ECG waveform transfer. |
| Point-of-Sale Terminal Modem Link | Telecom Infrastructure Management Card |
Use Scenario: Connecting credit card readers and receipt printers to central POS servers via dial-up modems in retail environments. IC Role / Device Role / Timing Role: High-reliability UART with modem control lines (DTR/DSR/RI/DCD) and automatic hardware handshaking. Use Value: Auto-RTS/CTS synchronizes data flow with modem buffer states; 3 Mbit/s capability future-proofs for faster V.92/V.90 modems; PLCC44 package supports rework-friendly through-hole assembly. | Use Scenario: Providing out-of-band management serial console access on carrier-grade Ethernet switches and routers. IC Role / Device Role / Timing Role: Dedicated management UART with DMA-ready TXRDY/RXRDY signals and prioritized interrupt handling for watchdog-safe CLI access. Use Value: Multi-transfer DMA moves large configuration dumps without CPU stalls; false start-bit detection improves CLI reliability over long cables; 2.5 V operation lowers power in dense line-card designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar UART applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ST16C650B | Pin-compatible but lacks IrDA encoder/decoder; identical FIFO depth, flow control, and register map. | No infrared capability; requires external IrPHY for IrDA use cases. | Select ST16C650B only if IrDA is unused and second-source assurance is required from STMicroelectronics. |
| TL16C750IPM | TI part with 64-byte FIFOs, enhanced DMA, and integrated 1.8 V I/O buffers; not pin-compatible with SC16C650BIA44,512. | Higher FIFO capacity suits high-throughput networking gear; requires PCB redesign due to LQFP48 footprint and voltage translation. | Choose TL16C750IPM for new designs needing >32-byte buffering or 1.8 V logic compatibility; not a drop-in replacement. |
Compared with ST16C650B and TL16C750IPM, SC16C650BIA44,512 uniquely integrates IrDA 1.0 PHY in a PLCC44 package while maintaining 16C450 software compatibility - making it optimal for cost-sensitive industrial upgrades where infrared diagnostics or legacy serial coexistence is required.
Availability
SC16C650BIA44,512 is available at Aetrix Electronics and suitable for industrial PLC serial port expansion, legacy medical device interface, and point-of-sale terminal modem link applications requiring stable component supply across extended product lifecycles.
Supply support for SC16C650BIA44,512 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 formed from the spin-off of Philips' semiconductor division, specializing in secure connectivity solutions for automotive, industrial, and IoT markets.
The SC16C650BIA44,512 belongs to NXP's legacy UART product line designed for industrial and telecom infrastructure applications requiring robust, software-compatible serial interface expansion with enhanced FIFO and IrDA capabilities.
FAQ
What is the maximum data rate supported by the SC16C650BIA44,512 and under what conditions?
The SC16C650BIA44,512 supports up to 3 Mbit/s transmit/receive operation when powered at 5 V with a 48 MHz external clock input. At 3.3 V, the maximum rate is 2 Mbit/s, and at 2.5 V it is limited to 1 Mbit/s. These limits are defined by internal timing margins and verified in the original Philips product data sheet Rev. 03. The SC16C650BIA44,512 achieves this performance using a 16× oversampling architecture with programmable divisor latches (DLL/DLM) and MCR[7] divide-by-4 option.
Does the SC16C650BIA44,512 support infrared communication, and if so, what standard and speed?
Yes, the SC16C650BIA44,512 integrates a dedicated IrDA 1.0 encoder/decoder supporting the Serial Infrared (SIR) physical layer at up to 115.2 kbit/s. This capability is implemented entirely on-die with no external components required. The SC16C650BIA44,512 complies with IrDA 1.0 timing specifications for pulse width and duty cycle, and its IrDA function operates independently of the standard UART path, sharing only the TX/RX pins via internal multiplexing controlled by the Enhanced Feature Register.
How does the SC16C650BIA44,512 handle hardware flow control, and what pins are involved?
The SC16C650BIA44,512 supports automatic hardware flow control via RTS and CTS pins using dedicated logic that monitors RX FIFO fill level and remote CTS state. In auto-CTS mode, transmission halts immediately after the current character's stop bit when CTS goes inactive; in auto-RTS mode, RTS deasserts when RX FIFO exceeds the programmed trigger level and reasserts only after falling below the next lower threshold. This behavior is configured via EFR bits 6 and 7, and the SC16C650BIA44,512 implements these functions without CPU intervention.
Is the SC16C650BIA44,512 pin-compatible with older UARTs, and which ones specifically?
Yes, the SC16C650BIA44,512 is pin-compatible with the ST16C650A and functionally backward-compatible with the industry-standard 16C450 upon power-up reset. It also maintains pin alignment with TL16C450/550 and PC16C450/550 families in PLCC44, LQFP48, and DIP40 packages. However, full utilization of 32-byte FIFOs, IrDA, and auto-flow features requires register programming beyond 16C450 defaults - the SC16C650BIA44,512 retains identical pinout and electrical signaling for seamless board-level replacement.
What power supply configurations and temperature range does the SC16C650BIA44,512 support?
The SC16C650BIA44,512 operates across three supply voltages: 2.5 V ±10%, 3.3 V ±10%, or 5 V ±10%, with 5 V-tolerant inputs enabling mixed-voltage system integration. It is rated for the industrial temperature range of −40 °C to +85 °C, validated per original Philips specification Rev. 03. This rating applies to all supported packages including the PLCC44 variant SC16C650BIA44,512, and thermal performance has been characterized under continuous 3 Mbit/s operation at maximum ambient temperature.
SC16C650BIA44,512 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 44-LCC (J-Lead)
- Series:
- -
- Packaging:
- Tube
- 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:
- 44-PLCC (16.59x16.59)
SC16C650BIA44,512 FAQ
1.How can I place an order for SC16C650BIA44,512 through Aetrix?
Please submit a Request for Quotation (RFQ) for SC16C650BIA44,512 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 SC16C650BIA44,512 reliable?
The price and inventory of SC16C650BIA44,512 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC16C650BIA44,512 is usually 5 days.
3.What payment methods are accepted for SC16C650BIA44,512?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC16C650BIA44,512 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC16C650BIA44,512?
SC16C650BIA44,512 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC16C650BIA44,512 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 SC16C650BIA44,512?
For technical support, including SC16C650BIA44,512 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC16C650BIA44,512 requirements.
6.How does Aetrix verify that SC16C650BIA44,512 is sourced from the original manufacturer or authorized distributors?
All SC16C650BIA44,512 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 SC16C650BIA44,512 meets industry standards.
7.What is the process for return or replacement of SC16C650BIA44,512?
All SC16C650BIA44,512 units undergo pre-shipment inspection (PSI). If there is an issue with SC16C650BIA44,512, 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 SC16C650BIA44,512 part is unused and in its original packaging.
Return procedure for SC16C650BIA44,512:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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