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NXP Semiconductors SC16C650AIN40,112
- Part No.:
- SC16C650AIN40,112
- Manufacturer:
- NXP Semiconductors
- Package:
- 40-DIP (0.600", 15.24mm)
- Datasheet:
-
SC16C650AIN40,112.pdf
- Description:
- IC UART SINGLE W/FIFO 40-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,318
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Product details
Overview
SC16C650AIN40,112 from NXP Semiconductors (formerly Philips) is a 5 V/3.3 V/2.5 V universal asynchronous receiver/transmitter (UART) IC used for serial data conversion in embedded host interfaces. It features 32-byte transmit and receive FIFOs, IrDA encoder/decoder, programmable auto-RTS/CTS flow control, and supports up to 3 Mbit/s at 5 V in DIP40 package.
For engineers reviewing the SC16C650AIN40,112 datasheet, SC16C650AIN40,112 pinout, SC16C650AIN40,112 application, or SC16C650AIN40,112 equivalent, key selection criteria include FIFO depth, IrDA support, voltage scalability (2.5–5 V), industrial temperature range (−40 °C to +85 °C), and compatibility with legacy 16C450 software stacks.
Technical Context
The SC16C650AIN40,112 implements a dual-FIFO architecture with independent 32-byte TX/RX buffers, four selectable FIFO trigger levels, and hardware/software flow control logic tied to RTS/CTS and Xon/Xoff registers. Its baud rate generator accepts up to 48 MHz input clock and delivers precise rates via 16× division with optional ×4 prescaling (MCR[7]).
It integrates full modem control (DTR, DSR, RI, DCD), internal loop-back diagnostics, sleep mode, false start-bit detection, and prioritized interrupt handling-including separate TXRDY/RXRDY DMA signaling outputs. The IrDA encoder/decoder operates per IrDA 1.0 physical layer spec, enabling infrared communication without external transceivers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Data Rate | 3 Mbit/s at 5 V (enables high-speed modem and ISDN interface support) |
| FIFO Depth | 32-byte TX and RX buffers (reduces CPU interrupt load by ~6× vs. 16C450) |
| Supply Voltage | 2.5 V / 3.3 V / 5 V ±10% (supports mixed-voltage system integration) |
| Operating Temp | −40 °C to +85 °C (qualified for industrial embedded applications) |
| Package | DIP40 (600 mil, through-hole mounting; compatible with legacy PCB layouts) |
| IrDA Support | Integrated encoder/decoder per IrDA 1.0 (eliminates need for external IR PHY) |
| Interrupt Sources | Independent TXRDY, RXRDY, line status, modem status, and FIFO timeout (enables fine-grained ISR handling) |
Pinout & Package
SC16C650AIN40,112 is housed in a plastic dual in-line package (DIP40) with 40 leads (600 mil width), designed for through-hole mounting and legacy board compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D0–D7 | Data bus I/O | 8-bit bidirectional parallel interface to CPU; 3-state TTL drive enables shared bus operation |
| A0–A2 | Register address select | Selects among 8 internal register sets (THR/RHR, IER/ISR, LCR, MCR, etc.) |
| IOR / IOW | Read/write strobes | Asymmetric active-low/high logic allows flexible CPU bus timing alignment |
| TX / RX | Serial I/O | Full-duplex UART channel; TX output includes marking-level default after reset |
| RTS / CTS | Hardware flow control | Programmable auto-RTS (FIFO threshold-driven) and auto-CTS (transmit gating) |
| INT / TXRDY / RXRDY | Interrupt & DMA signaling | INT asserts on FIFO/line/modem events; TXRDY/RXRDY enable burst-mode DMA transfers |
| XTAL1 / XTAL2 | Crystal oscillator interface | Supports 1.8432 MHz to 48 MHz crystal or external clock; XTAL2 floats in sleep mode |
| RESET | Master reset input | Active-high synchronous reset initializes all registers to 16C450-compatible state |
Key Features
| Feature | Design Value |
|---|---|
| 32-byte TX/RX FIFOs | Reduces CPU polling overhead and enables reliable high-throughput serial streaming |
| IrDA 1.0 encoder/decoder | Direct infrared PHY support eliminates external transceiver and simplifies IR design |
| Auto-RTS/CTS flow control | Hardware-managed RTS assertion based on RX FIFO fill level prevents buffer overflow |
| Four FIFO trigger levels | Configurable interrupt thresholds (8/16/24/28 bytes) optimize latency vs. interrupt frequency trade-off |
| Software Xon/Xoff support | Programmable 1- or 2-byte Xon/Xoff characters enable robust protocol-level flow management |
| Sleep mode | Reduces power consumption during idle periods while preserving register state |
Applications
| Industrial PLC Serial Gateway | Legacy PC Expansion Card |
|---|---|
|
Use Scenario: Connecting RS-232 field devices (sensors, actuators) to a microcontroller-based PLC backplane with limited interrupt bandwidth. IC Role / Device Role / Timing Role: UART bridge converting parallel CPU bus transactions into framed asynchronous serial streams with hardware flow control. Use Value: 32-byte FIFOs reduce CPU servicing frequency by >80% vs. 16C450, enabling deterministic real-time response in multi-channel I/O systems. |
Use Scenario: Adding dual RS-232 ports to ISA-bus expansion cards for retro-computing or industrial PC upgrades. IC Role / Device Role / Timing Role: Drop-in 16C450-compatible UART with enhanced FIFO and IrDA, maintaining BIOS/DOS driver compatibility. Use Value: Pin-compatible DIP40 footprint allows direct replacement of obsolete 16C550 parts while adding IrDA and sleep mode for new functionality. |
| Medical Device Serial Interface | Point-of-Sale Terminal Modem Link |
|
Use Scenario: Isolating ECG or infusion pump telemetry over RS-232 while meeting IEC 60601-1 safety and EMC requirements. IC Role / Device Role / Timing Role: Isolated UART front-end with error reporting (parity/framing/break detection) and diagnostic loop-back. Use Value: On-chip false start-bit detection and complete status registers simplify fault logging and improve diagnostic coverage for regulatory compliance. |
Use Scenario: Enabling dial-up credit card authorization via PSTN modem in retail terminals using low-cost 2.5 V/3.3 V logic. IC Role / Device Role / Timing Role: High-reliability UART supporting 115.2 kbit/s and 460.8 kbit/s modem data rates with automatic Xon/Xoff negotiation. Use Value: Programmable baud generator with 48 MHz clock support ensures accurate timing for V.34/V.90 modems without external PLL components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar UART applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ST16C650BIA44 | Same 32-byte FIFO and IrDA, but PLCC44 package; no DIP40 variant available | Requires PCB redesign for surface-mount assembly; lacks through-hole option | Select when space-constrained SMT layout is preferred and legacy DIP40 is not required |
| TL16C750IPN | 32-byte FIFO, no IrDA; supports 5 V only; different register mapping for enhanced features | Not suitable for infrared applications; requires firmware adaptation for EFR access | Choose for cost-sensitive 5 V-only designs where IrDA is unnecessary and software porting effort is acceptable |
Compared with ST16C650BIA44 and TL16C750IPN, the SC16C650AIN40,112 uniquely combines DIP40 packaging, triple-voltage operation, and integrated IrDA-making it the only drop-in solution for upgrading legacy industrial boards with infrared capability and backward-compatible software.
Availability
SC16C650AIN40,112 is available at Aetrix Electronics and suitable for industrial PLC gateways, medical telemetry interfaces, point-of-sale terminal modems, and legacy PC expansion cards requiring stable component supply across extended product lifecycles.
Supply support for SC16C650AIN40,112 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 (originally Philips Semiconductors) is a global leader in high-performance mixed-signal ICs for automotive, industrial, and communication applications.
The SC16C650AIN40,112 belongs to NXP's legacy UART family designed for robust serial communication in industrial control, medical instrumentation, and embedded computing-prioritizing pin compatibility, wide voltage operation, and diagnostic integrity.
FAQ
What voltage levels does the SC16C650AIN40,112 support?
The SC16C650AIN40,112 operates at 2.5 V, 3.3 V, or 5 V ±10%, with full specification compliance across all three supply rails. This allows seamless integration into mixed-voltage systems without level-shifting circuitry. The SC16C650AIN40,112 maintains identical timing and functional behavior regardless of selected VCC, making it ideal for upgrading legacy 5 V designs to lower-power 3.3 V or 2.5 V operation.
Does the SC16C650AIN40,112 support IrDA communication out of the box?
Yes, the SC16C650AIN40,112 includes a fully integrated IrDA 1.0 encoder/decoder compliant with the physical layer specification. No external IR transceiver is needed-only a simple IR LED and photodiode circuit connected to TX/RX pins is required. The SC16C650AIN40,112 handles pulse shaping, encoding (RZI), and decoding internally, reducing BOM count and board area versus discrete solutions.
Is the SC16C650AIN40,112 pin-compatible with older UARTs like the 16C450?
After reset, the SC16C650AIN40,112 powers up in 16C450-compatible mode with identical register map and timing behavior. It is pin-compatible with ST16C650A and functionally compatible with TL16C450/550 families. The SC16C650AIN40,112 retains all legacy signals (IOR/IOW, CS0–CS2, INT, RTS/CTS) in identical DIP40 pin locations, enabling direct replacement without PCB modification.
How does the SC16C650AIN40,112 handle flow control in high-speed applications?
The SC16C650AIN40,112 supports both automatic hardware (RTS/CTS) and software (Xon/Xoff) flow control. Auto-RTS dynamically asserts RTS when RX FIFO reaches a user-programmed threshold (8/16/24/28 bytes); auto-CTS halts transmission upon CTS deassertion. This eliminates software polling and ensures zero-loss throughput at up to 3 Mbit/s-critical for modem and network interface applications using the SC16C650AIN40,112.
What is the maximum crystal frequency supported by the SC16C650AIN40,112?
The SC16C650AIN40,112 accepts an external clock or crystal up to 48 MHz on XTAL1, enabling reliable operation at its maximum 3 Mbit/s data rate (48 MHz ÷ 16 = 3 MHz). With MCR[7] set, a ×4 prescaler extends effective range to 192 MHz equivalent. The SC16C650AIN40,112 also supports standard crystals (e.g., 1.8432 MHz, 3.072 MHz) for legacy baud rates, with error <0.1% across common telecom standards.
SC16C650AIN40,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 40-DIP (0.600", 15.24mm)
- 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:
- Through Hole
- Supplier Device Package:
- 40-DIP
SC16C650AIN40,112 FAQ
1.How can I place an order for SC16C650AIN40,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for SC16C650AIN40,112 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 SC16C650AIN40,112 reliable?
The price and inventory of SC16C650AIN40,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC16C650AIN40,112 is usually 5 days.
3.What payment methods are accepted for SC16C650AIN40,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC16C650AIN40,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC16C650AIN40,112?
SC16C650AIN40,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC16C650AIN40,112 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 SC16C650AIN40,112?
For technical support, including SC16C650AIN40,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC16C650AIN40,112 requirements.
6.How does Aetrix verify that SC16C650AIN40,112 is sourced from the original manufacturer or authorized distributors?
All SC16C650AIN40,112 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 SC16C650AIN40,112 meets industry standards.
7.What is the process for return or replacement of SC16C650AIN40,112?
All SC16C650AIN40,112 units undergo pre-shipment inspection (PSI). If there is an issue with SC16C650AIN40,112, 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 SC16C650AIN40,112 part is unused and in its original packaging.
Return procedure for SC16C650AIN40,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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