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NXP Semiconductors SC16C650AIA44,512
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- Part No.:
- SC16C650AIA44,512
- Manufacturer:
- NXP Semiconductors
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
SC16C650AIA44,512.pdf
- Description:
- IC UART 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,689
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Product details
Overview
SC16C650AIA44,512 from NXP Semiconductors (formerly Philips) is a 32-byte FIFO Universal Asynchronous Receiver/Transmitter (UART) IC supporting IrDA encoder/decoder, hardware/software flow control, and programmable baud rates up to 3 Mbit/s at 5 V. It operates across 2.5 V, 3.3 V, and 5 V supply rails within −40 °C to +85 °C, and is packaged in PLCC44 for industrial serial communication interfaces in embedded controllers and modem subsystems.
For engineers reviewing the SC16C650AIA44,512 datasheet, SC16C650AIA44,512 pinout, SC16C650AIA44,512 application, or SC16C650AIA44,512 equivalent, key selection criteria include FIFO trigger level configurability, auto-RTS/CTS support, IrDA interface capability, 3-State TTL bus compatibility, and multi-voltage operation - all validated for legacy 16C450 software compatibility and ST16C650A pin equivalence.
Technical Context
The SC16C650AIA44,512 implements dual 32-byte FIFOs with independently programmable transmit/receive trigger levels (8/16/24/28 bytes), enabling high-throughput DMA transfers via RXRDY/TXRDY signals and reducing CPU interrupt load. Its enhanced feature register (EFR) enables automatic hardware flow control (RTS/CTS), software Xon/Xoff detection, and special character handling without data stacking.
It integrates a fully programmable 16× baud rate generator accepting up to 48 MHz input clock, supports independent TX/RX clocking via RCLK, and includes infrared encoding/decoding circuitry compliant with IrDA 1.0 physical layer requirements. Internal loop-back mode and false start-bit detection provide on-chip diagnostics for link integrity verification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.5 V / 3.3 V / 5 V ±10% - supports mixed-voltage system integration without level shifters |
| Max Data Rate | 3 Mbit/s at 5 V (with 48 MHz clock) - enables high-speed modem and ISDN interface designs |
| FIFO Depth | 32-byte TX + 32-byte RX with error flags - reduces interrupt frequency by >75% vs. 16C450 (0-byte FIFO) |
| Interrupt Flexibility | Four selectable FIFO trigger levels + prioritized interrupt system - allows precise latency/response tuning per channel |
| Flow Control | Programmable auto-RTS/CTS + Xon/Xoff (1- or 2-byte) - eliminates software polling overhead in multi-channel systems |
| IrDA Support | Integrated encoder/decoder - enables direct infrared physical layer connectivity without external transceivers |
| Operating Temp | −40 °C to +85 °C - qualified for industrial and extended-temperature embedded applications |
Pinout & Package
SC16C650AIA44,512 is housed in a plastic leaded chip carrier (PLCC44) package with 44 leads, 1.27 mm pitch, and JEDEC-standard SOT187-2 footprint. Pin layout supports standard ISA bus timing and 3-State TTL-compatible data/control buses.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D0–D7 | Data Bus I/O | Bi-directional 8-bit parallel interface with 3-State TTL drive - connects directly to microprocessor data bus |
| A0–A2 | Register Address Select | Selects internal UART register (THR/RHR/IER/FCR/etc.) during read/write cycles - enables full register access with minimal address lines |
| IOR / IOW | Read/Write Strobe Inputs | Asymmetric active-HIGH/LOW strobes - compatible with both Intel- and Motorola-style bus protocols |
| CS0–CS2 | Chip Select Logic | 3-input decode (CS0=H, CS1=H, CS2=L) - allows multiple UARTs on shared bus without address decoding logic |
| TX / RX | Serial Data I/O | Asynchronous TTL-level transmit/receive paths - supports RS-232/RS-485 transceivers or direct IrDA PHY connection |
| RTS / CTS | Hardware Flow Control | Auto-controlled outputs/inputs - RTS asserted when RX FIFO exceeds threshold; CTS halts TX on remote buffer full |
| RXRDY / TXRDY | DMA Ready Signals | Active-LOW DMA handshake - enables burst-mode memory transfers without CPU intervention in FIFO mode |
| BAUDOUT | 16× Baud Clock Output | Provides exact 16× reference clock for external receiver or local clock synchronization - eliminates need for separate oscillator |
Key Features
| Feature | Design Value |
|---|---|
| Multi-voltage operation | Single device supports 2.5 V, 3.3 V, and 5 V logic domains - simplifies migration across legacy and modern host platforms |
| IrDA 1.0 PHY integration | On-die infrared encoder/decoder - eliminates discrete IrDA transceiver and associated analog components |
| Auto-RTS/CTS with threshold control | RTS deassertion triggered at user-defined RX FIFO fill level (8/16/24/28 bytes) - prevents overrun without software polling |
| Sleep mode with XTAL2 float | Reduces quiescent current during idle periods while preserving oscillator restart capability - extends battery life in portable systems |
| 16C450 register compatibility | Power-on reset defaults to 16C450 register map - ensures drop-in replacement for existing BIOS/driver stacks |
| False start-bit detection | Rejects spurious noise-induced framing errors - improves reliability in electrically noisy industrial environments |
Applications
| Industrial Modem Interface | Embedded Serial Console |
|---|---|
Use Scenario: High-speed dial-up and leased-line modems in factory automation gateways requiring reliable data framing and flow control under EMI stress. IC Role / Device Role / Timing Role: UART performs parallel-to-serial conversion, manages RTS/CTS handshaking, and generates precise baud clocks for 33.6 kbit/s+ modem links. Use Value: 32-byte FIFOs reduce interrupt servicing time by >80% versus 16C450, enabling concurrent protocol stack execution on resource-constrained MCUs. |
Use Scenario: Debug and configuration port on industrial PLCs and HMI panels where serial console access must remain available during firmware updates. IC Role / Device Role / Timing Role: Provides asynchronous serial interface between ARM Cortex-M host and external terminal, with sleep mode for low-power standby. Use Value: Auto-RTS assertion at 16-byte RX threshold prevents buffer overflow during burst command uploads, eliminating lost debug commands. |
| IrDA Remote Control Hub | Multi-Channel POS Terminal |
Use Scenario: Infrared-based point-of-sale peripherals (barcode scanners, signature pads) communicating with central kiosk via line-of-sight IR link. IC Role / Device Role / Timing Role: Implements IrDA 1.0 physical layer encoding/decoding and handles variable-length packet framing at up to 115.2 kbit/s. Use Value: Integrated IrDA logic avoids external SIR/FIR transceiver ICs, cutting BOM cost and PCB area by 30% in compact handheld enclosures. |
Use Scenario: Payment terminal aggregating magnetic stripe, EMV chip, and PIN pad data over isolated serial channels before encryption and transmission. IC Role / Device Role / Timing Role: Manages four independent serial streams using shared interrupt vector and configurable FIFO trigger levels per channel. Use Value: Independent TX/RX trigger programming allows optimized latency for real-time PIN entry (low threshold) vs. batch EMV log upload (high threshold). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar UART applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ST16C650BIP44 | Pin-compatible but lacks IrDA encoder/decoder; supports only 2.5 V/3.3 V (no 5 V) | Not suitable for legacy 5 V systems or infrared PHY implementations | Select only if IrDA is unused and 5 V operation is unnecessary |
| TL16C750IPM | Enhanced 64-byte FIFO, supports 16 MHz max crystal (vs. 48 MHz), no IrDA block | Higher throughput in pure RS-232 applications but requires external IR transceiver | Prefer for high-channel-count industrial servers where IrDA is absent and FIFO depth is critical |
Compared with ST16C650BIP44 and TL16C750IPM, the SC16C650AIA44,512 uniquely delivers IrDA PHY integration and 5 V tolerance in a single PLCC44 package - making it the only option for cost-sensitive, infrared-enabled, mixed-voltage industrial serial nodes.
Availability
SC16C650AIA44,512 is available at Aetrix Electronics and suitable for industrial modem interfaces, embedded serial consoles, IrDA remote control hubs, and multi-channel POS terminals requiring stable component supply across long-lifecycle production programs.
Supply support for SC16C650AIA44,512 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, formerly Philips Semiconductors, designs high-reliability interface ICs for industrial, automotive, and communications markets with emphasis on interoperability and long-term supply assurance.
The SC16C650AIA44,512 belongs to NXP's legacy UART product line, engineered specifically for backward-compatible serial communication upgrades in industrial control, telecom infrastructure, and embedded computing systems.
FAQ
What voltage levels does the SC16C650AIA44,512 support?
The SC16C650AIA44,512 supports three operating voltages: 2.5 V ±10%, 3.3 V ±10%, and 5 V ±10%. This multi-rail capability allows direct integration into mixed-voltage systems without external level-shifting circuitry. All I/O pins are 5 V tolerant when operated at lower supply voltages, and the device maintains full specification compliance across the industrial temperature range of −40 °C to +85 °C. The SC16C650AIA44,512 achieves this through advanced CMOS process optimization and internal voltage regulation.
Does the SC16C650AIA44,512 include IrDA functionality?
Yes, the SC16C650AIA44,512 integrates a complete IrDA 1.0-compliant encoder/decoder block. It supports SIR (Serial Infrared) at up to 115.2 kbit/s and handles pulse shaping, NRZI encoding, and RZI decoding internally. No external infrared transceiver is required - only an IR LED and photodiode with current-limiting resistors are needed for physical layer implementation. This IrDA capability is confirmed in the General Description and Block Diagram sections of the official Philips SC16C650A datasheet Rev. 04.
Is the SC16C650AIA44,512 pin-compatible with other UARTs?
Yes, the SC16C650AIA44,512 is explicitly pin-compatible with the ST16C650A and functionally equivalent to the 16C450 at power-up. Its PLCC44 pinout matches industry-standard layouts for UARTs in that package, including identical placement of D0–D7, A0–A2, IOR/IOW, CS0–CS2, TX/RX, and RTS/CTS. This allows direct replacement in existing 16C450/16C550-based designs without PCB modification, provided the target application does not require features exclusive to newer variants like the TL16C750.
What FIFO configurations does the SC16C650AIA44,512 support?
The SC16C650AIA44,512 provides independent 32-byte transmit and receive FIFOs, each configurable with four trigger levels: 8, 16, 24, or 28 characters. Trigger levels determine interrupt generation and DMA signal activation (RXRDY/TXRDY). Unlike earlier 16C550 devices, the SC16C650AIA44,512 allows full programming of both TX and RX trigger thresholds via the FIFO Control Register (FCR) and Enhanced Feature Register (EFR), enabling asymmetric buffering strategies for asymmetric traffic patterns.
How does hardware flow control work on the SC16C650AIA44,512?
Hardware flow control on the SC16C650AIA44,512 operates via auto-RTS and auto-CTS modes enabled through the Enhanced Feature Register. In auto-RTS mode, the RTS output is deasserted when the receive FIFO drops below the programmed trigger level and reasserted when it reaches that level - preventing RX buffer overflow. In auto-CTS mode, the transmitter halts immediately upon CTS deassertion (logic 0) and resumes when CTS returns high. Both functions are implemented in hardware, eliminating software polling and reducing CPU overhead by up to 90% in high-throughput scenarios.
SC16C650AIA44,512 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)
SC16C650AIA44,512 FAQ
1.How can I place an order for SC16C650AIA44,512 through Aetrix?
Please submit a Request for Quotation (RFQ) for SC16C650AIA44,512 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 SC16C650AIA44,512 reliable?
The price and inventory of SC16C650AIA44,512 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC16C650AIA44,512 is usually 5 days.
3.What payment methods are accepted for SC16C650AIA44,512?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC16C650AIA44,512 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC16C650AIA44,512?
SC16C650AIA44,512 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC16C650AIA44,512 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 SC16C650AIA44,512?
For technical support, including SC16C650AIA44,512 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC16C650AIA44,512 requirements.
6.How does Aetrix verify that SC16C650AIA44,512 is sourced from the original manufacturer or authorized distributors?
All SC16C650AIA44,512 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 SC16C650AIA44,512 meets industry standards.
7.What is the process for return or replacement of SC16C650AIA44,512?
All SC16C650AIA44,512 units undergo pre-shipment inspection (PSI). If there is an issue with SC16C650AIA44,512, 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 SC16C650AIA44,512 part is unused and in its original packaging.
Return procedure for SC16C650AIA44,512:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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