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NXP Semiconductors SC16C550BIN40,112
- Part No.:
- SC16C550BIN40,112
- Manufacturer:
- NXP Semiconductors
- Package:
- 40-DIP (0.600", 15.24mm)
- Datasheet:
-
SC16C550BIN40,112.pdf
- Description:
- IC UART 40-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,434
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Product details
Overview
SC16C550BIN40,112 from NXP Semiconductors is a 5 V/3.3 V/2.5 V universal asynchronous receiver/transmitter (UART) IC with 16-byte transmit and receive FIFOs, supporting serial data rates up to 3 Mbit/s at 5 V, and operating across the industrial temperature range (−40 °C to +85 °C). It implements full modem control (CTS, RTS, DTR, DSR, DCD, RI), programmable baud rate generation, and hardware flow control - deployed in embedded industrial controllers for RS-232/RS-485 interface bridging.
For engineers reviewing the SC16C550BIN40,112 datasheet, SC16C550BIN40,112 pinout, SC16C550BIN40,112 application, or SC16C550BIN40,112 equivalent, key selection criteria include FIFO-triggered interrupt levels, auto-RTS/CTS timing behavior, voltage-flexible I/O compatibility, and DIP40 package suitability for legacy board-level integration and manual prototyping.
Technical Context
The SC16C550BIN40,112 implements a register-compatible extension of the 16C450 architecture, powering up with identical register mapping and software compatibility. Its dual 16-byte FIFOs reduce CPU interrupt load by enabling burst-mode DMA signaling via RXRDY/TXRDY outputs - though these signals are excluded in HVQFN32 variants, they remain fully functional in this DIP40 package.
It integrates a programmable 16× baud rate generator accepting up to 48 MHz input clocks, supports four configurable receive FIFO trigger levels (1/4/8/14 bytes), and provides independent transmitter/receiver clocking with RCLK input and BAUDOUT output. Auto-RTS and auto-CTS are enabled via MCR[5] and MCR[1], with RTS de-assertion timed precisely to FIFO fill level per IEEE 1394-style flow control logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.5 V, 3.3 V, or 5 V ±10 % - enables direct interfacing with mixed-voltage microcontrollers without level shifters. |
| Max Data Rate | 3 Mbit/s at 5 V (48 MHz clock); 2 Mbit/s at 3.3 V; 1 Mbit/s at 2.5 V - defines maximum throughput for high-speed modem or multi-drop bus applications. |
| FIFO Depth | 16-byte TX and RX FIFOs - reduces host CPU interrupt frequency by ~16× versus 16C450, lowering system latency and power. |
| Interrupt Control | Four selectable RX FIFO trigger levels (1/4/8/14 bytes) + independent TX/RX/line/modem interrupt enables - allows precise tuning of interrupt latency vs. bandwidth trade-offs. |
| Modem Interface | Full six-signal modem control (CTS, RTS, DTR, DSR, DCD, RI) with change-of-state detection and interrupt enable - supports legacy dial-up, fax, and industrial telemetry protocols. |
| Operating Temp | −40 °C to +85 °C - qualified for deployment in uncontrolled industrial enclosures, factory automation, and outdoor communications equipment. |
| Package | DIP40 (600 mil) - supports through-hole mounting, breadboard evaluation, and long-term serviceability in field-replaceable modules. |
Pinout & Package
SC16C550BIN40,112 is housed in a plastic dual in-line package (DIP40) with 40 leads, 600 mil width, and standard 0.1″ pin pitch - optimized for legacy PCB layouts, manual soldering, and socket-based test fixtures.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D0–D7 | Data bus I/O | 8-bit bidirectional parallel interface to CPU or microcontroller data bus; 3-state TTL drive enables shared bus operation. |
| A0–A2 | Register address select | 3-bit address lines selecting one of eight internal UART registers (THR/RHR, IER, ISR, FCR, LCR, MCR, LSR, MSR) per Table 3. |
| IOR / IOW | Read/write strobes | Active-low read and write control signals; either IOR or IOR (complementary) may be used depending on CPU bus polarity. |
| CS0–CS2 | Chip select inputs | 3-input decode logic requiring CS0=HIGH, CS1=HIGH, CS2=LOW to activate device - supports multiple UARTs on same bus. |
| TX / RX | Serial data I/O | Asynchronous serial output (TX) and input (RX); compatible with RS-232 line drivers (e.g., MAX232) or direct TTL-level links. |
| RTS / CTS | Hardware flow control | Request-to-send (output) and clear-to-send (input) pins enabling automatic pause/resume of transmission based on RX FIFO fill level. |
| INT | Interrupt output | Open-drain or push-pull (configurable) active-HIGH interrupt signal indicating pending RX/TX/line/modem events. |
| RESET | Master reset input | Active-HIGH signal clearing all internal registers and initializing outputs to default states (e.g., TX HIGH, RTS HIGH). |
| XTAL1 / XTAL2 | Crystal oscillator interface | Supports external crystal (1.8432 MHz typical) or single-ended clock input to generate baud-rate reference; internal 16× divider feeds BAUDOUT and RCLK. |
| RCLK / BAUDOUT | Receiver clock / baud out | RCLK accepts external 16× baud clock; BAUDOUT outputs 16× selected baud rate - usable as RCLK source in master-slave configurations. |
| TXRDY / RXRDY | DMA ready signals | Active-LOW handshake outputs for DMA controller coordination; support both single- and multi-transfer modes per FCR[3] setting. |
| VDD / VSS | Power supply | Single-supply operation at 2.5 V, 3.3 V, or 5 V; VSS must be connected to system ground; no separate analog/digital rail required. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-RTS/CTS flow control | RTS de-asserted when RX FIFO reaches 1/4/8/14-byte threshold; CTS monitored before each TX byte - eliminates overrun errors without CPU polling. |
| Programmable baud generation | Divisor latch (DLL/DLM) accepts 16-bit values to set any baud rate from 50 bps to 3 Mbit/s using 48 MHz max clock - supports custom ISDN, V.34, and proprietary protocols. |
| False start-bit detection | Hardware logic rejects spurious leading edges on RX line - improves noise immunity in electrically noisy industrial environments (e.g., motor drives, PLC cabinets). |
| Internal loopback mode | Configured via MCR[4]; routes TX output directly to RX input - enables on-board diagnostics without external cabling or loopback adapters. |
| Complete status reporting | LSR reports framing/parity/break/overrun errors; MSR tracks modem signal transitions (RI, DCD, DSR, CTS); ISR prioritizes pending interrupts - simplifies driver development and fault logging. |
Applications
| Industrial PLC Serial Gateway | Legacy PC Expansion Card |
|---|---|
Use Scenario: Integrating Modbus RTU sensors into a modern EtherCAT-based PLC rack via isolated RS-485 link. IC Role / Device Role / Timing Role: UART interface bridge converting parallel CPU bus transactions to asynchronous serial frames with precise 16× oversampling and error-checked framing. Use Value: 16-byte FIFOs absorb bursty sensor traffic while auto-RTS prevents buffer overflow during network congestion; DIP40 package enables easy replacement in field-serviceable backplane cards. | Use Scenario: Adding dual RS-232 ports to an ISA-bus industrial PC for connecting barcode scanners and weight scales. IC Role / Device Role / Timing Role: Bus-mastered UART co-processor handling serial protocol framing, parity generation, and interrupt-driven data buffering independently of x86 CPU cycles. Use Value: Pin compatibility with ST16C550/TL16C550 allows drop-in upgrade of aging ISA cards; 5 V tolerance on D0–D7 ensures robustness against bus noise in legacy systems. |
| Telecom Line Card Interface | Medical Device Diagnostic Port |
Use Scenario: Providing debug and configuration access to a VoIP gateway's DSP subsystem over RS-232 console port. IC Role / Device Role / Timing Role: Low-latency serial interface with hardware flow control ensuring reliable command/response exchange during firmware updates. Use Value: Four RX FIFO trigger levels allow tuning interrupt frequency to match host OS scheduling granularity; BAUDOUT output synchronizes external level shifters to exact baud timing. | Use Scenario: Exposing a secure UART-based bootloader interface on an FDA-cleared patient monitor for field firmware recovery. IC Role / Device Role / Timing Role: Isolated, fail-safe UART endpoint with false-start detection and break-signal generation for emergency reset sequences. Use Value: Internal loopback mode enables pre-deployment self-test of serial path integrity; industrial temp rating ensures reliability inside sealed medical enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar UART interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL16C550CPN | Identical pinout and register set; rated only for commercial temp (0 °C to +70 °C); no 2.5 V operation support. | Suitable for desktop PC add-in cards or lab equipment where ambient temperature is controlled. | Select TL16C550CPN only if industrial temperature range and 2.5 V operation are not required - lower cost but reduced environmental margin. |
| ST16C550CJ | Same DIP40 footprint and function; requires external 1.8432 MHz crystal only (no 48 MHz clock option); lacks TXRDY/RXRDY in some revisions. | Better suited for cost-sensitive consumer electronics where maximum data rate ≤ 115.2 kbit/s suffices. | Choose ST16C550CJ when legacy software compatibility is critical and high-speed modem support is unnecessary - verify RXRDY availability in specific date-code batches. |
Compared with TL16C550CPN and ST16C550CJ, SC16C550BIN40,112 uniquely delivers 2.5 V/3.3 V/5 V operation, −40 °C to +85 °C qualification, and guaranteed TXRDY/RXRDY support in DIP40 - making it the sole choice for ruggedized, multi-voltage, high-throughput industrial UART designs.
Availability
SC16C550BIN40,112 is available at Aetrix Electronics and suitable for industrial PLC gateways, legacy PC expansion cards, and telecom line card interfaces requiring stable component supply, long-lifecycle support, and through-hole manufacturability.
Supply support for SC16C550BIN40,112 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 is a global semiconductor leader specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with deep expertise in interface, power, and RF technologies.
The SC16C550B product line was designed to extend the industry-standard 16C450 UART architecture with enhanced FIFO depth, voltage flexibility, and hardware flow control - targeting industrial control, telecommunications infrastructure, and embedded computing platforms demanding interoperability and long-term availability.
FAQ
What voltage levels does the SC16C550BIN40,112 support, and how does that affect system design?
The SC16C550BIN40,112 operates at 2.5 V, 3.3 V, or 5 V ±10 %, allowing direct integration with mixed-voltage microcontrollers and legacy peripherals without external level shifters. Its 5 V-tolerant D0–D7 inputs simplify connection to older 5 V buses, while the single-supply architecture reduces PCB complexity and BOM count. This voltage flexibility makes SC16C550BIN40,112 ideal for upgrading aging systems while maintaining backward compatibility.
Does the SC16C550BIN40,112 support hardware flow control, and how is it implemented?
Yes, the SC16C550BIN40,112 supports full hardware flow control via RTS and CTS pins, with programmable auto-RTS and auto-CTS modes enabled by MCR[5] and MCR[1]. In auto-RTS mode, RTS de-asserts when the RX FIFO reaches a user-selected trigger level (1/4/8/14 bytes); in auto-CTS mode, the transmitter pauses before sending the next byte if CTS is inactive. This eliminates RX buffer overruns without CPU intervention - a core capability of SC16C550BIN40,112 in high-throughput serial links.
What is the maximum serial data rate achievable with the SC16C550BIN40,112, and what clock frequency is required?
The SC16C550BIN40,112 supports up to 3 Mbit/s at 5 V, requiring a 48 MHz input clock (e.g., applied to XTAL1). At 3.3 V, the maximum rate is 2 Mbit/s; at 2.5 V, it is 1 Mbit/s. The internal 16× baud rate generator derives BAUDOUT and RCLK from this clock, and the divisor latch (DLL/DLM) allows precise baud rate selection - for example, 921.6 kbit/s uses a divisor of 32 with a 48 MHz clock. This performance headroom is intrinsic to SC16C550BIN40,112's architecture.
How does the SC16C550BIN40,112 differ from the original 16C450 in terms of software compatibility and register behavior?
Upon reset, the SC16C550BIN40,112 initializes all registers identically to the 16C450, ensuring full compatibility with existing 16C450 drivers and BIOS code. It retains the same register map, bit definitions, and interrupt structure - meaning legacy software runs unchanged. The enhancements (16-byte FIFOs, auto-flow control, additional trigger levels) are accessed only when explicitly enabled, preserving backward compatibility while delivering measurable throughput gains. This seamless upgrade path is a defining feature of SC16C550BIN40,112.
Is internal loopback mode supported on the SC16C550BIN40,112, and how is it configured?
Yes, the SC16C550BIN40,112 supports internal loopback mode for on-board diagnostics. It is enabled by setting bit 4 (LOOP) of the Modem Control Register (MCR), which routes the TX output directly to the RX input path - bypassing external pins and physical cabling. This allows full functional testing of the UART's transmit shift register, receive logic, FIFOs, and interrupt generation without external hardware. Loopback mode is fully operational in SC16C550BIN40,112 and requires no package-specific restrictions.
SC16C550BIN40,112 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:
- 16 Byte
- Protocol:
- -
- Data Rate (Max):
- 3Mbps
- Voltage - Supply:
- 2.5V, 3.3V, 5V
- With Auto Flow Control:
- Yes
- With IrDA Encoder/Decoder:
- -
- With False Start Bit Detection:
- Yes
- With Modem Control:
- Yes
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 40-DIP
SC16C550BIN40,112 FAQ
1.How can I place an order for SC16C550BIN40,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for SC16C550BIN40,112 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 SC16C550BIN40,112 reliable?
The price and inventory of SC16C550BIN40,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC16C550BIN40,112 is usually 5 days.
3.What payment methods are accepted for SC16C550BIN40,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC16C550BIN40,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC16C550BIN40,112?
SC16C550BIN40,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC16C550BIN40,112 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 SC16C550BIN40,112?
For technical support, including SC16C550BIN40,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC16C550BIN40,112 requirements.
6.How does Aetrix verify that SC16C550BIN40,112 is sourced from the original manufacturer or authorized distributors?
All SC16C550BIN40,112 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 SC16C550BIN40,112 meets industry standards.
7.What is the process for return or replacement of SC16C550BIN40,112?
All SC16C550BIN40,112 units undergo pre-shipment inspection (PSI). If there is an issue with SC16C550BIN40,112, 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 SC16C550BIN40,112 part is unused and in its original packaging.
Return procedure for SC16C550BIN40,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SC16C550BIN40,112 Tags
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SC16IS741AIPWJ
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