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Texas Instruments TL16C2552IFNR
- Part No.:
- TL16C2552IFNR
- Manufacturer:
- Texas Instruments
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
TL16C2552IFNR.pdf
- Description:
- IC DUAL UART 16BYTE FIFO 44-PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,541
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Product details
Overview
TL16C2552IFNR from Texas Instruments is a dual universal asynchronous receiver/transmitter (UART) IC supporting 1.8-V to 5-V operation, featuring two independent 16-byte FIFOs per channel, programmable auto-RTS/CTS flow control, and up to 1.5-Mbaud serial data rate at 5 V. It serves as a drop-in upgrade to TL16C450 software and enables high-efficiency serial communication in embedded host interfaces.
For engineers reviewing the TL16C2552IFNR datasheet, TL16C2552IFNR pinout, TL16C2552IFNR application, or TL16C2552IFNR equivalent, key selection criteria include dual-channel FIFO depth, voltage-flexible clocking (10–24 MHz), hardware flow control timing behavior, register compatibility with legacy TL16C450 firmware, and PLCC-44 package footprint constraints.
Technical Context
The TL16C2552IFNR integrates two fully independent ACE (Asynchronous Communications Element) cores sharing only the parallel data bus and clock input. Each ACE implements a 16-byte transmit FIFO and 16-byte receive FIFO with three error status bits per byte, enabling efficient CPU offload in interrupt-driven or DMA-based serial systems.
Autoflow control-comprising auto-RTS and auto-CTS-is implemented via enhanced feature register (EFR) bit 6/7 and modem control register (MCR) bit 5, with RTS deassertion triggered at configurable RCV FIFO levels (1/4/8/14 bytes). The BAUDOUT pin provides a 16× internal clock for external synchronization, and multi-function pins (MFA/MFB) support OP, RXRDY, or BAUDOUT selection per channel.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.8 V to 5 V - supports mixed-voltage system integration without level shifters |
| Max Baud Rate | 1.5 Mbaud at 5 V (24-MHz clock) - enables high-speed point-of-sale or industrial telemetry links |
| FIFO Depth per Channel | 16-byte TX + 16-byte RX - reduces CPU interrupt load by ~8× vs. single-byte buffering |
| Register Compatibility | TL16C450 mode on reset - allows reuse of existing UART driver code without modification |
| Auto-Flow Control | Programmable RTS/CTS thresholds (1/4/8/14 bytes) - prevents receive FIFO overrun without software polling |
| Interrupt Architecture | Fully prioritized per-channel interrupts (TX, RX, line status, modem) - enables deterministic real-time response |
| Crystal/External Clock Input | XTAL1 accepts 10–24 MHz crystal or buffered clock - supports precise baud generation across voltage grades |
Pinout & Package
TL16C2552IFNR is packaged in a 44-pin PLCC (FN) with lead-free finish and industrial temperature range (–40°C to 85°C). Pin functions are validated per TI SLWS163A datasheet Rev. June 2006.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A2 | Address select inputs | Select internal register address (0–7) for CPU read/write access to either UART channel |
| CHSEL | Channel select input | Determines whether CS accesses UART-A (CHSEL = 1) or UART-B (CHSEL = 0); overrideable via AFR bit 0 |
| CS | Chip select (active low) | Enables data bus interface only when asserted with correct CHSEL state |
| IOR / IOW | Read/write strobes (active low) | Control timing of register access; require setup/hold times per timing table (e.g., tIOR min = 40 ns @ 5 V) |
| INTA / INTB | Independent interrupt outputs | Active-high, open-drain capable; each signals pending events (RX ready, TX empty, errors) for its respective UART |
| RTSA / RTSB | Request-to-send outputs | Active-low; controlled by MCR bit 1 or auto-RTS logic; deasserted when RCV FIFO reaches programmed trigger level |
| CTSA / CTSB | Clear-to-send inputs | Active-low; gate transmitter output when auto-CTS enabled; must be asserted before stop-bit midpoint to prevent overrun |
| RXA / RXB | Serial receive inputs | Accept TTL-level asynchronous serial data; support local loopback mode where RX is internally tied to TX |
| TXA / TXB | Serial transmit outputs | Drive TTL-level serial data; output impedance and drive strength vary with VCC (e.g., IOL = 4 mA @ 5 V) |
| MFA / MFB | Multi-function outputs | Configurable per channel: OP (MCR bit 3 status), BAUDOUT (16× clock), or RXRDY (DMA-ready signal) |
| RESET | Asynchronous reset input | Active-high; resets all registers to TL16C450-compatible state and disables TX/RX paths during assertion |
| XTAL1 / XTAL2 | Clock oscillator terminals | Support crystal (1–24 MHz) or external clock input; XTAL2 is buffered output used for feedback or monitoring |
Key Features
| Feature | Design Value |
|---|---|
| Independent dual UART channels | Each with dedicated 16-byte FIFOs, registers, and interrupt lines - eliminates inter-channel timing contention in multi-peripheral systems |
| Programmable autoflow control | Hardware-managed RTS/CTS handshaking with four selectable RCV FIFO trigger levels - removes software polling overhead and guarantees no receive overruns |
| Multi-function output pins (MFA/MFB) | Runtime-selectable BAUDOUT, RXRDY, or OP function per channel - saves PCB space and simplifies DMA or clock-synchronization designs |
| Backward-compatible TL16C450 mode | Power-on reset initializes registers to TL16C450 map - enables drop-in replacement in legacy systems without driver changes |
| Voltage-flexible operation | Single device supports 1.8 V, 2.5 V, 3.3 V, and 5 V supply rails - simplifies migration across generations of host processors and power domains |
| Complete modem control interface | DTR/DSR/RI/DCD/CTS/RTS signals per channel with status reporting in MSR - enables direct RJ11 cable connection without external transceivers |
Applications
| Point-of-Sale Terminal | Gaming Terminal |
|---|---|
Use Scenario: Serial communication between main controller and receipt printer, barcode scanner, and magnetic stripe reader. IC Role / Device Role / Timing Role: Dual UART handles concurrent bidirectional streams with hardware flow control to prevent buffer overflow during burst transfers. Use Value: 16-byte FIFOs reduce interrupt frequency by >80% vs. legacy UARTs, improving CPU availability for UI rendering and transaction processing. |
Use Scenario: Interfacing game engine board with coin acceptor, bill validator, and LED display controller via RS-232/RS-485 adapters. IC Role / Device Role / Timing Role: Provides isolated serial ports with auto-RTS/CTS to manage variable-latency peripheral responses without software stalls. Use Value: TL16C450 register compatibility allows reuse of certified gaming firmware drivers, accelerating regulatory certification cycles. |
| Industrial Router Control | Factory Automation PLC |
Use Scenario: Management port for configuration and diagnostics in edge routers with multiple WAN/LAN modules. IC Role / Device Role / Timing Role: Dual-channel UART routes console commands and debug logs simultaneously while maintaining strict baud accuracy via crystal input. Use Value: BAUDOUT pin provides synchronized 16× clock to external logic analyzers, enabling precise timing validation of serial protocol compliance. |
Use Scenario: Connecting HMI panel and sensor network gateways to programmable logic controller (PLC) backplane. IC Role / Device Role / Timing Role: Acts as serial bridge between 3.3-V microcontroller and legacy 5-V RS-232 peripherals using voltage-tolerant I/O. Use Value: Independent INTA/INTB lines allow real-time prioritization of safety-critical sensor alerts over non-urgent HMI updates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual UART applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL16C2550IFN | No FIFOs; single-character buffering only - requires higher CPU interrupt rate and precise timing coordination. | Suitable only for low-bandwidth, low-latency control links where software overhead is acceptable. | Choose only if cost sensitivity outweighs throughput and interrupt load requirements. |
| SC16IS752IPW | I²C/SPI interface instead of parallel bus; integrated crystal oscillator; smaller 28-pin TSSOP package. | Better suited for space-constrained, low-pin-count MCU designs lacking parallel bus, but requires firmware rewrite for serial interface handling. | Select when migrating from parallel to serial host interface and board area is critical. |
Compared with TL16C2552IFNR, TL16C2550IFN lacks FIFOs and flow control - increasing software burden and limiting reliable baud rates - while SC16IS752IPW replaces the parallel bus with SPI/I²C, trading pin count and integration for driver complexity and loss of TL16C450 compatibility.
Availability
TL16C2552IFNR is available at Aetrix Electronics and suitable for point-of-sale terminals, industrial routers, factory automation PLCs, and gaming terminals requiring stable component supply across extended product lifecycles.
Supply support for TL16C2552IFNR 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies with over 50 years of innovation in industrial and communications ICs.
The TL16C2552IFNR belongs to TI's legacy UART product line designed for robust, software-compatible serial interface expansion in industrial control, networking, and embedded computing systems.
FAQ
What is the operating temperature range for TL16C2552IFNR?
The TL16C2552IFNR is rated for industrial operation from –40°C to +85°C, matching the "I" grade suffix in its part number. This range ensures reliable performance in factory automation, outdoor kiosks, and network infrastructure equipment where ambient temperatures exceed commercial limits. All electrical specifications in the datasheet are guaranteed across this full range.
Does TL16C2552IFNR support automatic hardware flow control?
Yes, TL16C2552IFNR supports programmable auto-RTS and auto-CTS via the Enhanced Feature Register (EFR) and Modem Control Register (MCR). When enabled, RTS deasserts when the receive FIFO reaches a user-selected threshold (1/4/8/14 bytes), and CTS gates transmission - eliminating receive overruns without CPU intervention. This behavior is validated in Figures 2–5 of the SLWS163A datasheet.
Can TL16C2552IFNR be used as a direct replacement for TL16C450-based designs?
Yes, TL16C2552IFNR powers up in TL16C450-compatible mode: all registers default to identical addresses and bit definitions, and it accepts the same software initialization sequence. No driver modifications are needed to achieve basic functionality. FIFO and enhanced features require explicit enablement via EFR writes, preserving backward compatibility while allowing incremental upgrades.
What package type does TL16C2552IFNR use, and is it RoHS-compliant?
TL16C2552IFNR uses a 44-pin plastic leaded chip carrier (PLCC-FN) package with gull-wing leads and lead-free (Pb-free) finish, compliant with RoHS Directive 2011/65/EU. The FN package is explicitly listed in the device marking and ordering information section of the SLWS163A datasheet, and TI confirms full environmental compliance for this variant.
How does the multi-function pin (MFA/MFB) operate on TL16C2552IFNR?
Each MFA (Channel A) and MFB (Channel B) pin on TL16C2552IFNR can be configured via bits 1–2 of the Alternate Function Register (AFR) to output one of three signals: OP (MCR bit 3 status), BAUDOUT (16× internal clock), or RXRDY (active-low receive-ready flag for DMA). Configuration is per-channel and persists until rewritten, enabling flexible system-level timing and control routing without external logic.
TL16C2552IFNR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 44-LCC (J-Lead)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Features:
- Internal Oscillator
- Number of Channels:
- 2, DUART
- FIFO's:
- 16 Byte
- Protocol:
- -
- Data Rate (Max):
- 1.5Mbps
- Voltage - Supply:
- 1.8V ~ 5V
- With Auto Flow Control:
- Yes
- With IrDA Encoder/Decoder:
- -
- With False Start Bit Detection:
- Yes
- With Modem Control:
- Yes
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 44-PLCC (16.58x16.58)
TL16C2552IFNR FAQ
1.How can I place an order for TL16C2552IFNR through Aetrix?
Please submit a Request for Quotation (RFQ) for TL16C2552IFNR 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 TL16C2552IFNR reliable?
The price and inventory of TL16C2552IFNR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL16C2552IFNR is usually 5 days.
3.What payment methods are accepted for TL16C2552IFNR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL16C2552IFNR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL16C2552IFNR?
TL16C2552IFNR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL16C2552IFNR 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 TL16C2552IFNR?
For technical support, including TL16C2552IFNR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL16C2552IFNR requirements.
6.How does Aetrix verify that TL16C2552IFNR is sourced from the original manufacturer or authorized distributors?
All TL16C2552IFNR 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 TL16C2552IFNR meets industry standards.
7.What is the process for return or replacement of TL16C2552IFNR?
All TL16C2552IFNR units undergo pre-shipment inspection (PSI). If there is an issue with TL16C2552IFNR, 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 TL16C2552IFNR part is unused and in its original packaging.
Return procedure for TL16C2552IFNR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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