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Texas Instruments TL16C2550PFB
- Part No.:
- TL16C2550PFB
- Manufacturer:
- Texas Instruments
- Package:
- 48-TQFP
- Datasheet:
-
TL16C2550PFB.pdf
- Description:
- IC DUAL UART 1.8-5V FIFO 48-TQFP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
TL16C2550PFB from Texas Instruments is a dual universal asynchronous receiver/transmitter (UART) IC with independent 16-byte transmit and receive FIFOs per channel, supporting 1.8-V to 5-V operation, up to 1.5-Mbaud at 5 V, and programmable auto-RTS/auto-CTS flow control. It serves as a serial interface bridge in embedded host systems requiring dual-channel RS-232/RS-485 modem or peripheral connectivity.
For engineers reviewing the TL16C2550PFB datasheet, TL16C2550PFB pinout, TL16C2550PFB application, or TL16C2550PFB equivalent, key selection criteria include voltage scalability across 1.8–5 V rails, hardware flow control timing compatibility with legacy TL16C450 software, and TQFP-48 package integration into space-constrained industrial control and point-of-sale designs.
Technical Context
The TL16C2550PFB integrates two fully independent ACE (Asynchronous Communications Element) channels-each with its own register set, 16-byte TX/RX FIFOs, and baud rate generator-sharing only the parallel data bus and clock source. Each channel supports full modem control (CTS/RTS/DSR/DTR/RI/CD), false-start bit detection, and line-break generation/detection.
Its dual-channel architecture enables simultaneous serial communication with separate interrupt lines (INTA/INTB), independent receiver clock inputs, and configurable FIFO trigger levels (1/4/8/14 bytes). The device operates in TL16C450-compatible mode on reset and transitions to enhanced FIFO mode via the Enhanced Feature Register (EFR), reducing CPU overhead in high-throughput applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.8 V to 5 V - Enables direct integration into mixed-voltage systems without level shifters. |
| Max Baud Rate | 1.5 Mbaud at 5 V (24-MHz clock) - Supports high-speed serial links for cellular data and router control. |
| FIFO Depth | 16-byte TX + 16-byte RX per channel - Reduces interrupt frequency by >8× vs. single-byte buffers. |
| Auto Flow Control | Programmable auto-RTS/auto-CTS per channel - Eliminates receive FIFO overruns without CPU intervention. |
| Interrupt Architecture | Fully prioritized INTA/INTB with independent enable/control - Allows real-time handling of UART A/B events without masking. |
| Package | 48-pin TQFP (PFB) - Standard surface-mount footprint compatible with automated PCB assembly. |
| Reset Behavior | Registers match TL16C450 on power-up - Ensures drop-in software compatibility with legacy drivers. |
Pinout & Package
TL16C2550PFB uses a 48-pin Thin Quad Flat Package (TQFP) with 0.5-mm pitch, thermally enhanced for industrial ambient operation. Pin functions are validated per TI SLWS161E Rev. November 2012.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A2 | Address select inputs | Select internal register address (0–7) for CPU read/write access to UART A or B registers. |
| CSA / CSB | Channel-select chip enables | Enable data transfers to UART A or B independently; support shared bus arbitration. |
| IOR / IOW | Read/write strobes | Control timing of register reads/writes; compatible with standard 8080-style bus protocols. |
| TXA / TXB | Transmit data outputs | Serial output signals for each UART channel; drive external line drivers (e.g., MAX232). |
| RXA / RXB | Receive data inputs | Differential or single-ended serial input; support local loopback for diagnostics. |
| RTSA / RTSB | Request-to-send outputs | Hardware flow control outputs; deasserted when RX FIFO reaches programmed trigger level. |
| CTSA / CTSB | Clear-to-send inputs | Hardware flow control inputs; gate transmission until asserted, preventing TX FIFO underflow. |
| INTA / INTB | Interrupt request outputs | Active-high, open-drain capable interrupts; indicate RX/TX/status events per channel. |
| RESET | Global reset input | Active-high signal that clears all registers and disables TX/RX outputs during initialization. |
| XTAL1 / XTAL2 | Clock oscillator terminals | Support crystal (1–24 MHz) or external clock input; generate internal 16× baud clock. |
Key Features
| Feature | Design Value |
|---|---|
| Independent dual UART channels | Enables concurrent serial communication with separate configuration, interrupts, and FIFO management-no resource contention. |
| 16-byte FIFOs with error status bits | Each RX byte includes 3 status bits (parity/framing/overrun); eliminates polling and reduces CPU load by >90% vs. 1-byte buffers. |
| Programmable baud rate generator | Divides input clock by 1–65535 to generate precise 16× internal clock-supports custom rates from DC to 1.5 Mbaud. |
| Auto-RTS and Auto-CTS per channel | Hardware-managed flow control prevents FIFO overflow/underflow without software polling or timer-based handshaking. |
| TL16C450 register compatibility | Power-on reset configures registers identically to TL16C450-enables reuse of existing driver stacks and BIOS code. |
Applications
| Point-of-Sale Terminals | Gaming Terminals |
|---|---|
Use Scenario: Connecting receipt printers, barcode scanners, and magnetic stripe readers via RS-232 interfaces. IC Role / Device Role / Timing Role: Dual UART bridges host processor to multiple peripherals using independent TX/RX FIFOs and hardware flow control. Use Value: Prevents data loss during burst printing or rapid scan sequences by eliminating RX FIFO overruns through auto-CTS. | Use Scenario: Managing serial communication between main CPU and coin acceptors, bill validators, and display controllers. IC Role / Device Role / Timing Role: Provides isolated, low-latency serial paths with dedicated INTA/INTB for real-time event response. Use Value: Reduces interrupt servicing overhead by 85% via 16-byte FIFO buffering-critical for deterministic game-state updates. |
| Router Control | Factory Automation |
Use Scenario: Enabling CLI access, firmware updates, and diagnostic logging over console ports in network edge devices. IC Role / Device Role / Timing Role: Acts as system console UART with robust line-break detection and framing error reporting. Use Value: Ensures reliable command-line session integrity during power cycling or noisy EMI environments via false-start bit detection. | Use Scenario: Interfacing PLCs, HMIs, and motor drives using RS-485 multidrop networks with hardware flow control. IC Role / Device Role / Timing Role: Serves as protocol-transparent serial transceiver with independent clocking per channel for multi-protocol support. Use Value: Supports simultaneous Modbus RTU (Channel A) and ASCII-based sensor telemetry (Channel B) without CPU scheduling conflicts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual UART applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL16C752BPFB | Pin-compatible 48-pin TQFP; identical register map and FIFO depth but lacks 1.8-V support and has reduced max clock (20 MHz @ 3.3 V). | Not suitable for ultra-low-voltage battery-powered portable applications requiring 1.8-V operation. | Choose TL16C752BPFB only if 1.8-V operation is unnecessary and cost is primary concern. |
| SC16IS752IPW | I²C/SPI interface instead of parallel bus; integrated crystal oscillator; smaller 28-pin TSSOP package; supports IRQ sharing. | Requires firmware rewrite for serial interface protocol; eliminates need for address decoding logic but adds I²C timing constraints. | Prefer SC16IS752IPW for new designs with limited PCB space and existing I²C infrastructure. |
Compared with TL16C752BPFB and SC16IS752IPW, TL16C2550PFB uniquely supports 1.8–5-V operation with parallel bus timing compatibility to legacy x86/ARM systems, making it optimal for industrial retrofits and mixed-voltage embedded platforms where software reuse and voltage flexibility are critical.
Availability
TL16C2550PFB is available at Aetrix Electronics and suitable for point-of-sale terminals, gaming hardware, and factory automation systems requiring stable component supply, long-term lifecycle assurance, and industrial-grade temperature range (-40°C to 85°C) operation.
Supply support for TL16C2550PFB 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 TL16C2550 product line delivers dual-channel UART functionality optimized for industrial control, networking equipment, and legacy interface bridging-designed to extend the life of parallel-bus-based systems while enabling modern voltage scalability.
FAQ
What voltage ranges does the TL16C2550PFB support, and how does this affect system design?
The TL16C2550PFB supports 1.8 V, 2.5 V, 3.3 V, and 5 V supply rails with corresponding maximum clock rates (10 MHz to 24 MHz). This allows direct integration into mixed-voltage systems-such as an ARM processor running at 3.3 V interfacing with 5-V legacy peripherals-without external level shifters, simplifying PCB layout and reducing BOM cost. Each voltage grade has validated electrical characteristics per TI SLWS161E.
How does the TL16C2550PFB's auto-RTS/auto-CTS implementation prevent FIFO overrun?
The TL16C2550PFB implements hardware-managed auto-RTS/auto-CTS per channel: RTS deasserts when the RX FIFO reaches a user-programmed trigger level (1/4/8/14 bytes), and CTS must be asserted before the transmitter emits the next byte. This closed-loop handshake eliminates software polling and guarantees no data loss-even during sustained 1.5-Mbaud traffic-by synchronizing transmit readiness with actual buffer availability.
Is the TL16C2550PFB pin-compatible with older UARTs, and what software changes are needed?
Yes-the TL16C2550PFB is pin-compatible with TL16C752B in the PFB package and resets to TL16C450 register compatibility. No hardware changes are required. Software requires only minor updates to enable FIFO mode (via FCR) and enhanced features (EFR), while existing TL16C450 drivers remain functional for basic operation.
What are the key timing parameters for interfacing the TL16C2550PFB with an 8080-style microprocessor bus?
Key timing parameters include IOR/IOW pulse widths (min 12 ns at 5 V), address setup/hold times (tAW/tWA = 7–10 ns), and data valid windows (tDS/tDH = 11–15 ns). These are specified in TI SLWS161E Table 5 and ensure reliable register access at up to 24-MHz clock rates. External glue logic is unnecessary for most 8-bit and 16-bit CPUs meeting these timing margins.
Does the TL16C2550PFB support crystal oscillators, and what frequency ranges are validated?
Yes-XTAL1 and XTAL2 support fundamental-mode crystals from 1 MHz to 24 MHz, with full characterization at 10 MHz (1.8 V), 16 MHz (2.5 V), 20 MHz (3.3 V), and 24 MHz (5 V). The internal oscillator meets stability and startup time specs per TI SLWS161E Section 6.3, enabling precise baud rate generation without external clock sources.
TL16C2550PFB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 48-TQFP
- Series:
- -
- Packaging:
- Tray
- 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:
- 48-TQFP (7x7)
TL16C2550PFB FAQ
1.How can I place an order for TL16C2550PFB through Aetrix?
Please submit a Request for Quotation (RFQ) for TL16C2550PFB 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 TL16C2550PFB reliable?
The price and inventory of TL16C2550PFB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL16C2550PFB is usually 5 days.
3.What payment methods are accepted for TL16C2550PFB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL16C2550PFB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL16C2550PFB?
TL16C2550PFB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL16C2550PFB 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 TL16C2550PFB?
For technical support, including TL16C2550PFB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL16C2550PFB requirements.
6.How does Aetrix verify that TL16C2550PFB is sourced from the original manufacturer or authorized distributors?
All TL16C2550PFB 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 TL16C2550PFB meets industry standards.
7.What is the process for return or replacement of TL16C2550PFB?
All TL16C2550PFB units undergo pre-shipment inspection (PSI). If there is an issue with TL16C2550PFB, 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 TL16C2550PFB part is unused and in its original packaging.
Return procedure for TL16C2550PFB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL16C2550PFB Tags
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