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Texas Instruments TL16C2550RHBG4
- Part No.:
- TL16C2550RHBG4
- Manufacturer:
- Texas Instruments
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
TL16C2550RHBG4.pdf
- Description:
- IC DUAL UART 16BYTE FIFO 32-VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,734
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Product details
Overview
TL16C2550RHBG4 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 peripheral connectivity with hardware handshaking.
For engineers reviewing the TL16C2550RHBG4 datasheet, TL16C2550RHBG4 pinout, TL16C2550RHBG4 application, or TL16C2550RHBG4 equivalent, this page delivers verified electrical specs, RHB package terminal mapping, UART channel independence, FIFO trigger-level control, and real-world industrial communication use cases - all confirmed against TI's SLWS161E datasheet.
Technical Context
The TL16C2550RHBG4 integrates two fully independent ACE (Asynchronous Communications Element) cores sharing only the parallel data bus and clock source. Each ACE implements a 16× baud-rate generator with divisor range 1–65535, full modem control (CTS/RTS/DTR/DSR/RI/CD), and status reporting for break, parity, framing, and overrun errors.
It operates in TL16C450-compatible mode on reset and supports FIFO mode with selectable trigger levels (1/4/8/14 bytes) and autoflow control enabled via EFR bits 6–7. The RHB package omits DSRA/DSRB, RIA/RIB, CDA/CDB, OPA/OPB, RXRDYA/RXRDYB, TXRDYA/TXRDYB, DTRA/DTRB - reducing pin count while retaining core UART functionality.
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 like cellular data modems |
| FIFO Depth | 16-byte Tx/Rx per channel - reduces CPU interrupt load by ~90% vs. single-byte buffering |
| Auto-Flow Control | Programmable auto-RTS/auto-CTS per channel - eliminates receive FIFO overruns without software polling |
| Interrupt Architecture | Fully prioritized per-channel interrupts (INTA/INTB) - allows independent handling of UART A/B events |
| Package | 32-pin QFN (RHB) - 5 mm × 5 mm footprint with exposed thermal pad for industrial temperature operation |
| Operating Temperature | –40°C to +85°C - qualified for automotive and factory automation environments |
Pinout & Package
The TL16C2550RHBG4 uses a 32-pin QFN (RHB) package with 0.5-mm pitch, exposed thermal pad, and no leaded pins. This RoHS-compliant package supports reflow soldering and provides thermal performance suitable for continuous 20-MHz operation at 3.3 V.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RESET | Active-high global reset input | Clears all registers and disables TX/RX outputs; required for deterministic initialization |
| A0–A2 | Address select inputs | Select internal register address (0–7) for CPU read/write access to UART A or B |
| CSA / CSB | Channel-select chip enable (active low) | Enable data transfers to UART A or B independently; supports shared bus arbitration |
| IOR / IOW | Read/write strobes (active low) | Control timing of register access; compatible with standard 8080-style microprocessor buses |
| D0–D7 | Bidirectional 8-bit data bus | Transfers register contents and status data; 3-state drive supports multi-device bus sharing |
| TXA / TXB | Serial transmit outputs | Asynchronous NRZ output per channel; require external line drivers for RS-232/RS-485 |
| RXA / RXB | Serial receive inputs | Accept TTL-level serial input; support local loopback mode for diagnostics |
| INTA / INTB | Active-high interrupt outputs | Assert on Rx data ready, Tx empty, line error, or modem status change per channel |
| RTSA / RTSB | Hardware flow control outputs | Driven low automatically when Rx FIFO reaches programmed trigger level (auto-RTS) |
| CTSA / CTSB | Hardware flow control inputs | Gate Tx FIFO output when low; enable auto-CTS to prevent transmit overruns |
| XTAL1 / XTAL2 | Clock oscillator terminals | Support crystal (1–24 MHz) or external clock input; determine maximum baud rate capability |
| VCC / GND | Power supply pins | Single-supply operation; decoupling capacitor required at VCC pin per datasheet layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent UART channels | Enables simultaneous serial communication with two peripherals (e.g., GPS + modem) without CPU time-slicing |
| 16-byte FIFO per channel | Reduces interrupt frequency from ~115 kHz (1-Mbaud, 1-byte) to ~7.2 kHz - freeing CPU cycles for application logic |
| Programmable baud rate generator | Divides input clock by 1–65535 to generate precise 16× sampling clock - supports non-standard legacy protocols |
| False-start bit detection | Identifies spurious leading edges before valid start bit - improves noise immunity in electrically noisy factory settings |
| Complete status reporting | Separate line status (LSR), modem status (MSR), and FIFO control (FCR) registers - enable robust error recovery |
| TL16C450 software compatibility | Registers identical on power-up - allows drop-in replacement in legacy designs without firmware changes |
Applications
| Point-of-Sale Terminal | Gaming Terminal |
|---|---|
Use Scenario: Connecting receipt printer, barcode scanner, and cash drawer via separate serial ports under Linux-based ARM host. IC Role / Device Role / Timing Role: Dual UART bridges CPU parallel bus to three asynchronous peripherals; each channel handles independent baud rates (9600 bps printer, 115200 bps scanner). Use Value: Eliminates need for two discrete UARTs or software bit-banging; 16-byte FIFOs prevent data loss during kernel context switches. | Use Scenario: Real-time communication between game engine MCU and external payment module and LED status board. IC Role / Device Role / Timing Role: TL16C2550RHBG4 acts as dedicated serial coprocessor - offloading UART state machine and interrupt management from main game CPU. Use Value: Auto-RTS/CTS prevents buffer overflow during bursty credit card authorization packets; 32-pin QFN saves PCB area in space-constrained kiosk design. |
| Factory Automation Controller | Cellular Data Module Interface |
Use Scenario: PLC mainboard interfacing with legacy RS-232 sensors (temperature, pressure) and HMI display over isolated serial links. IC Role / Device Role / Timing Role: Provides two isolated UART channels with hardware flow control - one for sensor polling, one for HMI command/response. Use Value: Programmable FIFO trigger levels adapt to variable sensor response latency; 1.8-V support enables direct connection to low-power microcontrollers. | Use Scenario: Host processor in portable hotspot device communicating with 3G/LTE modem and GPS receiver simultaneously. IC Role / Device Role / Timing Role: TL16C2550RHBG4 manages AT command flow to modem (UART A) and NMEA stream from GPS (UART B) with independent interrupt lines. Use Value: Independent INTA/INTB allow priority-based ISR handling; 1.5-Mbaud capability supports LTE control channel throughput requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual UART applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL16C752BRHB | Pin-compatible 32-pin QFN; adds infrared (IrDA) encoder/decoder and enhanced FIFO control registers | Required for IrDA-compliant remote control or medical telemetry interfaces | Select TL16C752BRHB only if IrDA physical layer support is needed; otherwise TL16C2550RHBG4 offers lower cost and identical UART functionality |
| SC16IS752IPW | I²C/SPI interface instead of parallel bus; integrated crystal oscillator; smaller 24-pin TSSOP package | Suitable for microcontrollers lacking parallel bus but with I²C/SPI peripherals | Choose SC16IS752IPW for space-constrained, low-pin-count designs with I²C master; TL16C2550RHBG4 remains optimal for 8080/ISA-style bus architectures |
Compared with TL16C752BRHB and SC16IS752IPW, the TL16C2550RHBG4 delivers native parallel-bus compatibility, broader voltage range (1.8–5 V), and proven industrial temperature reliability - making it the preferred choice for legacy embedded systems and FPGA-based controllers requiring minimal interface redesign.
Availability
TL16C2550RHBG4 is available at Aetrix Electronics and suitable for factory automation controllers, point-of-sale terminals, and cellular data modules requiring stable component supply across extended product lifecycles.
Supply support for TL16C2550RHBG4 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 U.S.-based semiconductor company specializing in analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.
The TL16C2550RHBG4 belongs to TI's legacy UART product line, designed specifically for reliable, low-overhead serial communication in resource-constrained embedded systems with parallel bus interfaces.
FAQ
What is the maximum clock frequency supported by TL16C2550RHBG4 at 3.3-V operation?
The TL16C2550RHBG4 supports up to a 20-MHz input clock at 3.3-V operation, enabling a maximum serial data rate of 1.25 Mbaud. This is specified in the Recommended Operating Conditions table of TI's SLWS161E datasheet and validated across the full –40°C to +85°C temperature range. The 20-MHz limit ensures stable internal logic timing and FIFO synchronization without timing violations.
Does TL16C2550RHBG4 support automatic hardware flow control on both UART channels simultaneously?
Yes, TL16C2550RHBG4 supports independent auto-RTS and auto-CTS on both UART A and UART B channels. Each channel's flow control is enabled separately via its Enhanced Feature Register (EFR), allowing concurrent operation - for example, UART A using auto-RTS for a sensor and UART B using auto-CTS for a modem. The RHB package retains CTSA/CTSB and RTSA/RTSB pins required for this functionality.
How does the TL16C2550RHBG4 handle false-start bit detection, and why is it important in industrial environments?
The TL16C2550RHBG4 performs false-start bit detection by validating the duration of the leading low state before sampling the start bit. If the low pulse is shorter than a valid start bit width, it is rejected - preventing misframing due to EMI-induced glitches on long RS-232 cables in factory settings. This feature is enabled by default and requires no configuration, directly improving communication robustness without CPU overhead.
Can TL16C2550RHBG4 operate from a 1.8-V supply while maintaining full 1.5-Mbaud capability?
No. At 1.8-V operation, TL16C2550RHBG4 supports up to 625-kbaud (10-MHz clock), not 1.5-Mbaud. The 1.5-Mbaud rating requires 5-V supply and 24-MHz clock, as stated in the Features section and confirmed in the Recommended Operating Conditions table. Attempting 24-MHz clock at 1.8 V violates absolute maximum ratings and will cause functional failure.
What are the key pin differences between TL16C2550RHBG4 and the 48-pin PFB package variant?
The TL16C2550RHBG4 (32-pin QFN) omits DSRA/DSRB, RIA/RIB, CDA/CDB, OPA/OPB, RXRDYA/RXRDYB, TXRDYA/TXRDYB, and DTRA/DTRB versus the PFB variant. These removed signals reduce pin count but retain full UART functionality - including RTS/CTS flow control, interrupt outputs, and data transfer - making the RHB ideal for cost- and space-sensitive designs where modem status monitoring is not required.
TL16C2550RHBG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 32-VFQFN Exposed Pad
- Series:
- -
- Packaging:
- Tray
- Product Status:
- Discontinued at Digi-Key
- 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:
- 32-VQFN (5x5)
TL16C2550RHBG4 FAQ
1.How can I place an order for TL16C2550RHBG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL16C2550RHBG4 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 TL16C2550RHBG4 reliable?
The price and inventory of TL16C2550RHBG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL16C2550RHBG4 is usually 5 days.
3.What payment methods are accepted for TL16C2550RHBG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL16C2550RHBG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL16C2550RHBG4?
TL16C2550RHBG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL16C2550RHBG4 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 TL16C2550RHBG4?
For technical support, including TL16C2550RHBG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL16C2550RHBG4 requirements.
6.How does Aetrix verify that TL16C2550RHBG4 is sourced from the original manufacturer or authorized distributors?
All TL16C2550RHBG4 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 TL16C2550RHBG4 meets industry standards.
7.What is the process for return or replacement of TL16C2550RHBG4?
All TL16C2550RHBG4 units undergo pre-shipment inspection (PSI). If there is an issue with TL16C2550RHBG4, 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 TL16C2550RHBG4 part is unused and in its original packaging.
Return procedure for TL16C2550RHBG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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