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Texas Instruments NS16C2552TVAX/NOPB
- Part No.:
- NS16C2552TVAX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
NS16C2552TVAX/NOPB.pdf
- Description:
- IC UART DUAL 16BYTE 44-PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,737
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Product details
Overview
NS16C2552TVAX/NOPB from Texas Instruments is a dual-channel universal asynchronous receiver/transmitter (DUART) with independent 16-byte FIFOs per channel, 5 Mbit/s maximum data rate, 2.97–5.5 V supply operation, and industrial temperature range (–40°C to +85°C). It serves as a pin-compatible upgrade to PC16552D in legacy serial communication interfaces for embedded controllers and industrial gateways.
For engineers reviewing the NS16C2552TVAX/NOPB datasheet, NS16C2552TVAX/NOPB pinout, NS16C2552TVAX/NOPB application, or NS16C2552TVAX/NOPB equivalent, this device supports high-speed UART bridging with auto hardware/software flow control, IrDA v1.0 encoding/decoding, DMA-ready TXRDY/RXRDY signaling, and full MODEM control - critical for RS-232/422/485 interface consolidation in space-constrained designs.
Technical Context
The NS16C2552TVAX/NOPB implements two fully independent UART channels sharing only CPU bus interface and crystal input. Each channel features a dedicated 16-byte transmit/receive FIFO, programmable baud generator dividing input clock by 1–(2¹⁶−1), and full register compatibility with PC16552D at power-up.
It supports concurrent write access to internal registers across both channels, multi-function pins (MF1/MF2 configurable as OUT2/BAUDOUT/RXRDY), and enhanced interrupt prioritization via IIR with seven priority levels - enabling deterministic latency handling for real-time serial protocols.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | Up to 5 Mbit/s - enables high-throughput serial links without external clock multiplication. |
| FIFO Depth | 16 bytes per channel (Tx & Rx) - reduces CPU interrupt load and prevents overrun in burst-mode transfers. |
| Supply Voltage | 2.97 V to 5.50 V - supports direct interfacing with 3.3 V and 5 V logic systems without level shifters. |
| I/O Tolerance | 5 V tolerant inputs across full supply range - allows safe connection to legacy 5 V peripherals. |
| Temperature Range | –40°C to +85°C - qualified for industrial and extended-temperature embedded deployments. |
| Package | 48-pin TQFP (PFB0048A) - surface-mount compatible with automated PCB assembly and thermal management. |
| IrDA Support | IrDA v1.0 encoder/decoder integrated - enables wireless infrared communication without external PHY. |
Pinout & Package
NS16C2552TVAX/NOPB is housed in a 48-pin TQFP package (JEDEC MO-179AA, TI package code PFB0048A), with exposed thermal pad for improved heat dissipation in continuous serial traffic scenarios.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| D0–D7 | Parallel Data Bus | Tri-state bidirectional interface for register read/write; shares bus with CPU or microcontroller. |
| A0–A2 | Register Address Lines | Selects one of eight internal registers per channel (e.g., RBR, THR, LCR, MCR) during bus cycles. |
| CS | Chip Select | Active-low enable for register access; must stabilize before address/data setup per tAW timing. |
| CHSL | Channel Select | High = Channel 1; Low = Channel 2 - routes all address/data operations to selected UART core. |
| TXRDY1/TXRDY2 | Transmit Ready Output | Active-low DMA request signal indicating Tx FIFO empty or ready for next byte transfer. |
| RXRDY1/RXRDY2 | Receive Ready Output | Active-low DMA request triggered when Rx FIFO reaches programmed threshold or times out. |
| SIN1/SIN2 | Serial Input | Asynchronous receive data input; idle-high in UART mode, idle-low in IrDA mode. |
| SOUT1/SOUT2 | Serial Output | Asynchronous transmit data output; supports UART or IrDA modulation based on MCR[6]. |
| RTS1/RTS2, CTS1/CTS2 | Hardware Flow Control | Auto-RTS/CTS enabled via EFR; RTS asserts low when Tx FIFO has space, CTS deasserts low to pause Rx. |
| XIN/XOUT | Clock Oscillator Interface | Supports crystal (1–24 MHz) or external clock input; generates 16× baud clock internally. |
Key Features
| Feature | Design Value |
|---|---|
| Dual Independent UART Channels | Enables simultaneous RS-232 and RS-485 port expansion from single IC - eliminates need for two discrete UARTs. |
| Auto Hardware Flow Control (CTS/RTS) | Reduces firmware overhead by automatically managing handshaking based on FIFO fill level - prevents buffer overflow without CPU polling. |
| Auto Software Flow Control (XON/XOFF) | Configurable per-channel detection of XON/XOFF characters with interrupt generation - supports legacy terminal protocol compliance. |
| Programmable Baud Generator | Divides any input clock (1–24 MHz) by 1–65535 to generate precise 16× sampling clock - supports non-standard baud rates like 1.8432 Mbps or 3.6864 Mbps. |
| Multi-Function Pins (MF1/MF2) | Each pin configurable as OUT2 (general-purpose output), BAUDOUT (16× clock), or RXRDY - maximizes I/O utility in pin-limited designs. |
Applications
| Industrial Serial Gateway | Legacy System Retrofit |
|---|---|
Use Scenario: Connecting PLCs, HMIs, and sensors over RS-485 using isolated UART transceivers. IC Role / Device Role / Timing Role: Dual UART bridges MCU parallel bus to two independent serial physical layers with synchronized baud clocks. Use Value: 16-byte FIFOs absorb packet bursts from Modbus RTU slaves; 5 Mbit/s headroom supports future protocol upgrades. |
Use Scenario: Replacing obsolete PC16552D in aging medical diagnostic equipment requiring long-term component availability. IC Role / Device Role / Timing Role: Pin-to-pin drop-in replacement with identical register map and default initialization behavior. Use Value: Eliminates redesign risk while adding 5 V tolerant I/Os and lower voltage support (down to 2.97 V). |
| Embedded Wireless Terminal | Multi-Port Communication Controller |
Use Scenario: Integrating infrared keyboard and barcode scanner interfaces into handheld POS terminals. IC Role / Device Role / Timing Role: IrDA v1.0 encoder/decoder handles baseband modulation/demodulation for SIR (115.2 kbps) links. Use Value: Offloads IrDA timing-critical tasks from host processor; SIN/SOUT pins directly drive IR LED and photodiode circuits. |
Use Scenario: Managing four serial peripherals (GPS, GSM modem, debug console, sensor hub) via time-sliced UART arbitration. IC Role / Device Role / Timing Role: Dual-channel UART with prioritized interrupts and concurrent register writes enables deterministic scheduling. Use Value: Independent INTR1/INTR2 outputs allow separate NVIC vectoring in ARM Cortex-M systems - no software arbitration needed. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual UART applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| XR16C2552IL48-F | 64-byte FIFO per channel; higher pin count (48-pin LQFP); no IrDA support. | Better suited for high-throughput buffering in modem applications but lacks infrared capability. | Select XR16C2552IL48-F only if >16-byte FIFO depth is required and IrDA is unused. |
| SC16C2552BIB48 | Identical 16-byte FIFO and pinout; supports same 5 Mbit/s rate; requires external 5 V regulator for I/O tolerance. | Compatible for drop-in replacement where TI's integrated 5 V tolerance is not needed. | Choose SC16C2552BIB48 when sourcing from NXP-authorized channels and board layout already accommodates external level translation. |
Compared with XR16C2552IL48-F and SC16C2552BIB48, the NS16C2552TVAX/NOPB uniquely combines 5 V tolerant I/Os, IrDA v1.0 PHY, and PC16552D register compatibility in a single 48-TQFP package - making it optimal for cost-sensitive industrial retrofits requiring wireless serial extension.
Availability
NS16C2552TVAX/NOPB is available at Aetrix Electronics and suitable for industrial serial gateways, legacy system retrofits, embedded wireless terminals, and multi-port communication controllers requiring stable component supply and long-term lifecycle assurance.
Supply support for NS16C2552TVAX/NOPB 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 solutions for industrial, automotive, and communications markets.
The NS16C2552TVAX/NOPB belongs to TI's legacy UART product line, designed specifically for robust, pin-compatible upgrades of PC16552D-based systems while adding modern features like wider voltage range and IrDA support.
FAQ
What is the maximum data rate supported by the NS16C2552TVAX/NOPB?
The NS16C2552TVAX/NOPB supports up to 5 Mbit/s data transfer rate per channel. This is achieved using its programmable baud generator, which divides the input clock by values from 1 to 65,535 to produce precise 16× sampling clocks. The 5 Mbit/s limit applies under specified electrical conditions and is validated across the full industrial temperature range (–40°C to +85°C) with proper signal integrity design.
Does the NS16C2552TVAX/NOPB support IrDA communication?
Yes, the NS16C2552TVAX/NOPB integrates full IrDA v1.0 wireless infrared encoder/decoder functionality. When MCR[6] = 1, SOUT1/SOUT2 output IrDA-compliant pulse-width modulated signals, and SIN1/SIN2 accept demodulated IR input. Idle states differ between UART (SIN/SOUT high) and IrDA (SIN low, SOUT low), and external IR transceiver components remain necessary for optical transmission.
Is the NS16C2552TVAX/NOPB pin-compatible with the PC16552D?
Yes, the NS16C2552TVAX/NOPB is explicitly pin-to-pin compatible with TI's PC16552D. Its footprint, signal mapping, and default register configuration match the PC16552D at power-up, enabling direct replacement in existing designs. Key enhancements - including 5 V tolerant I/Os, wider supply range (2.97–5.5 V), and IrDA support - are added without altering mechanical or electrical interface requirements.
What FIFO depth does the NS16C2552TVAX/NOPB provide per channel?
The NS16C2552TVAX/NOPB provides 16 bytes of FIFO depth for both transmit and receive operations per channel. This is confirmed in the device description, feature list, and FCR register documentation. Unlike the NS16C2752 variant (64-byte FIFO), the NS16C2552TVAX/NOPB uses fixed 16-byte buffers - sufficient for most industrial serial protocols including Modbus RTU and ASCII command sets with moderate throughput demands.
How does auto hardware flow control work on the NS16C2552TVAX/NOPB?
Auto hardware flow control on the NS16C2552TVAX/NOPB operates per channel using RTS/CTS lines. When enabled via the Enhanced Feature Register (EFR), RTS1/RTS2 assert low automatically when the associated Tx FIFO has space, and CTS1/CTS2 deassert low to pause reception when the Rx FIFO nears capacity. Trigger levels are set via FCR[7:6], and status is reported in the MODEM Status Register (MSR) - eliminating software polling and reducing interrupt latency.
NS16C2552TVAX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 44-LCC (J-Lead)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Features:
- -
- Number of Channels:
- 2, DUART
- FIFO's:
- 16 Byte
- Protocol:
- -
- Data Rate (Max):
- 5Mbps
- Voltage - Supply:
- 2.97V ~ 5.5V
- With Auto Flow Control:
- Yes
- With IrDA Encoder/Decoder:
- Yes
- With False Start Bit Detection:
- -
- With Modem Control:
- Yes
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 44-PLCC (16.58x16.58)
NS16C2552TVAX/NOPB FAQ
1.How can I place an order for NS16C2552TVAX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for NS16C2552TVAX/NOPB 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 NS16C2552TVAX/NOPB reliable?
The price and inventory of NS16C2552TVAX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NS16C2552TVAX/NOPB is usually 5 days.
3.What payment methods are accepted for NS16C2552TVAX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NS16C2552TVAX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NS16C2552TVAX/NOPB?
NS16C2552TVAX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NS16C2552TVAX/NOPB 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 NS16C2552TVAX/NOPB?
For technical support, including NS16C2552TVAX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NS16C2552TVAX/NOPB requirements.
6.How does Aetrix verify that NS16C2552TVAX/NOPB is sourced from the original manufacturer or authorized distributors?
All NS16C2552TVAX/NOPB 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 NS16C2552TVAX/NOPB meets industry standards.
7.What is the process for return or replacement of NS16C2552TVAX/NOPB?
All NS16C2552TVAX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with NS16C2552TVAX/NOPB, 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 NS16C2552TVAX/NOPB part is unused and in its original packaging.
Return procedure for NS16C2552TVAX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
NS16C2552TVAX/NOPB Tags
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SC16IS741AIPWJ
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TL16C550CIPTR
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