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NXP Semiconductors SC16C554DIA68,529
- Part No.:
- SC16C554DIA68,529
- Manufacturer:
- NXP Semiconductors
- Package:
- 68-LCC (J-Lead)
- Datasheet:
-
SC16C554DIA68,529.pdf
- Description:
- IC UART QUAD 68PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,635
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Product details
Overview
SC16C554DIA68 from NXP Semiconductors (formerly Philips) is a quad UART IC with 16-byte transmit/receive FIFOs, IrDA infrared encoder/decoder, and dual-mode (Intel 16/ Motorola 68) bus interface. It supports up to 5 Mbit/s serial data rates at 5 V/3.3 V, operates across industrial temperature range (−40 °C to +85 °C), and delivers hardware/software flow control for multi-channel embedded communications in industrial gateways and legacy serial server designs.
For engineers reviewing the SC16C554DIA68 datasheet, SC16C554DIA68 pinout, SC16C554DIA68 application, or SC16C554DIA68 equivalent, key selection criteria include PLCC68 package compatibility, 16/68 interface mode select (pin 31), FIFO trigger level programmability, IrDA support, and pin-for-pin equivalence with ST16C554 and TL16C554 in 16-mode operation.
Technical Context
The SC16C554DIA68 integrates four independent UART channels sharing a common 8-bit bidirectional data bus (D0–D7), with separate modem control (RTS/CTS/DSR/DTR/RI/CD) and interrupt signaling per channel. Its dual-bus architecture supports both Intel-style (IOR/IOW/CSA–CSD/INTA–INTD) and Motorola-style (R/W/CS/A0–A4/IRQ) addressing via the 16/68 mode select pin (pin 31).
Internally, it implements a programmable baud rate generator (DLL/DLM registers), enhanced feature register (EFR) for auto-flow control, and dedicated IR encoder/decoder logic compliant with IrDA 1.0 physical layer. FIFO status is reported via wire-OR'd TXRDY/RXRDY outputs, while individual channel status is accessible through address-mapped internal registers using A0–A2 (16-mode) or CS+A3+A4 (68-mode).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 4 independent asynchronous serial ports (A–D) with full modem control signals |
| Max Data Rate | 5 Mbit/s at 5 V or 3.3 V; 3 Mbit/s at 2.5 V - enables high-speed modem and networking interfaces |
| FIFO Depth | 16-byte TX and RX FIFO per channel - reduces CPU interrupt load and improves throughput in bursty traffic |
| Interface Mode | Selectable 16-bit (Intel) or 68-bit (Motorola) bus interface via pin 31 - ensures compatibility with diverse host processors |
| Supply Voltage | 2.5 V / 3.3 V / 5 V operation - supports mixed-voltage system integration and legacy board upgrades |
| IrDA Support | Integrated IrDA 1.0 encoder/decoder - eliminates external transceiver for infrared serial links |
| Operating Temp | −40 °C to +85 °C industrial grade - suitable for uncontrolled environments like factory automation and telecom infrastructure |
Pinout & Package
SC16C554DIA68 is housed in a plastic leaded chip carrier (PLCC68) package (SOT188-2), 24.2 mm × 24.2 mm × 4.2 mm, with J-lead terminations and 68 pins. Pin 31 (16/68) configures bus interface mode; pins 16, 20, 50, 54 serve as individual chip selects (CSA–CSD) in 16-mode; pins 15, 21, 49, 55 provide per-channel interrupts (INTA–INTD) in 16-mode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 16/68 (pin 31) | Interface mode select input | Logic 1 = 16-mode (Intel bus); Logic 0 = 68-mode (Motorola bus); determines IOR/IOW vs R/W, INTA–INTD vs IRQ, CSA–CSD vs CS+A3+A4 mapping |
| CSA–CSD (pins 16,20,50,54) | Per-channel chip select inputs | Active-low enables data transfer to UART A–D individually in 16-mode; unused in 68-mode |
| INTA–INTD (pins 15,21,49,55) | Per-channel interrupt outputs | Active-high indicates pending TX/RX/error/modem event on UART A–D; enabled only in 16-mode |
| TXA–TXD (pins 17,19,51,53) | Serial transmit outputs | Asynchronous TTL-level serial output per channel; driven by respective 16-byte TX FIFO |
| RXA–RXD (pins 7,29,41,63) | Serial receive inputs | Asynchronous TTL-level serial input per channel; feeds into respective 16-byte RX FIFO with error flags |
| RTSA–RTSD (pins 14,22,48,56) | Request-to-send outputs | Active-low handshake signals controlled by Auto RTS (EFR[6]); used for hardware flow control per channel |
| CTSA–CTSD (pins 11,25,45,59) | Clear-to-send inputs | Active-low handshake signals monitored by Auto CTS (EFR[7]); suspend TX when asserted per channel |
| TXRDY / RXRDY (pins 39 / 38) | Global FIFO ready outputs | Wire-OR'd active-low signals indicating any TX FIFO has space (TXRDY) or any RX FIFO has data (RXRDY) |
Key Features
| Feature | Design Value |
|---|---|
| 16-byte TX/RX FIFO per channel | Reduces CPU interrupt frequency by ~16× versus legacy 1-byte buffers, enabling efficient handling of multi-channel serial traffic |
| Selectable FIFO interrupt trigger levels | Four programmable RX FIFO thresholds (1/4, 1/2, 3/4, 14-byte) allow tuning interrupt latency vs CPU overhead per channel |
| Auto hardware/software flow control | Eliminates software polling: EFR-controlled RTS/CTS handshake or Xon/Xoff character detection prevents buffer overflow without CPU intervention |
| IrDA 1.0 encoder/decoder | On-die infrared modulation/demodulation circuitry replaces external SIR PHY, simplifying design and reducing BOM cost for IR serial links |
| Dual-bus interface (16/68 mode) | Single device supports Intel 80x86 and Motorola 68k-based systems via pin-strapped configuration - avoids redesign for processor migration |
| Sleep mode | Reduces power consumption during idle periods while preserving register state - critical for energy-constrained industrial nodes |
Applications
| Industrial Serial Gateway | Legacy Equipment Interface |
|---|---|
Use Scenario: Aggregating RS-232/422 data from PLCs, sensors, and HMIs into Ethernet or fieldbus networks. IC Role / Device Role / Timing Role: Quad UART bridges parallel CPU bus to four isolated serial lines; IrDA enables wireless commissioning and diagnostics. Use Value: 16-byte FIFOs prevent data loss at 115.2 kbps across all four ports under Linux interrupt latency; dual-bus mode allows reuse in both x86 and PowerPC gateway platforms. | Use Scenario: Retrofitting modern microcontrollers into aging medical devices or point-of-sale terminals with native RS-232 requirements. IC Role / Device Role / Timing Role: Drop-in replacement for obsolete ST16C554; provides identical pinout and register set while adding IrDA for service technician access. Use Value: Pin-compatible with ST16C554 in 16-mode, enabling zero-layout-change upgrade; sleep mode extends battery life in portable diagnostic tools. |
| Multi-Channel Modem Bank | Telecom Line Card |
Use Scenario: Supporting concurrent dial-up, fax, and remote management sessions in carrier-grade access concentrators. IC Role / Device Role / Timing Role: Four independent UARTs handle simultaneous AT command parsing, data streaming, and modem status monitoring with hardware flow control. Use Value: Auto CTS/RTS per channel prevents buffer overrun at 56 kbps; 5 Mbit/s capability future-proofs for V.92/V.90 enhancements. | Use Scenario: Providing serial console, debug, and out-of-band management interfaces on telecom line cards with strict thermal and reliability constraints. IC Role / Device Role / Timing Role: UART subsystem for baseband processor communication; IrDA used for secure, short-range firmware updates without opening chassis. Use Value: Industrial temp rating (−40 °C to +85 °C) ensures operation in sealed, fanless enclosures; 2.5 V/3.3 V/5 V support simplifies power domain integration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad UART applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ST16C554CJ | No IrDA encoder/decoder; fixed 5 V operation only; no 2.5 V/3.3 V support | Lacks infrared capability and multi-voltage flexibility; requires external level shifters for 3.3 V systems | Select when IrDA is unnecessary and legacy 5 V-only design must maintain exact footprint and timing |
| TL16C554IPN | No IrDA; supports only 5 V; different PLCC68 pinout for interrupt and chip-select signals | Not pin-compatible in 16-mode due to relocated INTA–INTD and CSA–CSD pins; requires PCB revision | Choose only if existing layout matches TI's pin assignment and IrDA is omitted from system requirements |
Compared with ST16C554CJ and TL16C554IPN, the SC16C554DIA68 uniquely combines IrDA PHY, triple-voltage operation, and true 16/68-mode pin compatibility - making it the sole option for infrared-enabled, voltage-flexible, drop-in upgrades of legacy quad UART designs.
Availability
SC16C554DIA68 is available at Aetrix Electronics and suitable for industrial serial gateways, legacy equipment interface modules, and telecom line cards requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for SC16C554DIA68 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, formerly Philips Semiconductors, is a global leader in high-performance mixed-signal ICs for automotive, industrial, and communication applications, with deep expertise in serial interface and connectivity solutions.
The SC16C554/554D belongs to NXP's legacy UART product line, designed specifically for robust, multi-channel asynchronous serial communication in industrial control, telecom infrastructure, and embedded systems where reliability, pin compatibility, and extended temperature operation are critical.
FAQ
What interface modes does the SC16C554DIA68 support, and how is mode selection configured?
The SC16C554DIA68 supports both Intel 16-bit (16-mode) and Motorola 68-bit (68-mode) bus interfaces. Mode selection is controlled by pin 31 (16/68): a logic 1 configures 16-mode with IOR/IOW/CSA–CSD/INTA–INTD signals, while a logic 0 configures 68-mode with R/W/CS/A0–A4/IRQ. This single-pin configuration allows seamless integration across diverse host processor architectures without hardware changes.
Does the SC16C554DIA68 support infrared communication, and what standard does it implement?
Yes, the SC16C554DIA68 integrates a fully compliant IrDA 1.0 encoder/decoder. It handles pulse shaping, encoding (RZI), and decoding for SIR (Serial Infrared) physical layer operation at up to 115.2 kbps. No external transceiver is required, enabling compact, low-cost infrared serial links for diagnostics, configuration, and service access in the SC16C554DIA68-based design.
What is the maximum serial data rate supported by the SC16C554DIA68, and how does voltage affect performance?
The SC16C554DIA68 supports up to 5 Mbit/s at 5 V and 3.3 V supply voltages, and up to 3 Mbit/s at 2.5 V. This voltage-dependent speed scaling is inherent to its CMOS process and ensures reliable operation across mixed-voltage system designs. The baud rate generator accepts crystal (up to 24 MHz) or external clock inputs, allowing precise rate synthesis from DC to maximum rated speed.
How does the SC16C554DIA68 implement hardware flow control, and which pins are involved?
The SC16C554DIA68 implements per-channel automatic hardware flow control using RTS (output) and CTS (input) signals. When enabled via EFR bits [6] and [7], assertion of CTS halts transmission after the current character's stop bit, and deassertion resumes it. RTS is driven low when the receive FIFO reaches its programmed trigger level. Pins RTSA–RTSD and CTSA–CTSD are dedicated to this function on channels A–D respectively.
Is the SC16C554DIA68 pin-compatible with other industry-standard quad UARTs, and which models are confirmed compatible?
Yes, the SC16C554DIA68 is explicitly documented as pin-compatible with ST16C554 and TL16C554 in 16-mode operation. This compatibility covers pin functions, electrical characteristics, and register mapping. However, TL16C554IPN uses a different PLCC68 pinout for interrupt and chip-select signals, so direct substitution requires verification against the specific variant's datasheet.
SC16C554DIA68,529 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 68-LCC (J-Lead)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Features:
- -
- Number of Channels:
- 4, QUART
- FIFO's:
- 16 Byte
- Protocol:
- -
- Data Rate (Max):
- 5Mbps
- Voltage - Supply:
- 2.5V, 3.3V, 5V
- With Auto Flow Control:
- Yes
- With IrDA Encoder/Decoder:
- Yes
- With False Start Bit Detection:
- Yes
- With Modem Control:
- Yes
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 68-PLCC (24.18x24.18)
SC16C554DIA68,529 FAQ
1.How can I place an order for SC16C554DIA68,529 through Aetrix?
Please submit a Request for Quotation (RFQ) for SC16C554DIA68,529 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 SC16C554DIA68,529 reliable?
The price and inventory of SC16C554DIA68,529 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC16C554DIA68,529 is usually 5 days.
3.What payment methods are accepted for SC16C554DIA68,529?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC16C554DIA68,529 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC16C554DIA68,529?
SC16C554DIA68,529 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC16C554DIA68,529 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 SC16C554DIA68,529?
For technical support, including SC16C554DIA68,529 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC16C554DIA68,529 requirements.
6.How does Aetrix verify that SC16C554DIA68,529 is sourced from the original manufacturer or authorized distributors?
All SC16C554DIA68,529 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 SC16C554DIA68,529 meets industry standards.
7.What is the process for return or replacement of SC16C554DIA68,529?
All SC16C554DIA68,529 units undergo pre-shipment inspection (PSI). If there is an issue with SC16C554DIA68,529, 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 SC16C554DIA68,529 part is unused and in its original packaging.
Return procedure for SC16C554DIA68,529:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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