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NXP Semiconductors SC16C554DIB64,157
- Part No.:
- SC16C554DIB64,157
- Manufacturer:
- NXP Semiconductors
- Package:
- 64-LQFP
- Datasheet:
-
SC16C554DIB64,157.pdf
- Description:
- IC UART QUAD 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,703
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Product details
Overview
SC16C554DIB64 from NXP Semiconductors (formerly Philips) is a quad UART IC with 16-byte transmit/receive FIFOs, IrDA infrared encoder/decoder, and dual-bus interface support (Intel 16-mode only in this LQFP64 variant). It operates at 5 V / 3.3 V / 2.5 V, supports up to 5 Mbit/s data rates, and delivers hardware/software flow control for industrial serial communication systems requiring multi-channel RS-232/RS-485 bridge interfaces.
For engineers reviewing the SC16C554DIB64 datasheet, SC16C554DIB64 pinout, SC16C554DIB64 application, or SC16C554DIB64 equivalent, key selection criteria include its LQFP64 package with 64-pin Intel-compatible bus interface, continuous-interrupt mode (INTSEL bonded to VCC), 16-byte FIFO trigger programmability, and integrated IrDA physical layer support - all critical for legacy system upgrades and embedded telecom interface cards.
Technical Context
The SC16C554DIB64 implements four independent asynchronous serial channels sharing a single 8-bit bidirectional data bus (D0–D7), with register addressing via A0–A2 and chip-select logic (CSA–CSD). Its architecture integrates dedicated FIFO control logic, enhanced feature register (EFR)-driven auto-RTS/CTS flow control, and dual-mode clocking (XTAL1/XTAL2 or external clock).
Unlike PLCC68 variants, the LQFP64 version operates exclusively in 16-mode (Intel bus), lacks INTSEL pin (internally tied to VCC for continuous interrupt enable), and omits A3/A4 address lines - simplifying integration into x86 or ARM-based industrial controllers where discrete channel interrupts (INTA–INTD) and per-channel CS signals are required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | Up to 5 Mbit/s at 5 V/3.3 V; enables high-speed modem and ISDN terminal interfaces without external rate limiting. |
| FIFO Depth | 16-byte TX/RX FIFO per channel; reduces CPU interrupt load by >75% vs. legacy 1-byte-buffer UARTs in burst-traffic applications. |
| Supply Voltage | 2.5 V / 3.3 V / 5 V operation; supports mixed-voltage board designs and backward compatibility with legacy 5 V systems. |
| Interface Mode | Intel 16-mode only (no 68-mode); uses IOR/IOW strobes and individual CSA–CSD chip selects - compatible with standard PC/ISA bus timing. |
| IrDA Support | Integrated infrared encoder/decoder per channel; eliminates need for external IrDA PHY, enabling compact wireless serial debug ports. |
| Interrupt Logic | Four independent active-HIGH interrupts (INTA–INTD); allows prioritized, channel-specific servicing without software polling overhead. |
| Temperature Range | Industrial grade (−40 °C to +85 °C); qualified for deployment in factory automation PLCs and outdoor telecom cabinets. |
Pinout & Package
LQFP64 package: plastic low-profile quad flat package, 10 × 10 × 1.4 mm body, 64 leads, lead pitch 0.5 mm, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CSA–CSD | Individual channel chip select (active-low) | Enables selective access to UART A/B/C/D registers without address decoding logic - simplifies FPGA/CPU interface design. |
| TXA–TXD, RXA–RXD | Serial transmit/receive I/O per channel | Dedicated pins per UART allow simultaneous full-duplex operation across all four channels with no time-division multiplexing. |
| INTA–INTD | Per-channel interrupt output (active-high) | Eliminates need for interrupt arbitration logic; each UART asserts its own interrupt line for deterministic real-time response. |
| D0–D7 | 8-bit bidirectional data bus | Shared bus reduces PCB trace count; 3-state drive allows coexistence with other peripherals on same data path. |
| A0–A2 | Register address select | Three address bits decode 8 internal registers (THR, IER, FCR, LCR, MCR, LSR, MSR, SPR) per UART channel. |
| IOR / IOW | Read/write strobe control | Synchronizes register access to CPU bus cycles - matches standard ISA/PCI bus timing requirements. |
| RTSA–RTSD, CTSA–CTSD | Hardware flow control I/O | Enables automatic RTS/CTS handshaking per channel, preventing buffer overflow in high-throughput serial links. |
| XTAL1 / XTAL2 | Clock input/output | Supports 24 MHz crystal for 1.5 Mbit/s operation or external clock for precise baud rate generation up to 5 Mbit/s. |
Key Features
| Feature | Design Value |
|---|---|
| 16-byte FIFO with 4 trigger levels | Configurable RX interrupt thresholds (1/4/8/14 bytes) optimize interrupt frequency vs. latency trade-off for varying traffic profiles. |
| Auto hardware/software flow control | Reduces host CPU utilization by >60% in multi-channel data concentrators by eliminating manual XON/XOFF parsing and RTS toggling. |
| IrDA encoder/decoder per channel | Enables direct connection to IR transceivers (e.g., TFDU4101) without level-shifting or protocol translation ICs. |
| Continuous interrupt mode (INTSEL = VCC) | Guarantees immediate interrupt assertion on event - critical for real-time industrial protocols like Modbus RTU over RS-485. |
| Programmable character format | Supports 5–8 bit words, 1/1.5/2 stop bits, even/odd/no parity - ensures interoperability with legacy mainframe terminals and medical devices. |
Applications
| Industrial Serial Gateway | Legacy Terminal Adapter |
|---|---|
Use Scenario: Aggregating data from 4 RS-232 field devices (PLC, sensor nodes, barcode scanners) into a single Ethernet or CAN backbone. IC Role / Device Role / Timing Role: Quad UART acts as parallel-to-serial bridge with independent FIFO buffering per port, synchronizing asynchronous device clocks to system bus timing. Use Value: 16-byte FIFOs prevent data loss during CPU context switches; per-channel INTA–INTD enable deterministic interrupt handling in RTOS environments. | Use Scenario: Connecting vintage VT100/IBM 3270 terminals to modern Linux servers via USB-to-serial adapters with full modem control signal emulation. IC Role / Device Role / Timing Role: UART provides complete RS-232 physical layer including DTR/DSR/RTS/CTS/RING/CD signaling and precise start/stop bit framing. Use Value: Hardware flow control and programmable baud rates (DC to 5 Mbit/s) ensure bit-perfect compatibility with 1970s–1990s terminal timing specifications. |
| Telecom Line Card | Embedded Wireless Debug Port |
Use Scenario: 4-port E1/T1 channel bank card in carrier-grade access equipment requiring simultaneous HDLC framing and alarm reporting. IC Role / Device Role / Timing Role: UART handles out-of-band management channel for firmware updates and fault logging while primary DSP handles payload processing. Use Value: Sleep mode reduces standby power to <100 µA per channel; IrDA support enables secure, contactless firmware patching without opening chassis. | Use Scenario: On-board infrared debug interface for headless IoT edge nodes deployed in sealed enclosures (e.g., smart meters, HVAC controllers). IC Role / Device Role / Timing Role: IrDA PHY layer transceiver converting UART serial frames to 115.2 kbit/s IR pulses compliant with IrDA 1.0 SIR standard. Use Value: Integrated encoder/decoder eliminates external transceiver IC, saving 3 mm² PCB area and reducing BOM cost by $0.35/unit at volume. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad UART applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL16C554IPN | Same 64-pin LQFP package, 5 V only, no IrDA, no 2.5 V/3.3 V support | Lacks infrared capability and multi-voltage operation; suitable only for legacy 5 V-only systems | Select TL16C554IPN only when IrDA and voltage flexibility are unnecessary and TI's long-term supply commitment is preferred. |
| ST16C554CJ | PLCC68 package, supports both 16/68 bus modes, includes INTSEL pin for configurable interrupt behavior | Requires different PCB layout and socket; offers mode flexibility but larger footprint and higher thermal resistance | Choose ST16C554CJ if 68-mode compatibility or interrupt gating via INTSEL is required, accepting larger package size. |
Compared with TL16C554IPN and ST16C554CJ, the SC16C554DIB64 uniquely combines LQFP64 compactness, triple-voltage operation, integrated IrDA, and fixed continuous-interrupt mode - making it optimal for space-constrained, multi-standard industrial gateways where firmware update security and legacy voltage support are mandatory.
Availability
SC16C554DIB64 is available at Aetrix Electronics and suitable for industrial serial gateways, legacy terminal adapters, telecom line cards, and embedded wireless debug ports requiring stable component supply across extended product lifecycles.
Supply support for SC16C554DIB64 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 markets, with deep expertise in serial interface solutions.
The SC16C554/554D product line was designed specifically for high-reliability multi-channel serial bridging in industrial control, telecom infrastructure, and legacy system modernization - emphasizing FIFO efficiency, voltage flexibility, and integrated IrDA PHY.
FAQ
What is the maximum data rate supported by the SC16C554DIB64?
The SC16C554DIB64 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 is achieved using an external clock input; with a 24 MHz crystal, the maximum achievable rate is 1.5 Mbit/s. The actual usable rate depends on the selected divisor value in the baud rate generator registers (DLL/DLM) and must be validated against timing margins in the target application.
Does the SC16C554DIB64 support both Intel and Motorola bus interfaces?
No, the SC16C554DIB64 supports Intel 16-mode only. Unlike the PLCC68 variant, the LQFP64 package does not include the 16/68 mode-select pin and is hardwired for 16-mode operation with IOR/IOW strobes and individual CSA–CSD chip selects. This simplifies design for x86, ARM, or other processors using standard Intel-style bus timing.
How does the SC16C554DIB64 handle interrupt generation compared to earlier 16C554 variants?
The SC16C554DIB64 provides four independent active-HIGH interrupt outputs (INTA–INTD), one per UART channel, and operates in continuous-interrupt mode because the INTSEL pin is internally bonded to VCC. This differs from variants with external INTSEL control, ensuring immediate interrupt assertion without software gating - critical for deterministic response in real-time industrial protocols.
Can the SC16C554DIB64 be used for infrared communication without external components?
Yes, the SC16C554DIB64 includes fully integrated IrDA encoder/decoder circuitry per channel, compliant with IrDA 1.0 SIR (115.2 kbit/s). When paired with a standard IR transceiver (e.g., Vishay TFDU4101), no additional protocol logic or level-shifting ICs are required - enabling compact, low-cost wireless debug and configuration interfaces.
What are the key differences between SC16C554DIB64 and SC16C554IB64?
The SC16C554DIB64 includes the "D" suffix indicating enhanced features: automatic hardware/software flow control, IrDA support, and deeper FIFO status visibility. The SC16C554IB64 lacks these enhancements and functions as a basic quad UART. Both share the same LQFP64 package and 16-mode interface, but only SC16C554DIB64 supports EFR-programmed RTS/CTS and infrared encoding/decoding.
SC16C554DIB64,157 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 64-LQFP
- Series:
- -
- Packaging:
- Tray
- 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:
- 64-LQFP (10x10)
SC16C554DIB64,157 FAQ
1.How can I place an order for SC16C554DIB64,157 through Aetrix?
Please submit a Request for Quotation (RFQ) for SC16C554DIB64,157 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 SC16C554DIB64,157 reliable?
The price and inventory of SC16C554DIB64,157 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC16C554DIB64,157 is usually 5 days.
3.What payment methods are accepted for SC16C554DIB64,157?
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4.How is shipping managed for SC16C554DIB64,157?
SC16C554DIB64,157 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC16C554DIB64,157 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 SC16C554DIB64,157?
For technical support, including SC16C554DIB64,157 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC16C554DIB64,157 requirements.
6.How does Aetrix verify that SC16C554DIB64,157 is sourced from the original manufacturer or authorized distributors?
All SC16C554DIB64,157 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 SC16C554DIB64,157 meets industry standards.
7.What is the process for return or replacement of SC16C554DIB64,157?
All SC16C554DIB64,157 units undergo pre-shipment inspection (PSI). If there is an issue with SC16C554DIB64,157, 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 SC16C554DIB64,157 part is unused and in its original packaging.
Return procedure for SC16C554DIB64,157:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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