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NXP Semiconductors SC16C654DBIB64,151
- Part No.:
- SC16C654DBIB64,151
- Manufacturer:
- NXP Semiconductors
- Package:
- 64-LQFP
- Datasheet:
-
SC16C654DBIB64,151.pdf
- Description:
- IC UART QUAD W/FIFO 64-LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,429
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Product details
Overview
SC16C654DBIB64 from NXP Semiconductors (formerly Philips) is a quad UART IC designed for high-throughput serial communications in embedded industrial and networking systems. It supports 5 Mbit/s data rates at 3.3 V/5 V, integrates 64-byte transmit/receive FIFOs per channel, features automatic hardware/software flow control (RTS/CTS, Xon/Xoff), and operates across −40 °C to +85 °C. It serves as a drop-in upgrade for legacy 16C454/554-based designs requiring higher buffer depth and multi-channel efficiency.
For engineers reviewing the SC16C654DBIB64 datasheet, SC16C654DBIB64 pinout, SC16C654DBIB64 application, or SC16C654DBIB64 equivalent, key selection criteria include its LQFP64 package with Intel-style 16-mode bus interface, 64-byte FIFO interrupt trigger programmability, IrDA encoder/decoder support, 5 V-tolerant inputs, and continuous-interrupt mode enabled via internal INTSEL-to-VCC bonding - critical for real-time multi-UART host controller integration.
Technical Context
The SC16C654DBIB64 implements four independent asynchronous receiver/transmitter channels sharing a common 8-bit bidirectional data bus (D0–D7), address decoding (A0–A2), and chip-select logic (CSA–CSD). Its dual-mode interface (16/68) is fixed to 16-mode only in this LQFP64 variant, eliminating R/W and IRQ pins while retaining IOR/IOW, individual INTA–INTD outputs, and full modem signal support (RTS/CTS/DSR/DTR/RI/CD) on all four channels.
Internally, it uses a programmable baud rate generator driven by XTAL1/XTAL2 (up to 24 MHz crystal) or external clock, supporting DC to 5 Mbit/s (3 Mbit/s at 2.5 V). The enhanced feature register (EFR) enables auto-RTS/CTS flow control, FIFO trigger level selection (1/4/8/14 bytes), and infrared encoding/decoding - all configurable per channel via dedicated control registers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | Up to 5 Mbit/s at 3.3 V or 5 V; enables high-speed modem and industrial serial link operation without oversampling bottlenecks. |
| FIFO Depth | 64-byte TX and RX FIFO per channel; reduces CPU interrupt load by ~4× vs. 16C554, extending service intervals from 1.53 ms to 6.1 ms at 115.2 kbit/s. |
| Supply Voltage | 2.5 V / 3.3 V / 5 V operation; supports mixed-voltage system integration and backward compatibility with legacy 5 V designs. |
| Interface Mode | 16-mode only (Intel bus); uses IOR/IOW strobes, CSA–CSD chip selects, and discrete INTA–INTD outputs - no 68-mode R/W or IRQ pin required. |
| Temperature Range | −40 °C to +85 °C industrial grade; validated for deployment in factory automation, telecom infrastructure, and outdoor embedded gateways. |
| IrDA Support | Integrated infrared encoder/decoder; eliminates external IrDA PHY components for short-range wireless serial bridging. |
| Input Tolerance | 5 V-tolerant inputs; allows direct connection to 5 V logic buses even when core operates at 2.5 V or 3.3 V. |
Pinout & Package
SC16C654DBIB64 is housed in a plastic low-profile quad flat package (LQFP64) measuring 10 × 10 × 1.4 mm (SOT314-2), with 64 leads and exposed thermal pad. Pin functions are defined for 16-mode operation only; INTSEL is internally bonded to VCC to enable continuous interrupt output mode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CSA–CSD | Individual channel chip select (active LOW) | Selects UART A–D independently; enables simultaneous multi-port access without address decoding overhead. |
| INTA–INTD | Per-channel interrupt output (active HIGH) | Provides prioritized, non-shared interrupt signaling - avoids arbitration latency in time-critical serial polling. |
| RTSA–RTSD / CTSA–CTSD | Request-to-Send / Clear-to-Send (active LOW) | Hardware flow control signals per channel; auto-controlled via EFR[6]/[7] to prevent FIFO overrun without CPU intervention. |
| RXA–RXD / TXA–TXD | Serial data input/output per channel | Full-duplex asynchronous I/O; supports standard framing (5–8 bit, 1/1.5/2 stop, parity) and false start-bit rejection. |
| D0–D7 | 8-bit bidirectional data bus | 3-state TTL-compatible interface; shares bus with host microcontroller using IOR/IOW strobes and A0–A2 addressing. |
| IOR / IOW | Read/Write strobe (active LOW) | Enables register read/write cycles synchronized to host bus timing - essential for deterministic driver implementation. |
| RESET | Asynchronous reset input | Clears all internal registers and disables TX/RX; asserts logic 1 to reset, compatible with standard microcontroller reset circuits. |
| XTAL1 / XTAL2 | Clock input/output | Supports 1–24 MHz crystal or external clock; determines maximum baud rate accuracy and jitter performance. |
Key Features
| Feature | Design Value |
|---|---|
| Quad UART with 64-byte FIFOs | Enables concurrent high-bandwidth serial streams (e.g., GPS + RS-485 + debug + modem) while reducing host CPU interrupt frequency by factor of 4. |
| Auto RTS/CTS hardware flow control | Eliminates software-managed handshaking delays; prevents data loss during burst transfers in industrial PLC backplanes. |
| Programmable FIFO interrupt triggers | Four selectable levels (1/4/8/14 bytes) per channel allow fine-grained trade-off between latency and CPU utilization in real-time OS environments. |
| IrDA encoder/decoder integrated | Removes need for external SIR/FIR PHY; supports 9.6–115.2 kbit/s infrared links for maintenance port or sensor node commissioning. |
| 5 V-tolerant digital inputs | Permits direct interfacing with legacy 5 V peripherals (e.g., MAX232 drivers) without level-shifting circuitry - simplifies BOM and layout. |
| Continuous interrupt mode (INTSEL = VCC) | Ensures deterministic interrupt response timing; avoids metastability risks from 3-state output enable/disable transitions in safety-critical firmware. |
Applications
| Industrial PLC Serial Backplane | Multi-Port Cellular Gateway |
|---|---|
Use Scenario: Connecting up to four fieldbus modules (Modbus RTU, Profibus DP slaves) to a central ARM Cortex-A processor via isolated RS-485 transceivers. IC Role / Device Role / Timing Role: Quad UART acts as serial protocol concentrator, buffering and scheduling packets across independent DMA channels while maintaining strict inter-character timing. Use Value: 64-byte FIFOs absorb burst traffic from multiple sensors, reducing context-switch overhead by 75% versus 16C554 - enabling deterministic 10 ms cycle times. | Use Scenario: Aggregating LTE modem AT command interface, GNSS NMEA stream, Bluetooth HCI transport, and debug console on a compact 4G router PCB. IC Role / Device Role / Timing Role: SC16C654DBIB64 serves as host-side serial multiplexer, managing concurrent low-latency AT responses and high-throughput GPS data with independent baud rate settings. Use Value: Per-channel programmable FIFO triggers and auto-flow control prevent buffer overflow during LTE handover events, ensuring zero packet loss in mission-critical telemetry. |
| Medical Diagnostic Equipment | Smart Grid Substation Controller |
Use Scenario: Interfacing ultrasound probe digitizers, patient monitor vitals, barcode scanner, and thermal printer in portable diagnostic cart. IC Role / Device Role / Timing Role: Provides isolated, EMI-hardened serial paths with IrDA support for wireless calibration tool pairing and secure firmware updates. Use Value: 5 V-tolerant inputs accept legacy RS-232 voltage levels directly; industrial temp range ensures reliability during extended field deployments. | Use Scenario: Communicating with IEDs (Intelligent Electronic Devices), PMUs (Phasor Measurement Units), and RTUs over redundant RS-485/RS-232 links in utility substations. IC Role / Device Role / Timing Role: Acts as hardened serial front-end with hardware flow control, supporting IEEE C37.118 synchrophasor streaming at 120 frames/sec. Use Value: Auto-RTS/CTS coordination across all four ports guarantees uninterrupted high-priority PMU data delivery under heavy network congestion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad UART applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ST16C654CJ | Same 64-byte FIFOs and 16-mode interface, but rated only to +70 °C and lacks IrDA encoder/decoder. | Suitable for commercial-grade embedded systems where infrared capability is unnecessary and ambient temperature stays below 70 °C. | Choose ST16C654CJ only if industrial temperature range and IrDA are not required - lower cost alternative for non-ruggedized designs. |
| TL16C754BIPM | Pin-compatible with SC16C654DB but uses different register mapping; requires driver adaptation; supports same 5 Mbit/s and FIFO depth. | Used in TI ecosystem designs where C2000 or Sitara processors leverage TI-specific UART HAL libraries. | Select TL16C754BIPM when migrating from TI reference designs or when vendor lock-in to TI toolchains justifies firmware rework. |
Compared with ST16C654CJ and TL16C754BIPM, the SC16C654DBIB64 uniquely delivers industrial temperature rating, integrated IrDA, and guaranteed continuous-interrupt behavior - making it optimal for field-deployed equipment requiring zero-modification firmware reuse and long-term environmental resilience.
Availability
SC16C654DBIB64 is available at Aetrix Electronics and suitable for industrial automation, telecom infrastructure, and medical device manufacturing requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.
Supply support for SC16C654DBIB64 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 is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT applications, with deep heritage in communication interface IP dating back to Philips Semiconductor.
The SC16C654DBIB64 belongs to NXP's legacy high-performance UART product line, engineered specifically for multi-channel serial consolidation in resource-constrained embedded hosts - emphasizing FIFO efficiency, interrupt determinism, and mixed-voltage interoperability.
FAQ
What is the maximum data rate supported by the SC16C654DBIB64?
The SC16C654DBIB64 supports up to 5 Mbit/s at 3.3 V or 5 V supply, and 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 SC16C654DBIB64 achieves this performance through optimized shift register design and low-latency FIFO buffering - critical for high-speed modem and industrial serial applications.
Does the SC16C654DBIB64 support both Intel and Motorola bus interfaces?
No - the SC16C654DBIB64 is configured exclusively for the 16-mode (Intel-style) interface. Its LQFP64 package omits 68-mode pins (R/W, IRQ, A3/A4), and INTSEL is internally bonded to VCC to enforce continuous interrupt output. This differs from the PLCC68 version, which supports mode selection via the 16/68 pin. The SC16C654DBIB64 is therefore optimized for Intel-compatible microcontrollers and avoids mode configuration complexity.
How does the SC16C654DBIB64 handle hardware flow control across its four UART channels?
The SC16C654DBIB64 provides dedicated RTS and CTS pins for each of its four UART channels (RTSA–RTSD, CTSA–CTSD), and supports automatic hardware flow control via Enhanced Feature Register bits EFR[6] (auto-RTS) and EFR[7] (auto-CTS). When enabled, these features dynamically assert/deassert RTS based on TX FIFO fill level and monitor CTS to pause transmission - all without CPU involvement. This ensures reliable data transfer in multi-channel industrial networks where timing predictability is essential.
Is the SC16C654DBIB64 pin-compatible with the ST16C654?
Yes - the SC16C654DBIB64 is explicitly stated as pin-compatible with the ST16C654 and TL16C754 in the datasheet. Both share identical LQFP64 pinout, 16-mode interface signals (IOR/IOW, CSA–CSD, INTA–INTD), and power/ground assignments. However, firmware must initialize the SC16C654DBIB64's enhanced registers (EFR, FCR) to unlock 64-byte FIFOs and auto-flow features absent in the ST16C654 - making it a functional superset, not just a drop-in replacement.
What is the purpose of the INTSEL pin being bonded to VCC in the SC16C654DBIB64?
In the SC16C654DBIB64, the INTSEL pin is internally bonded to VCC to force continuous interrupt output mode - meaning INTA–INTD remain active HIGH (not 3-state) whenever an interrupt condition occurs. This eliminates timing uncertainty from output-enable transitions, improves interrupt latency predictability, and simplifies driver development. In contrast, the SC16C654BIB64 bonds INTSEL to GND, requiring MCR[3] control. This distinction makes SC16C654DBIB64 ideal for real-time systems where deterministic interrupt response is mandatory.
SC16C654DBIB64,151 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:
- 64 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)
SC16C654DBIB64,151 FAQ
1.How can I place an order for SC16C654DBIB64,151 through Aetrix?
Please submit a Request for Quotation (RFQ) for SC16C654DBIB64,151 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 SC16C654DBIB64,151 reliable?
The price and inventory of SC16C654DBIB64,151 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC16C654DBIB64,151 is usually 5 days.
3.What payment methods are accepted for SC16C654DBIB64,151?
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Once your SC16C654DBIB64,151 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 SC16C654DBIB64,151?
For technical support, including SC16C654DBIB64,151 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC16C654DBIB64,151 requirements.
6.How does Aetrix verify that SC16C654DBIB64,151 is sourced from the original manufacturer or authorized distributors?
All SC16C654DBIB64,151 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 SC16C654DBIB64,151 meets industry standards.
7.What is the process for return or replacement of SC16C654DBIB64,151?
All SC16C654DBIB64,151 units undergo pre-shipment inspection (PSI). If there is an issue with SC16C654DBIB64,151, 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 SC16C654DBIB64,151 part is unused and in its original packaging.
Return procedure for SC16C654DBIB64,151:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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