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NXP Semiconductors SC16C654BIA68,512
- Part No.:
- SC16C654BIA68,512
- Manufacturer:
- NXP Semiconductors
- Package:
- 68-LCC (J-Lead)
- Datasheet:
-
SC16C654BIA68,512.pdf
- Description:
- ID QUAD UART 64BYTE 68PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,454
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Product details
Overview
SC16C654BIA68 from NXP Semiconductors (formerly Philips) is a quad UART IC designed for high-throughput serial communication in industrial and embedded systems. It delivers 4 independent asynchronous channels, 64-byte transmit/receive FIFOs, up to 5 Mbit/s data rate at 5 V/3.3 V, and supports both Intel (16-mode) and Motorola (68-mode) bus interfaces - used in multi-port terminal servers, industrial PLCs, and legacy RS-232/422 bridge modules.
For engineers reviewing the SC16C654BIA68 datasheet, SC16C654BIA68 pinout, SC16C654BIA68 application, or SC16C654BIA68 equivalent, key selection criteria include its PLCC68 package with dual-mode bus compatibility, hardware/software flow control support, IrDA encoder/decoder capability, and industrial temperature range (−40 °C to +85 °C) operation.
Technical Context
The SC16C654BIA68 implements four fully independent UART channels sharing a common programmable baud rate generator and interrupt controller. Each channel features dedicated modem control signals (RTS/CTS/DSR/DTR/RI/CD), false start-bit detection, and complete status reporting via line/transmit/receive/modem status registers.
It supports two configurable interface modes: 16-mode (Intel-style with individual CSA–CSD chip selects and IOR/IOW strobes) and 68-mode (Motorola-style with CS + A3/A4 address decode), selected by the 16/68 input pin. Clock scaling is controlled via CLKSEL (1× or 4× pre-scaler), overridden post-reset by MCR[7].
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 4 independent UARTs - enables simultaneous serial links without external multiplexing. |
| Max Data Rate | 5 Mbit/s at 5 V/3.3 V; 3 Mbit/s at 2.5 V - supports high-speed modem and industrial fieldbus applications. |
| FIFO Depth | 64-byte TX/RX FIFO per channel - reduces CPU interrupt load by ~4× vs. 16C554 (16-byte FIFO). |
| Supply Voltage | 2.5 V / 3.3 V / 5 V operation - allows direct interfacing with mixed-voltage system buses. |
| Interface Modes | Selectable 16-mode (Intel) or 68-mode (Motorola) - eliminates need for external bus translators. |
| Temperature Range | −40 °C to +85 °C - qualified for industrial control cabinets and outdoor telecom equipment. |
| IrDA Support | Integrated infrared encoder/decoder - enables direct IRDA 1.0-compliant wireless serial links. |
Pinout & Package
SC16C654BIA68 uses a plastic leaded chip carrier (PLCC68) package (SOT188-2), 24.2 mm × 24.2 mm × 4.2 mm, with J-lead terminations suitable for through-hole or surface-mount reflow assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 16/68 | Interface mode select | Logic HIGH = 16-mode (Intel bus); LOW = 68-mode (Motorola bus); determines IOR/IOW vs. R/W and INTA–INTD vs. IRQ mapping. |
| CSA–CSD | Channel chip selects | Active-LOW enables UART A–D individually in 16-mode; unused in 68-mode. |
| IOR / IOW | Read/write strobes | Active-LOW control register access in 16-mode; replaced by R/W in 68-mode. |
| INTA–INTD | Per-channel interrupts | Active-HIGH outputs; individually maskable via IER; enabled only in 16-mode. |
| TXA–TXD / RXA–RXD | Serial data I/O | Four independent full-duplex UART data paths; TTL-level compatible. |
| RTSA–RTSD / CTSA–CTSD | Hardware flow control | Active-LOW RTS/CTS per channel; enables automatic flow control when EFR[6:7] set. |
| XTAL1 / XTAL2 | Crystal oscillator interface | Supports 1–24 MHz crystal; enables precise baud rate generation without external clock source. |
| CLKSEL | Baud rate pre-scaler select | Selects 1× or 4× internal clock division; overridden by MCR[7] after initialization. |
Key Features
| Feature | Design Value |
|---|---|
| Auto RTS/CTS flow control | Reduces software overhead by automatically asserting/deasserting RTS based on RX FIFO level and monitoring CTS state. |
| Four FIFO trigger levels | Programmable interrupt thresholds (1, 4, 8, 14 bytes) optimize interrupt frequency vs. latency trade-off per channel. |
| Sleep mode | Enters low-power state when no activity detected; resumes on RX/TX event or wake-up signal - extends battery life in portable devices. |
| IrDA encoder/decoder | Direct 3/16 or 1.6 µs pulse encoding/decoding per IrDA 1.0 spec - eliminates external IR transceiver IC. |
| False start-bit rejection | Filters noise-induced spurious start bits before sampling - improves reliability in electrically noisy industrial environments. |
Applications
| Industrial Terminal Server | Legacy Equipment Bridge |
|---|---|
Use Scenario: Connecting 4 RS-232 serial devices (HMI, barcode scanner, scale, PLC) to a single Ethernet or USB host in factory automation. IC Role / Device Role / Timing Role: Quad UART acts as parallel-to-serial converter with hardware flow control, managing concurrent bidirectional streams without CPU polling. Use Value: 64-byte FIFOs reduce interrupt servicing from every ~1.5 ms (16C554) to ~6.1 ms - freeing >75% of CPU cycles for protocol translation and diagnostics. | Use Scenario: Retrofitting aging CNC machines with modern controllers using RS-422/485 interfaces while retaining original serial peripherals. IC Role / Device Role / Timing Role: Provides isolated, galvanically separated UART channels with selectable 16/68 bus interface to match legacy microcontroller architecture. Use Value: Pin-compatible replacement for ST16C654 enables drop-in upgrade with no PCB changes, while adding IrDA and sleep mode for future-proofing. |
| Multi-Port Modem Rack | Secure Serial Console |
Use Scenario: Aggregating 4 analog modem lines into a centralized VoIP gateway or dial-up backup system. IC Role / Device Role / Timing Role: Manages AT command parsing, carrier detect (CD), ring indicator (RI), and DTR/DSR handshaking across all four lines simultaneously. Use Value: Dedicated modem control pins per channel (CTSA–CTSD, DSRA–DSRD, etc.) eliminate external logic, reducing BOM count and board area by 30%. | Use Scenario: Providing secure out-of-band management for network switches/routers via encrypted serial console port with tamper-evident logging. IC Role / Device Role / Timing Role: Delivers reliable, low-jitter serial framing with parity, stop bit, and overrun error detection - critical for firmware recovery and debug access. Use Value: Full status reporting (LSR, MSR, TCR) and internal loop-back diagnostics enable real-time link health monitoring without host intervention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad UART applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ST16C654CJ68 | Same PLCC68 package; identical pinout and register map; rated for commercial temp (0 °C to +70 °C) only. | Lacks industrial temperature rating and IrDA support; not suitable for uncontrolled ambient deployments. | Select when cost sensitivity outweighs extended temperature or IR requirements. |
| TL16C754BPTR | 64-pin LQFP; supports same 64-byte FIFOs and 5 Mbit/s rate but omits CLKSEL and INTSEL pins; requires external clock configuration. | No 16/68 mode flexibility; limited interrupt control (IRQ-only, no INTA–INTD); no sleep mode. | Choose for space-constrained designs where dual-bus compatibility is unnecessary and continuous-interrupt operation suffices. |
Compared with ST16C654CJ68 and TL16C754BPTR, the SC16C654BIA68 uniquely combines industrial temperature range, dual-bus interface, IrDA encoder/decoder, and sleep mode in a single PLCC68 package - making it optimal for ruggedized, feature-rich, and legacy-compatible serial infrastructure.
Availability
SC16C654BIA68 is available at Aetrix Electronics and suitable for industrial terminal servers, legacy equipment bridges, and multi-port modem racks requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for SC16C654BIA68 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.
The SC16C654BIA68 belongs to NXP's legacy UART product line, engineered for backward compatibility with 16C454/554 and forward scalability in multi-channel serial infrastructure - targeting industrial control, telecom gateways, and embedded communications systems.
FAQ
What bus interface modes does the SC16C654BIA68 support?
The SC16C654BIA68 supports both Intel-style 16-mode (with IOR/IOW and individual CSA–CSD chip selects) and Motorola-style 68-mode (with CS + A3/A4 address decode and R/W strobe), selected by the 16/68 pin. This dual-mode capability allows seamless integration with diverse microprocessor families without external glue logic - a key differentiator of the SC16C654BIA68 in mixed-architecture systems.
Does the SC16C654BIA68 support hardware flow control on all four UART channels?
Yes, the SC16C654BIA68 provides dedicated RTS and CTS pins for each of its four UART channels (RTSA–RTSD and CTSA–CTSD). When enabled via the Enhanced Feature Register (EFR[6:7]), automatic hardware flow control operates independently per channel, allowing dynamic throttling of transmit data based on remote receiver readiness - essential for reliable high-speed serial links in SC16C654BIA68-based designs.
What is the maximum data rate achievable with the SC16C654BIA68?
The SC16C654BIA68 achieves up to 5 Mbit/s at 5 V or 3.3 V supply, and 3 Mbit/s at 2.5 V. This performance is attainable using an external clock input; with a 24 MHz crystal, the maximum rate is 1.5 Mbit/s. These rates are confirmed in the official Philips/NXP datasheet Rev. 02 (2005) and apply directly to the SC16C654BIA68 in PLCC68 packaging.
Is the SC16C654BIA68 pin-compatible with older UARTs like the ST16C454?
Yes, the SC16C654BIA68 powers up functionally equivalent to the 16C454 and is pin-compatible with ST16C654 and TL16C754 in PLCC68 packaging. Its register set is backward-compatible, enabling drop-in replacement in existing designs - provided the application does not rely on features disabled by default (e.g., FIFOs or auto-flow control must be explicitly enabled via software configuration in the SC16C654BIA68).
Does the SC16C654BIA68 include infrared (IrDA) functionality?
Yes, the SC16C654BIA68 integrates a compliant IrDA 1.0 encoder/decoder, supporting 3/16 µs and 1.6 µs pulse widths. This eliminates the need for external IR transceiver ICs in applications such as wireless serial debug ports or short-range device pairing - a verified feature documented in the Philips SC16C654B/654DB datasheet section "Features" and functional description.
SC16C654BIA68,512 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:
- 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:
- 68-PLCC (24.18x24.18)
SC16C654BIA68,512 FAQ
1.How can I place an order for SC16C654BIA68,512 through Aetrix?
Please submit a Request for Quotation (RFQ) for SC16C654BIA68,512 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 SC16C654BIA68,512 reliable?
The price and inventory of SC16C654BIA68,512 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC16C654BIA68,512 is usually 5 days.
3.What payment methods are accepted for SC16C654BIA68,512?
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4.How is shipping managed for SC16C654BIA68,512?
SC16C654BIA68,512 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC16C654BIA68,512 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 SC16C654BIA68,512?
For technical support, including SC16C654BIA68,512 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC16C654BIA68,512 requirements.
6.How does Aetrix verify that SC16C654BIA68,512 is sourced from the original manufacturer or authorized distributors?
All SC16C654BIA68,512 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 SC16C654BIA68,512 meets industry standards.
7.What is the process for return or replacement of SC16C654BIA68,512?
All SC16C654BIA68,512 units undergo pre-shipment inspection (PSI). If there is an issue with SC16C654BIA68,512, 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 SC16C654BIA68,512 part is unused and in its original packaging.
Return procedure for SC16C654BIA68,512:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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