My Inquiry
My Account
NXP Semiconductors SC16C654IA68,512
- Part No.:
- SC16C654IA68,512
- Manufacturer:
- NXP Semiconductors
- Package:
- 68-LCC (J-Lead)
- Datasheet:
-
SC16C654IA68,512.pdf
- Description:
- IC QUAD UART 64BYTE 68PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,560
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SC16C654IA68,512 from NXP Semiconductors (formerly Philips) is a quad UART IC with 64-byte transmit/receive FIFOs, IrDA infrared encoder/decoder, and dual-mode (Intel 16-/Motorola 68-) bus interface. It operates at 5 V, 3.3 V, or 2.5 V, supports up to 5 Mbit/s data rates, and delivers hardware/software flow control for industrial serial communication systems.
For engineers reviewing the SC16C654IA68,512 datasheet, SC16C654IA68,512 pinout, SC16C654IA68,512 application, or SC16C654IA68,512 equivalent, key selection criteria include quad-channel asynchronous serial I/O with deep FIFO buffering, IrDA physical layer support, voltage-flexible operation, and compatibility with legacy 16C454/554 and ST16C654 designs.
Technical Context
The SC16C654IA68,512 implements four independent UART channels sharing a single 64-byte TX/RX FIFO per channel, with programmable trigger levels (1/4/8/14 bytes), automatic RTS/CTS flow control via EFR[6–7], and integrated IrDA encoder/decoder logic. Its dual-bus interface (16- or 68-mode) is selected by the 16/68 pin, enabling direct integration with Intel- or Motorola-based host controllers without glue logic.
It features a fully programmable baud rate generator supporting DC to 1.5 Mbit/s with crystal input (up to 5 Mbit/s with external clock), false start-bit detection, line-break generation/detection, and prioritized interrupt architecture with individual channel status reporting via LSR/MSR registers - all implemented in advanced CMOS for low-power industrial operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 4 independent UARTs with full modem control (RTS/CTS/DSR/DTR/RI/CD) |
| FIFO depth | 64-byte transmit and receive buffers per channel - reduces CPU interrupt load by ~4× vs. 16-byte FIFO devices |
| Max data rate | 5 Mbit/s at 5 V/3.3 V; 3 Mbit/s at 2.5 V - enables high-speed modem and network interface use |
| Supply voltage | 2.5 V / 3.3 V / 5 V - supports mixed-voltage system integration and legacy board upgrades |
| Interface mode | Selectable Intel 16-mode or Motorola 68-mode via 16/68 pin - eliminates need for external bus translators |
| IrDA support | Integrated infrared encoder/decoder compliant with IrDA 1.0 physical layer - enables direct IR link without external transceiver |
| Operating temp | −40 °C to +85 °C industrial range - qualified for embedded control, telecom, and factory automation |
Pinout & Package
SC16C654IA68,512 is housed in a plastic leaded chip carrier (PLCC68) package with 68 leads, SOT188-2 footprint, and 25.4 mm × 25.4 mm body size. Pin functions are mode-dependent (16- or 68-mode), with dedicated chip selects (CSA–CSD), interrupt outputs (INTA–INTD), and IrDA-capable RX/TX pairs per channel.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 16/68 | Interface mode select | Logic HIGH = Intel 16-mode (IOR/IOW/CSA–CSD); LOW = Motorola 68-mode (R/W/CS/A3–A4) |
| CSA–CSD | Channel chip selects | Active-LOW enables UART A–D individually in 16-mode; unused in 68-mode |
| INTA–INTD | Per-channel interrupts | Active-HIGH outputs for dedicated IRQ routing - avoids software polling overhead |
| TXA–TXD / RXA–RXD | Serial I/O | Dedicated transmit/receive pins per channel; support IrDA modulation when enabled |
| RTSA–RTSD / CTSA–CTSD | Hardware flow control | Active-LOW RTS outputs and CTS inputs - enable automatic buffer management without CPU intervention |
Key Features
| Feature | Design Value |
|---|---|
| 64-byte FIFO per channel | Extends interrupt service interval from ~1.5 ms (16-byte FIFO) to ~6.1 ms at 115.2 kbit/s - frees CPU cycles for higher-layer tasks |
| Auto hardware flow control | Enables RTS/CTS handshaking via EFR bits - prevents data loss during burst transfers without software overhead |
| Dual bus interface | Single device supports both Intel and Motorola microprocessor buses - simplifies design reuse across platforms |
| IrDA encoder/decoder | On-die infrared PHY logic - eliminates external IrDA transceiver, reducing BOM count and PCB area |
| Sleep mode | Reduces power consumption during idle periods - extends runtime in battery-powered serial gateways |
Applications
| Industrial Serial Gateway | Legacy System Upgrade |
|---|---|
Use Scenario: Connecting PLCs, HMIs, and sensors over RS-232/422/485 in factory automation. IC Role / Device Role / Timing Role: Quad UART bridges parallel CPU bus to four independent serial links with full modem signaling and IrDA fallback. Use Value: 64-byte FIFOs sustain 460.8 kbit/s throughput across all channels while maintaining <1% CPU utilization for data movement. | Use Scenario: Replacing obsolete ST16C454/554 in existing 16-bit ISA or CompactPCI backplanes. IC Role / Device Role / Timing Role: Pin-compatible drop-in upgrade delivering 4× deeper FIFOs and IrDA without PCB redesign. Use Value: Maintains identical 16-mode timing and register map while adding sleep mode and auto-flow control for lower system power. |
| Multi-Port Modem Card | Embedded IR Communication Hub |
Use Scenario: Telecom access concentrators requiring four simultaneous V.34/V.92 modem interfaces. IC Role / Device Role / Timing Role: Handles parallel-to-serial conversion, framing, parity, and modem control signals for four analog lines. Use Value: Hardware RTS/CTS and programmable FIFO triggers prevent buffer overflow during 56 kbit/s upstream bursts. | Use Scenario: Medical or retail devices needing short-range wireless serial via infrared (e.g., barcode scanner sync). IC Role / Device Role / Timing Role: Provides IrDA 1.0-compliant physical layer encoding/decoding with integrated UART logic. Use Value: Eliminates discrete IR transceiver IC and associated resistors/capacitors - reduces bill-of-materials by 7 components per port. |
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 and 64-byte FIFO; lacks integrated IrDA encoder/decoder | Requires external IrDA transceiver for infrared use; otherwise functionally identical in 16-mode | Choose when IrDA is not required and STMicroelectronics sourcing is preferred |
| TL16C754BPTR | 64-byte FIFO and 16-mode interface; operates only at 3.3 V, no 2.5 V/5 V support | Not suitable for mixed-voltage or legacy 5 V systems; no IrDA capability | Choose for new 3.3 V-only designs where TI supply chain alignment is critical |
Compared with ST16C654CJ68 and TL16C754BPTR, the SC16C654IA68,512 uniquely integrates IrDA PHY logic and supports triple-voltage operation (2.5/3.3/5 V), making it the only option for infrared-capable, voltage-flexible quad UART upgrades without external components.
Availability
SC16C654IA68,512 is available at Aetrix Electronics and suitable for industrial serial gateways, legacy system upgrades, multi-port modem cards, and embedded IR communication hubs requiring stable component supply and long-term obsolescence mitigation.
Supply support for SC16C654IA68,512 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 SC16C654IA68,512 belongs to NXP's legacy high-performance UART product line, designed specifically for industrial-grade serial communication systems requiring deep FIFO buffering, multi-voltage operation, and integrated IrDA physical layer support.
FAQ
What voltage levels does the SC16C654IA68,512 support?
The SC16C654IA68,512 supports three supply voltages: 2.5 V, 3.3 V, and 5 V. At 5 V and 3.3 V, it achieves up to 5 Mbit/s data rates; at 2.5 V, maximum speed is 3 Mbit/s. This triple-voltage capability allows seamless integration into mixed-signal systems and backward-compatible upgrades of legacy 5 V boards without level-shifting circuitry.
Does the SC16C654IA68,512 include IrDA functionality?
Yes, the SC16C654IA68,512 integrates a complete IrDA 1.0-compliant infrared encoder and decoder within the same die. This eliminates the need for an external IrDA transceiver IC, reducing component count, PCB area, and system cost - particularly valuable in space-constrained medical, point-of-sale, and industrial handheld devices.
How does the SC16C654IA68,512 handle interrupt management across four UART channels?
The SC16C654IA68,512 provides four dedicated active-HIGH interrupt outputs (INTA–INTD) in 16-mode, enabling hardware-routed, non-polling interrupt handling per channel. Each interrupt is independently configurable via the Interrupt Enable Register (IER), and status is reported in the Interrupt Status Register (ISR), allowing deterministic real-time response to RX/TX/error events without software arbitration overhead.
Is the SC16C654IA68,512 pin-compatible with older UARTs like the 16C454?
Yes - the SC16C654IA68,512 powers up functionally equivalent to the 16C454 and is pin-compatible with the ST16C654 and TL16C754 in PLCC68 packaging. Its register set maintains full backward compatibility, allowing drop-in replacement in existing designs while unlocking enhanced features (64-byte FIFO, IrDA, auto-flow control) through software configuration.
What are the FIFO trigger level options for the SC16C654IA68,512?
The SC16C654IA68,512 supports four selectable receive and transmit FIFO interrupt trigger levels: 1, 4, 8, or 14 bytes. These are configured independently per channel via the FIFO Control Register (FCR). The default post-reset trigger is 8 bytes for receive and 8 bytes for transmit - optimizing latency versus interrupt frequency for most industrial serial applications.
SC16C654IA68,512 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)
SC16C654IA68,512 FAQ
1.How can I place an order for SC16C654IA68,512 through Aetrix?
Please submit a Request for Quotation (RFQ) for SC16C654IA68,512 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 SC16C654IA68,512 reliable?
The price and inventory of SC16C654IA68,512 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC16C654IA68,512 is usually 5 days.
3.What payment methods are accepted for SC16C654IA68,512?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC16C654IA68,512 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC16C654IA68,512?
SC16C654IA68,512 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC16C654IA68,512 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 SC16C654IA68,512?
For technical support, including SC16C654IA68,512 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC16C654IA68,512 requirements.
6.How does Aetrix verify that SC16C654IA68,512 is sourced from the original manufacturer or authorized distributors?
All SC16C654IA68,512 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 SC16C654IA68,512 meets industry standards.
7.What is the process for return or replacement of SC16C654IA68,512?
All SC16C654IA68,512 units undergo pre-shipment inspection (PSI). If there is an issue with SC16C654IA68,512, 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 SC16C654IA68,512 part is unused and in its original packaging.
Return procedure for SC16C654IA68,512:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SC16C654IA68,512 Tags
-
SC16IS741AIPWJ
NXP Semiconductors
-
TL16C550CPTR
Texas Instruments
-
TL16C550CIPTR
Texas Instruments
-
SC16C752BIB48,128
NXP Semiconductors
-
ST16C2550CQ48-F
MaxLinear, Inc.
-
ST16C2550CJ44-F
MaxLinear, Inc.
-
ST16C2552CJ44-F
MaxLinear, Inc.
-
ST16C1550IQ48-F
MaxLinear, Inc.
-
ST16C2550IQ48-F
MaxLinear, Inc.
-
ST16C554DIQ64-F
MaxLinear, Inc.
-
ST16C554DCQ64-F
MaxLinear, Inc.
-
XR17V352IB113-F
MaxLinear, Inc.
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
