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NXP Semiconductors SCC68692C1A44,518
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- Part No.:
- SCC68692C1A44,518
- Manufacturer:
- NXP Semiconductors
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
SCC68692C1A44,518.pdf
- Description:
- IC DUART 1MBPS 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,448
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Product details
Overview
SCC68692C1A44,518 from NXP Semiconductors (formerly Philips) is a dual-channel CMOS-LSI universal asynchronous receiver/transmitter (DUART) with independent programmable baud rate control per channel, quadruple-receiver buffering, and integrated 16-bit counter/timer. It operates from a single +5 V supply, supports TTL-compatible bus interfacing (S68000 family), and delivers full-duplex serial communication for industrial control and legacy system upgrades.
For engineers reviewing the SCC68692C1A44,518 datasheet, SCC68692C1A44,518 pinout, SCC68692C1A44,518 application, or SCC68692C1A44,518 equivalent, key selection considerations include its 44-pin PLCC package, independent Rx/Tx baud rate selection (up to 115.2 kbaud), multidrop/wake-up mode support, on-chip crystal oscillator, and dual 6-bit input / 8-bit output multifunction ports.
Technical Context
The SCC68692C1A44,518 implements two fully independent UART channels (A and B), each with separate mode registers (MRA/CRB), status registers (SRA/SRB), and programmable data formats (5–8 data bits, odd/even/no parity, 1/1.5/2 stop bits). Each channel's receiver and transmitter can be clocked independently from the internal baud rate generator (18 fixed rates), programmable counter/timer, or external 1X/16X clocks.
Its timing architecture integrates a crystal oscillator (X1/CLK, X2), 16-bit counter/timer with Timer/Counter/Timeout modes, and four clock selectors enabling asymmetric channel operation - e.g., Channel A at 9600 baud (16X) while Channel B runs at 115.2 kbaud (1X) using separate external clocks. The interrupt system uses a single active-low INTRN output with eight maskable sources and optional discrete wire-ORable outputs via OP3–OP7.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | Dual full-duplex asynchronous receiver/transmitter (DUART) with independent channel control |
| Supply Voltage | +5 V ±10 % - enables direct integration into legacy 5 V microprocessor systems without level-shifting |
| Max Data Rate | 115.2 kbaud per channel - supports standard RS-232/RS-422 communication up to high-speed terminal links |
| Baud Rate Sources | 18 fixed rates (50–115.2 kbaud), counter/timer-derived non-standard rates, or external 1X/16X clocks - allows precise timing alignment in mixed-speed networks |
| Receiver Buffering | Quadruple-buffered RHR - reduces CPU interrupt overhead and prevents overrun in burst-mode reception |
| Operating Temperature | –40 °C to +85 °C - qualified for industrial environments including factory automation and transportation control |
| Package | 44-pin plastic leaded chip carrier (PLCC), SOT187-2 - surface-mount compatible with reflow assembly and robust mechanical retention |
Pinout & Package
SCC68692C1A44,518 is housed in a 44-pin PLCC (SOT187-2) package with 0.050″ lead pitch and index corner marking. Pin 1 is located at the index corner; pins are numbered counterclockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–6, 35–40, 42–44 | Address/Data/Control I/O | A1–A4 (register addressing), D0–D7 (bidirectional 3-state data bus), CSN/R/WN/RESETN/DTACKN/IACKN - enable S68000-compatible parallel bus interfacing with handshake control |
| 30–33, 10–11 | Serial I/O | RxDA/RxDB (CMOS-level receiver inputs), TxDA/TxDB (CMOS-level transmitter outputs) - support direct connection to line drivers or opto-isolators |
| 29–31, 12–15, 26–28 | Configurable Output Port | OP0–OP7 - individually set/resettable; programmable as RTS/CTS signals, TxRDY/RxRDY flags, or counter/timer outputs |
| 2, 4, 7, 36, 38–39 | Configurable Input Port | IP0–IP5 - general-purpose inputs with internal ~2.5 kΩ pull-ups; support change-of-state detection and external clock injection for Rx/Tx/C/T |
| 32–33 | Clock Interface | X1/CLK (crystal or external clock input), X2 (crystal output) - enables self-contained timing with 3.6864 MHz crystal or external clock source |
| 20, 40 | Power | GND (pin 20), VCC (pin 40) - decoupling required per CMOS LSI guidelines to maintain noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Independent Rx/Tx baud rate programming | Enables dual-speed channel operation - e.g., one channel at 1200 baud for sensor telemetry, another at 38.4 kbaud for host diagnostics |
| Multidrop (9-bit/wake-up) mode | Allows selective addressing of multiple DUARTs on a shared bus - critical for clustered terminal or point-of-sale systems |
| Flow control via RTS/CTS and FFULL interrupt | Prevents receiver overrun by disabling remote transmitters when local RHR buffer reaches capacity |
| 6-bit input port with change-of-state detection | Monitors up to four external signals (e.g., limit switches, emergency stops) with hardware-level edge capture and interrupt generation |
| 8-bit output port with individual bit control | Drives discrete indicators, relays, or peripheral enables without external latch logic - reduces BOM count |
| Power-down mode with <3 mA ICC | Extends uptime in battery-backed applications such as remote data loggers or portable test equipment |
Applications
| Industrial Machine Control | Legacy System Upgrade |
|---|---|
Use Scenario: PLC-to-HMI and PLC-to-servo drive communication over isolated RS-232/422 links in CNC machinery. IC Role / Device Role / Timing Role: Dual UART interface bridging 68000-based controller bus to serial peripherals; provides independent baud rate tuning for mismatched device speeds. Use Value: Eliminates need for two discrete UART ICs; quadruple buffering ensures no data loss during motion-critical command bursts. |
Use Scenario: Retrofitting aging telecom switchboards with modern microcontrollers while retaining original serial maintenance ports. IC Role / Device Role / Timing Role: Drop-in replacement for SCN68681 with identical register map and pinout - preserves firmware and PCB layout. Use Value: Maintains backward compatibility while adding wake-up mode and enhanced interrupt flexibility for remote diagnostics. |
| Point-of-Sale Terminal Hub | Transportation Telematics |
Use Scenario: Central terminal aggregating data from magnetic stripe readers, receipt printers, and PIN pads via separate serial channels. IC Role / Device Role / Timing Role: Dual-channel serial concentrator with RTS/CTS flow control per port - prevents buffer overflow during concurrent transactions. Use Value: Multifunction I/O ports directly drive status LEDs and detect card-insertion events without additional GPIO expanders. |
Use Scenario: Onboard telematics unit in rail or bus fleets communicating with GPS modules (9600 baud) and engine ECUs (19.2 kbaud) simultaneously. IC Role / Device Role / Timing Role: Asymmetric UART controller - Channel A handles GPS NMEA stream, Channel B manages J1708 diagnostics with independent clocking. Use Value: Single-chip solution avoids timing skew between channels; on-chip oscillator simplifies clock tree design in space-constrained enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual UART applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SCC68692E1A44 | Identical functionality and pinout; rated for –40 °C to +85 °C industrial temperature range vs. commercial (0 to +70 °C) for SCC68692C1A44,518 | Suitable for extended-temperature deployments where ambient exceeds 70 °C - e.g., under-hood automotive or outdoor kiosks | Select SCC68692E1A44 when operating outside commercial temperature limits; otherwise SCC68692C1A44,518 is functionally identical. |
| SCN68681D1A44 | Legacy predecessor with identical register set and pinout but lacks counter/timer, multidrop mode, and quadruple buffering; max baud rate 38.4 kbaud | Used only in legacy designs requiring exact drop-in replacement without feature upgrades | SCC68692C1A44,518 offers enhanced features and higher speed; SCN68681D1A44 is appropriate only for strict backward-compatibility constraints. |
Compared with SCN68681D1A44, the SCC68692C1A44,518 adds counter/timer, wake-up mode, and 115.2 kbaud capability - enabling new functionality without board redesign. Compared with SCC68692E1A44, it shares all electrical and functional specs but is qualified only to 0–70 °C, making it lower-cost for indoor, climate-controlled applications.
Availability
SCC68692C1A44,518 is available at Aetrix Electronics and suitable for industrial machine control, legacy system upgrade, point-of-sale terminal hub, and transportation telematics applications requiring stable component supply across long product lifecycles.
Supply support for SCC68692C1A44,518 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 markets, with roots in Philips' pioneering analog and mixed-signal IC development.
The SCC68692C1A44,518 belongs to NXP's legacy communications interface portfolio, designed specifically for reliable, low-power dual-channel serial communication in industrial control, telecom infrastructure, and embedded systems requiring long-term availability and deterministic timing.
FAQ
What is the maximum baud rate supported by the SCC68692C1A44,518?
The SCC68692C1A44,518 supports a maximum data transfer rate of 115.2 kbaud per channel. This is achieved using the internal baud rate generator with a 3.6864 MHz crystal or external clock. The device also permits non-standard user-defined rates derived from its 16-bit programmable counter/timer, allowing precise matching to proprietary protocols. The SCC68692C1A44,518 maintains signal integrity at this rate under industrial temperature conditions.
Does the SCC68692C1A44,518 require an external crystal or can it use an external clock?
Yes, the SCC68692C1A44,518 supports both configurations: a 3.6864 MHz crystal connected between X1/CLK and X2 pins, or an external clock signal applied to X1/CLK with X2 left unconnected or grounded. The device's internal crystal oscillator circuitry is disabled when an external clock is used. The SCC68692C1A44,518 accepts clock frequencies from 0 to 4 MHz, and timing specifications remain valid across this range.
How does the quadruple buffering in the SCC68692C1A44,518 improve system reliability?
The SCC68692C1A44,518 implements quadruple buffering in each receiver channel - meaning four receive holding registers (RHR) are available before overrun occurs. This significantly reduces interrupt service frequency and CPU load in high-throughput scenarios, such as burst-mode sensor data acquisition. It also provides time margin for software to process incoming characters before the next arrives, preventing data loss even during brief latency spikes. The SCC68692C1A44,518 leverages this to support real-time industrial protocols without dedicated DMA.
Can the SCC68692C1A44,518 operate in multidrop (9-bit/wake-up) mode?
Yes, the SCC68692C1A44,518 supports multidrop mode - also called 'wake-up' or '9-bit' mode - via programmable channel mode control. In this mode, the ninth bit distinguishes address frames from data frames, allowing one master to selectively activate specific slaves on a shared serial bus. This capability is implemented in hardware and requires no external logic. The SCC68692C1A44,518 uses its auxiliary control register (ACR) and mode registers to configure and manage wake-up sequences reliably.
What are the power supply requirements for the SCC68692C1A44,518?
The SCC68692C1A44,518 operates from a single +5 V supply with ±10 % tolerance (4.5 V to 5.5 V). Its typical operating current is ≤10 mA, dropping to ≤3.0 mA in power-down mode. Decoupling capacitors (0.1 µF ceramic + 10 µF tantalum) are required at VCC (pin 40) near the package. The SCC68692C1A44,518 is TTL-compatible and does not require negative or auxiliary voltage rails - simplifying power design in legacy 5 V systems.
SCC68692C1A44,518 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 44-LCC (J-Lead)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Features:
- Configurable GPIO, Internal Oscillator, Timer/Counter
- Number of Channels:
- 2, DUART
- FIFO's:
- -
- Protocol:
- -
- Data Rate (Max):
- 1Mbps
- Voltage - Supply:
- 5V
- With Auto Flow Control:
- Yes
- With IrDA Encoder/Decoder:
- -
- With False Start Bit Detection:
- Yes
- With Modem Control:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 44-PLCC (16.59x16.59)
SCC68692C1A44,518 FAQ
1.How can I place an order for SCC68692C1A44,518 through Aetrix?
Please submit a Request for Quotation (RFQ) for SCC68692C1A44,518 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 SCC68692C1A44,518 reliable?
The price and inventory of SCC68692C1A44,518 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SCC68692C1A44,518 is usually 5 days.
3.What payment methods are accepted for SCC68692C1A44,518?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SCC68692C1A44,518 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SCC68692C1A44,518?
SCC68692C1A44,518 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SCC68692C1A44,518 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 SCC68692C1A44,518?
For technical support, including SCC68692C1A44,518 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SCC68692C1A44,518 requirements.
6.How does Aetrix verify that SCC68692C1A44,518 is sourced from the original manufacturer or authorized distributors?
All SCC68692C1A44,518 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 SCC68692C1A44,518 meets industry standards.
7.What is the process for return or replacement of SCC68692C1A44,518?
All SCC68692C1A44,518 units undergo pre-shipment inspection (PSI). If there is an issue with SCC68692C1A44,518, 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 SCC68692C1A44,518 part is unused and in its original packaging.
Return procedure for SCC68692C1A44,518:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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