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NXP Semiconductors SCC68692E1A44,518
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- Part No.:
- SCC68692E1A44,518
- Manufacturer:
- NXP Semiconductors
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
SCC68692E1A44,518.pdf
- Description:
- IC DUART 1MBPS 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,786
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Product details
Overview
SCC68692E1A44,518 from NXP Semiconductors (formerly Philips) is an industrial-grade dual universal asynchronous receiver/transmitter (DUART) IC in 44-pin PLCC package, supporting two independent full-duplex serial channels with quadruple-buffered receivers, programmable 5–8-bit data format, 1–2 stop bits, and parity options. It operates from a single +5 V supply and integrates on-chip crystal oscillator, 16-bit counter/timer, and multipurpose 6-bit input/8-bit output ports for embedded control applications.
For engineers reviewing the SCC68692E1A44,518 datasheet, SCC68692E1A44,518 pinout, SCC68692E1A44,518 application, or SCC68692E1A44,518 equivalent, key selection considerations include independent baud rate programming per channel (up to 115.2 kbaud), multidrop/wake-up mode support, false start bit detection, receiver timeout capability, and TTL-compatible bus interface with S68000 family alignment.
Technical Context
The SCC68692E1A44,518 implements two independent UART channels sharing a common 3.6864 MHz crystal-based timing source, with separate baud rate generators and clock selectors enabling asymmetric receiver/transmitter speeds - critical for clustered terminal systems. Each channel supports Normal, Automatic Echo, Local/Remote Loopback, and Multidrop (9-bit) modes via software-configurable mode registers.
Its interrupt architecture features a single active-low open-drain INTRN output with eight maskable sources, plus optional discrete interrupt outputs on OP3–OP7, while the 6-bit input port includes change-of-state detection on IP0–IP3 and internal ~2.5 µA pull-ups. The 8-bit output port supports individual bit set/reset and configurable function assignment (e.g., RTS, TxRDY, RxRDY, C/T output).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | +5 V ±10 % - enables direct integration into legacy 5 V microprocessor systems without level-shifting. |
| Operating Temperature | –40 °C to +85 °C - qualified for industrial environments including factory automation and telecom infrastructure. |
| Max Data Rate | 115.2 kbaud - supports standard RS-232/RS-422 communication links with 16× oversampling for noise immunity. |
| Baud Rate Sources | 22 fixed rates + user-defined via 16-bit counter/timer or external 1X/16X clock - allows non-standard protocol timing and precise synchronization. |
| Receiver Buffering | Quadruple-buffered RHR - reduces CPU interrupt overhead and prevents overrun in high-throughput polled or interrupt-driven systems. |
| Interrupt Architecture | Single INTRN with 8 maskable sources + up to 6 wire-ORable outputs on OP3–OP7 - simplifies priority handling and system-level interrupt routing. |
| Input/Output Ports | 6-bit input port with change-of-state detection + 8-bit output port with individual bit control - provides hardware-assisted I/O expansion without external logic. |
Pinout & Package
SCC68692E1A44,518 is housed in a 44-pin Plastic Leaded Chip Carrier (PLCC) package (SOT187-2), measuring 16.5 mm × 16.5 mm with J-lead geometry, compatible with standard PLCC sockets and reflow soldering profiles for industrial PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D0–D7 | Data Bus I/O | Bidirectional 3-state 8-bit parallel interface to CPU; D0 = LSB - matches S68000 bus timing and drive strength. |
| A1–A4 | Address Inputs | Selects internal registers (RHR, THR, SR, CR, etc.) and I/O ports; no A0 required due to even-address mapping. |
| R/WN | Read/Write Control | Active-HIGH read / active-LOW write - synchronous with CSN and DTACKN for clean 68k-style bus cycles. |
| CSN | Chip Select | Active-LOW enable - places D0–D7 in high-impedance state when deasserted, enabling multi-peripheral bus sharing. |
| RxDA / RxDB | Channel A/B Serial Input | CMOS-level async inputs sampled at 16× baud rate - accept standard TTL/RS-232 (with line driver) signals directly. |
| TxDA / TxDB | Channel A/B Serial Output | CMOS-level outputs held HIGH (mark) when idle - compatible with MC1488/DS26LS32 line drivers. |
| INTRN | Interrupt Request | Open-drain active-LOW - requires external pull-up; asserts on any enabled interrupt condition (RxRDY, TxRDY, break, etc.). |
| IACKN | Interrupt Acknowledge | Active-LOW input - triggers vector read cycle and DTACKN assertion to complete interrupt servicing. |
| X1/CLK & X2 | Clock Input/Output | Crystal terminals for 3.6864 MHz fundamental-mode crystal; X2 may be left unconnected if external clock used on X1/CLK. |
| RESETN | Hardware Reset | Active-LOW asynchronous reset - clears all registers, stops counter/timer, and forces Tx outputs to mark state. |
| OP0–OP7 | Configurable Outputs | Programmable as general-purpose I/O or functional signals (RTS, TxRDY, RxRDY, C/T output) - OP3–OP7 support open-drain interrupt mode. |
| IP0–IP5 | Configurable Inputs | General-purpose or functional inputs (CTS, Rx/Tx clocks, C/T clock); internal ~2.5 µA pull-ups eliminate need for external resistors. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent UART channels | Enables simultaneous RS-232/422 links to two peripherals (e.g., modem + printer) without CPU time-slicing or external multiplexing. |
| Quadruple-buffered receiver | Reduces interrupt frequency by 75 % vs. single-buffer designs - critical for real-time response in interrupt-driven firmware. |
| Independent Rx/Tx baud rate selection | Supports asymmetric protocols like IBM 3270 cluster controllers where receive speed differs from transmit speed. |
| Multidrop (9-bit) wake-up mode | Allows one master to selectively activate specific slaves in a shared bus topology using address bits - saves power and avoids collisions. |
| On-chip 16-bit counter/timer | Provides precise timing for custom baud rates, pulse generation, or receiver timeout detection - eliminates need for external timer IC. |
| Flow control via RTS/CTS handshake | Hardware-controlled transmitter disable on Rx buffer full - prevents data loss in bursty traffic without software polling. |
Applications
| Industrial Terminal Controller | Legacy System Retrofit |
|---|---|
Use Scenario: Embedded controller managing multiple serial devices (PLC, HMI, barcode scanner) in a factory floor cabinet with limited board space and strict EMI requirements. IC Role / Device Role / Timing Role: Dual-channel UART providing isolated, buffered serial interfaces with hardware flow control and receiver timeout - acts as central serial hub between 68k-based CPU and field devices. Use Value: Quadruple buffering and independent baud rate control eliminate dropped characters during high-speed barcode scanning bursts while maintaining compatibility with legacy 9600 bps PLC links. |
Use Scenario: Upgrading a 1990s medical instrument with aging SCN68681 DUARTs to extend service life without redesigning PCB layout or firmware. IC Role / Device Role / Timing Role: Pin- and register-compatible replacement for SCN68681 in S68000 bus systems - retains identical address map, interrupt behavior, and timing margins. Use Value: Direct drop-in replacement with extended temperature range (–40 °C to +85 °C) and lower power consumption improves reliability in fanless enclosures. |
| Telecom Line Card | Point-of-Sale Kiosk |
Use Scenario: Modular T1/E1 line card requiring two independent serial management ports for out-of-band diagnostics and firmware updates over RS-232. IC Role / Device Role / Timing Role: Dual UART with crystal oscillator and multidrop mode - handles simultaneous console access and remote provisioning via dedicated serial channels. Use Value: On-chip crystal eliminates external oscillator components; multidrop mode enables secure, addressed command injection without interfering with primary data path. |
Use Scenario: Retail kiosk integrating receipt printer, magnetic stripe reader, and cash drawer - all requiring independent serial handshaking and error detection. IC Role / Device Role / Timing Role: Central serial interface IC with RTS/CTS support and false start bit detection - manages concurrent peripheral transactions under Linux-based OS with minimal driver overhead. Use Value: Hardware flow control prevents print spooler overflow; false start bit rejection improves MSR data integrity in electrically noisy retail environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual UART applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SCC68681C1A44 | Predecessor device with identical pinout and register set but no receiver timeout mode or enhanced multidrop features. | Lacks receiver timeout and advanced wake-up functionality - suitable only for basic full-duplex links without burst traffic monitoring. | Select only if legacy design validation requires exact historical part equivalence and newer features are unused. |
| TL16C550CPTR | Single-channel 16550-compatible UART with 16-byte FIFO; requires two units for dual-channel operation and external glue logic. | No native dual-channel integration or shared counter/timer - increases BOM count, PCB area, and interrupt latency vs. SCC68692E1A44,518. | Choose when migrating to industry-standard 16550 software drivers is prioritized over hardware consolidation and legacy bus compatibility. |
Compared with SCC68692E1A44,518, the SCC68681C1A44 offers identical footprint and register compatibility but omits receiver timeout and enhanced multidrop control, while the TL16C550CPTR delivers deeper FIFO buffering per channel yet demands duplicated hardware and lacks integrated I/O ports or counter/timer - making SCC68692E1A44,518 optimal for space-constrained, bus-integrated industrial designs.
Availability
SCC68692E1A44,518 is available at Aetrix Electronics and suitable for industrial automation, telecom infrastructure, and legacy system retrofit applications requiring stable component supply, long-term lifecycle assurance, and guaranteed traceable sourcing.
Supply support for SCC68692E1A44,518 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 deep heritage in legacy communications ICs from its Philips acquisition.
The SCC68692E1A44,518 belongs to NXP's industrial communications product line, designed specifically for robust, long-lifecycle serial interface needs in factory automation, point-of-sale, and telecom equipment where bus compatibility and hardware-assisted protocol handling are essential.
FAQ
What is the maximum baud rate supported by the SCC68692E1A44,518?
The SCC68692E1A44,518 supports a maximum baud rate of 115.2 kbaud using its internal baud rate generator with a 3.6864 MHz crystal. It also accepts externally derived 1X or 16X clocks up to 2 MHz (1X) or 32 MHz (16X), enabling non-standard rates beyond the 22 predefined values - all while maintaining full receiver sampling integrity and false start bit rejection as specified in the SCC68692E1A44,518 datasheet.
Does the SCC68692E1A44,518 require an external crystal oscillator?
No, the SCC68692E1A44,518 includes an on-chip crystal oscillator and can operate directly with a 3.6864 MHz fundamental-mode crystal connected between X1/CLK and X2 pins. Alternatively, it accepts an external CMOS-level clock signal applied to X1/CLK, allowing use in systems where a precision clock source is already available - eliminating the need for external oscillator circuitry in either case for the SCC68692E1A44,518.
How does the SCC68692E1A44,518 handle receiver overrun protection?
The SCC68692E1A44,518 prevents receiver overrun through quadruple buffering of the Receive Holding Register (RHR), combined with hardware flow control via RTS/CTS signaling and receiver timeout detection. When the RHR fills, the device can assert FFULLAN/FFULLBN on OP4/OP5 to disable a remote transmitter, while the timeout mode detects pauses in incoming data - all managed autonomously without CPU intervention for the SCC68692E1A44,518.
Is the SCC68692E1A44,518 pin-compatible with the SCN68681?
Yes, the SCC68692E1A44,518 is fully pin-compatible and register-compatible with the SCN68681 across all package variants, including the 44-pin PLCC. This allows direct replacement in existing designs without PCB or firmware changes, while adding enhancements such as receiver timeout mode, improved multidrop wake-up, and updated DC/AC specifications - making the SCC68692E1A44,518 a seamless upgrade path.
What power supply requirements does the SCC68692E1A44,518 have?
The SCC68692E1A44,518 operates from a single +5 V supply with ±10 % tolerance (4.5 V to 5.5 V), consuming up to 10 mA in active mode and ≤2.0 mA in power-down mode. Its TTL-compatible I/O structure eliminates level-shifting needs, and internal ESD protection plus 100 kΩ typical input pull-ups simplify system design - all verified per the official SCC68692E1A44,518 datasheet specifications.
SCC68692E1A44,518 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)
SCC68692E1A44,518 FAQ
1.How can I place an order for SCC68692E1A44,518 through Aetrix?
Please submit a Request for Quotation (RFQ) for SCC68692E1A44,518 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 SCC68692E1A44,518 reliable?
The price and inventory of SCC68692E1A44,518 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SCC68692E1A44,518 is usually 5 days.
3.What payment methods are accepted for SCC68692E1A44,518?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SCC68692E1A44,518 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SCC68692E1A44,518?
SCC68692E1A44,518 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SCC68692E1A44,518 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 SCC68692E1A44,518?
For technical support, including SCC68692E1A44,518 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SCC68692E1A44,518 requirements.
6.How does Aetrix verify that SCC68692E1A44,518 is sourced from the original manufacturer or authorized distributors?
All SCC68692E1A44,518 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 SCC68692E1A44,518 meets industry standards.
7.What is the process for return or replacement of SCC68692E1A44,518?
All SCC68692E1A44,518 units undergo pre-shipment inspection (PSI). If there is an issue with SCC68692E1A44,518, 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 SCC68692E1A44,518 part is unused and in its original packaging.
Return procedure for SCC68692E1A44,518:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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