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NXP Semiconductors SCC68692E1A44,512
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- Part No.:
- SCC68692E1A44,512
- Manufacturer:
- NXP Semiconductors
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
SCC68692E1A44,512.pdf
- Description:
- IC DUART 1MBPS 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,727
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Product details
Overview
SCC68692E1A44,512 from NXP Semiconductors (formerly Philips Semiconductors) is a dual-channel CMOS-LSI universal asynchronous receiver/transmitter (DUART) in 44-pin PLCC package, operating at +5 V, supporting independent programmable baud rates up to 115.2 kbaud per channel, quadruple-buffered receivers, and TTL-compatible bus interface for S68000-family microprocessors. It enables full-duplex serial communication in industrial terminal controllers and legacy embedded systems.
For engineers reviewing the SCC68692E1A44,512 datasheet, SCC68692E1A44,512 pinout, SCC68692E1A44,512 application, or SCC68692E1A44,512 equivalent, key selection considerations include independent Rx/Tx baud rate programming, multidrop wake-up mode support, on-chip crystal oscillator, 6-bit input port with change-of-state detection, and open-drain interrupt-capable output port configuration.
Technical Context
The SCC68692E1A44,512 integrates two independent UART channels sharing a common 16-bit programmable counter/timer and dual-clock selector architecture, enabling asymmetric data rates (e.g., Channel A at 9600 baud, Channel B at 115.2 kbaud). Each channel supports 5–8 data bits, odd/even/no/force parity, and 1/1.5/2 stop bits programmable in 1/16-bit increments.
Its timing subsystem combines an on-chip crystal oscillator (3.6864 MHz nominal), baud rate generator with 22 fixed rates, and external 1X/16X clock inputs via dedicated IP pins (IP2–IP5). The interrupt system delivers eight maskable conditions through a single active-low open-drain INTRN output, with optional discrete wire-ORable outputs on OP3–OP7.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Baud Rates | 22 fixed rates (50–115.2 kbaud); non-standard user-defined rates via 16-bit counter/timer; external 1X/16X clock support |
| Data Format | 5–8 data bits, odd/even/no/force parity, 1/1.5/2 stop bits - programmable per channel in 1/16-bit increments |
| Receiver Buffering | Quadruple-buffered RHR per channel - reduces CPU interrupt overhead and prevents overrun in high-throughput polled systems |
| Input Port | 6-bit multipurpose input port with change-of-state detection on IP0–IP3 - enables hardware-triggered event capture without polling |
| Output Port | 8-bit multipurpose output port with individual bit set/reset and configurable as status/interrupt signals (e.g., TxRDYAN, RxRDYBN) |
| Power Supply | +5 V ±10 % - compatible with legacy TTL logic families and industrial 5 V rails; 10 mA typical ICC in operating mode |
| Temperature Range | –40 °C to +85 °C - qualified for industrial environments including factory automation and point-of-sale terminals |
Pinout & Package
SCC68692E1A44,512 is housed in a 44-pin plastic leaded chip carrier (PLCC) package (SOT187-2), 16.5 mm × 16.5 mm body, 1.27 mm pitch, with index corner marking. Pin 1 is located at the index corner; pin numbering proceeds counterclockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1,2,5,6 (A1–A4) | Address Inputs | Select internal registers/ports during CPU read/write cycles; decode 16 addresses including THR, RHR, CSR, IMR, ISR, OPR, IPCR |
| 8 (R/WN) | Read/Write Control | Active-HIGH = read cycle; LOW = write cycle; synchronizes data transfer with CSN and DTACKN |
| 9 (DTACKN) | Data Transfer Acknowledge | 3-State active-LOW output confirming valid read/write completion; required for synchronous bus interfacing with 68000-family CPUs |
| 21 (INTRN) | Interrupt Request | Open-drain active-LOW output asserting on any of eight maskable events (RxRDY, TxRDY, break, C/T, etc.) |
| 30 (TxDA), 11 (TxDB) | Transmitter Outputs | Channel A/B serial data outputs; held HIGH ("mark") when idle, disabled, or in loopback; LSB-first transmission |
| 31 (RxDA), 10 (RxDB) | Receiver Inputs | Channel A/B serial data inputs; detect start-bit falling edge; sample at 16X clock center for noise immunity |
| 32 (X1/CLK), 33 (X2) | Clock Interface | Crystal oscillator inputs (3.6864 MHz nominal) or external clock source; X1 accepts TTL/CMOS levels; X2 unbuffered |
| 34 (RESETN) | Hardware Reset | Active-LOW signal clearing all control/status registers, halting C/T, and initializing IVR to 0xF; resets MR pointer to MR1 |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent UART channels | Enables simultaneous RS-232/RS-422 links to host and peripheral without external multiplexing or CPU arbitration |
| Programmable multidrop mode | Supports 9-bit address/data framing and automatic wake-up - essential for clustered terminal networks with shared bus topology |
| Receiver timeout detection | Monitors inter-character gaps to flag stalled transmissions - critical for protocol-level error recovery in Modbus RTU or custom fieldbus stacks |
| On-chip crystal oscillator | Eliminates external timing components; reduces BOM count and layout area while maintaining ±0.5 % baud accuracy at 3.6864 MHz |
| Power-down mode | Reduces ICC to ≤2.0 mA (CMOS inputs) - extends uptime in battery-backed industrial gateways and remote I/O modules |
| False start-bit rejection | Discards spurious transitions before valid start-bit sampling - improves reliability in electrically noisy factory floor environments |
Applications
| Industrial Terminal Controller | Legacy POS System |
|---|---|
Use Scenario: A DIN-rail mounted terminal controller manages serial communication with multiple PLCs and HMIs over isolated RS-422 links. IC Role / Device Role / Timing Role: SCC68692E1A44,512 serves as dual-channel UART bridge between 68000-based CPU and differential transceivers; provides independent 19.2 kbaud (Channel A) and 38.4 kbaud (Channel B) operation. Use Value: Quadruple buffering prevents data loss during CPU context switches; multidrop mode enables address-based polling of 32+ slave devices on shared bus. |
Use Scenario: A cash register system interfaces barcode scanner (RS-232), receipt printer (RS-232), and pole display (TTL-level serial) simultaneously. IC Role / Device Role / Timing Role: SCC68692E1A44,512 acts as central serial I/O hub; Channel A handles scanner at 9600 baud, Channel B drives printer at 115.2 kbaud with 1-stop-bit format. Use Value: Independent baud rate and data format per channel eliminates need for external level shifters or protocol converters; 6-bit input port monitors scanner trigger and drawer switch status. |
| Factory Automation Gateway | Military Communications Module |
Use Scenario: An embedded gateway translates Modbus RTU over RS-485 to Ethernet, requiring robust serial framing and break detection. IC Role / Device Role / Timing Role: SCC68692E1A44,512 implements Modbus ASCII/RTU framing on Channel A; Channel B handles diagnostics via local console port. Use Value: Line break generation/detection and receiver timeout mode enable strict Modbus inter-frame gap enforcement; industrial temp range ensures operation in unconditioned control cabinets. |
Use Scenario: A ruggedized comms module in vehicle-mounted radio equipment requires EMI-tolerant serial I/O with deterministic reset behavior. IC Role / Device Role / Timing Role: SCC68692E1A44,512 provides dual UART interface to crypto processor and front-panel keypad; uses crystal oscillator for stable timing under vibration. Use Value: Hardware RESETN guarantees known state after power-on or brownout; false start-bit rejection maintains link integrity in high-noise RF environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual UART applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SCC68681B1A44 | Single-channel UART; no counter/timer; no multidrop mode; 40-pin DIP only; lacks quadruple buffering | Not suitable for dual-link or wake-up applications; limited to basic point-to-point links | Select only if single-channel operation suffices and PLCC packaging is not required |
| MAX3100CEE+ | SPI interface instead of parallel bus; 3.3 V only; integrated transceiver drivers; no crystal oscillator; smaller 16-pin QSOP | Requires SPI master CPU; incompatible with 68000 bus; suited for low-power portable designs | Choose for modern 3.3 V microcontrollers with SPI; avoid when legacy parallel bus or crystal timing is mandatory |
Compared with SCC68692E1A44,512, SCC68681B1A44 lacks dual-channel independence and advanced timing features, while MAX3100CEE+ trades parallel bus compatibility and crystal integration for SPI simplicity and lower voltage operation - making SCC68692E1A44,512 uniquely suited for industrial 5 V, bus-mapped, crystal-referenced dual-UART designs.
Availability
SCC68692E1A44,512 is available at Aetrix Electronics and suitable for industrial terminal controllers, legacy point-of-sale systems, factory automation gateways, and military communications modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SCC68692E1A44,512 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 specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with roots in Philips' pioneering analog and mixed-signal IC development.
The SCC68692E1A44,512 belongs to NXP's legacy communications interface product line, designed specifically for robust, bus-compatible serial I/O in industrial control and embedded systems requiring long-term availability and deterministic timing.
FAQ
What is the maximum supported baud rate for SCC68692E1A44,512?
The SCC68692E1A44,512 supports up to 115.2 kbaud per channel using its internal baud rate generator with a 3.6864 MHz crystal. Non-standard rates up to 115.2 kbaud are achievable via the 16-bit counter/timer or external 1X/16X clock inputs. The device does not support rates beyond this limit, and actual throughput depends on CPU interface timing and receiver buffer management.
Does SCC68692E1A44,512 include an on-chip crystal oscillator?
Yes, the SCC68692E1A44,512 integrates a crystal oscillator circuit between pins X1/CLK and X2. A 3.6864 MHz crystal is recommended for standard baud rate generation. When used, the oscillator drives the baud rate generator, counter/timer, and internal logic - eliminating the need for external clock sources in most applications.
How many interrupt sources does SCC68692E1A44,512 support?
The SCC68692E1A44,512 supports eight maskable interrupt sources: RxRDY/FFULL, TxRDY, break, end-of-break, C/T, input port change, and two channel-specific status interrupts. These are consolidated into a single active-low open-drain INTRN output, but OP3–OP7 can be configured as six additional discrete interrupt outputs for prioritized handling.
What is the function of the 6-bit input port on SCC68692E1A44,512?
The 6-bit input port (IP0–IP5) on SCC68692E1A44,512 serves dual roles: general-purpose digital inputs or dedicated auxiliary functions like RTS/CTS handshaking, external clock inputs (RxCA, TxCB), or counter/timer clock sources. Four pins (IP0–IP3) feature change-of-state detection, allowing hardware-triggered interrupts without CPU polling.
Is SCC68692E1A44,512 compatible with the Motorola 68000 microprocessor bus?
Yes, the SCC68692E1A44,512 is explicitly designed for S68000-family bus compatibility. Its address decoding (A1–A4), R/WN control, DTACKN handshake, and 3-state data bus (D0–D7) align with 68000 timing requirements. The device supports both polled and interrupt-driven operation and interfaces directly without glue logic in systems using 68000, 68020, or compatible CPUs.
SCC68692E1A44,512 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 44-LCC (J-Lead)
- Series:
- -
- Packaging:
- Tube
- 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)
SCC68692E1A44,512 FAQ
1.How can I place an order for SCC68692E1A44,512 through Aetrix?
Please submit a Request for Quotation (RFQ) for SCC68692E1A44,512 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 SCC68692E1A44,512 reliable?
The price and inventory of SCC68692E1A44,512 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SCC68692E1A44,512 is usually 5 days.
3.What payment methods are accepted for SCC68692E1A44,512?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SCC68692E1A44,512 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SCC68692E1A44,512?
SCC68692E1A44,512 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SCC68692E1A44,512 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 SCC68692E1A44,512?
For technical support, including SCC68692E1A44,512 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SCC68692E1A44,512 requirements.
6.How does Aetrix verify that SCC68692E1A44,512 is sourced from the original manufacturer or authorized distributors?
All SCC68692E1A44,512 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 SCC68692E1A44,512 meets industry standards.
7.What is the process for return or replacement of SCC68692E1A44,512?
All SCC68692E1A44,512 units undergo pre-shipment inspection (PSI). If there is an issue with SCC68692E1A44,512, 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 SCC68692E1A44,512 part is unused and in its original packaging.
Return procedure for SCC68692E1A44,512:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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