NXP Semiconductors SCC2692AC1N28,129

Overview

SCC2692AC1N28,129 from NXP Semiconductors (formerly Philips) is a dual-channel CMOS-LSI asynchronous receiver/transmitter (DUART) in a 28-pin DIP package. It provides two independent full-duplex UART channels with quadruple-buffered receivers, programmable 5–8-bit data format, 1–2 stop bits, odd/even/no parity, and independent baud rate selection per channel - supporting up to 115.2 kbaud. It interfaces directly with 8-bit microprocessors via TTL-compatible parallel bus and is used in industrial terminal systems, legacy serial communication controllers, and multidrop RS-232/RS-422 subsystems.

For engineers reviewing the SCC2692AC1N28,129 datasheet, SCC2692AC1N28,129 pinout, SCC2692AC1N28,129 application, or SCC2692AC1N28,129 equivalent, key selection considerations include its 28-pin DIP footprint, independent Rx/Tx clock sourcing (crystal, counter/timer, or external 1X/16X), receiver timeout mode, automatic wake-up for multidrop, and dual 7-bit input / 8-bit output multifunction ports usable as status/interrupt signals or general-purpose I/O.

Technical Context

The SCC2692AC1N28,129 implements two fully independent UART channels sharing a single 16-bit programmable counter/timer and one on-chip crystal oscillator (3.6864 MHz nominal). Each channel supports separate configuration of data format, baud rate source (22 fixed rates, counter/timer-derived, or external clock), and operational mode (normal, echo, local/remote loopback, or multidrop/wake-up).

Its interrupt architecture features a single active-low open-drain INTRN output with eight maskable sources plus six wire-ORable discrete interrupt outputs assignable to OP3–OP7. The 7-bit input port includes change-of-state detection on IP0–IP3 and internal ~100 kΩ pull-ups; the 8-bit output port supports individual bit set/reset and configurable function assignment via OPCR and mode registers.

Key Specifications

Pinout & Package

SCC2692AC1N28,129 uses a 28-pin plastic dual in-line package (DIP), SOT117-1, with 0.3-inch body width and standard 0.1-inch pin pitch. Pin 1 is index corner; pins 14–28 are on right side, pins 1–13 on left side (viewed top-down, notch up).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual UART applications.

Compared with SCN2681ACZ, SCC2692AC1N28,129 adds critical features like independent Rx/Tx clocking and multidrop wake-up; versus TL16C2550IPN, it trades FIFO depth and modern interfaces for proven 5V reliability and simpler register mapping in cost-sensitive industrial retrofits.

Availability

SCC2692AC1N28,129 is available at Aetrix Electronics and suitable for industrial serial terminal controllers, legacy POS system interfaces, and RS-422 multidrop data loggers requiring stable component supply across extended production lifecycles.

Supply support for SCC2692AC1N28,129 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. Formerly Philips Semiconductors, it maintains legacy product support with full documentation and long-term supply commitments.

The SCC2692AC1N28,129 belongs to NXP's legacy communications IC portfolio, designed specifically for robust, low-cost serial interface expansion in 5V microprocessor systems where pin compatibility, deterministic timing, and field-proven reliability are prioritized over high-speed throughput.

FAQ

What is the maximum supported baud rate for SCC2692AC1N28,129?

The SCC2692AC1N28,129 supports a maximum baud rate of 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 programmable 16-bit counter/timer or external 1X/16X clock inputs. Actual achievable rate depends on clock source stability and system timing margins.

Does SCC2692AC1N28,129 support hardware flow control?

Yes, SCC2692AC1N28,129 supports hardware flow control via active-low CTS inputs (IP0/IP1) and RTS outputs (OP0/OP1). When CTS is asserted, transmission proceeds; if CTS goes high mid-transmission, the current character completes before TxDA/TxDB enters mark state. OP0/OP1 can be auto-deactivated after transmission completion under software control.

Can SCC2692AC1N28,129 operate with an external clock instead of a crystal?

Yes, SCC2692AC1N28,129 can accept an external clock signal on the X1/CLK pin (0–4 MHz), eliminating the need for a crystal. X2 may be left unconnected or grounded. External clock operation maintains full functionality including baud rate generation, counter/timer, and interrupt timing - verified across commercial temperature range.

What is the purpose of the 7-bit input port on SCC2692AC1N28,129?

The 7-bit input port (IP0–IP6) on SCC2692AC1N28,129 serves dual roles: general-purpose digital inputs or dedicated control signals (e.g., CTS, external clock inputs). Four pins (IP0–IP3) support change-of-state detection with interrupt capability. All inputs feature internal ~100 kΩ pull-up resistors, enabling direct connection to open-collector or switch-based controls without external components.

Is SCC2692AC1N28,129 compatible with the SCN2681?

Yes, SCC2692AC1N28,129 is explicitly stated as compatible with the SCN2681 in its Philips datasheet. It retains identical pinout, register map, and basic UART functionality while adding enhancements including independent Rx/Tx clocking, receiver timeout, multidrop wake-up, and expanded baud rate options - making it a functional upgrade path.