NXP Semiconductors SCC2692AE1B44,557

Overview

SCC2692AE1B44,557 from NXP Semiconductors (formerly Philips) is a dual-channel CMOS-LSI asynchronous receiver/transmitter (DUART) with independent programmable baud rate control per channel, quadruple receiver buffering, and TTL-compatible +5V operation. It supports 22 fixed baud rates up to 115.2 kbaud, external 1X/16X clock inputs, and operates across -40°C to +85°C for industrial applications including legacy serial terminal interfaces and multidrop RS-232/422 systems.

For engineers reviewing the SCC2692AE1B44,557 datasheet, SCC2692AE1B44,557 pinout, SCC2692AE1B44,557 application, or SCC2692AE1B44,557 equivalent, key selection criteria include independent Rx/Tx clock sourcing, multidrop wake-up mode support, 44-pin PQFP package compatibility, and integrated counter/timer with timeout detection for flow-controlled serial links.

Technical Context

The SCC2692AE1B44,557 implements two fully independent UART channels sharing a common 8-bit bidirectional data bus, address decoding (A0–A3), and interrupt logic. Each channel features separate mode registers (MRA/MRB), control registers (CRA/CRB), and status registers (SRA/SRB), enabling simultaneous full-duplex operation with distinct data formats (5–8 data bits, odd/even/no parity, 1/1.5/2 stop bits).

Its timing subsystem integrates an on-chip crystal oscillator (X1/CLK, X2), a 16-bit programmable counter/timer, and four clock selectors that route either BRG output, C/T output, or external 1X/16X clocks to individual Rx/Tx blocks - enabling asymmetric channel speeds, such as 9600 baud on Channel A and 19.2 kbaud on Channel B in clustered terminal systems.

Key Specifications

Pinout & Package

SCC2692AE1B44,557 is housed in a 44-pin PQFP (SOT307-2) with 0.8 mm lead pitch and 10 × 10 mm body. Pin 1 is index corner; pins are numbered counterclockwise starting from top-left.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual asynchronous receiver/transmitter applications.

Compared with SCC2691AE1B44 and TL16C550CPTR, the SCC2692AE1B44,557 uniquely combines dual independent UARTs, hardware multidrop wake-up, and a programmable counter/timer in a single 44-pin PQFP - making it irreplaceable for deterministic serial architectures requiring synchronized channel timing and low-latency interrupt response.

Availability

SCC2692AE1B44,557 is available at Aetrix Electronics and suitable for industrial terminal interfaces, legacy POS systems, and embedded telemetry gateways requiring stable component supply, long-lifecycle support, and guaranteed industrial temperature compliance.

Supply support for SCC2692AE1B44,557 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, with roots in Philips' pioneering analog and mixed-signal IC development.

The SCC2692AE1B44,557 belongs to NXP's legacy communications interface portfolio, designed specifically for robust, low-power dual-channel serial communication in mission-critical industrial control and instrumentation systems.

FAQ

What is the maximum baud rate supported by the SCC2692AE1B44,557?

The SCC2692AE1B44,557 supports up to 115.2 kbaud using its internal baud rate generator with a 3.6864 MHz crystal. When using external 16X clock inputs, the maximum achievable rate is 125 kB/sec (1 Mbit/sec at 1X sampling), limited by AC timing parameters like tRXS and tTXD. The device does not support rates beyond this due to internal shift register and sampling constraints documented in the 1998 specification.

Does the SCC2692AE1B44,557 support automatic hardware flow control?

Yes, the SCC2692AE1B44,557 supports automatic RTS/CTS flow control. OP0 and OP1 can be configured as active-Low request-to-send outputs, while IP0 and IP1 serve as clear-to-send inputs. When CTS is enabled in the command register, transmission halts if CTS goes High mid-character and resumes only after CTS returns Low - all handled autonomously without CPU intervention.

Can the SCC2692AE1B44,557 operate without an external crystal?

Yes, the SCC2692AE1B44,557 can operate using an external clock applied to the X1/CLK pin instead of a crystal. The X2 pin may be left unconnected or grounded. The device requires a stable clock input between 0 and 4 MHz; for standard baud rates, a 3.6864 MHz source is recommended. Crystal oscillator circuitry is disabled when external clock mode is selected.

What is the function of the counter/timer in the SCC2692AE1B44,557?

The SCC2692AE1B44,557 includes a 16-bit programmable counter/timer used for three purposes: generating precise 16X baud clocks for non-standard rates, producing periodic interrupts (timer mode), or detecting receiver idle periods (timeout mode). Its output can drive OP2 or OP3, or synchronize with Rx/Tx clocks - enabling adaptive serial link behavior without external components.

Is the SCC2692AE1B44,557 pin-compatible with the SCN2681?

Yes, the SCC2692AE1B44,557 is explicitly stated in its datasheet to be compatible with the SCN2681. Both devices share identical pinouts, register maps, and electrical characteristics in the 44-pin PQFP package. Firmware written for SCN2681 operates without modification on SCC2692AE1B44,557, though the latter adds enhanced features like receiver timeout and improved interrupt flexibility.