NXP Semiconductors SC26C92A1N,112

Overview

SC26C92A1N,112 from NXP Semiconductors (formerly Philips) is a dual-channel CMOS universal asynchronous receiver/transmitter (DUART) operating at +5V, featuring independent 8-character FIFOs per channel, programmable baud rates up to 230.4 kbaud, and integrated crystal oscillator for clock generation - used in industrial terminal controllers, legacy serial communication gateways, and multi-drop RS-232/RS-422 systems.

For engineers reviewing the SC26C92A1N,112 datasheet, SC26C92A1N,112 pinout, SC26C92A1N,112 application, or SC26C92A1N,112 equivalent, key selection criteria include dual UART channel independence, 44-pin PLCC package compatibility, receiver watchdog timer support, RTS/CTS flow control implementation, and power-down mode for low-power embedded host interfaces.

Technical Context

The SC26C92A1N,112 implements two fully independent UART channels (A and B), each with dedicated 8-byte transmit and receive FIFOs, separate baud rate generators, and configurable interrupt masking via IMR/ISR registers. Its timing architecture supports crystal (3.6864 MHz), external 1X/16X clock, or counter/timer-derived clocks - enabling asymmetric channel speeds for clustered terminal applications.

It integrates a 16-bit programmable counter/timer, 7-bit input port with change-of-state detection on IP0–IP3, and an 8-bit output port with individual bit set/reset and interrupt-mapped outputs (OP0–OP7). The device powers up emulating the SCC2692 register map while adding mode register 0, extended FIFO depth, and watch dog timers per receiver.

Key Specifications

Pinout & Package

SC26C92A1N,112 is housed in a 44-pin Plastic Leaded Chip Carrier (PLCC) package (SOT187-2), with gull-wing leads, 1.27 mm pitch, and index corner marking. Pin 1 is located at the index corner; pins are numbered counterclockwise.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SC26C92C1A, the SC26C92A1N,112 offers extended temperature operation and identical feature set; compared with SCN2681CP, it delivers robustness via deeper FIFOs, receiver watchdog, and flexible clocking - making it the preferred choice for new industrial designs requiring reliability and scalability.

Availability

SC26C92A1N,112 is available at Aetrix Electronics and suitable for industrial terminal controllers, legacy protocol gateways, multi-drop terminal clusters, and embedded serial debug interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SC26C92A1N,112 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 - formed from the spin-off of Philips Semiconductors in 2006.

The SC26C92A1N,112 belongs to NXP's legacy communications interface product line, designed specifically for robust, long-lifecycle serial communication in industrial control, point-of-sale, and telecommunications infrastructure equipment.

FAQ

What is the maximum baud rate supported by SC26C92A1N,112?

The SC26C92A1N,112 supports a maximum baud rate of 230.4 kbaud in 16X mode using either its internal 27-rate table or counter/timer-derived clocks. This is achieved with a 3.6864 MHz crystal or external clock input. At this rate, the transmitter and receiver operate with 16X oversampling, ensuring reliable sampling of noisy serial lines in industrial settings. The SC26C92A1N,112 does not support rates beyond 230.4 kbaud.

Does SC26C92A1N,112 support hardware flow control?

Yes, SC26C92A1N,112 supports full hardware flow control via RTS/CTS signaling. OP0 and OP1 can be configured as active-low RTS outputs for Channels A and B respectively, while IP0 and IP1 serve as corresponding active-low CTS inputs. When enabled, the DUART automatically deasserts RTS when its receive FIFO reaches a programmable threshold, preventing buffer overrun. This functionality is implemented in silicon and requires no CPU intervention.

What package type is used for SC26C92A1N,112?

SC26C92A1N,112 uses a 44-pin Plastic Leaded Chip Carrier (PLCC) package, designated SOT187-2. It features gull-wing leads, 1.27 mm pitch, and an index corner for orientation. This package provides mechanical robustness and thermal performance suitable for industrial reflow processes and long-term reliability in vibration-prone environments - distinct from the 40-pin DIP (SC26C92A1N) and 44-pin PQFP (SC26C92A1B) variants.

Can SC26C92A1N,112 operate with an external clock instead of a crystal?

Yes, SC26C92A1N,112 can operate with an external clock applied to the X1/CLK pin, eliminating the need for a crystal. The device accepts frequencies from 0.1 MHz to 8 MHz, with 3.6864 MHz recommended for standard baud rate generation. When using an external clock, X2 must be left unconnected. The SC26C92A1N,112's internal oscillator circuitry is bypassed, and all timing-including baud rate generation and counter/timer-is derived directly from the external source.

How does the receiver watchdog timer function in SC26C92A1N,112?

The SC26C92A1N,112 includes a dedicated watchdog timer for each receiver channel that triggers when no valid start bit is detected for a programmable duration - typically used to detect broken connections or line faults. Upon timeout, it sets the corresponding RxC timeout bit in the status register and can assert an interrupt via INTRN or OP4/OP5. This feature operates independently of CPU polling and enables autonomous recovery in unattended systems - a key differentiator from earlier UARTs like the SCN2681.