NXP Semiconductors SC28L202A1DGG,118

Overview

SC28L202A1DGG,118 from NXP Semiconductors (formerly Philips Semiconductors) is a dual universal asynchronous receiver/transmitter (DUART) IC supporting two independent full-duplex serial channels with programmable baud rates up to 1.5 Mbps, 16-byte FIFOs per channel, and Intel 80xxx/Motorola 68xxx bus interface compatibility. It operates from a single 5 V supply and targets legacy industrial control, point-of-sale terminals, and embedded communication gateways requiring robust RS-232/RS-422 interfacing.

For engineers reviewing the SC28L202A1DGG,118 datasheet, SC28L202A1DGG,118 pinout, SC28L202A1DGG,118 application, or SC28L202A1DGG,118 equivalent, key selection criteria include dual-channel UART timing independence, hardware flow control (RTS/CTS), interrupt arbitration for multi-master bus systems, and register-level support for Xon/Xoff, address recognition, and watchdog timer functions.

Technical Context

The SC28L202A1DGG,118 implements two fully independent UART cores sharing a common host bus interface, each with dedicated 16-byte receive and transmit FIFOs, programmable BRG clock dividers, and status/control registers. Its interrupt structure uses priority-based arbitration with bidirectional handshake signals (INT, DACKN, IACK) to resolve contention in shared-bus environments.

It supports both Intel-style (multiplexed AD bus) and Motorola-style (separate address/data) bus protocols via configuration pins, and includes dedicated registers for character recognition (Xon/Xoff, address), loopback diagnostics (local/remote), and enhanced operation status (EOS, SES), enabling deterministic serial protocol handling in real-time embedded systems.

Key Specifications

Pinout & Package

SC28L202A1DGG,118 is housed in a 64-pin LQFP (10 × 10 mm, 0.5 mm pitch) package with exposed thermal pad. Pin assignments are defined for both Intel and Motorola bus modes via MODE[1:0] configuration pins.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SC28L202A1DGG,118, the SC28L201A1DGG,118 offers half the channel count at lower cost and power, while the TL16C2550IPN provides functional parity for basic dual-UART use but omits critical features for deterministic industrial bus arbitration and protocol-aware diagnostics.

Availability

SC28L202A1DGG,118 is available at Aetrix Electronics and suitable for industrial PLC communication modules, legacy point-of-sale terminals, and embedded network gateways requiring stable component supply and long-term obsolescence management.

Supply support for SC28L202A1DGG,118 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 company formed from the spin-off of Philips Semiconductors in 2006, specializing in secure connectivity solutions for automotive, industrial, and IoT markets.

The SC28L202A1DGG,118 belongs to NXP's legacy communication interface product line, designed specifically for backward-compatible integration into 5 V microcontroller-based systems requiring dual asynchronous serial ports with deterministic interrupt handling and diagnostic capability.

FAQ

What bus interface standards does the SC28L202A1DGG,118 support?

The SC28L202A1DGG,118 supports both Intel 80xxx-style (multiplexed AD bus with latch enable) and Motorola 68xxx-style (separate address/data buses) interfaces. Selection is controlled by MODE[1:0] pins at power-up, allowing drop-in replacement in either architecture without redesigning the host interface logic. This dual-mode capability makes SC28L202A1DGG,118 especially valuable for maintaining legacy designs across different microcontroller families.

Does the SC28L202A1DGG,118 include hardware flow control support?

Yes, the SC28L202A1DGG,118 provides dedicated RTS and CTS pins for each UART channel (RTSA/CTSA and RTSB/CTSB), enabling full hardware handshaking. The MR1 and MR2 registers configure receiver-initiated RTS assertion and transmitter-gated CTS response, ensuring reliable data transfer even under variable peripheral response times. This hardware flow control is fully independent per channel and does not rely on software intervention, making SC28L202A1DGG,118 suitable for real-time industrial serial links.

What is the maximum baud rate supported by the SC28L202A1DGG,118?

The SC28L202A1DGG,118 supports a maximum baud rate of 1.5 Mbps per channel when driven by an appropriate crystal or clock source and configured with optimal BRG divider values. This specification is confirmed in the "Electrical Characteristics" section of the official NXP datasheet (document number SC28L202). Achieving 1.5 Mbps requires proper signal integrity layout and compatible line drivers, as SC28L202A1DGG,118 itself outputs CMOS-level signals.

How does the interrupt arbitration system work in the SC28L202A1DGG,118?

The SC28L202A1DGG,118 uses a priority-based interrupt arbitration system with three handshake signals: INT (interrupt request), DACKN (data acknowledge negative), and IACK (interrupt acknowledge). When multiple devices assert INT, the bus master responds with DACKN, and SC28L202A1DGG,118 then places its interrupt vector on the data bus upon receiving IACK. This ensures deterministic resolution in multi-master systems, distinguishing SC28L202A1DGG,118 from simpler UARTs lacking bidirectional arbitration logic.

Can the SC28L202A1DGG,118 operate in loopback diagnostic mode?

Yes, the SC28L202A1DGG,118 supports both local and remote loopback diagnostic modes via MR2[7:6] configuration. In local loopback, transmitted data is internally routed to the receiver path for self-test without external wiring. In remote loopback, the device instructs an external transceiver to echo data back - validating the complete physical layer. These modes are accessible through standard register writes and do not require special test pins, making SC28L202A1DGG,118 ideal for field-deployable diagnostics.