Texas Instruments USBN9602-28MX

Overview

USBN9602-28MX from National Semiconductor is a full-speed USB 1.1 function controller IC integrating transceiver, 3.3V regulator, 48 MHz oscillator circuit, Serial Interface Engine (PHY+MAC), and seven endpoint FIFOs (1× bidirectional EP0 + 3× TX + 3× RX). It supports DMA transfers and dual-mode 8-bit parallel interface (multiplexed/non-multiplexed) for microcontroller interfacing in embedded USB peripheral designs.

For engineers reviewing the USBN9602-28MX datasheet, USBN9602-28MX pinout, USBN9602-28MX application, or USBN9602-28MX equivalent, key selection criteria include its integrated 3.3V regulator for D+ pull-up, programmable CLKOUT, hardware-supported DMA for bulk/isochronous transfers, and MICROWIRE/PLUS serial interface compatibility - all in a 28-pin SO package.

Technical Context

The USBN9602-28MX implements a complete USB 1.1-compliant Serial Interface Engine with dedicated Physical Layer Interface (PHY) for NRZI decoding, clock recovery (12 MHz from 48 MHz source), bit stuffing/unstuffing, and Media Access Controller (MAC) handling CRC, packet formatting, and ACK/NAK/STALL handshakes. Its transceiver meets USB 1.1 electrical requirements with differential and single-ended receivers plus slew-rate-controlled transmitter.

Endpoint control is managed by a dedicated Endpoint Pipe Controller supporting seven pipes: one 8-byte bidirectional control endpoint (EP0) and six unidirectional endpoints (three 32-byte TX, one 64-byte TX; three 32-byte RX, one 64-byte RX). The device supports suspend/resume states, remote wakeup, and event-driven interrupt signaling via programmable INTR output.

Key Specifications

Pinout & Package

USBN9602-28MX is housed in a 28-pin SOIC package (NS package code M28B) with standard 0.3-inch body width and 1.27 mm pitch. Pin functions are validated per National Semiconductor datasheet SNOS029A (November 1998).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar USB function controller applications.

Compared with CY7C63723-SXC, USBN9602-28MX offers simpler hardware integration with built-in regulator and oscillator but requires external MCU; versus USB2422, it serves a fundamentally different architectural role as a function controller rather than a hub IC - making it uniquely suited for embedded USB peripheral endpoints.

Availability

USBN9602-28MX is available at Aetrix Electronics and suitable for industrial data loggers, medical diagnostic probes, USB printer peripherals, and secure HID keypads requiring stable component supply and long-term obsolescence management.

Supply support for USBN9602-28MX 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

National Semiconductor was a U.S.-based semiconductor company specializing in analog, interface, and mixed-signal ICs before its acquisition by Texas Instruments in 2011. Known for high-reliability industrial and communications solutions.

The USBN9602-28MX belongs to National's early USB function controller product line, designed specifically for cost-sensitive, low-pin-count embedded peripherals needing full-speed USB connectivity without external PHY or voltage regulation.

FAQ

What USB specification versions does the USBN9602-28MX support?

The USBN9602-28MX supports USB Specification Versions 1.0 and 1.1 exclusively, operating at full speed (12 Mbps). It does not support USB 2.0 high-speed (480 Mbps) or later standards. Its Serial Interface Engine implements full PHY and MAC layers compliant with USB 1.1 electrical and protocol requirements, including bit stuffing, CRC generation, and endpoint state management as defined in the specification.

Does the USBN9602-28MX require an external crystal or can it use an external clock source?

The USBN9602-28MX supports both configurations: it can drive a 48 MHz third-overtone crystal between XIN and XOUT pins, or accept an external 48 MHz clock signal applied to XIN (with XOUT left unconnected). The oscillator circuit is designed for crystals like ECS-480-S-1-3OT; layout guidelines emphasize minimizing stray capacitance and inductance near XIN/XOUT to ensure stable 48 MHz operation essential for USB timing compliance.

How does the USBN9602-28MX handle USB suspend and resume events?

The USBN9602-28MX detects USB suspend via the Serial Interface Engine and asserts internal suspend state, reducing current draw. It supports remote wakeup through the D+ line and responds to host-initiated resume signaling. The device reports these events via the Main Event Register (MAEV) and can generate interrupts on INTR pin. Firmware must manage transition timing and re-enable endpoints post-resume; the 3.3V regulator remains active unless explicitly disabled.

Can the USBN9602-28MX operate from a 3.3V supply instead of 5V?

Yes - the USBN9602-28MX can operate in 3.3V systems by disabling its internal 3.3V regulator and supplying clean 3.3V directly to the V3.3 pin, while powering Vcc from 3.3V (within absolute maximum ratings). The regulator is software-disabled via control register; doing so eliminates regulator dropout and allows direct 3.3V transceiver operation. External 1.5 kΩ D+ pull-up must then be referenced to the same 3.3V rail.

What are the memory-mapped register access methods supported by the USBN9602-28MX?

The USBN9602-28MX supports two parallel interface addressing modes: non-multiplexed (using separate A0, D[7:0], RD/WR) and multiplexed (using AD[7:0], ALE, RD/WR), selected by MODE[1:0]. Both use ADDRESS, DATA_IN, and DATA_OUT registers. In non-mux mode, A0 selects between ADDR and DATA registers; in mux mode, ALE latches address. MICROWIRE mode uses serial command/address byte format with CMD[1:0] and 5-bit address fields.