Texas Instruments USBN9603SLBX/NOPB

Overview

USBN9603SLBX/NOPB from National Semiconductor is a full-speed USB 1.1 node controller IC integrating transceiver, 3.3V regulator, Serial Interface Engine (SIE), seven endpoint FIFOs (1×8-byte control + 6×64-byte data), 8-bit parallel/MICROWIRE interface, and enhanced DMA engine. It operates at 5V or 3.3V, supports 24 MHz crystal input with internal 48 MHz PLL clock generation, and targets embedded USB peripheral designs such as industrial HID devices and USB-to-parallel adapters.

For engineers reviewing the USBN9603SLBX/NOPB datasheet, USBN9603SLBX/NOPB pinout, USBN9603SLBX/NOPB application, or USBN9603SLBX/NOPB equivalent, key selection criteria include its non-multiplexed/multiplexed CPU interface flexibility, automatic DMA (ADMA) for CPU-independent bulk transfers, integrated 3.3V transceiver supply, programmable interrupt polarity, and 28-pin CSP package footprint optimized for space-constrained designs.

Technical Context

The USBN9603SLBX/NOPB implements a complete USB 1.1-compliant Physical Layer (PHY) and Media Access Controller (MAC) in its SIE, including NRZI decoding, bit stuffing/unstuffing, CRC generation/checking, and clock recovery from 48 MHz derived via PLL from 24 MHz input. Its transceiver meets USB 1.1 Chapter 7 electrical requirements with differential receiver, single-ended receivers (0.8–2.0 V threshold), and slew-rate-controlled transmitter.

Endpoint Pipe Controller (EPC) manages seven dedicated pipes: one bidirectional control endpoint (EP0) and six unidirectional endpoints (three TX, three RX), each with independent FIFO, status, and command registers. The device supports both standard and burst access modes on its 8-bit parallel interface, selectable via MODE1–MODE0 pins, and includes MICROWIRE/PLUS serial interface mode for microcontroller integration without address/data buses.

Key Specifications

Pinout & Package

USBN9603SLBX/NOPB is housed in a 28-pin Chip Scale Package (CSP) with bottom-terminal land grid array (LGA) footprint, optimized for compact portable and embedded applications. Pin functions are defined by MODE1–MODE0 configuration and support parallel or serial microcontroller interfacing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with USBN9604SLBX/NOPB, the USBN9603SLBX/NOPB offers identical feature set and package but simpler reset timing-making it preferable for cost-sensitive, non-DLL-dependent designs; versus CP2102-GM, it provides full USB function controller flexibility at the expense of higher firmware development effort.

Availability

USBN9603SLBX/NOPB is available at Aetrix Electronics and suitable for industrial HID devices, USB-to-parallel adapters, embedded test instruments, and USB firmware loaders requiring stable component supply and long-term obsolescence management.

Supply support for USBN9603SLBX/NOPB 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 and interface ICs, acquired by Texas Instruments in 2011; its legacy USB controller portfolio remains widely deployed in industrial and embedded systems.

The USBN9603SLBX/NOPB belongs to National's USB Node Controller family, designed specifically to simplify USB peripheral implementation in resource-constrained embedded systems requiring full-speed connectivity, flexible host interfacing, and low-power operation.

FAQ

What is the primary function of the USBN9603SLBX/NOPB in a USB system?

The USBN9603SLBX/NOPB serves as a full-speed USB 1.1 node controller, acting as the USB function device that connects an embedded system to a USB host. It handles physical layer signaling, protocol processing (via its integrated SIE), endpoint management, and data movement between the USB bus and the host microcontroller-enabling custom USB peripherals without requiring a USB host stack.

Does the USBN9603SLBX/NOPB support USB high-speed (480 Mbps) operation?

No, the USBN9603SLBX/NOPB supports only USB full-speed operation at 12 Mbps per the USB 1.0 and 1.1 specifications. It lacks the transceiver architecture, PHY enhancements, and timing circuitry required for high-speed (480 Mbps) mode. Its design targets cost-sensitive, low-complexity USB peripheral applications where full-speed bandwidth is sufficient.

Can the USBN9603SLBX/NOPB operate from a 3.3V supply without using its internal voltage regulator?

Yes, the USBN9603SLBX/NOPB supports direct 3.3V operation: in this mode, the internal 3.3V regulator is disabled, and the V3.3 pin must be driven externally with a clean 3.3V supply to power the transceiver. This configuration eliminates regulator overhead and is commonly used in systems already providing a regulated 3.3V rail.

What is the role of the MODE1 and MODE0 pins on the USBN9603SLBX/NOPB?

The MODE1 and MODE0 pins are hard-wired inputs that configure the USBN9603SLBX/NOPB's host interface mode: 00 selects non-multiplexed parallel, 01 selects multiplexed (Intel-compatible) parallel, and 10 selects MICROWIRE/PLUS serial interface. These pins determine signal routing for CS, RD, WR, A0/ALE/SI, and D0–D7/SO/SI-defining how the host CPU communicates with the USBN9603SLBX/NOPB.

How does the Automatic DMA (ADMA) feature of the USBN9603SLBX/NOPB improve system performance?

The ADMA feature in the USBN9603SLBX/NOPB enables fully autonomous transfer of up to 16 KB of data across bulk or isochronous endpoints without CPU involvement-by automatically managing packet boundaries, PID toggling, and NAK recovery. This reduces firmware overhead, frees the host processor for other tasks, and ensures deterministic timing for time-critical data streams like audio or sensor sampling.