Texas Instruments USBN9604SLBX/NOPB

Overview

USBN9604SLBX/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 host-peripheral bridge applications in industrial controllers and legacy USB peripherals.

For engineers reviewing the USBN9604SLBX/NOPB datasheet, USBN9604SLBX/NOPB pinout, USBN9604SLBX/NOPB application, or USBN9604SLBX/NOPB equivalent, this page delivers verified technical context, exact pin functions for SLB CSP package, real-world use cases in bus-powered devices, and two validated alternative controllers with documented functional and interface differences.

Technical Context

The USBN9604SLBX/NOPB implements a complete USB 1.1-compliant physical layer (PHY) and media access controller (MAC) with integrated differential transceiver, on-chip 3.3V regulator for D+/D− termination, and clock recovery logic extracting 12 MHz from a 48 MHz internal PLL clock derived from 24 MHz crystal input. Its SIE handles bit stuffing/unstuffing, CRC generation/checking, and endpoint address detection per USB specification.

Endpoint Pipe Controller (EPC) manages seven dedicated pipes: one bidirectional control endpoint (EP0) and six unidirectional endpoints (three TX, three RX), each with independent FIFOs and status registers. The device supports automatic NAK recovery (up to 16 KB), programmable interrupt polarity, and fully static HALT mode with asynchronous wake-up-enabling low-power bus-powered operation without external reset circuitry.

Key Specifications

Pinout & Package

USBN9604SLBX/NOPB is housed in a 28-pin Chip Scale Package (CSP) with 0.5 mm pitch, optimized for compact portable designs. Pin functions are electrically identical to the SOIC-28 variant but mapped to a smaller footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with USBN9603SLBX/NOPB, the USBN9604SLBX/NOPB adds hardware reset control for deterministic initialization, while versus CY7C63101A-SXC it delivers deeper FIFOs, autonomous DMA, and integrated power regulation-making it superior for bus-powered, high-bandwidth embedded USB peripherals.

Availability

USBN9604SLBX/NOPB is available at Aetrix Electronics and suitable for industrial USB adapters, legacy peripheral bridges, and bus-powered test equipment requiring stable component supply across extended product lifecycles.

Supply support for USBN9604SLBX/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 before its acquisition by Texas Instruments in 2011; its legacy USB controllers remain widely deployed in industrial systems.

The USBN9604SLBX/NOPB belongs to National's USB Node Controller family, designed specifically for cost-sensitive, space-constrained embedded systems needing full-speed USB 1.1 compliance with minimal external components.

FAQ

What is the primary function of the USBN9604SLBX/NOPB in a USB system?

The USBN9604SLBX/NOPB serves as a full-speed USB 1.1 node controller, implementing the physical layer (PHY), media access controller (MAC), transceiver, and endpoint management logic. It enables microcontrollers without native USB support to act as USB devices-handling enumeration, token processing, data transfer, and error recovery autonomously. Its integrated features reduce host CPU overhead and external component count in embedded USB peripherals.

Does the USBN9604SLBX/NOPB require an external crystal, and what are the key oscillator specifications?

Yes, the USBN9604SLBX/NOPB requires a 24 MHz fundamental AT-cut crystal connected between XIN and XOUT pins. Per the datasheet, the crystal must have ≤50 Ω series resistance, ≤10 pF shunt capacitance, and 20 pF load capacitance. External 15 pF capacitors (C1/C2) and a 1 MΩ resistor (R1) are mandatory for stable oscillation. An external 24 MHz clock may substitute for the crystal, in which case XOUT must be left unconnected.

How does the USBN9604SLBX/NOPB handle power supply for the USB transceiver?

The USBN9604SLBX/NOPB integrates a 3.3V voltage regulator accessible via the V3.3 pin. When enabled, it powers the internal transceiver and the mandatory 1.5 kΩ D+ pull-up resistor-requiring only a 1 µF tantalum capacitor to AGND. In 3.3V system designs, the regulator can be disabled, and V3.3 used as an input supply. This dual-mode operation eliminates the need for an external LDO in most implementations.

What are the key differences between USBN9604SLBX/NOPB and USBN9603SLBX/NOPB?

The USBN9604SLBX/NOPB and USBN9603SLBX/NOPB share identical functionality, pinout, and electrical characteristics except for reset behavior. The USBN9604SLBX/NOPB includes a dedicated active-low RESET pin enabling hardware-initiated reset independent of power sequencing, whereas the USBN9603SLBX/NOPB relies solely on power-on reset. This makes USBN9604SLBX/NOPB preferable in systems requiring controlled reset coordination or brown-out recovery.

Can the USBN9604SLBX/NOPB operate in low-power modes, and how is wake-up managed?

Yes, the USBN9604SLBX/NOPB supports a fully static HALT mode with asynchronous wake-up triggered by USB bus events-including resume signaling, reset pulses, or remote wakeup requests. During HALT, the core logic enters zero-power state while retaining register contents; the integrated power-on reset and clock recovery circuitry ensure reliable wake-up without external supervision-ideal for bus-powered portable instruments.