USB2507-ADD
USB2507-ADD - USB 2.0 7-Port Hub | Microchip Technology
The Rochester Electronics USB2507-ADD is an integrated USB 2.0-compatible seven-port hub controller based on the SMSC USB2507, packaged in an 80-pin TQFP measuring 12 x 12 mm. It supports seven downstream USB connections at low speed, 1.5 Mb/s, full speed, 12 Mb/s, and—when attached to a high-speed host—high speed, 480 Mb/s. Configuration does not require custom firmware, making the device suitable for embedded USB expansion, legacy PC systems, printers, storage peripherals, and industrial equipment.
A USB hub controller is an interface IC that bridges one upstream USB host connection to multiple downstream ports while transaction translators isolate traffic on each active link. Within the USB interface hierarchy, the USB2507 family belongs to the seven-port hub-controller class and implements USB 2.0 connectivity. Per-port or ganged downstream power control can be selected, while bus-powered and self-powered source conditions can be detected. Configuration can use strapping options, an external EEPROM, or a microcontroller interface; with the latter, the hub operates as an SMBus slave.
Key verified capabilities include seven transaction translators, operation at 1.5 Mb/s, 12 Mb/s, and 480 Mb/s, full power management, selectable per-port or ganged power control, and bus-power or self-power detection. The controller also supports an on-board 24 MHz crystal driver or a 24 MHz external clock, an internal PLL for 480 MHz USB 2.0 sampling, and an integrated 1.8 V linear voltage regulator. These blocks reduce the external clock, timing, and supporting circuitry normally required by a multiport USB hub.
The -ADD order code is offered in the same 80-TQFP, 12 x 12 mm package identified for USB2507-ADT by the verified distributor data. Because both parts use the same base USB2507 family, that package relationship supports direct footprint reuse, although functional equivalence should still be confirmed against the manufacturer pin table and ordering information. The manufacturer documentation also identifies SMBus and serial configuration paths, supporting designs that require adjustable runtime or manufacturing configuration.
Typical installations include legacy industrial computers, medical carts, test systems, peripheral concentrators, USB-to-serial equipment, and embedded platforms needing more than the host controller's native ports. In a typical design, one upstream USB line connects to the host, while seven downstream routes connect to internal or external connectors. The principal engineering constraints are USB differential routing, correct power budgeting, connector protection, support for bus- or self-powered operation, and compliance with the electrical requirements stated in the manufacturer datasheet.
When laying out the board, treat the differential USB pairs as controlled-impedance nets and keep upstream and downstream routing separated to minimize crosstalk. Provide the crystal or supported 24 MHz clock network exactly as specified, place decoupling close to the supply pins, and confirm that downstream power switches can meet the required inrush and over-current behavior. The USB2507-ADD can simplify firmware development, but it does not remove the need for correct host support, power architecture, connector design, and USB signal integrity.
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