ISP1520 is a USB 2.0 high-speed hub controller chip from ISP company, supports high-speed, full-speed and low-speed data transmission, can be connected to USB host or hub.
The ISP1520 is a stand‑alone USB hub controller IC that complies with USB Specification Rev. 2.0. It supports high‑speed (480 Mbit/s), full‑speed (12 Mbit/s) and low‑speed (1.5 Mbit/s) transfers and can operate as a Hi‑Speed or Original‑USB hub depending on the upstream port.
The device includes four downstream ports (ports 3 and 4 can be disabled), built‑in analog over‑current detection, configurable I²C‑bus access to descriptor data, and a 12 MHz crystal with on‑chip PLL. It is intended for self‑powered hub designs such as monitor hubs, docking stations, motherboard USB hubs, and hub boxes.
| Data transfer speeds | High‑speed 480 Mbit/s, Full‑speed 12 Mbit/s, Low‑speed 1.5 Mbit/s |
|---|---|
| Number of downstream ports | 4 (ports 3 and 4 can be disabled) |
| Operating temperature range | 0 °C to 70 °C |
| Maximum sink current per pin | 8 mA |
It supports high‑speed (480 Mbit/s), full‑speed (12 Mbit/s) and low‑speed (1.5 Mbit/s) USB transfers.
The chip provides four downstream facing ports; ports 3 and 4 can be disabled if not used.
Each pin can sink up to 8 mA.
The device includes an analog over‑current detection circuit that can also accept digital over‑current signals via an external pin.