ISP1521 is a USB hub controller IC produced by ST-NXP Wireless company. It can be connected to a Hi-Speed USB host or hub, or to an Original USB host or hub. If it is connected to a Hi-Speed USB host or hub, then the ISP1521 will operate as a Hi-Speed USB hub. It can support high, full, and low speed data transmission modes.
The ISP1521 is a stand‑alone Universal Serial Bus (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) data transfers and can operate as either a Hi‑Speed or an Original‑Speed hub depending on the upstream host.
The device provides seven downstream ports (ports 3‑7 can be disabled), built‑in analog over‑current detection, per‑port LED indicators, and a 12 MHz crystal oscillator with on‑chip PLL. It is self‑powered and targets applications such as monitor hubs, notebook docking stations, motherboard USB hubs, and hub boxes.
| Supported USB speeds | High‑speed (480 Mbit/s), Full‑speed (12 Mbit/s), Low‑speed (1.5 Mbit/s) |
|---|---|
| Number of downstream ports | 7 (ports 3‑7 can be disabled) |
| Operating temperature range | –40 °C to +70 °C |
| Package | LQFP80 (12 mm × 12 mm × 1.4 mm) |
| Crystal oscillator frequency | 12 MHz |
| Power mode | Self‑powered |
| Over‑current detection | Analog circuit with optional digital input |
It supports high‑speed (480 Mbit/s), full‑speed (12 Mbit/s) and low‑speed (1.5 Mbit/s) transfers.
The controller provides seven downstream ports, and ports 3‑7 can be disabled if not needed.
Yes, the device is designed for self‑powered hub designs.
It includes an analog over‑current detection circuit that can also accept digital over‑current signals, selectable via a mode pin.