The ISP1561 is a PCI-based, single-chip Universal Serial Bus (USB) Host Controller. It integrates two Original USB Open Host Controller Interface (OHCI) cores, one Hi-Speed USB Enhanced Host Controller Interface (EHCI) core and four transceivers that are compliant with Hi-Speed USB and Original USB. The functional parts of the ISP1561 are fully compliant with Universal Serial Bus Specification Rev. 2.0, Open Host Controller Interface Specifications Rev. 1.0a, Enhanced Host Controller Interface Specification for Universal Serial Bus Rev. 0.95, PCI Local Bus Specification Rev. 2.2 and PCI Bus Power Management Interface Specification Rev. 1.1. The integrated high performance USB transceivers enable the ISP1561 to handle all Hi-Speed USB transfer speed modes: high-speed (480 Mbit/s), full-speed (12 Mbit/s) and low-speed (1.5 Mbit/s). The ISP1561 provides four downstream ports that enables simultaneous connections of USB devices at different speeds. The ISP1561 provides three downstream port status indicators—GoodLink™ along with green and amber LEDs—to allow user-rich messages of the Root Hub downstream ports status, without requiring detailed port information to be reflected in the internal registers. The ISP1561 is fully compatible with various operating system drivers, such as Microsoft® Windows® standard OHCI and EHCI drivers that are present in Windows 98 Second Edition (SE)
The Philips ISP1561 is a PCI‑based, single‑chip USB host controller that integrates two OHCI cores, one EHCI core and four transceivers. It supports high‑speed, full‑speed and low‑speed USB transfers and provides four downstream ports with status LEDs.
The document includes functional descriptions, feature lists, ordering information, detailed pin configurations, and revision history, making it a comprehensive reference for designers and engineers integrating the ISP1561 into motherboards, add‑on cards, or embedded systems.
| Supported USB speeds | High‑speed 480 Mbit/s, Full‑speed 12 Mbit/s, Low‑speed 1.5 Mbit/s |
|---|---|
| Number of downstream ports | Four |
| Port indicator LEDs | GoodLink™, amber and green LEDs |
| Supply voltage | +3.3 V |
| Operating temperature range | -40 °C to +85 °C |
| Package type | LQFP128, 128 leads, 14 × 14 × 1.4 mm |
| PCI interface | 32‑bit, 33 MHz |
It supports high‑speed (480 Mbit/s), full‑speed (12 Mbit/s) and low‑speed (1.5 Mbit/s) transfers.
The controller provides four downstream ports, each with GoodLink™, amber and green LEDs for status indication.
The device operates from a +3.3 V power supply.
It is rated for -40 °C to +85 °C industrial temperature range.