The ISP1181 is a Universal Serial Bus (USB) interface device which complies with Universal Serial Bus Specification Rev. 1.1. It provides full-speed USB communication capacity to microcontroller or microprocessor-based systems. The ISP1181 communicates with the system’s microcontroller or microprocessor through a high-speed general-purpose parallel interface. The fully autonomous Direct Memory Access (DMA) operation - auto download, auto repeat, auto execution - removes the need for the device to re-enable or re-initialize the DMA operation every time. The modular approach to implementing a USB interface device allows the designer to select the optimum system microcontroller from the wide variety available. The ability to re-use existing architecture and firmware investments shortens development time, eliminates risks and reduces costs. The result is fast and efficient development of the most cost-effective USB peripheral solution. The ISP1181 is ideally suited for application in many personal computer peripherals, such as printers, scanners, external mass storage (zip drive) devices and digital still cameras. It offers an immediate cost reduction for applications that currently use SCSI implementations.
The ISP1181 is a full‑speed USB interface device that connects to microcontrollers or microprocessors via a high‑speed parallel interface. It includes autonomous DMA operation (auto‑download, auto‑repeat, auto‑execution) and complies with USB Specification Rev. 1.1.
The device offers up to 14 programmable USB endpoints, 2462 bytes of internal FIFO memory, a 3.3 V on‑chip regulator, 6 MHz crystal oscillator with PLL, and a programmable clock output up to 48 MHz. It operates from 3.0 V to 5.5 V, supports bus‑powered mode, and includes features such as GoodLink LED status and SoftConnect control.
| USB speed | Full‑speed (12 Mbit/s) |
|---|---|
| USB endpoints | up to 14 programmable |
| FIFO memory | 2462 bytes |
| Supply voltage | 3.0 V to 5.5 V |
| Regulator voltage | 3.3 V |
| Crystal oscillator | 6 MHz with integrated PLL |
| Operating temperature | -40 °C to +85 °C |
| ESD protection | 8 kV in‑circuit |
The ISP1181 operates at full‑speed USB (12 Mbit/s).
It supports up to 14 programmable USB endpoints.
The device works from 3.0 V to 5.5 V.
Yes, it has an internal 3.3 V regulator for the USB transceiver.