USB-4751/4751L is a 48/24-bit digital I/O module for the USB bus. Its
48/24 bits are divided into 6/3 8-bit I/O ports and users can configure
each port as input or output via software. USB-4751/USB-4751L also
provides one event counter and three 16-bit timers, which can be
cascaded to become a 32-bit timer.
Features
Compatible with USB
1.1/2.0
Portable
Bus-powered
48 TTL digital I/O lines
Emulates mode 0 of 8255 PPI
Buffered circuits for higher driving
capacity than 8255
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