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The NI 6551/6552 is a 20-channel digital I/O device that you can use as a PC/peripheral device interface, pattern generator, pattern analyzer, or stimulus-response tester. The NI 6551 has a maximum Sample clock frequency of 50 MHz, and the NI 6552 has a maximum Sample clock frequency of 100 MHz.
The NI 6551/6552 also provides the following features:
You can use the internal On Board Clock or import an external clock through the front panel. You can also shift the generated data, acquired data, and exported Sample clock relative to the onboard clock for clock frequencies above 25 MHz, which is critical when accounting for propagation delays and setup and hold times in the DUT.
Expand this book for more information about NI 6551/6552 hardware-related topics.