NI 655x

The NI 655x 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 655x also provides the following features:

• Sophisticated timing engine to maintain and measure the timing parameters of the DUT
• Programmable voltage levels for testing multiple devices or characterizing a single device under varying conditions
• Data channels with per channel direction control
• Deep onboard memory with triggering and pattern sequencing capabilities
• Ability to use NI-TClk to synchronize multiple devices
• Per pin, per cycle tristate capabilities
• Support for real-time hardware comparison of actual response data with expected response data. For more information on this feature, refer to the National Instruments High-Speed Digital ATE and Stimulus Response Features white paper on ni.com.

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 655x hardware-related topics.