Data Translation DT330 Series, Getting Started Manual

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Appendix A
48
Digital Inputs
TTL-type inputs must have current limiting so that circuitry is not
damaged when power is removed. On all Data Translation PCI
boards, current limiting is used to prevent damage in this fault
condition.
On high-speed clock inputs, a ground that is located in the connector
next to the clock must be connected as a twisted pair with the
high-speed clock input.