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Compatibility of Digital I/O lines on the 78xx R series FPGA RIO Boards

Hardware: Reconfigurable I/O (RIO)>>R Series

Problem: Are the digital lines on 78xx series RIO FPGA devices compatible with CMOS and/or TTL logic?

Solution:

The digital input and output lines of the 78xx series devices are compatible with almost all CMOS and TTL logic devices.

The follwing list describes compatibility of the digital I/O:

The 78xx can:
- Receive signals from 3V or 5V TTL or CMOS devices with no additional circuitry.
- Drive signals to 3V or 5V TTL devices with no additional circuitry.
- Drive signals to 3V CMOS devices with no additional circuitry.

The 78xx cannot:
- Directly drive a signal to a 5V CMOS device.  The Voh of the 78xx isn't high-enough to guarantee a valid logic high at the receiving device.  To fix this problem, all you have to do is add an external pull-up resistor to 5V on the digital output line.

Included Devices:
PXI-7811R
PXI-7813R
PXI-7830R
PXI-7831R
PXI-7833R

PCI-7811R
PCI-7813R
PCI-7830R
PCI-7831R
PCI-7833R

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Report Date: 06/08/2006
Last Updated: 10/23/2006
Document ID: 3Y79G91J

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