Resistor value for CPLD's latch up

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vaf20

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hello my friends
i use xilinx XC9500 series CPLD.this CPLD's work as interfaces between a general bus and other blocks.i used a resistor in each data line which get from bus as latch up resistor.i looked for a formula to figure out resistor value but nothing find.
any comment ?
BTW, what the other issue i should take in acount?
tnx in advance
 

resistor for latchup

each FPGA chip has a latchup current specification,

you can calculate the resistor's value with the current requirement

for worst operating case.

best regards




 

cpld+latch

tnx amigo
could you show ma the link to XC9536 CPLD or spartanII FPGA latch up value?
TIA
 

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