Zero Ohm Resistor for pull up/down in CY7B991 Select Lines | Cypress Semiconductor
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Zero Ohm Resistor for pull up/down in CY7B991 Select Lines
Are there any functional issues with using a zero ohm resistor to set the level to low for each of the select inputs 4F0, 4F1, 3F0, 3F1, 2F0, and 2F1?
One can have a zero ohm resistor pulling down the three-level inputs. There would not be any functional issues using a zero ohm resistor to set the level to low for each of these inputs.
The three-level inputs of CY7B991 can be modeled by a pull-up and pull-down resistor. The internal resistor values for the three-level inputs are approximately a 25-kohm pull-up and 25-kohm pull-down. The internal circuitry holds unconnected inputs to VCC/2. To pull up/down the three-level input you can connect the input pin to VCC/GND through a resistor. The resistor value must be less than 1 kohm to insure the VIHH and VILL meeting the specification. Zero ohm resistor is okay to use pulling up/down the three level inputs