Hello,
I have two questions regarding the usage of LSF0108:
1) Assuming I have the LSF0108 connected per Figure 9-1 of the datasheet:
- EN connected to VREF_B, both of which are connected to some power supply through a 200K resistor
- VREF_A connected to some other power supply
Will there be any leakage current on the VREF_A pin if VREF_A is biased high and the EN pin is pulled low?
2) In a different configuration, I need to use the LSF0108 to translate between 1.2V and 1.8V.
- Figure 9-4 of the datasheet suggests that I should connect the A-side ports to 1.2V through pullups and the B-side ports to 1.8V through pullups. In addition, VREF_B & EN should be tied together and connected to 1.8V through a 200K pullup.
- Section 5.3 of the Voltage-Level Translation With the LSF Family document suggests a slightly different setup for 1.2V to 1.8V translation where VREF_B & EN is instead connected to some voltage between 2V and 5.5V.
I'm guessing that both configurations are valid, but will the LSF0108 operate better (with a higher bandwidth or some other performance) in one scenario over the other? Also, do we need the pullups on the A-side ports to 1.2V if we follow the suggestion posed by the Voltage-Level Translation With the LSF Family document? The scenario posed by the datasheet seems to suggest that pullups to 1.2V are only needed because there isn't enough of a difference between VREF_A and VREF_B if VREF_B is connected to 1.8V.
Thanks,
Matthew
