TXB0104: Drive Strength (Output Drive Current/Source Current and Sink Current)
Part Number: TXB0104
I have two question.
1.Is it okay to input by open drain to TXB0104?
According to datasheet, the device can only translate Push-pull CMOS logic outputs. But I cannot find the mention about input.
2. Is it necessary to have enable state after VCCA and VCCB are high? or it has no rule about the enable?
And open-drain output is too weak to drive a TXB input high. (And if you make the pull-up resistor strong enough, the TXB output is too weak to override it.)
For open-drain signals, you would usually use the TXS0104E. For unidirectional signals, you would use a unidirectional or direction-controlled translator.
You need to pull down OE only if you need to ensure that the I/Os are high impedance during power-up/-down. If you do not care, you can connect OE directly to VCC.
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Is there a particular interface being used in the application? Please refer to the FAQ on translator by interface here:
What are the voltage nodes? As Clemens rightly suggested, consider using the TXS with built in internal pullup resistors for open drain signals to save on board space and cost.
Refer to the FAQ on the differences of TXS/ TXB/ LSF devices here:
Watch the Introduction to AXC Family
Read the app note on Glitch-free Power Sequencing for the AXC family
Evaluate the AXC8T245 EVM and watch the translation using the EVM
In reply to ShreyasRao:
Can you check the my attachment?
In my understanding, LSF0204 can also apply the open drain signal.
Is it okay to use such a attachment topology?
In reply to Masayuki Uchihara:
Can you reply it ?
Yes, LSF0204 supports both the open drain and push pull signals. The A and B IO pins is not referenced to Vrefa and VrefB respectively ; hence you can have B side to 3.3V and A side to 5V if needed.
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