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TXS0102: TXS0102 high consumption

Sarah Houtain8
Prodigy 10 points

Part Number: TXS0102

Hello, 

I am using the TXS0102 level-shifter between a 4.5 V (VCCB) and 2.5 V (VCCA). 

On of the 2 signals is coming from a NAND gate to a MCU; and this signal works. 

The second one is coming from a comparator (to the same MCU) and its voltage is at 0.5 V (more or less) even when the comparator output should be 0. 

When disconnecting the level-shifter, comparator output is well at 0V and global consumption drops.

I though a pull down will help but even with 1k, the signal drops to 0.3V like something inside pull-up the signal and increase the consumption. 

Can you explain this ? 

If the chip is broken, could it be because VCCB is before the enable and VCCA ? 

Looking forward to your feedback!

Best regards, 

Sarah 

  • 0
    TI__Guru 62990 points

    Hi Sarah,

    There are internal pullup resistors within the TXS0102 ( 10K on each A and B ports). This will generate additional current which flows into the driver which needs to sink it and be able to hold the line low. 

    If the driver is not able to sink the current, the Vol level rises. Having a pulldown resistors will affect the output Voh of the device by forming a voltage divider.

    The effects have been explained here in the app note below:

    www.ti.com/.../scea054a.pdf