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TXB0108 output problem ?

TXB0108 output problem ?

This question is not answered
elsalvador
Posted by elsalvador
on Mar 28 2012 10:37 AM
Intellectual420 points

Dear TI-er.

I designed relay driver using TXB0108.

74HC238(Vcc 3.3V) -> (VccA 3.3V) TXB0108 (VccB 5V) -> ULN2003 -> Relay

But, TXB0108 is output voltage 2.5V to ULN2003.

I removed ULN2003. It is work fine.

How I solve problem.

plz help me.

 

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  • Junjie Mai
    Posted by Junjie Mai
    on Mar 28 2012 23:49 PM
    Intellectual2990 points

    Hi,  Elsalvador

    For TXB0108, when you used it, you need to be careful for the pull up or pull down resistor  adding, pull up or pull down resistor should be larger than 60kohms,  based on the checking the datasheet of ULN2003, there are several pull down resistors which split the voltage output with pull up resistor(about 5kohms) inside the TXB0108.

    So for TXB0108, it is not the suitable part for your design if you keep the ULN2003 with pull down resistor inside. we prefer you to use the SN74LVC8T245.

    http://www.ti.com/product/sn74lvc8t245

    BR
    Junjie

     

     

     

     

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