TXS0108E-Q1: Clarification regarding the TXS0108E-Q1

Ramkumar K

Prodigy 50 points

Part Number: TXS0108E-Q1

Hi Jack,

As per the review point provided, I like to have few more clarification.

Regarding the pull up resistor value, it is provided as per the recommendation from the SD Card mnodule, still it is required to remove.
series termination resistor is provided to supress the reflection noise due to long traces in the pcb, may i know once still it is required to remove the termination resistor ?

2 months ago

0 Jack Guan 2 months ago

TI__Guru 52371 points

Hi Ramkumar,

1. The internal pullups of the TXS0108E-Q1 will be able to pull the bus up to VCC should the SD card module require it to be implemented. If still desirable to use external pullups, the value should be chosen to be weaker than >40kohms.

2. Strong values can be used for dampening resistors, i.e 33ohms to impdeance match against the transmission medium. Here is an FAQ that covers this topic further:

[FAQ] What happens when I connect a logic device's output to a 50 ohm transmission line?

Regards,

Jack

Interface

Interface forum

TXS0108E-Q1: Clarification regarding the TXS0108E-Q1