TXS0104E: Sequence

user6235192

Part Number: TXS0104E

If both the power supply VCCA and VCCB are 0V, is it okay if a signal enters the OE, A port, or B port ?

Will there be unexpected logical values or failures ?

I would like to know if there is no problem even if only VCCA is powered on for a long time. There is no sequence requirement, but will only VCCA fail if the power is on for a long time?

over 4 years ago

0 Clemens Ladisch over 4 years ago

Guru 316760 points

Applying voltages to powered-off pins is OK; see [FAQ] Can the input voltage (Vi) to my logic device be higher than the supply voltage (Vcc)?

When only VCCA is up, a current will flow into VCCB and might power it up partially; see Biasing Requirements for TXS, TXB, and LSF Auto-Bidirectional Translators.

0 user6235192 over 4 years ago

Prodigy 65 points

Thank you for your reply.

＞Applying voltages to powered-off pins is OK; see [FAQ] Can the input voltage (Vi) to my logic device be higher than the supply voltage (Vcc)?

　⇒OK.　Does TXS0104 have the feature "Ioff - Partial Power Down Protection"?

　　I found that TXS0104 doesn't have positive clamp diodes.

＞When only VCCA is up, a current will flow into VCCB and might power it up partially; see Biasing Requirements for TXS, TXB, and LSF Auto-Bidirectional Translators.

　⇒Where should I read in the URL( Biasing Requirements for TXS, TXB, and LSF Auto-Bidirectional Translators)?

0 Clemens Ladisch over 4 years ago in reply to user6235192

Guru 316760 points

The name "Ioff" is used with other logic devices, but the effect is the same.

For the VCCA/VCCB separation, see section 1.1.

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TXS0104E: Sequence