TS3V712E: IO Pins behavior when no VDD present

SimonF

Part Number: TS3V712E

Hi Team,

my customer wants to use the TS3V712E to multiplex between to interfaces AND be able to completely disconnect all devices. Since TS3V712E has no EN pin the only way to do that would be to switch VDD of the part off. But on the A side there are 3.3V 100k PUs. How would the part behave without any voltage on VDD but 3.3V on the A pins? Are all pins High-Z or would it draw some current?

Thank you!

Best regards

Simon

over 5 years ago

0 Saminah C over 5 years ago

TI__Genius 9132 points

Hi Smon,

The Electrical specifications table has the Ioff spec at VDD= 0 ,

It states the leakage current with VDD = 0V showing that the I/O signal path is Hi-Z.

Regards

Saminah

0 SimonF over 5 years ago in reply to Saminah C

TI__Expert 3380 points

Hi Saminah,

the line is specified for Vo 0 to 3.6V (which should be Bx and Cx) and Vi = 0V (which should be Ax). So there is no specification for Vdd = 0V and Ax beeing pulled to 3.3V. Would this result in a bigger current draw than the 1 uA?

Best regards

Simon

0 Saminah C over 5 years ago in reply to SimonF

TI__Genius 9132 points

Hi Simon,

It should be the same (1 uA).

Ioff is the maximum leakage current into an input or output terminal of the device, with the specified voltage applied to the terminal and VCC = 0 V

The Ioff protection circuitry ensures that no excessive current is drawn from or to an input, output, or combined I/O that is biased to a specified voltage while the device is powered down.

You can take a look at the spec in TS3V712EL datasheet - the main difference from TS3V712E is VDD_5 supply but it specifies Ioff with more detailed conditions.

Regards

Saminah

0 SimonF over 5 years ago in reply to Saminah C

TI__Expert 3380 points

Hi Saminah,

thank you for your support!

You say it should be the same. Can you be 100% sure? Maybe test it in the lab or ask a designer?

There are two additional questions which are important for my customer:

a) All switches are suitable for bidirectional signals, i.e. they conduct and block in both directions.
b) The changeover switches with the indices 0 to 4 and those with the indices 5 and 6, are all seven identical?

Best regards,

Simon

0 Saminah C over 5 years ago in reply to SimonF

TI__Genius 9132 points

Hi Simon,

I am confirming with the designer on the Ioff spec - i'll get back to you on this soon.

a) ) All switches are suitable for bidirectional signals, i.e. they conduct and block in both directions.

The first line of the data sheet (Found HERE) under the 'Description/Ordering Information' lists it as a Multiplexer/Demultiplexer, thus defining it to be bidirectional.

See the thread below to answer your question.