SN74AVC2T245: SIM card buffer

user4760726

Part Number: SN74AVC2T245
Other Parts Discussed in Thread: SN74AXC2T245, SN74AXC2T45

Hi team,

I just want to confirm that whether customer can use SN74AVC2T245 as buffer for SIM card application. Please advised. thanks!

Best Regards,

Leroy Song

over 4 years ago

0 user4760726 over 4 years ago

TI__Intellectual 1195 points

The speed is 4MHz and signals are clock data and reset.

Best Regards,

Leroy Song

0 Clemens Ladisch over 4 years ago

Guru 283290 points

The data line is bidirectional, so the AVC will not work.

TI makes SIM level translators.

0 Dylan Hubbard over 4 years ago in reply to user4760726

TI__Mastermind 44765 points

Hey Leroy,

This is a generic translator and does not care what communication interface its being used for. If the parameters listed in the data sheet meet the system parameters then it can work. However, I recommend the customer use the newer SN74AXC2T245.

Also just note this is a 2 channel device and it looks like you mentioned 3 different signals.

0 user4760726 over 4 years ago in reply to Dylan Hubbard

TI__Intellectual 1195 points

Dylan,

Thanks for the comment. Here are some follow-up questions.

I saw other thread () mentioned about SN74AXC2T45 can be used for Clock and Reset, so can I use SN74AXC2T245 for data and SN74AXC2T45 for the other two signals (Clock and reset)? What is the difference between these two parts?
My Customer is designing to have about 20cm trace length and the specification is only 10cm. Do you think the devices are able to cover the other 10cm?
Is it possible to know how to design a buffer using voltage translator? Isn't just use the same voltage on both VCCA and VCCB? Please advised.

Best Regards,

Leroy Song

0 Clemens Ladisch over 4 years ago in reply to user4760726

Guru 283290 points

The different between the '45 and the '245 device is that the '245 has two separate DIR inputs, one for each channel.

10 cm is no problem for a buffered device.

These translators allow V_CCA and V_CCB to be the same. (You could also use a transceiver with a single V_CC, or a plain buffer for unidirectional signals.)

The SIM data line is bidirectional, so it is not possible to use it with any '45 or '245 translator.

0 user4760726 over 4 years ago in reply to Clemens Ladisch

TI__Intellectual 1195 points

Clemens,

Thanks for the feedback. What you mean that we currently don't have the device that can be used for SIM data line right?

Best Regards,

Leroy Song

0 Clemens Ladisch over 4 years ago in reply to user4760726

Guru 283290 points

TI makes SIM card voltage translators.

Because of the holidays, TI E2E™ design support forum responses will be delayed from Dec. 25 through Jan. 2. Thank you for your patience.

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SN74AVC2T245: SIM card buffer