SN74LVCC3245A: 5V TTL to 3.3V CMOS Bidirectional voltage translator

John11513

Expert 5640 points

Part Number: SN74LVCC3245A
Other Parts Discussed in Thread: SN74LXC8T245, SN74LV8T245

Tool/software:

Hi Team,

Do we have a voltage translator with same package/pinouts as SN74LVCC3245A but 5V side (VCCB side) is TTL compatible?

Thank you!

John

4 months ago

0 Clemens Ladisch 4 months ago

Guru 296270 points

No.

You could connect VCCB to 3.3 V (the inputs are overvoltage tolerant), if it is OK that the B-side outputs drive to 3.3 V.

0 John11513 4 months ago in reply to Clemens Ladisch

TI__Expert 5640 points

No, it’s not overvoltage tolerant.

thanks

John

0 Michael Ikwuyum 4 months ago in reply to John11513

TI__Mastermind 37625 points

Hi John,

Please help see [FAQ] Can the input voltage (Vi) to my logic device be higher than the supply voltage (Vcc)? to help confirm how the device is overvoltage tolerant, thanks.

Best Regards,

Michael.

0 John11513 4 months ago in reply to Michael Ikwuyum

TI__Expert 5640 points

Why not check the datasheet for that? Based on "Absolute Maximum Ratings" in SN74LVCC3245A datasheet, either side-A or side-B, the absolute maximum voltage tolerance is Vcc+0.5V:

Thanks,

John

0 Michael Ikwuyum 4 months ago in reply to John11513

TI__Mastermind 37625 points

Hi John,

Apologies for the confusion as you are right and SN74LXC8T245 is equivalent replacement for over voltage tolerant applications, thanks.

Best Regards,

Michael.

0 John11513 4 months ago in reply to Michael Ikwuyum

TI__Expert 5640 points

Thank you for proposal. I have checked this device, it is not TTL compatible.

Regards

John

0 Michael Ikwuyum 4 months ago in reply to John11513

TI__Mastermind 37625 points

Hi John,

Would it be feasible to use LXC to shift 5 V CMOS levels and any buffer running with overvoltage-tolerant inputs with TTL compatible or a device such as SN74LV8T245?

Best Regards,

Michael.

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SN74LVCC3245A: 5V TTL to 3.3V CMOS Bidirectional voltage translator