SN74LXCH8T245: If 23pin Could Left Floating

Yazhu Liu

Intellectual 1410 points

Part Number: SN74LXCH8T245
Other Parts Discussed in Thread: SN74LVC245A, SN74LXC8T245-Q1

Hi Team,

May I ask if the 23pin of SN74LXCH8T245 could be left floating？ If pin 23 and 24 connected inside the chip？

Thanks.

Best Regards,

Livia

over 4 years ago

0 Clemens Ladisch over 4 years ago

Guru 316780 points

Pins 23 and 24 are internally connected. (The pinout is designed this way to make the footprint compatible with non-translating transceivers like the SN74LVC245A.)

However, the device is probably not designed for or tested with one supply pin left floating, so correct operation is not guaranteed.

0 Yazhu Liu over 4 years ago in reply to Clemens Ladisch

TI__Intellectual 1410 points

Hi Clemens,

Customer is searching for the replacement of 74LVXC3245, but need the operation temperature range to be larger than 105℃, do you have any suggestion here?

Thanks.

Best Regards,

Livia

0 Clemens Ladisch over 4 years ago in reply to Yazhu Liu

Guru 316780 points

There is no other reasonable choice.

The device will probably work without pin 23, but as I said, there is no guarantee.

0 Chad Crosby over 4 years ago

TI__Expert 6680 points

Hi Livia,

This device should still function if pin 23 is left floating, but it's still recommended to connect this to your supply for the best performance. If you're looking for a higher temp rating, try the SN74LXC8T245-Q1, which is rated up to 125C

Thanks!

Chad Crosby

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SN74LXCH8T245: If 23pin Could Left Floating