SN74LV541AT: SN74LV541ATRGYR 4.5V - 5.5V vs SN74LV541ARGYR 3.3V CMOS Version

Ray Vincent Aranzaso

Part Number: SN74LV541AT
Other Parts Discussed in Thread: SN74LV541A, SN74LV1T126

Hi,

Good Day.

For the subject part, the customer is looking for performance data related to the lower-than-spec supply voltage. They have instances where they are using a 4.5V - 5.5V part in place of the 3.3V part. What conditions will cause the 4.5V - 5.5V part to fail in a 3.3v voltage circuit? They want to acknowledge that this is not a TI issue and would bare no responsibility/liability here. They do have products in the field with the 5V part instead of the 3.3V part. They want to understand under what conditions might this 4.5V - 5.5V part fail in the 3.3V circuit.

Please advise. Thank you very much.

Best Regards,

Ray Vincent

over 1 year ago

+1 Clemens Ladisch over 1 year ago

Guru 263990 points

At 3.3 V, the inputs should behave like the SN74LV1T126, and the outputs should behave like the SN74LV541A.

0 Ray Vincent Aranzaso over 1 year ago in reply to Clemens Ladisch

TI__Genius 14685 points

Hi Clemens,

Good Day. Their concern is with using the SW74LV541ATRGYR 4.5V - 5.5V in place of the SW74LV541ARGYR 3.3v CMOS version in a 3.3V voltage circuit and what conditions could cause the 4.5V part to fail. Can you be more specific about the parts they have listed here? The range of the 3.3V circuit using the 3.3V part is 2V to 5V so with a 4.5V part in its place what are the failure conditions?

Best Regards,

Ray Vincent

0 Emrys Maier over 1 year ago in reply to Ray Vincent Aranzaso

TI__Guru* 96681 points

Hi Ray,

Clemens is correct, but does not work for TI.

The official answer is that we only support operation within the datasheet recommended range. We only have data for the datasheet provided operating range, and that data is summarized in the datasheet.

0 Ray Vincent Aranzaso over 1 year ago in reply to Emrys Maier

TI__Genius 14685 points

Hi Emrys,

Good Day.

Can you provide any data/info as to what power bus voltage level threshold the output switches to the tri-state mode?

When the voltage power bus dips too low on the SW74LV541ATRGYR 4.5-5.5V device will the output go to the tri-state mode when powered at 3.3V instead of 5V?

Best Regards,

Ray Vincent

0 Clemens Ladisch over 1 year ago in reply to Ray Vincent Aranzaso

Guru 263990 points

No; below the minimum supply of 4.5 V, there are no guarantees. The outputs go Hi-Z only when /OE is low.

As I said in my first answer, the behaviour at 3.3 V is like that of LV1T/LV-A devices (but it is not guaranteed).

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SN74LV541AT: SN74LV541ATRGYR 4.5V - 5.5V vs SN74LV541ARGYR 3.3V CMOS Version