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SN74LV541A: About VOH

Ryoma Ohashi
Expert 5045 points
Part Number: SN74LV541A
Other Parts Discussed in Thread: , SN74AHCT541

Hi team,

My customer is currently using SN74LVCC4245APW but considering to move on to SN74LV541APW SN74ABT541PW for cost reduction. Could you kindly answer to the question from the customer?

[use case 1]

input: 5V

output 3.3V

Vcc=3.3V

[use case 2]

inout 3.3V

output 5V

Vcc=5V

Q: In the datasheet for SN74ABT541, it says that VOH=3V(min) (when Vcc=5V). Does this means that the output voltage varies from 3V~5.5V (This seems to be a bit wide range.)

The resciever can't handle 3V(min), so wondering if there is a situation of VOH=3V when Vcc is 5V.

Regards,

Ohashi

  • +1
    Guru 316690 points

    The SN74LV541A is not a level shifter; you cannot use it to convert from 3.3 V to 5 V.

    The SN74ABT541 is designed to have TTL-compatible inputs and outputs, and the high-level voltage of TTL signals is near 3.4 V.

    To be able to convert from 3.3 V to 5 V, you need a device with TTL-compatible inputs (but not outputs). To be able to convert from 5 V to 3.3 V, you need a device with overvoltage-tolerant inputs. Both features are supported by the SN74AHCT541 and SN74LV541AT.