Free download transistor as a switch9/26/2023 This figure, from the TI app note, " Selecting the Right Level-Translation Solution", shows that the specified input, output, and threshold levels are the same for 5 V and 3.3 V TTL circuits: To be absolutely sure, check the minimum V ih of your 5 V TTL device and make sure this number is less than the minimum V oh of your 3.3 V device. Therefore no conversion circuit is needed to drive a 5 V TTL input with a 3.3 V logic signal. The input is digital at 3.3V and should output 5V TTL levels.įor this situation you very likely do not need any conversion circuit at all.īoth 3.3 V and 5 V TTL logic switch with a threshold of about 0.8 V.
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