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Logic Level Conversion

3.3 to/from 5 volts

When the "Low side" (3.3 volt device) is high, mosfet off, "High side" (5 volt device) is at 5 votls via R2. When low, mosfet on, grounding high side. When 5 volt device drives "High side" to 5 volts, mosfet source pulled up to 3.3 volts for low side. When low, mosfet is activated via substrate diode, grounding low side.

TTL - RS232 conversion

NEW! RLC-2 RS232 Level Converter in a DB9 backshell

Logic Family Interoperability

The Art of Electronics (Horowitz & Hill, Cambridge University Press, ISBN 0-521-37095-7) On page 574 is a nice little table that lists what you can drive with what.

From       To-> TTL HCT/ACT HC/AC 4000B/74C@5v
TTL OK OK 1 1
HCT/ACT OK OK OK OK
HC/AC OK OK OK OK
4000B/74C@5v OK* OK OK OK

1 pullup to +5V, or use HCT as interface.

Archive:

See also:

file: /Techref/logic/levelconversion.htm, 2KB, , updated: 2020/2/29 20:19, local time: 2024/12/3 23:53,
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