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.
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.
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file: /Techref/logic/levelconversion.htm,
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