| ??? 01/13/05 14:21 Read: times |
#84937 - 3.3 Volts logic with 5V input ? Responding to: ???'s previous message |
Sorry Mikkel.
5V TTL system Do you know some TTL logic with different voltage ? If it's TTL it's 5V. Sorry. If you have a 3.3V system it's NOT a TTL compatible system, currents are differents, fan-outs are differents, a lot of parameters are differents, and the most important...Logic Levels are differents !!!. But if you like to connect an 3.3 V system input to a TTL output with some kind of adapter, like R plus zener, or R plus Transistor, or some like this ......you are using a "home-build" level converter. If you have a 3.3V system with 5V compatible inputs Sorry again I never saw...a 8051 derivative with 3.3 Vdd and compatible 5V inputs. Regards. Alberto. |
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