How can I convert a signal that has 0V level for a logical 0 and max
3.3V for a logical 1 into a regular TTL signal that has a maximum signal of 5V.- gepostetes
vor 20 Jahren
convert 3V V.24 to 5V TTL
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- gepostetes
vor 20 Jahren
Das verstehe ich nicht (siehe Betreff)! Sind es nicht insgesamt 24 V bei V.24?
Lars
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vor 20 Jahren
Raino schrieb im Beitrag ...
Use a wire. Wrong newsgroup ? de.sci.electronics is in german. Wrong understanding ? TLL is 'LO below 0.8V, HI above 2.1V', so 0V/3.3V is a perfect TTL signal. There is no need to use the maximum. A maximun is just that: A maximum.
-- Manfred Winterhoff, reply-to invalid, use mawin at despammed.com homepage: http://www.geocities.com/mwinterhoff/ de.sci.electronics FAQ: http://dse-faq.elektronik-kompendium.de/ Read 'Art of Electronics' Horowitz/Hill before you ask. Lese 'Hohe Schule der Elektronik 1+2' bevor du fragst.
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vor 20 Jahren
The signal is already TTL compatible - TTL specifications say that any signal between 2V and 5V (IIRC) is logical 1 and below 0,8V is logical
- If you need 5V then use any 74xx that is usable as inverter or buffer (for example, Inverters, AND or OR gates).
Gruß, Arne
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vor 20 Jahren
Raino schrieb:
As MaWin wrote: 0V / 3V3 is a perfect TTL signal. If you need 5V CMOS levels, then use any 74HCTxx circuit, e.g. 74hct08, which is supplied with 5V and accepts TTL levels.
Martin
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vor 20 Jahren
Want you to connect a rs232 signal to a microcontroller?
Then use a chip like max232cpe. This is a inverting driver, but most UARTS use such a device.
-- MFG Gernot
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vor 20 Jahren
And if anything should be in 3.3V then use the MAX3232 which can be driven with 3.xV and is als 3.3V compliant.
regards
-- Ulrich Prinz ---------------------------------------------------- "But befor you connect, be advised: you are plugging into the supply from hell." Datasheet LTC1625, Automotive Considerations, Linear Tech.
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vor 20 Jahren
Feed it into a 74(V)HCT gate with 5V supply. Note however that 3.3V is already "regular TTL", so no voltage translation is required unless you really want the signal to swing to 5V (for other reasons).