convert 3V V.24 to 5V TTL

Das verstehe ich nicht (siehe Betreff)! Sind es nicht insgesamt 24 V bei V.24?

Lars

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.

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

1. If you need 5V then use any 74xx that is usable as inverter or buffer (for example, Inverters, AND or OR gates).

Gruß, Arne

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

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.

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

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).