3.3 to 5v again — ZXNet «hardware.zx»

From Maxim Kurdyukov To All 30 January 2006

Hello, All People, please help. It is necessary to coordinate 3.3V CMOS and 5V TTL logic. Does anyone know this type of chip? (level shifter in my opinion), which IS in PROMELEKTRONIK. We just have more There is nowhere to buy imported MS. Or, as a last resort, How can I replace it with transistors? :(

From Kirill Frolov To All 30 January 2006

Hello, TheNewDeveloper The> It is necessary to coordinate 3.3V CMOS and 5V TTL logic. Who knows the chip The> of this type (level shifter in my opinion), which IS in The> PROMEELECTRONICS. We simply have nowhere else to buy imported MS. Or, The> as a last resort The> how to replace it with transistors or something They can be replaced, most often with wires. It is in the combination of 3.3 CMOS vs. 5th century TTL. As a last resort - resistors.

From lvd To All 30 January 2006

Hello, CHRV CHR> Well, first of all, you need to read the doc and if the outputs are 5v tolerant, then CHR> it is enough to pull them up to 5V through a resistor. If this is purely logic then CHR> for the transition, use an open collector with a pull-up to 5V. If the 3.3V outputs work on 5V TTL inputs (ACT and HCT, ALS, LS, NO NOT AC,HC), then nothing needs to be done. Smoke TTL switching thresholds. =)

From Igor Afonkin To All 30 January 2006

Hello, lvd lvd> If 3.3V outputs work on 5V TTL inputs (ACT and HCT, ALS, LS, NO HE lvd> AC,HC), then you don’t need to do anything. Smoke TTL switching thresholds. =) may be, may be... although it works fine for me on HC... frequency <1MHz should roll... although...

From Chunin Roman To All 30 January 2006

Hello, TheNewDeveloper The> People, please help. The> It is necessary to coordinate 3.3V CMOS and 5V TTL logic. Who knows the chip The> of this type (level shifter in my opinion), which IS in The> PROMEELECTRONICS. We simply have nowhere else to buy imported MS. Or, The> as a last resort The> how to replace it with transistors or something :( Well, first of all, you need to read the doc and if the outputs are 5v tolerant, then it’s enough pull them up to 5V through a resistor. If this is purely logic then for the transition use an open collector with a pull-up to 5V.

From lvd To All 31 January 2006

Hello jdigreze jdi> may be, may be... jdi> Not mabye, but absolutely accurate. > although it works fine for me on HC... frequency <1MHz should be > roll... although... The threshold for HC and AC is from 1/3Vcc to 2/3Vcc. To do this in a series is to put a rake to users.