CMOS And TTL: A Level Shifting Cautionary Tale Comparison of TTL and CMOS logic thresholds with comparison to 3.3V output. NXP application note 240 (PDF). When directly driving logic you’d ...

Power +5V center pin positive or via pinheader (verify polarity before connecting) 2.54 mm jumpers to enable/disable /1OE (first ...

The processor has a TTL level for inputs, and from DS the LSF0108 turns off the FET at 3.3V -0.5V =2.8V (Vref_A - 0.5V ...

My customer looks for LVTTL to TTL level shifter (greater than 4bit is preferable). For now, I'm promoting SN74LVCC3245A.

This level shifter board combines the ... this works as well for TTL Serial, slow <2MHz SPI, and any other digital interface ...

The chip’s address and data buses connect to a Pi’s GPIO header, and the only other thing to note is a 74LS541 TTL level shifter that converts the Pi’s 3.3V output to the PROM’s 5V TTL level.

Figure 1 illustrates the use of a digital transistor acting as a logic-level shifter from LV-TTL to ~1V logic. Figure 1.